QUESTION: 85

Which of the following information about BGP4+ is correct?

BGP4 can use the dampening command to suppress flapping of IBGP routes.
Modify BThe RouterID of the CP will cause the BGP connection between routers to be re- established.
BNext in CP4+ The Hop attribute is represented by an IPv6 address, which can be the link-local address of the next hop.
BGP4+ does not support automatic route aggregation.

Answer(s): B,C,D

As shown in the following topology, EBGP is run between AS100, AS200, AS300, and AS400, and the neighbor relationship has been established.
When AS400 receives the BGP route of the network segment 1.1.1.1/32 sent by AS100, the correct order of the paths recorded in the AS Path attribute is:
?

100, 200, 300
400, 300, 200, 100
100, 200, 300, 400
300, 200, 100

Answer(s): D

Explanation:

The AS path (AS_PATH) attribute is recognized as a mandatory attribute. This attribute field indicates which AS paths the routing update information passes through. It is used to ensure that there are no loops between ASs. AS_PATHThe attribute records all the AS numbers that a route passes through from the local to the destination address in a certain order.
When BGP advertises a route to other ASs, it adds the local AS number to the top of the AS_PATH list. The BGP router that receives the route can know the AS to go through to get to the destination address according to the AS_PATH attribute. The adjacent AS numbers closest to the local AS are listed first, and the other AS numbers are listed in order.

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QUESTION: 87

Which of the following descriptions about OSPF virtual links is correct?

A virtual connection can be established in any area, and it also belongs to the area after establishment
The virtual link uses the IP of the outgoing interface as the link address
Virtual links can be used to solve the problem of zone 0 being divided
cost of virtual connectionzero, is the optimal link

Answer(s): C

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QUESTION: 88

Which scenarios can use AS-path-filter?

A carried by routeSPATH attribute to filter routes received from BGP neighbors. For example the command peer xxxx as-path-fliter import
Route apply clause in policy
A carried by routeSPATH attribute to filter routes sent to BGP neighbors. For example the command peer xxxx as-path-ilter export
if-match clause in Route-policy

Answer(s): A,C,D

Explanation:

AS-path-filter is only used to match the as-path attribute, no action is taken. So B is wrong.

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Free Huawei H12-261_V3.0 Exam Questions (page: 23)

QUESTION: 85

QUESTION: 86

Explanation:

QUESTION: 87

QUESTION: 88

Explanation:

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