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Question 1

A local router runs IS-IS and its command output is shown in the following figure. Which of the following statements is true?

Options :

A : The circuit level of S4/0/0 is Level-1.

B : S4/0/0 supports IPv6.

C : S4/0/0 sends IIH packets at the interval of 30s.

D : The cost of S4/0/0 is 20.

Answer: D

Question 2

TheAS_Pathattribute is an importantBGP attributeused for route selection. Which of the following statements aretrueabout this attribute?

Options :

A : When a route is advertised to an IBGP peer, the AS_Path remains unchanged.

B : This attribute can be used to prevent BGP routing loops.

C : This attribute is a well-known discretionary attribute that must be identified by all BGP routers.

D : BGP ignores AS_Confed_Sequence and AS_Confed_Set when calculating the AS_Path length.

Answer: A,B,D

Question 3

IP multicast effectively conserves network bandwidth and reduces network load. Therefore, it is widely used in network services, such as IPTV, real-time data transmission, and multimedia conferencing.

Options :

A : TRUE

B : FALSE

Answer: A

Question 4

When a routing policy is used to filter routes, which of the following route prefixes will be denied by the IP prefix below?

Options :

A : 1.1.1.1/26

B : 1.1.1.2/16

C : 1.1.1.1/32

D : 1.1.1.1/24

Answer: B,D

Question 5

On an OSPF network, if a router receives an update of an LSA that exists in the local LSDB, the router updates the LSDB and floods the LSA.

Options :

A : TRUE

B : FALSE

Answer: B