Huawei H12-831 Exam Questions and Answers, HCIP-Datacom-Advanced Routing & Switching Technology

Question #1

OSPFv2 is an IGP running on an IPv4 network; OSPFv3 is an IGP running on an IPv6 network. The basic working mechanism of OSPFv3 is the same as OSPFv2, such as the election of DR and BDR. As shown in the figure, an engineer uses three routers to test IPv6 services. He wants to realize the interconnection and interoperability of IPv6 networks by running OSPFv3. Which of the following statements regarding the election of DR on this network is correct?

A. fter the network converges, the engineer changes the priority of R1 to 100, the priority of R2 to 10, and the default value of R3

B. fter the network converges, a new device R4 is added to the broadcast link, and the priority of R4 is 150

C. fter the network converges, R1 is powered off and restarted

D. fter the network converges, R1 is the DR

View answer

Correct Answer: C

Question #2

All routers run OSPF as shown.

A. R2 generates Router LSAs in both area 1 and area 0correct

B. R2 forwards the Router LSA generated by R3 to R1

C. R2 forwards the Router LSA generated by R1 to R3

D. R2 only generates Router LSA in area 0

View answer

Correct Answer: A

Question #3

MPLS needs to assign labels to messages in advance and establish an LSP before it can forward messages. LSP is divided into static LSP and dynamic LSP. Which of the following protocols can be used to establish a dynamic LSP? (Multiple choice)

A. IS-IScorrect

B. RSVP-TEcorrect

C. PIM-SM

D. LDPcorrect

View answer

Correct Answer: ABD

Question #4

On a broadcast network, routers (including non-DIS routers) of the same level on a network segment can establish neighbor relationships. In the implementation of BFD for IS-IS, however, BFD sessions are established only between a DIS and non-DIS routers, not between non-DIS routers.

A. TRUE

B. FALSE

View answer

Correct Answer: A

Question #5

A network device has established an OSPF neighbor relationship. The configuration of its GE0/0/0 interface is shown in the figure. Which of the following commands executed on this interface will not affect the OSPF neighbor status of this interface? (Multiple choice)

A. undo ospf dr-prioritycorrect

B. undo descriptioncorrect

C. undo ospf Cost

D. undo ip address 10

View answer

Correct Answer: AB

Question #6

As shown in the figure, OSPF is enabled on all interfaces of the router, and the cost value of the link is marked in the figure. The Loopback0 interface of R2 is advertised in area 1, then the Cost value of R1 reaching 10.0.2.2/32 is:

A. 200correct

B. 150

C. 50

D. 100

View answer

Correct Answer: A

Question #7

The routing policy tools that can be used by BGP mainly include Filterpolicy and oRoute-policy. Fiterpolicy can only filter routes, Rote - policy can only modify routes

A. True

B. False

View answer

Correct Answer: B

Question #8

The security protection actions that can be performed by a secure MAC address do not include which of the following?

A. Protect

B. Restrict

C. Shutdown

D. Remarkcorrect

View answer

Correct Answer: D

Question #9

In a BGP/IPLS IP VPN network, the output information of a PE device VPN1 is shown in the figure. ip vpn-instance VPN1 ipv4-family route-distinguisher 100:1 vpn-target 100:1 200:1 300:1 export-extcommunity When the VPIv4 route corresponding to VPN1 is advertised to the remote PE, which VPNs of the remote PE will receive the route? (Multiple choice)

A. VPN1: Import RT=100:1correct

B. VPN4: Import RT=500:1

C. VPN2: Import RT=200:1, 400:1correct

D. VPN3: Import RT=100:1, 300:1correct

View answer

Correct Answer: ACD

Question #10

When a fault occurs, the fault can be classified to reduce the scope of fault location. Which of the following is not an interface configuration fault?

A. The duplex modes of the interfaces at both ends are inconsistent

B. IP address conflict

C. Inconsistent interface authentication

D. Inconsistent luminous power received at both endscorrect

View answer

Correct Answer: D

Question #11

A network device has established an OSPF neighbor relationship. The configuration of its GE0/0/0 interface is shown in the figure. Which of the following commands executed on this interface will not affect the OSPF neighbor status of this interface? (Multiple choice)

A. undo ospf dr-prioritycorrect

B. undo descriptioncorrect

C. undo ospf Cost

D. undo ip address 10

View answer

Correct Answer: AB

Question #12

MPLS determines the upstream and downstream relationship based on the data forwarding direction. The MPLS label message is sent from the upstream LSR and received and processed by the downstream LSR. Similarly, the release of MPLS labels is also distributed one by one from upstream to downstream.

A. True

B. Falsecorrect

View answer

Correct Answer: B

Question #13

The concepts of RD and RT are introduced in BGP/MPLS IP VPN network. Which of the following descriptions about RD and RT are correct? (Multiple choice)

A. The RD value is not used to identify the origin of a route, nor is it used to determine which VPN instance the route should be added to

B. A VPNv4 route can only contain one RD value and one RT value

C. RD is used to resolve IPv4 address conflicts before adding it to the IPv4 address

D. VPNv4 address is 96 bits in total, of which the RD value is 64 bits longcorrect

View answer

Correct Answer: ACD

Question #14

As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to realize network interoperability. R2, R3, and R4 in branch 2 deploy IS-IS to realize network intercommunication. Now the engineer wants to implement R1 to access the loopback interface address of R4. Which of the following operations can meet this requirement?

A. In the OSFF process and the IS-IS process of R2, the default route is advertised respectivelycorrect

B. No configuration required

C. Advertise the default route only in the IS-IS process of R2

D. Advertise the default route only in the OSPF process of R2

View answer

Correct Answer: A

Question #15

An administrator runs the display mpls Isp command to view LSPs on a device. The command output is shown in the figure. Which of the following statements are true?

A. Traffic sent from GEO/0/1 of the device to 3

B. Traffic sent from GE0/0/0 of the device to 1

C. For the traffic destined for 1

D. For the traffic destined for 3

View answer

Correct Answer: ABD

Question #16

As shown in the figure, RIR4 is one of the four routers in AS 123. They all run OSPE and realize the routing interconnection within the AS. Among them, the two network segments 10.1.1.0/24 and 10.4.4.0/24 are not published to OSPF. Now, R1 and R4 have established an IBGP peer relationship based on the Loopback0 interface, and published the network segments 10.1.1.0/24 and 10.4.4.0/24 to BGP respectively. Which of the following methods can enable PC1 and PC2 to communicate with each other? (Multiple choice)

A. Deploy policy routing on R1 and specify R2 as the next hop for traffic from PC1 to PC2

B. Run BGP on R2 and R3 and establish IBGP full interconnection in AS123correct

C. On R1 and R4, import routes 10

D. Activate MPLS and LDP on R1~R4 and establish LSPs for routes 1

View answer

Correct Answer: ABCD

Question #17

Which of the following statements about the multicast address used by 0SPFv3 is correct?

A. DR routers use FF08::6

B. All 0SPF routers use FF08: 5

C. All 5PF Routers use FF02:5

D. DRThe router uses FF02::6

View answer

Correct Answer: CD

Question #18

To support the processing and calculation of IPv6 routes, IS-IS adds a new MLPID in TLV No. 129. MLPID is an 8-bit field that identifies a network layer protocol message. Which of the following is the MLPID value for IPv6?

A. 204

B. 142correct

C. 232

D. 236

View answer

Correct Answer: B

Question #19

According to this figure, which statement is correct about the IPv6 routing information calculated by the R4 router through IS-IS?

A. R4 has 1 IS-IS default route

B. R4 has 2 IS-IS default routes of equal costcorrect

C. R4 has 2 IS-IS default routes with unequal cost

D. R4 has no IS-IS routing entry

View answer

Correct Answer: B

Question #20

In the network shown in the figure, R1 and R2 are configured with single-hop BFD detection. The network engineer found that the BFD session was Down, so he queried the configuration related to R1 and R2 BD. The configuration information has been marked in the figure. According to the configuration information, the reason for the BFD session Down is that the time parameters configured on R1 and R2 do not match.

A. True

B. Falsecorrect

View answer

Correct Answer: B

Question #21

A router is running OSPF, and the output information is as shown in the figure. Which of the following statements is correct?

A. The type of the LSA is AS-externa1-LSA

B. The destination network described by this LSA is 10

C. The LSA in the figure is generated by this router

D. This device is ABR Answer: B

View answer

Correct Answer: B

Question #22

The detection mechanism of BFD is that two systems establish a BFD session and periodically send BFD control messages along the path between them. If one party does not receive the BFD control message within a specified time, it is considered that a fault has occurred on the path. Which of the following reasons will not cause the BFD session to go Down?

A. The remote identifier and local identifier of the BFD session do not match

B. The message with UDP port number 4784 is rejected

C. The session-name of the BFD session is inconsistentcorrect

D. The outbound interface bound to the single-hop BFD session is physically faulty

View answer

Correct Answer: C

Question #23

Which of the following operations is not part of the middle stage of dissection?

A. field defense

B. cutover implementation

C. Cutover preparation

D. business test

View answer

Correct Answer: D

Question #24

An enterprise purchased the leased lines of two operators. In order to optimize the route, the enterprise used the 6GP protocol to learn routing entries of the two operators. However, the company found that after such a configuration, the traffic of the export routing increased greatly. After the network engineering investigation, it was found that the traffic of the two operators was passed to each other through the company's export router. Therefore, the company intends to use routing strategies to preven

A. RUE

B. ALSE

View answer

Correct Answer: A

Question #25

In the Hub&Spoke network shown in the figure, Hub-PE can allow local AS number duplication through manual configuration to achieve correct routing transmission.

A. Truecorrect

B. False

View answer

Correct Answer: A

Question #26

The OSPF protocol requires routers in the same area to save the same link state database LSDB. As the number of routes on the network continues to increase, some routers cannot carry so much routing information due to limited system resources. This state is called database overload. If all routers in an OSPE network are configured with "Isdb-overf1low-limit number 7", which of the following scenarios may cause the router to enter the Overflow state? (Multiple choice)

A. The number of Type 5 LSAs exceeds 7correct

B. The number of Type 3 LSAs exceeds 7

C. The number of Type 4 LSAs exceeds 7

D. The number of Type 7 LSAs exceeds 7correct

View answer

Correct Answer: AD

Question #27

The network administrator has deployed the DHCP snooping function on the access switch. Which of the following solutions can be used to reduce the impact of attackers maliciously applying for IP addresses and causing DHCP Server denial of service? (Multiple choice)

A. Enable the device to generate static MAC entries for interfaces based on the DHCP Snooping binding table

B. Configure DHCP Snooping to check the CHADDR field in the DHCP Request messagecorrect

C. Set the interface on the switch that is connected to the legitimate DHCP server as a trusted interface

D. Limit the number of MAC addresses learned by the switch interface through DHCP Snoopingcorrect

View answer

Correct Answer: ABD

Question #28

As shown in the figure, all interfaces of the router enable OSPF. Which of the following statements is correct?

A. he Type1 LSA generated by R2 in area 0 contains 10

B. he Type5 LSA generated by R2 in area 0 contains 10

C. he Type2 LSA generated by R2 in area 0 contains 10

D. he Type3 LSA generated by R2 in area 0 contains 10

View answer

Correct Answer: A

Question #29

Use "display ospfv3 peer verbose" to view OSPFv3 neighbor information. In the output information, you can see the peer's Router ID, the global unicast address of the peer's interface, the neighbor's status, and other content.

A. True

B. Falsecorrect

View answer

Correct Answer: B

Question #30

Regarding the IPSG, which of the following statement is incorrect?

A. IPSG can prevent IP address spoofing attacks

B. IPSG is a source IP address filtering technology based on the three-layer interface

C. IPSG can turn on the IP packet inspection and alarm function, and cooperate with the network management to perform alarms

D. IPSG can prevent the host from changing the IP address privately

View answer

Correct Answer: B

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