Question 1

Which statement is false?

AThe ASM multicast forwarding model does not allow the receiver to specify a multicast source.

BThe PIM SSM multicast routing protocol cannot set up shared multicast forwarding trees.

CThe SSM multicast forwarding model considers an (S,G) entry as one channel.

DThe IGMP SSM Mapping function is to map a (*,G) Join message reported by the host to an (S,G) Join messag

Answer : D

Question 2

The Huawei router is the last hop DR where the SSM Mapping function is enabled at the interface.

Some IGMPv2 hosts expect to receive (1.0.0.1, 232.1.0.1), (1.0.0.1, 232.1.0.2), and (2.0.0.1,

232.1.3.2) dat

a. How can you satisfy the preceding requirements with the least configurations?

Assm-mapping 232.1.0.2 32 1.0.0.1

Bssm-mapping 232.1.0.1 32 1.0.0.1

Cssm-mapping 232.1.0.0 24 1.0.0.1

Dssm-mapping 232.1.3.2 16 2.0.0.1

Essm-mapping 232.1.3.1 24 2.0.0.1

Fssm-mapping 232.1.3.0 8 2.0.0.1

Answer : C, E

Question 3

Which statement is false?

AThe SSM multicast forwarding model does not require shared trees.

BThe SSM multicast provides a better access control scheme than the ASM multicast.

CThe SSM Mapping function can map the IS_IN(S,G) message of the IGMPv3.

DThe PIM SM simultaneously supports SSM multicast and ASM multicast

Answer : C

Question 4

RTA is a leaf router that directly connects to host A through interface GigabitEthernet 1/0/0. The

interface is configured as follows:

interface GigabitEthernet1/0/0

undo shutdown

ip address 192.168.4.2 255.255.255.0

pim sm

igmp enable

igmp version 3igmp ssm-mapping enable

igmp static-group 232.1.1.1

Configurations in the IGMP view are as follows:

igmp

ssm-mapping 232.1.1.0 255.255.255.0 10.10.1.1

ssm-mapping 232.1.2.0 255.255.255.0 10.10.1.1

Host A sends an IGMPv2 Report message to group 232.1.2.2. Which entry can be displayed by the

display igmp ssm-mapping group command?

A(10.10.1.1, 232.1.1.1)

B(10.10.1.1, 232.1.2.2)

C(10.10.1.1, 232.1.1.1) and (10.10.1.1, 232.1.2.2)

DNo entry

Answer : C

Question 5

Which of the following statements about the working principle of LDP FRR are true?

AAfter LDP FRR is enabled, a backup LSP is generated. Both the primary and backup LSPs are stored in the forwarding table.

BLDP FRR can be deployed on the ingress node and the intermediate node.The primary and backup LSPs are recorded in the ILM table on the intermediate node and in the FIB table on the ingress node.

CMultiple LSPs can be backed up on the ingress node, that is, entries about multiple backup LSPs are generated in the forwarding table according to the priority of the LDR FRR, implementing multilayer protection.

DAfter LDP FRR is enabled, a backup LSP can be generated for a primary LSP to prevent serious packet loss during fast flapping of the primary LSP

Answer : A, B

Free Practice Questions for Huawei H31-161 Exam

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