아무것도 놓치고 싶지 않으신가요?

인증 시험 합격 팁

최신 시험 소식 및 할인 정보

전문가가 선별하고 최신 정보를 제공합니다.

예, 뉴스레터를 보내주세요

다른 면접 문제 보기
1
참고 답변
I start by defining the problem clearly. When someone says the network is slow, I ask questions. Is it slow for everyone or just certain users? All the time or only during certain hours? Which applications? Once I understand the symptoms, I check monitoring tools for bandwidth utilization, latency, packet loss, and device CPU usage. Often the data points directly to the bottleneck. From there I narrow the scope. Is this Layer 1, Layer 2, Layer 3, or actually an application issue that just looks like a network problem? I document as I go, both to avoid duplicating effort and to create records for post-incident review.
2
참고 답변
Network engineers must ensure that network performance is running optimally without issues despite bottlenecks and threats of decreased performance. Potential employers want to know that you have the skills to identify these common issues and can act quickly to reduce any downtime. This question gives you a chance to talk about your previous work optimizing router protocols and implementing delivery solutions to fix system bottlenecks.
커리어 가속

자격증을 취득하여 이력서를 돋보이게 하세요.

데이터 분석에 따르면 IT 자격증 보유자의 연봉은 평균 구직자보다 26% 높습니다. SPOTO에서 자격증 취득과 면접 준비를 동시에 진행하여 경력 성장을 가속할 수 있습니다.

1 100% 합격률
2 2주간 덤프 연습
3 자격증 시험 합격
전 세계적으로 인정 100만+ 자격증 취득 일하면서 학습
학습 계획 만들기
3
참고 답변
Random access preambles are used by UEs to initiate random access, identifying themselves to the eNodeB.
4
참고 답변
Intra-frequency handover occurs between cells on the same frequency.
5
참고 답변
The paging cycle controls how often the UE wakes up for paging.
6
참고 답변
Cell interference is managed via ICIC, power control, and frequency planning.
7
참고 답변
Uplink power control adjusts UE power for PUSCH, PUCCH, and SRS to optimize performance.
8
참고 답변
Adaptive HARQ changes MCS and resources per retransmission, while non-adaptive uses fixed parameters.
9
참고 답변
A Virtual Private Network (VPN) establishes a protected, encrypted link over the inherently less secure internet. This encrypted pathway ensures that users can send data across the internet privately and securely, as though their devices were directly connected to a private network. Below is a detailed breakdown of the process: - Starting the Connection: Activating the VPN software initiates communication to the VPN server via your internet connection, encrypting the request to connect right from the start. - Verifying User Identity: Next, the VPN server checks your login details, like your username and password, to authenticate your access. This step confirms that only verified users can use the VPN service. - Establishing the Secure Channel: Following successful authentication, an encrypted, secure link is formed between your device and the VPN server. This encrypted link acts as a private conduit, ensuring that any data passing through it remains secure. - Securing Data Transmission: The data you send to the VPN server travels securely within this encrypted channel, shielding it from external threats or surveillance. This layer of encryption keeps your information safe from potential cyber threats, including those from hackers, Internet Service Providers (ISP), and government entities. - Reaching the Destination: Upon arriving at the VPN server, your data is decrypted and then forwarded to its final online destination. As the data seems to originate from the VPN server rather than your personal device, it effectively masks your actual IP address and location, thereby preserving your online anonymity. - Receiving Data: When you request data from the internet, like accessing a website, it is first sent to the VPN server. Here, it's encrypted once more and transmitted back through the secure tunnel to your device. Upon arrival, your VPN client decrypts the information, making it accessible for normal use.
10
참고 답변
Bandwidth is the amount of data that can be transferred, while latency is the delay in data transmission.
11
참고 답변
This question allows you to dig into candidates' ability to innovate and use advanced techniques to solve complex challenges in network management. Additionally, by providing a specific example or theoretical application, the candidate can demonstrate their creativity and strategic thinking. Answer sample: In leveraging machine learning or AI technologies to enhance network performance and security, I would focus on developing predictive analytics models to anticipate and prevent potential network issues before they occur. For example, by analyzing historical network data and patterns using machine learning algorithms, we can identify anomalies or deviations from normal behavior that may indicate security threats or performance degradation. These insights enable proactive interventions, such as automated traffic rerouting or security policy adjustments, to mitigate risks and optimize network efficiency in real time. Additionally, AI-powered anomaly detection systems can continuously adapt and improve over time, enhancing our network's resilience against evolving threats and dynamic traffic patterns.
12
참고 답변
An EPS bearer is a logical connection between the UE and PDN Gateway, characterized by QoS parameters like QCI.
13
참고 답변
5G NR serves various applications categorised into enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC), and Ultra-Reliable Low Latency Communications (URLLC). eMBB caters to high-data-rate applications like augmented reality, mMTC facilitates connectivity for a massive number of devices, and URLLC ensures low-latency and highly reliable communication, crucial for applications like autonomous vehicles and industrial automation.
14
참고 답변
An LTE frame is 10 ms long, consisting of 10 subframes of 1 ms each, each with 2 slots of 0.5 ms.
15
참고 답변
Multicast routing is a form of broadcasting that sends a message to a selected group of recipients rather than transmitting it to all users on a subnet.
16
참고 답변
TCP is connection-oriented and guarantees delivery through acknowledgments and retransmissions. That makes it ideal for web browsing, email, and file transfers where data integrity matters. UDP is connectionless and just fires packets without waiting for confirmation. That sounds less reliable, but it is perfect for real-time applications like video streaming, gaming, or VoIP where speed matters more than perfect delivery. A few dropped packets in a video call are less disruptive than TCP handshaking delays. When troubleshooting, knowing which protocol an application uses helps me focus. VoIP quality issues mean I am looking at jitter and latency, not retransmission problems.
17
참고 답변
5G NR offers impressive range and speed characteristics, essential for diverse applications. 5G NR boasts an extended range, reaching up to 10 kilometres, coupled with remarkable speeds exceeding 10 Gbps. This ensures reliable connectivity in both urban and rural settings, while the high speeds support bandwidth-intensive applications, including high-definition video streaming and virtual reality.
18
참고 답변
T300 starts when the UE sends RRC Connection Request, waiting for response.
19
참고 답변
I regularly use Ping to check if a device is reachable and responding. Traceroute shows me the path packets take and where they might be getting stuck. If a user can't reach a server, those are my first checks. For more detailed packet analysis, I use Wireshark. I'll capture traffic to see exactly what's on the wire—what protocols are being used, if packets are malformed, that kind of thing. For interface-level troubleshooting, I use the CLI on routers and switches to check interface statistics—are errors occurring, is the interface actually up, what's the bandwidth utilization. I've also used packet capture built into switches or routers themselves, which is useful when I need to see what traffic is coming through a specific port. Most recently, I've been using NetFlow for traffic analysis—that gives me visibility into what's consuming bandwidth. Each tool answers a different question, so I pick the right tool based on what I'm trying to troubleshoot.
20
참고 답변
Understanding the candidate's experience in testing 5G networks and systems will provide an insight into their analytical abilities and problem-solving skills.
21
참고 답변
The different deployment models for 5G architecture include non-standalone (NSA) and standalone (SA) modes. NSA mode uses existing 4G LTE networks for certain functions, while SA mode is a completely independent 5G network.
22
참고 답변
We had a planned network upgrade scheduled for a weekend while simultaneously dealing with recurring connectivity issues on a client's WAN link. Both seemed urgent. I worked with my manager and the client to understand true impact. The connectivity issue was intermittent and affected a few dozen users; the upgrade would improve performance for thousands. We decided to delay the upgrade to focus on the WAN issue, diagnosed it (turned out to be a faulty ISP circuit), and then proceeded with the upgrade the following weekend. The key was communicating with stakeholders about what was actually urgent versus what just felt urgent.
23
참고 답변
I have experience using Python for network automation tasks such as configuration management, data collection, and report generation. I've also worked with tools like Ansible for orchestrating network changes across multiple devices.
24
참고 답변
Deploying 5G in rural areas faces challenges such as limited infrastructure, higher deployment costs, and the need for extensive coverage, especially in sparsely populated regions.
25
참고 답변
Event B2 triggers inter-RAT handover when serving becomes worse than threshold1 and neighbor becomes better than threshold2.
26
참고 답변
The High-Speed flag restricts cyclic shifts to avoid ambiguity in high-Doppler scenarios.
27
참고 답변
PDSCH carries user data, system information (SIBs), and paging messages.
28
참고 답변
I manage network device configurations and backups by using configuration management tools and automated backup solutions. This includes regularly backing up device configurations, maintaining version control, and storing backups in secure locations. Regular audits and updates ensure that configurations are up-to-date and can be quickly restored in case of device failures or configuration errors.
29
참고 답변
Synchronization aligns UE timing and frequency with the eNodeB for communication.
30
참고 답변
Short DRX uses a shorter cycle after inactivity, transitioning to long DRX if no data.
31
참고 답변
UE positioning uses OTDOA, A-GNSS, or cell ID based methods.
32
참고 답변
The User Datagram Protocol (UDP) serves a distinct and valuable purpose in network communications despite the possibility of directly embedding data into IP packets. One of the primary advantages of UDP over simply using the IP protocol is its introduction of port numbers, which facilitate the process of data demultiplexing to the correct application on the receiving end. This means that UDP allows multiple applications to run on a single device simultaneously, with each application being able to send and receive data through its unique port. Without UDP, managing communication between different applications over the network would be significantly more complex. Additionally, UDP adds minimal overhead to the data packets, providing a lightweight transport mechanism. This is particularly beneficial for applications that require fast, efficient delivery of data, such as streaming media, real-time online games, and voice-over IP (VoIP) services. These applications can tolerate some data loss but are highly sensitive to delays, making the relatively lower transmission latency and overhead of UDP preferable to the more robust error-handling and flow control mechanisms of TCP.
33
참고 답변
The target eNodeB assigns a dedicated preamble for fast access.
34
참고 답변
It affects RACH capacity and latency by defining resource allocation.
35
참고 답변
A physical layer frame is 10 ms long, consisting of 10 subframes.
36
참고 답변
5G QoS is based on QoS Flows identified by QFI (QoS Flow ID). Each flow has 5QI (5G QoS Identifier) with parameters like priority, packet delay budget, packet error rate, and guaranteed/non-guaranteed bit rate. Mapping to DRBs is handled by SDAP.
37
참고 답변
The RRC (Radio Resource Control) layer performs the following functions: - Broadcasts System Information (SI) messages to the Access Stratum (AS) and Non-Access Stratum (NAS). - Handles paging initiated by the 5G Core Network (5GC) or NG-RAN (Radio Access Network). - Establishes, maintains, and releases RRC Connections between the 5G NR UE and NG-RAN, including the addition, modification, and release of Carrier Aggregation (CA) and Dual Connectivity in NR or between E-UTRA and NR. - Manages security, including key management. - Establishes, configures, maintains, and releases Signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs). - Handles mobility functions such as handover, context transfer, UE cell selection/re-selection, control of cell selection/re-selection, and Inter-RAT mobility. - Manages QoS. - Handles UE measurement reporting and reporting control. - Detects and recovers from radio link failures. - Transfers NAS messages to/from the UE. The RRC layer has three states: - RRC_IDLE: The UE is not actively connected to the network. - RRC_INACTIVE: The UE is known to the network but is not actively transmitting or receiving data. This state allows for faster transition back to connected mode compared to RRC_IDLE. - RRC_CONNECTED: The UE is actively connected to the network and can transmit and receive data.
38
참고 답변
A hub refers to a point or joint where a connection occurs. It can be a computer or device that is part of a network. At least two hubs are needed to form a network connection.
39
참고 답변
The 5G NR frame structure consists of frames, subframes, and slots. The flexibility in slot duration and the introduction of mini-slots allow for dynamic adaptation to different service requirements.
40
참고 답변
Adjacent channel interference is caused by signals from neighboring frequency bands leaking into the desired channel.
41
참고 답변
LTE uses HARQ for fast retransmissions at the MAC layer and ARQ at the RLC layer for residual errors.
42
참고 답변
RACH is triggered for initial access, handover, or uplink synchronization loss.
43
참고 답변
5G NR introduces flexible numerology, scalable OFDM, and support for higher frequency bands (mmWave) compared to LTE. It also uses a more flexible subcarrier spacing (15, 30, 60, 120 kHz) and supports both FR1 (sub-6 GHz) and FR2 (mmWave) frequency ranges, whereas LTE is limited to fixed 15 kHz subcarrier spacing and lower frequency bands.
44
참고 답변
This is a role-specific question. The OSI (Open Systems Interconnection) reference model has seven layers: 1. Physical Layer – transmits raw bit streams over a physical medium. 2. Data Link Layer – provides node-to-node data transfer and error detection (e.g., Ethernet, PPP). 3. Network Layer – handles routing and forwarding (e.g., IP, ICMP). 4. Transport Layer – ensures reliable or unreliable delivery (e.g., TCP, UDP). 5. Session Layer – manages sessions and connections between applications. 6. Presentation Layer – translates data formats and handles encryption/compression. 7. Application Layer – provides network services to end-user applications (e.g., HTTP, FTP, SMTP).
45
참고 답변
The introduction of IPv6, despite the widespread use of Network Address Translation (NAT) with IPv4, addresses several key limitations and offers significant advantages that NAT cannot fully resolve. NAT was developed as a temporary solution to the exhaustion of IPv4 addresses, allowing multiple devices on a private network to share a single public IPv4 address. While NAT effectively extends the life of the IPv4 address space and provides a layer of privacy and security by hiding internal IP addresses, it introduces complexity and limitations in network configuration and communication. IPv6, on the other hand, offers a vastly expanded address space due to its 128-bit address size, compared to the 32-bit size of IPv4. This expansion virtually eliminates the need for NAT, allowing every device to have a unique global address.
46
참고 답변
PSS provides slot timing and physical layer identity.
47
참고 답변
IPv4 (Internet Protocol version 4) uses a 32-bit address format, allowing for approximately 4.3 billion unique addresses. IPv6 (Internet Protocol version 6) uses a 128-bit address format, providing a vastly larger address space. IPv6 also includes improvements such as simplified header structure, improved security features, and support for auto-configuration. IPv6 was developed to address the limitations of IPv4, including address exhaustion and the need for more efficient routing.
48
참고 답변
Short DRX provides faster response after inactivity before entering long DRX.
49
참고 답변
Restricted shifts prevent ambiguity due to larger propagation delays.
50
참고 답변
During a company-wide meeting, I explained the importance of network security to non-technical staff by using simple analogies, like comparing firewalls to locked doors. This approach helped everyone understand the critical role they play in maintaining our network's safety.
51
참고 답변
Network slicing is a key feature of 5G architecture that allows network operators to divide the network into virtualized slices, each with its own unique characteristics and capabilities. This allows operators to tailor the network to specific use cases and applications.
52
참고 답변
In a retail chain's HQ, our three-tier design used redundant 40 Gbit core switches, distribution for routing and ACLs, and PoE access for registers. During a firmware upgrade we isolated the access layer, keeping core services live. Such resilience is why three-tier questions surface in network engineer interview questions.
53
참고 답변
Security in NAS signaling ensures confidentiality and integrity of control messages between UE and MME, preventing eavesdropping and tampering.
54
참고 답변
Bearer binding associates a service data flow with an EPS bearer based on QoS.
55
참고 답변
The MIB is transmitted every 40 ms on PBCH.
56
참고 답변
Millimeter-wave antennas are used in 5G networks to transmit and receive signals at high frequencies, enabling higher data rates and increased capacity. These antennas are often deployed in small cells and require line-of-sight connections.
57
참고 답변
This question tests the candidate's adaptability, project management skills, and ability to find effective solutions under changing conditions.
58
참고 답변
Loops in Layer 2 networks are prevented using the Spanning Tree Protocol (STP) and its advanced versions. STP ensures a network remains loop-free by deactivating extra links, effectively preventing endless data frame circulation. Its derivatives, such as Rapid Spanning Tree Protocol (RSTP) and Multiple Spanning Tree Protocol (MSTP), offer quicker network recovery and the ability to handle multiple VLANs within a single loop-free topology, ensuring efficient and reliable network operation.
59
참고 답변
Operational Support Systems (OSS) play a vital role in managing and maintaining 5G networks. Network slicing impacts 5G OSS by introducing new complexities in resource management, service orchestration, and monitoring. OSS systems need to adapt to the dynamic nature of Network slicing to ensure efficient operations and deliver a seamless user experience.
60
참고 답변
âAnonymous FTP provides a method for granting users access to files on public servers. Those permitted to access data from these servers can do so without the need for personal identification, but instead theyâll log in as anonymous guests.â
61
참고 답변
Downlink HARQ uses asynchronous adaptive processes with feedback on PUCCH.
62
참고 답변
CCEs are the basic units for PDCCH transmission, used to map DCI messages to physical resources.
63
참고 답변
Our CFO wanted to understand why we needed to spend $50,000 on a network upgrade. He didn't care about technical specs, so I used an analogy. I told him the current network was like a two-lane highway during rush hour—it works fine until demand spikes, and then everything backs up. The upgrade would be adding lanes and better traffic management. I showed him metrics: during peak hours, our link utilization was hitting 95%, which was causing slowdowns for financial reporting applications. I explained that these slowdowns were costing the company money because people were waiting. Then I showed him that the new equipment would cost $50,000 but would support our growth for the next three years without performance degradation. That business language—cost, impact, and timeline—resonated with him. He approved the budget. The lesson I learned is that technical people want to talk about throughput and latency, but business people want to know about impact and cost. Now I always translate technical issues into business terms.
64
참고 답변
Given a /24, I can carve out four /26 subnets, each with 62 hosts. I used that for separating IoT, staff, guests, and management networks in a stadium. Presenting real scenarios shows practical command, ticking a big checkbox in network engineer interview questions.
65
참고 답변
Incremental redundancy sends different coded bits in retransmissions, providing additional coding gain.
66
참고 답변
5G air interface technologies, such as shorter transmission time intervals (TTIs) and improved protocol efficiency, help reduce latency and enable real-time applications with stringent latency requirements.
67
참고 답변
RBs are the basic unit for resource allocation in frequency domain.
68
참고 답변
Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) monitor network traffic for suspicious activity. IDS identifies and alerts administrators to potential threats, while IPS takes immediate action to block or mitigate these threats.
69
참고 답변
A Scheduling Request is sent by the UE on PUCCH to request uplink resources for data transmission.
70
참고 답변
UE ON procedure includes power-up, cell search, system info acquisition, and attach.
71
참고 답변
Paging groups are based on UE ID to determine paging occasions.
72
참고 답변
NIC stands for Network Interface Card, also called an Ethernet card or a network adapter. This is a hardware component that is essential for connecting the computer to a network. NIC is a card that is installed in a system for connecting to the internet. This is important for wireless, wired and LAN communication. It has a unique MAC address that will help in identifying the computer within a network.
73
참고 답변
The short DRX cycle is a shorter cycle used after inactivity, transitioning to long DRX.
74
참고 답변
Contention-based uses shared preambles with collision risk; contention-free uses dedicated preambles.
75
참고 답변
LTE provides downlink peak rates of at least 100Mbit/s, 50 Mbit/s in the uplink and RAN (Radio Access Network) round-trip times of less than 10 ms.
76
참고 답변
Implementing and managing ACLs involves defining rules that control network traffic based on IP addresses, protocols, or ports. For this, network engineers need to: Determine the security policies and requirements; Create ACL entries specifying permitted or denied traffic types; Apply these ACLs to network interfaces or devices to enforce the rules; Regularly review and update ACLs to adapt to changing security needs and ensure they are not overly restrictive or permissive. Proper documentation and testing are essential to ensure ACLs function as intended without disrupting legitimate network traffic.
77
참고 답변
HARQ combines forward error correction with retransmissions to recover lost or erroneous packets, reducing packet loss.
78
참고 답변
5G TDD frame structure uses a single frequency band with time-division duplexing, where slots are allocated for DL, UL, and flexible symbols. FDD frame structure uses paired bands for simultaneous DL and UL. Both use 10 ms frames with flexible slot configurations based on numerology.
79
참고 답변
The internet is a global network that connects thousands of computers. Information can be accessed and shared from any location that has access to the internet. An intranet is a network that is unique to a firm where data is accessed and shared among the computers within that network only. An extranet is a network where only specific members are allowed access. These may include vendors, customers, suppliers, and other officials who are associated with a company. The extranet handles the secure part of the website that is accessed through IDs and passwords.
80
참고 답변
Handovers are crucial for seamless mobility in 5G networks. The three main handover types are intra-NR, inter-NR, and Xn-based handovers. Here's a detailed explanation: a) Intra-NR handovers: Occur within the 5G network, maintaining the connection as the user moves within the coverage area. b) Inter-NR handovers: Involve transitioning between 5G networks, ensuring uninterrupted service. c) Xn-based handovers: Utilise the Xn interface for handovers between cells served by different gNBs, enhancing efficiency and reliability.
81
참고 답변
KPIs are crucial metrics for assessing the performance of 5G networks. In 5G NR, they encompass metrics like latency, reliability, throughput, and coverage. These indicators help operators gauge the Network's efficiency and make informed decisions to optimise and enhance the user experience.
82
참고 답변
- MIB (Master Information Block): Contains essential system information transmitted on the xBCH transport channel and xBCCH logical channel. - SIB (System Information Block): Contains RRC (Radio Resource Configuration) information that is common for all UEs. It's transmitted on the xBCCH logical channel and xBCH transport channel. The IE (Information Element) XSystemInformationBlock is part of the SIB.
83
참고 답변
The UE wakes up during the on-duration or for paging occasions.
84
참고 답변
I handle IP address allocation and management by using DHCP (Dynamic Host Configuration Protocol) to automate the assignment of IP addresses within the network. For static IP addresses, I maintain a detailed IP address plan and document all allocations to ensure there are no conflicts. Additionally, I regularly review and update the IP address plan to accommodate network changes and expansions.
85
참고 답변
Extended PHR reports power headroom for multiple carriers in carrier aggregation.
86
참고 답변
Each UE uses a unique dedicated preamble assigned by the network.
87
참고 답변
Faster download and upload speeds, lower latency, greater capacity, and supports new use cases like autonomous vehicles, remote surgery, and virtual and augmented reality.
88
참고 답변
the gNB logical architecture consists of a central unit (CU) and distributed unit (DU), i.e., gNB=CU+DU. The CU controls the functioning of the DUs over the front-haul interface. It is LTE Equivalent enhanced NodeB (eNB). The NR gNB supports connectivity to 5GC, and provides 5G-CP and 5G-UP protocol terminations towards the UE.
89
참고 답변
Effective network planning is fundamental to achieving optimal performance in 5G networks. It involves strategic placement of gNBs, careful consideration of radio frequency planning, and capacity planning to meet the specific requirements of diverse applications. Thorough planning is essential for ensuring seamless connectivity, high performance, and user satisfaction.
90
참고 답변
DRX cycle offset shifts the start of the DRX cycle to distribute wake-up times.
91
참고 답변
PRACH is used for initial access, handover, and uplink synchronization by transmitting random access preambles.
92
참고 답변
I have experience with SDN (Software-Defined Networking) technologies such as OpenFlow, Cisco ACI, and VMware NSX. SDN separates the control plane from the data plane, allowing for centralized management and dynamic configuration of network resources. This enhances network agility, simplifies management, and improves scalability and automation.
93
참고 답변
I primarily use SolarWinds and Nagios for network monitoring and management. These tools allow me to proactively identify and resolve issues, ensuring optimal network performance and security.
94
참고 답변
The main function of the LTE physical layer is to provide data transport services, including modulation, coding, multiple antenna processing, and mapping to the physical transmission medium.
95
참고 답변
Load balancing is a technique used to distribute network traffic across multiple servers or network paths to ensure optimal resource utilization and avoid overloading any single component. It is implemented using load balancers, which can be hardware devices or software solutions. Load balancers monitor the health and performance of servers and dynamically distribute traffic based on predefined algorithms, such as round-robin, least connections, or least response time.
96
참고 답변
SRS is used for uplink channel sounding to estimate channel quality and support frequency-selective scheduling.
97
참고 답변
FTP stands for file transfer protocol. This is used by the TCP/IP model for transferring files from a host system to another host system. It is used for downloading files from the server to a computer and transferring web pages very efficiently. Anonymous FTP is a method of providing access to certain public servers. Users who have been granted access to these servers do not need identification, instead, they can just log in as guests.
98
참고 답변
A default bearer is established during initial attach and provides always-on IP connectivity with non-GBR QoS.
99
참고 답변
I'm familiar with tools like SolarWinds, PRTG, and Nagios. Key features include network monitoring, performance analysis, traffic flow analysis, and alerting systems.
100
참고 답변
Network automation is a crucial feature of 5G OSS, streamlining operations and enhancing efficiency. 5G OSS facilitates network automation by leveraging Artificial Intelligence, Machine Learning, and advanced analytics. Automation in OSS expedites routine tasks, optimises resource allocation, and proactively addresses issues, ensuring a responsive and agile network infrastructure.
101
참고 답변
When troubleshooting 5G network problems, I typically start by gathering as much information as possible about the issue and the environment in which it occurs. I then use that information to identify the root cause and develop a plan to resolve the issue. This usually involves troubleshooting the hardware, software, and network configuration of the 5G network. I also use various network monitoring and analysis tools to identify and debug network-related problems.
102
참고 답변
Subnetting involves segmenting a larger network into several smaller, logical networks, known as subnets, to enhance the manageability and security of the network. Its primary goals include boosting network performance through the minimization of congestion, increasing security by segregating clusters of devices and enhancing the allocation efficiency of IP addresses to prevent their squandering. This process requires adjusting the network's subnet mask, which defines the dimensions of each subnet.
103
참고 답변
Massive MIMO (Multiple-Input Multiple-Output) is a technology that uses a large number of antennas at the base station to transmit and receive multiple data streams simultaneously. It improves spectral efficiency, network capacity, and overall performance in 5G networks.
104
참고 답변
The air interface in 5G supports network virtualization by providing virtualized radio resources and enabling the dynamic creation and management of network slices with different service characteristics.
105
참고 답변
Option 3 uses LTE eNB as master node with 5G NR as secondary node, with user plane split at eNB. Option 3a has user plane split at core (SGW), with NR directly connected to core. Option 3x combines both, with user plane split at eNB for some bearers and at core for others, optimizing traffic flow.
106
참고 답변
Cloud computing plays a vital role in 5G by providing scalable computing resources, enabling edge computing capabilities, and facilitating the deployment of virtualized network functions, resulting in improved performance and service delivery.
107
참고 답변
PRACH is used by UEs to initiate random access for initial connection, handover, or uplink synchronization.
108
참고 답변
To construct your answer, do some research into the salary brackets of a network engineer, taking into account the following: Your level of experience, What youâre currently earning, Your location, Whether the role is a contract or permanent position, If the role is onsite, remote or a combination of both, Other offers youâve recently had, What other companies are offering, The size of the organisation and what you could realistically expect them to offer you. Hereâs how you could answer: âBased on my level of experience as a network engineer and research I have conducted around the position youâre offering, I would be grateful for you to offer me âXâ for this position.â
109
참고 답변
Channel bandwidth refers to the amount of frequency spectrum allocated to an individual channel within a cell, while cell bandwidth represents the aggregate bandwidth available for all channels within a cell. Cell bandwidth encompasses multiple channels and is typically wider than individual channel bandwidth.
110
참고 답변
The Paging Channel carries paging messages to notify idle UEs of incoming calls or data.
111
참고 답변
This question seeks to evaluate the candidate's prior involvement in 5G networks' design and development, thereby presenting their capabilities and understanding of 5G technologies.
112
참고 답변
In NSA deployments, the 5G radio access network connects to the existing 4G core network, while in SA deployments, both the radio access network and the core network are built specifically for 5G.
113
참고 답변
MTCH (Multicast Traffic Channel) carries multicast data, while DTCH (Dedicated Traffic Channel) carries unicast user data.
114
참고 답변
The target eNodeB assigns a dedicated preamble via the source eNodeB during handover preparation.
115
참고 답변
5G achieves higher data rates through the use of advanced technologies like wider bandwidths, more efficient modulation schemes, massive MIMO, and beamforming.
116
참고 답변
MIB provides bandwidth and PHICH info for further system information decoding.
117
참고 답변
3GPP network sharing architecture allows different core network operators to connect to a shared radio access network. The operators do not only share the radio network elements, but may also share the radio resources themselves.
118
참고 답변
The Control Plane manages signaling for connection setup, mobility, and security, ensuring network control.
119
참고 답변
DRX increases latency due to sleep periods, but shorter cycles reduce the impact.
120
참고 답변
Special subframes in TDD provide a guard period for switching between downlink and uplink, containing DwPTS, GP, and UpPTS.
121
참고 답변
The short DRX cycle is a temporary cycle after inactivity, followed by long DRX.
122
참고 답변
I'd start by understanding the company's needs: how many locations, how much traffic needs to move between them, and what the budget is. For a multi-location design, I'd typically implement a hub-and-spoke topology with the main data center as the hub and each location as a spoke. This simplifies management and routing. For connectivity, I'd probably use MPLS or SD-WAN depending on budget and complexity—SD-WAN is becoming more popular because it's easier to manage and can use cheaper internet links. Locally at each location, I'd ensure redundancy with dual switches and probably dual links back to the main site so we're not dependent on a single connection. I'd use a dynamic routing protocol like OSPF to advertise routes and handle failover automatically. I'd also think about DNS and DHCP—do we centralize those or have them at each location? For security, each location would have a local firewall appliance or connect back through a central security gateway. One project I did was connecting five office locations with MPLS circuits from the ISP. We achieved about 99.5% uptime because when one link had issues, the traffic automatically rerouted through the others.
123
참고 답변
Dedicated preambles are assigned for contention-free RACH during handover.
124
참고 답변
This question focuses on understanding how candidates deal with diagnosing and resolving complex network issues in a timely and efficient manner. Answer sample: When faced with intermittent network issues that lack an immediate clear root cause, my approach begins with gathering as much information as possible to understand the scope and nature of the problem. This typically involves analyzing network logs, conducting packet captures, and utilizing network monitoring tools to identify patterns or anomalies in network traffic. Once I have a comprehensive dataset, I systematically analyze potential causes, considering factors such as network configuration changes, hardware failures, software bugs, or environmental factors like electromagnetic interference. To document and track these issues, I maintain detailed incident reports that outline the steps taken during the diagnosis process, including any observations, findings, and actions taken to address the problem. This documentation serves as a valuable reference for tracking progress, sharing insights with team members, and providing updates to stakeholders. Throughout the diagnostic process, I prioritize communication and collaboration, consulting with colleagues, vendors, and other subject matter experts as needed to validate hypotheses and explore potential solutions. In cases where the root cause remains elusive, I adopt a systematic and methodical approach, leveraging diagnostic tools and techniques to narrow down possibilities and eliminate potential causes one by one. This may involve implementing temporary fixes or workarounds to mitigate the impact of the issue while continuing to investigate and troubleshoot.
125
참고 답변
Tunnels create a virtual passage for data exchange between two communicating computers without using IPsec themselves. The gateway connecting their LANs to the transit network creates a virtual tunnel and uses the IPsec protocol to secure all communication passing through it.
126
참고 답변
EPC includes MME, S-GW, P-GW, and HSS, providing mobility, session management, and connectivity to external networks.
127
참고 답변
Paging frame selection uses UE ID and DRX cycle to compute the SFN.
128
참고 답변
A guard period is a time interval used in TDD to switch between uplink and downlink, preventing interference.
129
참고 답변
Carrier aggregation combines multiple LTE carriers to increase bandwidth and data rates.
130
참고 답변
Millimeter-wave frequencies offer high data rates in 5G, but they face challenges like limited coverage, susceptibility to interference, and higher signal attenuation. However, they also open up opportunities for new applications and use cases, particularly in dense urban environments.
131
참고 답변
BCCH is a logical channel that broadcasts system information to all UEs in a cell.
132
참고 답변
The management plane encompasses functions and protocols related to network management, including configuration, performance monitoring, fault management, and security management.
133
참고 답변
Subnetting is the process of dividing a larger IP network into smaller, more manageable sub-networks (subnets). This helps improve network performance and security. To calculate subnets, you determine the number of bits needed for the subnet mask to achieve the desired number of subnets and hosts per subnet. For example, to create four subnets from a Class C network (192.168.1.0/24), you would use a subnet mask of 255.255.255.192 (/26), which provides four subnets with 62 hosts each.
134
참고 답변
The MIB provides essential system information like bandwidth, PHICH config, and SFN.
135
참고 답변
Hereâs how you could respond: "With my experience as a network engineer, managing multiple projects has become second nature to me. I rely on a project management programme to ensure my workload and various projects are completed on time and within budget. I take this approach as it allows me to keep on top of all my deadlines and meet the needs of the business and end users' needs."
136
참고 답변
SSID (Service Set Identifier) is the unique name assigned to a Wi-Fi network, distinguishing it from other networks in the area. It enables users to identify and connect to the correct network, ensuring secure and organized access. Properly naming SSIDs helps manage multiple networks, prevents unauthorized access, and can be used to communicate network information, such as usage policies or ownership.
137
참고 답변
ACLs (Access Control Lists) are used to define rules that control the flow of traffic in a network. They specify which packets are allowed or denied based on criteria such as source and destination IP addresses, ports, and protocols. ACLs are implemented on routers, switches, and firewalls to enhance network security, manage traffic, and enforce policies.
138
참고 답변
5G NR BWP (Bandwidth Part) types include Initial BWP (for initial access), Default BWP (for fallback), and Dedicated BWP (for active UE). BWP operations include activation, deactivation, switching via RRC or DCI, and bandwidth adaptation for power saving.
139
참고 답변
ADVANTAGE: - It makes an OFDM signal insensitive to time dispersion as long as the span of the time dispersion does not exceed the length of the cyclic prefix. - As a repetition of the end of the symbol, it allows the linear convolution of a frequency-selective multipath channel to be modelled as circular convolution, which in turn may be transformed to the frequency domain using a discrete Fourier transform. This approach allows for simple frequency-domain processing, such as channel estimation and equalization. DISADVANTAGE: - Only a fraction Tu /(Tu+TCP) of the received signal power is actually utilized by the OFDM demodulator, implying a corresponding power loss in the demodulation. - CP insertion also implies a corresponding loss in terms of bandwidth as the OFDM symbol rate is reduced without a corresponding reduction in the overall signal bandwidth.
140
참고 답변
CQI (Channel Quality Indicator) reports downlink channel quality, enabling adaptive modulation and coding for optimal throughput.
141
참고 답변
Event A3 triggers handover when a neighbor cell becomes offset better than the serving cell.
142
참고 답변
NSA 5G uses existing 4G core network for control functions while adding 5G radio for data, enabling faster deployment. SA 5G has a full 5G core network, providing all 5G features like network slicing and lower latency, but requires more extensive infrastructure upgrades.
143
참고 답변
The MME initiates paging by sending a paging message to eNodeBs in the tracking area.
144
참고 답변
Adjacent channel interference can impact ARFCN calculation by introducing signal distortions and reducing the quality of communication. Proper consideration of adjacent channel interference is crucial for accurate ARFCN calculation.
145
참고 답변
5G technology is the fifth generation of cellular networks, designed to provide faster speeds, lower latency, increased capacity, and support for a massive number of connected devices compared to previous generations.
146
참고 답변
A shorter DRX cycle reduces wake-up time, lowering latency for data reception.
147
참고 답변
âA node is a point or junction where connections occur, representing a computer or device within a network. To establish a network connection, at least two nodes are required to interact with each other.â
148
참고 답변
A bearer is a logical path with defined QoS parameters for data transmission between UE and network.
149
참고 답변
Small cells are low-power, short-range base stations that enhance network coverage and capacity in dense urban areas. They play a crucial role in improving network performance and delivering consistent 5G experiences.
150
참고 답변
A /22 gives us 2^(32-22) = 1024 total addresses. With three departments, I'd give each a /24, which gives 256 addresses per subnet (254 usable hosts). So if we start with 192.168.0.0/22, I'd do 192.168.0.0/24 for department one, 192.168.1.0/24 for department two, and 192.168.2.0/24 for department three. That leaves 192.168.3.0/24 unused. If each department grew beyond 254 hosts, I could adjust, but for most companies, /24 per department is reasonable. I've done this kind of planning when we were segmenting departments into separate VLANs and needed to decide on IP ranges. The key is being methodical and leaving room for growth.
151
참고 답변
The key components of the 5G core network include the Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), and Network Slice Selection Function (NSSF).
152
참고 답변
RNTI identifies UEs and specific functions, such as C-RNTI for scheduling and RA-RNTI for random access responses.
153
참고 답변
SIB1 includes cell access info, PLMN, and scheduling of other SIBs.
154
참고 답변
The cyclic prefix is used to mitigate inter-symbol interference (ISI) by providing a guard period between symbols, allowing the receiver to handle multipath delays.
155
참고 답변
The foundational concepts include communication systems, types of modulation, channel encoding, and advantages of wireless over wired communication. Key elements such as antennas, sources, channels, and types of multiplexing are also covered, along with access methods like TDMA, FDMA, and CDMA.
156
참고 답변
5G ensures backward compatibility by supporting interworking and coexistence with existing 4G and 3G networks, allowing seamless connectivity and smooth transitions for users.
157
참고 답변
X2 interface enables ICIC by exchanging load and interference information between eNodeBs.
158
참고 답변
The air interface in 5G introduces new technologies such as massive MIMO, beamforming, and higher frequency bands (mmWave). It enables higher data rates, improved capacity, and lower latency.
159
참고 답변
Timing advance adjusts UE transmission timing to align with the eNodeB.
160
참고 답변
The air interface in 5G incorporates privacy protection measures, including secure authentication, user identity confidentiality, and encryption, to safeguard user data and privacy.
161
참고 답변
Measurement events (A1-A5, B1-B2) trigger reporting for handover and cell reselection.
162
참고 답변
Our company decided to migrate from traditional MPLS to SD-WAN, and I had never used SD-WAN before. I had three weeks to get up to speed before we started the pilot. I took an online course on the specific vendor's platform, set up a lab environment to experiment with configurations, and read through their documentation. I also called the vendor's solutions engineer and asked intelligent questions about how it differed from traditional WAN. Within two weeks, I had enough knowledge to pilot the technology with our branch office. The migration went smoothly, and I eventually became the team's expert on SD-WAN, which led to me presenting at our internal tech talks.
163
참고 답변
The NAS security mode command activates integrity and encryption algorithms.
164
참고 답변
There are many benefits to using a Network Monitoring System (NMS). It allows for proactive detection of possible troubles before they affect users by offering centralized monitoring of all network devices and performance measures. Capacity planning is made simpler by NMS, which monitors growth patterns and bandwidth usage. It makes thorough performance analysis possible in order to locate bottlenecks and that further effectiveness. NMS offers detailed logs and diagnostic data to help with faultfinding. Greater responsiveness and reduced maintenance are made possible by automated reporting for important events. Network visibility, dependability, and management effectiveness are ultimately enhanced by NMS.
165
참고 답변
The benefits of 5G technology include faster speeds and lower latency.
166
참고 답변
I analyze current usage trends, forecast future growth, and consider factors like new applications or services. I use this information to plan for upgrades or expansions to ensure the network can handle future demands without performance degradation.
167
참고 답변
The 5G NR architecture comprises three primary elements: - UE (User Equipment): The mobile device. - RAN (Radio Access Network): The network responsible for radio communication. - Core Network: The central part of the network managing services and data. The NG-RAN contains the gNB radio (base station), Control Unit, and Data Unit. AMF stands for Access and Mobility Management Function and UPF stands for User Plane Function.
168
참고 답변
A VPN stands for Virtual Private Network, a technology that allows a secure tunnel to be created across a network like the Internet. For example, VPNs enable you to set up a secure dial-up connection to a remote server, masking your IP geolocation to protect your identity and maintain privacy online.
169
참고 답변
Understanding of beamforming technology reveals the in-depth technical knowledge that the candidate possesses.
170
참고 답변
The 5G core Network can be modified depending on administrator settings, organisational dynamics and endorser profiles. When congestion occurs in the 5G System, many factors decide which user should be allowed or refrained.
171
참고 답변
The air interface in 5G introduces improved mobility management techniques, such as dual connectivity and fast handovers, to provide seamless mobility support for users moving across different cells and network areas.
172
참고 답변
ISI is distortion caused by overlapping of consecutive symbols due to multipath propagation. LTE addresses it using a cyclic prefix and OFDM.
173
참고 답변
During a virtualization project we bonded two 10-gig NICs per host using LACP for both failover and aggregation. We also enabled TCP checksum offload to save CPU cycles. When a driver update introduced latency, rolling back immediately fixed storage traffic. That proactive hardware awareness showcases the depth recruiters look for in network engineer interview questions.
174
참고 답변
MCS defines the modulation order and coding rate for data transmission, adapting to channel conditions.
175
참고 답변
RLC AM provides error correction through ARQ retransmissions and ensures in-order delivery of data.
176
참고 답변
Cell access barring restricts UEs from accessing the cell based on access class, used for congestion control.
177
참고 답변
The air interface in 5G focuses on energy-efficient design principles, including advanced power-saving mechanisms, dynamic resource allocation, and optimized signaling procedures to minimize energy consumption.
178
참고 답변
This is the lowest layer, and it deals with the physical connection between devices, such as cables, switches, and hubs. It's responsible for converting data into electrical signals and transmitting them over the network.
179
참고 답변
SA deployments require network operators to invest in building a standalone 5G core network. However, this investment enables them to fully harness the benefits of 5G and offer a wider range of innovative services.
180
참고 답변
HARQ Type 2 uses incremental redundancy, sending different coded bits in retransmissions.
181
참고 답변
Semi-persistent scheduling allocates resources periodically for services like VoIP, reducing control overhead.
182
참고 답변
The HARQ feedback timer waits for ACK/NACK before retransmission.
183
참고 답변
Networking teams are becoming more collaborative with other teams, such as development teams, with different team members working together toward a common project goal. This question is a good time for you to talk about your teamwork skills and give examples of when you collaborated with other team members or other computer and IT groups in your company and what you achieved. Your previous experience is a good indicator of how you can work within a team environment when you join a new company or organization.
184
참고 답변
ICIC uses X2 signaling to coordinate resource allocation and power levels.
185
참고 답변
HARQ combines FEC and retransmissions, with soft combining for efficiency.
186
참고 답변
PDSCH is mapped to resource elements in the data region, excluding control and reference signals.
187
참고 답변
This question helps to establish the depth of the candidate's exposure to 5G technology. Their response would reveal whether they have worked on MIMO, beamforming, 5G Network Function Virtualization (NFV), or other specific 5G technology platforms.
188
참고 답변
In one migration project we moved from a single PAT overload to segmented static NAT for web servers. I created object groups, documented translations, and verified via show nat logs. During cutover a vendor's SIP trunk failed; packet traces revealed the ALG altering headers. Disabling that feature restored audio. Walking interviewers through that root-cause path shows practical command of NAT—exactly what network engineer interview questions seek.
189
참고 답변
This is a general introductory question to gauge the candidate's background and hands-on experience in wireless network engineering.
190
참고 답변
I regularly read industry publications, attend webinars and conferences, participate in online forums, and pursue relevant certifications. I also experiment with new technologies in lab environments to gain hands-on experience.
191
참고 답변
CCEs are used to transmit PDCCH, with aggregation levels for different coverage.
192
참고 답변
STP (Spanning Tree Protocol) prevents network loops in Ethernet networks with redundant paths. It achieves this by identifying and blocking the redundant paths, ensuring there is only one active path between network devices. By dynamically adjusting to changes in the network topology, STP maintains a loop-free and stable network, which helps ensure continuous data flow and prevents broadcast storms.
193
참고 답변
5G stands for Fifth Generation, and NR stands for New Radio. This technology represents an evolution from LTE-Advanced and LTE-Advanced Pro. The standard is defined in 3GPP Release 15 and later versions.
194
참고 답변
The S1 interface connects the eNodeB to the core network, supporting S1-MME for control signaling and S1-U for user data.
195
참고 답변
To mitigate interference resulting from ARFCN miscalculation, techniques such as interference coordination, power control mechanisms, and adaptive modulation and coding schemes can be employed to improve overall system performance.
196
참고 답변
A Tracking Area is a group of cells for location management and paging.
197
참고 답변
BGP (Border Gateway Protocol) is an exterior gateway protocol used to exchange routing information between different autonomous systems (ASes) on the internet. It is used to determine the best path for data packets between different networks based on policies, path attributes, and reachability information. BGP is essential for internet routing and enables ISPs and large organizations to manage their routing policies and maintain connectivity with other networks.
198
참고 답변
SDN separates the network control plane from the data plane. This allows for more flexible and programmable network management. Benefits include centralized control, increased network agility, and easier implementation of network-wide policies.
199
참고 답변
In idle mode, RLF leads to cell reselection to find a suitable cell.
200
참고 답변
DRX in connected mode saves UE power while maintaining active data sessions.


Copyright © 2024. Designer by SPOTO Official Website. All Rights Reserved.