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Free Huawei H12-821 Practice Questions & Answers 2026 Part2 | HCIP-Datacom-Core Technology

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Question #1
Which of the following attributes must be carried when BGP sends route update messages?
A. MED
B. Next_Hop
C. AS_Path
D. Local_Preference
View answer
Correct Answer: BC

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Question #2
At which layer does a packet filtering firewall check data packets?
A. Data link layer
B. Network layer
C. Application layer
D. Physical layer
View answer
Correct Answer: B
Question #3
Two Level-1 routers in different areas can establish a neighbor relationship.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #4
Which of the following statements regarding the OSPF protocol is false?
A. Each OSPF router uses only one Router-LSA to describe the local active connection status of an area
B. Routing information can be advertised only between backbone and non-backbone areas and cannot be advertised directerly between non-backbone areas
C. Router-LSA describes four connection types: P2P, TransNet, SubNet, and virtual link
D. Link State ID in a Type 3 LSA indicates the router ID of an ABR
View answer
Correct Answer: C
Question #5
Multiple BGP processes cannot be configured on the same router.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #6
Which of the following statements regarding Network Address and Port Translation (NAPT) and No Port Translation (No-PAT) is true?
A. In NAPT mode, only the network layer protocol address can be converted
B. After NAPT translation, all packets are from the same IP address for external users
C. In No-PAT mode, only the transport layer protocol port number can be converted
D. In No-PAT mode, the network layer protocol address can be converted
View answer
Correct Answer: BD
Question #7
As shown in the figure, data traffic from a STA is forwarded by the HAP to the upper-layer network in direct forwarding mode before roaming, and the HAP is configured as the home agent.What is the flow direction of data traffic after Layer 3 roaming?
A. STA -> FAP -> FAC -> HAC -> HAP -> Upper-layer network
B. STA -> FAP -> FAC -> HAC -> HAP -> HAC -> Upper-layer network
C. STA -> FAP -> FAC -> HAC -> Upper-layer network
D. STA -> FAP -> FAC -> Upper-layer network
View answer
Correct Answer: A
Question #8
Which of the following statements regarding the MED value in BGP are true? (Choose all that apply.)
A. According to BGP route selection rules, the MED value has a lower priority than AS Path, Preferred-Value,Local-Preference, and Origin
B. The default MED value of BGP routes is 0
C. By default, BGP can compare the MED values of routes from different ASs
D. By default, if there is no MED value in routes, the value 0 is used
View answer
Correct Answer: ABD
Question #9
Which of the following LSAs can carry tag information of external routes?
A. Type 2 LSA
B. Type 5 LSA
C. Type 4 LSA
D. Type 3 LSA
View answer
Correct Answer: B
Question #10
Which of the following statements regarding the MED value in BGP are true? (Choose all that apply.)
A. According to BGP route selection rules, the MED value has a lower priority than AS Path, Preferred-Value,Local-Preference, and Origin
B. The default MED value of BGP routes is 0
C. By default, BGP can compare the MED values of routes from different ASs
D. By default, if there is no MED value in routes, the value 0 is used
View answer
Correct Answer: ABD
Question #11
In the VRP, by default, the routes imported by BGP will be automatically summarized.
A. ALSE
B. RUE
View answer
Correct Answer: A
Question #12
If a router receives two BGP routes carrying the following attributes, which of the following statements is true according to BGP route selection rules?
A. he optimal route is route N because its MED value is smaller than that of route M
B. he optimal route is route N because its AS_Path is longer than that of route M
C. he optimal route is route M because its AS_Path is shorter than that of route N
D. he optimal route is route M because its MED value is larger than that of route N
View answer
Correct Answer: C
Question #13
Which of the following statements regarding the display bgp routing-table command output is true?
A. The route to the destination address 192
B. The MED value of the route to the destination address 192
C. The route to the destination address 192
D. The route to the destination address 192
View answer
Correct Answer: D
Question #14
What is the default sending interval of BFD packets?
A. 100ms
B. 1000ms
C. 10s
D. 5s
View answer
Correct Answer: A
Question #15
Multiple BGP processes cannot be configured on the same router.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #16
See the network shown in the following figure. Route leaking is configured on R1. In this case, R1 sends a Level-2 LSP to R3 so that R3 can learn routes on the entire network.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #17
Which of the following IEEE 802.11 standards is also known as Wi-Fi 6?
A. 802
B. 802
C. 802
D. 802
View answer
Correct Answer: D
Question #18
Which of the following methods is usually used by a network administrator to configure a newly purchased device for the first time?
A. Telnet
B. SNMP
C. Login through the Console port
D. FTP
View answer
Correct Answer: C
Question #19
Which of the following route selection tools can be used by other routing protocols in addition to BGP?
A. community-filter
B. ACL
C. IP-prefix
D. as-path-filter
View answer
Correct Answer: BC
Question #20
Which of the following statements regarding authentication in BGP configuration is true?
A. A pair of BGP peers must use the same plaintext password
B. All BGP peers of a router must use the same password
C. All the routers in the same AS must use the same password
D. A pair of BGP peers must use the same MD5 password
View answer
Correct Answer: D
Question #21
On an RSTP network, port priorities may be compared during root port or designated port election. Which of the following values is the default priority of a port on a Huawei switch?
A. 28
B. 2768
C. 096
D.
View answer
Correct Answer: A
Question #22
The stateful inspection firewall uses the session table to trace activated TCP and UDP sessions, firewall security policies determine which sessions are established, and only the packets associated with sessions are forwarded.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #23
On an IS-IS network, each router can generate LSPs. Which of the following events trigger thegeneration of a new LSP?
A. elated IS-IS interfaces go up or down
B. eriodic updates occur
C. nter-area IP routes change
D. he IS-IS interface cost is increased
View answer
Correct Answer: ABD
Question #24
MAC address-prioritized Portal authentication allows disconnected users who have completed Portal authentication to directly access the network again within a certain period of time after the disconnection without having to perform Portal authentication again.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #25
Which of the following statements regarding OSPF multi-instance is false?
A. Route exchange between different OSPF processes is similar to route exchange between different routing protocols
B. An interface of a router belongs to only a certain OSPF process
C. The OSPF process IDs must be the same when OSPF neighbor relationships are established between different routers
D. Multiple OSPF processes can run on the same router, and they are independent of each other
View answer
Correct Answer: C
Question #26
Which of the following statements regarding the stateful inspection firewall is true?
A. AWhen the stateful inspection firewall checks packets, packets of one same connection are not correlated
B. BBecause UDP is a connectionless protocol, so the stateful inspection firewall cannot match UDP packets with the status table
C. CThe stateful inspection firewall only needs to match the first data packet against a rule, and the subsequent packets of the connection are matched directly in the state table
D. DThe stateful inspection firewall needs to match the rules for each incoming packet
View answer
Correct Answer: C
Question #27
See the network shown in the following figure. R1 and R2 run IS-IS, and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2.Which of the following statements are true? (Choose all that apply.)
A. The routing table of R1 contains the route 10
B. The routing table of R1 does not contain the route 10
C. The routing table of R1 does not contain the routes 10
D. The routing table of R1 contains the route 10
View answer
Correct Answer: BD
Question #28
Which of the following statements regarding the display bgp routing-table command output is true?
A. The route to the destination address 192
B. The MED value of the route to the destination address 192
C. The route to the destination address 192
D. The route to the destination address 192
View answer
Correct Answer: D
Question #29
One VRRP virtual router can only have the virtual IP address.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #30
Which cost types are supported in IS-IS? (Choose all that apply.)
A. default
B. wide
C. ToS
D. Narrow
View answer
Correct Answer: ABCD
Question #31
Which of the following statements regarding the BGP error display of a router is false?
A. The error occurred at 11:40:39 on March 22, 2010
B. The neighbor address of this router is 10
C. The error may be caused by the incorrect peer AS number
D. Error Type indicates that the BGP error is caused by the neighbor relationship error
View answer
Correct Answer: C
Question #32
Route summarization can effectively reduce the number of BGP routes. However, many parameters need to be properly set when configuring BGP route summarization. Otherwise, problems such as routing loops may occur.Which of the following statements is false about BGP route summarization?
A. f the aggregate command with suppress-policy specified is run on a device, the device advertises only the specific routes that match the given routing policy
B. f the aggregate command with detail-suppressed specified is run on a device, the device advertises only the summary route
C. f the aggregate command is run on a device, the device advertises both specific and summary routes
D. f the summary automatic command is run on a device, the device summarizes subnet routes based on natural network segments
View answer
Correct Answer: C
Question #33
This is part of output information on router Huawei.Which of the following statements regarding the output information is false?
A. The group address is 225
B. The display pim rp-info command displays RP information for a multicast group
C. The RP address is 2
D. The RP priority is 0
View answer
Correct Answer: A
Question #34
When OSPFv3 runs on a Huawei router, the router automatically selects an interface address as the Router ID of the OSPFv3 process.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #35
BFD provides fast fault detection independent of media and routing protocols. To use this mechanism to detect link connectivity, devices at both ends must support this feature.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #36
See the command output of a router below.Which of the following statements are true? (Choose all that apply.)
A. The interface IP address is 10
B. The network type of the interface is broadcast
C. The router is a DR
D. The router ID is 10
View answer
Correct Answer: BCD
Question #37
Which of the following statements about IS-IS Hello packets are true? (Choose all that apply.)
A. Level-1 LAN IIH packets do not contain the System ID field
B. P2P IIH packets and LAN IIH packets are exactly the same
C. P2P IIH packets do not contain the Priority field
D. Level-1 LAN IIH packets are sent in multicast mode
View answer
Correct Answer: CD
Question #38
Which of the following attributes cannot be directly referenced in an apply clause of a route-policy?
A. IP-prefix
B. origin
C. tag
D. community
View answer
Correct Answer: A
Question #39
Which of the following parameters are not mandatory during the configuration of a BGP peer? (Choose all that apply.)
A. password
B. Peer IP address
C. as-number
D. description
View answer
Correct Answer: AD
Question #40
See the network shown in the following figure. R1 and R2 run IS-IS, and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2.Which of the following statements are true? (Choose all that apply.)
A. The routing table of R1 contains the route 10
B. The routing table of R1 does not contain the route 10
C. The routing table of R1 does not contain the routes 10
D. The routing table of R1 contains the route 10
View answer
Correct Answer: BD
Question #41
Multiple BGP processes cannot be configured on the same router.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #42
The VRID of the VRRP virtual router is 3 and the virtual IP address is 100.1.1.10. What is the virtual MAC address?
A. 01-00-5E-00-01-64
B. 01-00-5E-00-01-03
C. 00-00-5E-00-01-64
D. 00-00-5E-00-01-03
View answer
Correct Answer: D
Question #43
Which of the following statements regarding DR/BDR are false? (Choose all that apply.)
A. In a broadcast network, DR and BDR must be elected
B. All DR others establish neighbor relationships with DR and BDR only
C. DR others listen on the multicast address 224
D. DR others listen on the network address 224
View answer
Correct Answer: AD
Question #44
Which of the following statements regarding the BGP error display of a router is false?
A. The error occurred at 11:40:39 on March 22, 2010
B. The neighbor address of this router is 10
C. The error may be caused by the incorrect peer AS number
D. Error Type indicates that the BGP error is caused by the neighbor relationship error
View answer
Correct Answer: C
Question #45
Which of the following statements regarding the MED value in BGP are true? (Choose all that apply.)
A. According to BGP route selection rules, the MED value has a lower priority than AS Path, Preferred-Value,Local-Preference, and Origin
B. The default MED value of BGP routes is 0
C. By default, BGP can compare the MED values of routes from different ASs
D. By default, if there is no MED value in routes, the value 0 is used
View answer
Correct Answer: ABD
Question #46
Which of the following statements regarding BGP peer are false? (Choose all that apply.)
A. BGP peers exchange link state information
B. A UDP connection must be established before BGP relationships are established
C. BGP routers support automatic neighbor discovery
D. BGP peers must be configured with MD5 authentication
View answer
Correct Answer: ABC
Question #47
Multiple BGP processes cannot be configured on the same router.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #48
See the network shown in the following figure. R1 and R2 run IS-IS, and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2.Which of the following statements are true? (Choose all that apply.)
A. The routing table of R1 contains the route 10
B. The routing table of R1 does not contain the route 10
C. The routing table of R1 does not contain the routes 10
D. The routing table of R1 contains the route 10
View answer
Correct Answer: BD
Question #49
Which of the following LSAs can carry tag information of external routes?
A. Type 2 LSA
B. Type 5 LSA
C. Type 4 LSA
D. Type 3 LSA
View answer
Correct Answer: B
Question #50
Two Level-1 routers in different areas can establish a neighbor relationship.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #51
Which cost types are supported in IS-IS? (Choose all that apply.)
A. default
B. wide
C. ToS
D. Narrow
View answer
Correct Answer: ABCD
Question #52
If a router receives two BGP routes carrying the following attributes, which of the following statements is true according to BGP route selection rules?
A. The optimal route is route N because its MED value is smaller than that of route M
B. The optimal route is route N because its AS_Path is longer than that of route M
C. The optimal route is route M because its AS_Path is shorter than that of route N
D. The optimal route is route M because its MED value is larger than that of route N
View answer
Correct Answer: C
Question #53
Which of the following statements regarding OSPF route summarization commands are true? (Choose all that apply.)
A. The asbr-summary command is executed in the OSPF view
B. The abr-summary command is executed in the OSPF area view
C. advertise is the default parameter of the abr-summary command
D. not-advertise is the default parameter of the abr-summary command
View answer
Correct Answer: BC
Question #54
Which of the following parameters are not mandatory during the configuration of a BGP peer? (Choose all that apply.)
A. password
B. Peer IP address
C. as-number
D. description
View answer
Correct Answer: AD
Question #55
On an OSPF network, routers learn routing information on the entire network by exchanging LSAs. Which of the following values is the LS Age in the LSA header when an LSA is deleted? LSA Lifetime and Deletion The LS Age field in the LSA header tracks the age of an LSA. When the LS Age reaches its maximum value (3600 seconds), the LSA is marked for deletion. This ensures old or stale LSAs are removed from the network to maintain accurate routing information. HCIP-Datacom-Core Reference Detailed explanation of LS Age behavior and LSA deletion processes can be found in the OSPF LSDB and LSA sections.
A. 1800s
B. 3600s
C. 1200s
D. 600s
View answer
Correct Answer: B
Question #56
If a router receives two BGP routes carrying the following attributes, which of the following statements is true according to BGP route selection rules?
A. The optimal route is route N because its MED value is smaller than that of route M
B. The optimal route is route N because its AS_Path is longer than that of route M
C. The optimal route is route M because its AS_Path is shorter than that of route N
D. The optimal route is route M because its MED value is larger than that of route N
View answer
Correct Answer: C
Question #57
Which of the following statements regarding the MED value in BGP are true? (Choose all that apply.)
A. According to BGP route selection rules, the MED value has a lower priority than AS Path, Preferred-Value,Local-Preference, and Origin
B. The default MED value of BGP routes is 0
C. By default, BGP can compare the MED values of routes from different ASs
D. By default, if there is no MED value in routes, the value 0 is used
View answer
Correct Answer: ABD
Question #58
In an OSPF routing domain, two routers must be specified as one DR and one BDR in a broadcast or NBMAnetwork with at least two routers.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #59
Which of the following statements regarding different LSA types is false?
A. LS Update packets contain complete LSA information
B. LS Ack packets contain complete LSA information
C. LS Request packets contain only LS Type, LS ID, and Advertising Rooter
D. DD packets contain only LSA summary information, including LS Type, LS ID, Advertising Router, and LS Sequence Number
View answer
Correct Answer: B
Question #60
See the network shown in the following figure. R1 and R2 run IS-IS, and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2.Which of the following statements are true? (Choose all that apply.)
A. The routing table of R1 contains the route 10
B. The routing table of R1 does not contain the route 10
C. The routing table of R1 does not contain the routes 10
D. The routing table of R1 contains the route 10
View answer
Correct Answer: BD
Question #61
On the network shown in the figure, three switches run RSTR The figure shows the configuration.Which is the root switch?
A. Uncertain
B. SWA
C. SWB
D. SWC
View answer
Correct Answer: B
Question #62
After the IGMP proxy device receives the report message of a certain multicast group, if the corresponding multicast group is not found, the IGMP proxy device will send a report message for the multicast group to the access device, and then Add the multicast group to the forwarding table.
A. ALSE
B. RUE
View answer
Correct Answer: B
Question #63
The interface IP address and VRRP virtual IP address can be the same
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #64
Which of the following parameters are not mandatory during the configuration of a BGP peer? (Choose all that apply.)
A. password
B. Peer IP address
C. as-number
D. description
View answer
Correct Answer: AD
Question #65
ACLs are a common matching tool in routing policies. An ACL can be configured on a router to match routes.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #66
Which of the following statements regarding OSPF multi-instance is false?
A. Route exchange between different OSPF processes is similar to route exchange between different routing protocols
B. An interface of a router belongs to only a certain OSPF process
C. The OSPF process IDs must be the same when OSPF neighbor relationships are established between different routers
D. Multiple OSPF processes can run on the same router, and they are independent of each other
View answer
Correct Answer: C
Question #67
Which of the following statements regarding the BGP error display of a router is false?
A. The error occurred at 11:40:39 on March 22, 2010
B. The neighbor address of this router is 10
C. The error may be caused by the incorrect peer AS number
D. Error Type indicates that the BGP error is caused by the neighbor relationship error
View answer
Correct Answer: C
Question #68
This is part of output information on router Huawei.Which of the following statements regarding the output information is false?
A. The group address is 225
B. The display pim rp-info command displays RP information for a multicast group
C. The RP address is 2
D. The RP priority is 0
View answer
Correct Answer: A
Question #69
The following is part of output information on router Huawei.Which of the following statements regarding the output information is false?
A. The DR address on the interface is 10
B. GigabitEthernet/0 of the router runs PIM-SM
C. The PIM status on GigabitEthernet/0 of the router is Up
D. GigabitEthernet/0 of the router runs PIMv2
View answer
Correct Answer: A
Question #70
Which of the following statements regarding OSPF neighbor relationship and adjacency is true?
A. Not all neighbors can establish adjacencies
B. Neighbor relationships are selected from adjacencies to exchange routing information
C. OSPF routers must establish an adjacency before exchanging information
D. Adjacencies are maintained using OSPF DD packet
View answer
Correct Answer: A
Question #71
Multiple BGP processes cannot be configured on the same router.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #72
Which of the following statements regarding the display bgp routing-table command output is true?
A. The route to the destination address 192
B. The MED value of the route to the destination address 192
C. The route to the destination address 192
D. The route to the destination address 192
View answer
Correct Answer: D
Question #73
Which of the following parameters are not mandatory during the configuration of a BGP peer? (Choose all that apply.)
A. password
B. Peer IP address
C. as-number
D. description
View answer
Correct Answer: AD
Question #74
Which of the following statements regarding the MED value in BGP are true? (Choose all that apply.)
A. According to BGP route selection rules, the MED value has a lower priority than AS Path, Preferred-Value,Local-Preference, and Origin
B. The default MED value of BGP routes is 0
C. By default, BGP can compare the MED values of routes from different ASs
D. By default, if there is no MED value in routes, the value 0 is used
View answer
Correct Answer: ABD
Question #75
Which of the following statements regarding the BGP error display of a router is false?
A. The error occurred at 11:40:39 on March 22, 2010
B. The neighbor address of this router is 10
C. The error may be caused by the incorrect peer AS number
D. Error Type indicates that the BGP error is caused by the neighbor relationship error
View answer
Correct Answer: C
Question #76
See the network shown in the following figure. R1 and R2 run IS-IS, and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2.Which of the following statements are true? (Choose all that apply.)
A. The routing table of R1 contains the route 10
B. The routing table of R1 does not contain the route 10
C. The routing table of R1 does not contain the routes 10
D. The routing table of R1 contains the route 10
View answer
Correct Answer: BD
Question #77
When the MTUs of two interfaces connecting two routers in a broadcast network do not match, which of the following statements of two routers regarding OSPF neighbor state change is true?
A. The OSPF neighbor state remains Init
B. The OSPF neighbor state remains Exstart
C. The OSPF neighbor state can be Full
D. The OSPF neighbor state remains 2-way
View answer
Correct Answer: B
Question #78
On an office network of an enterprise, OSPF is enabled on two directly connected routers. During adjacency establishment, the state machine stays in the 2-way state. Which of the following statements are not possible causes?
A. Hello time values are different
B. Area IDs are different
C. Router IDs conflict
D. The N-bit and E-bit of Hello packets are the same
View answer
Correct Answer: CD
Question #79
Which of the following parameters are not mandatory during the configuration of a BGP peer? (Choose all that apply.)
A. password
B. Peer IP address
C. as-number
D. description
View answer
Correct Answer: AD
Question #80
One VRRP virtual router can only have the virtual IP address.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #81
Which command is used to enable association between BFD and VRRP?
A. vrrp vrid 1 track bfd-session session-name 1 reduced 100
B. vrrp vrid 1 track bfd-session-name 1 reduced 100
C. bfd-session vrrp vrid 1 track session-name 1 reduced 100
D. track vrrp vrid 1 bfd-session session-name 1 reduced 100
View answer
Correct Answer: A
Question #82
Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure.Which of the following statements is true?
A. The LSDB of R2 does not contain the LSP of R4
B. The LSDB of R1 does not contain the LSP of R4
C. The LSDB of R2 does not contain the LSP of R3
D. The LSDB of R3 does not contain the LSP of R4
View answer
Correct Answer: B
Question #83
On an OSPF network, if a router functions as an ABR, the router must also be a BR.
A. ALSE
B. RUE
View answer
Correct Answer: A
Question #84
Which of the following methods is usually used by a network administrator to configure a newly purchased device for the first time?
A. Telnet
B. SNMP
C. Login through the Console port
D. FTP
View answer
Correct Answer: C
Question #85
Which of the following statements regarding OSPF neighbor relationship and adjacency is true?
A. Not all neighbors can establish adjacencies
B. Neighbor relationships are selected from adjacencies to exchange routing information
C. OSPF routers must establish an adjacency before exchanging information
D. Adjacencies are maintained using OSPF DD packet
View answer
Correct Answer: A
Question #86
Which of the following statements regarding OSPF is true?
A. OSPF does not have an acknowledgement mechanism
B. OSPF performs LSDB update every 30 minutes
C. OSPF uses the Bellman-Ford algorithm, and each router independently runs this algorithm
D. OSPF floods an LSU packet at an interval of 5s
View answer
Correct Answer: C
Question #87
Multiple BGP processes cannot be configured on the same router.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #88
Which of the following methods is usually used by a network administrator to configure a newly purchased device for the first time?
A. Telnet
B. SNMP
C. Login through the Console port
D. FTP
View answer
Correct Answer: C

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