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问答题what’s the role of community attribute in the bgp route？

题目
问答题
what’s the role of community attribute in the bgp route？
参考答案和解析
正确答案： BGP communitiy can be used to as tag of a set of routes. Those tags can be used for applying specific routing policy for a group of routes.
There are four well-known communities：
Internet：all route belongs to this community by default and is advertised freely.
No-export：routes belong to the community cannot be advertised to EBGP peer.
No-advertise：routes belong to the community cannot be advertised to any BGP peer.
Local-as：routes belong to the community cannot be advertised to eBGP peer，or if confederation is used，routes cannot be advertised to conferation eBGP peer and normal eBGP peer.
解析： 暂无解析
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相似问题和答案

第1题：

What are two uses of the AS Path attribute?() (Choose two.)

A. route selection

B. loop avoidance

C. determining equal cost paths for reachablilty

D. defining the application of other BGP attributes


参考答案：A, B

第2题：

Which action occurs when the BGP route 20.1.0.0／16 is evaluated by the policy expression?()

A. The route is not announced.

B. The route is announced with community 90:1 added.

C. The route is announced with community 100:1 added.C.The route is announced with community 100:1 added.

D. The route is announced with communities 90:1 and 100:1 added.D.The route is announced with communities 90:1 and 100:1 added.


参考答案：D

第3题：

Which two BGP attributes support route reflection?()

A. Client ID

B. Cluster list

C. Originator ID

D. Reflection community


参考答案：B, C

第4题：

定义route－policytest如下:下列描述错误的是()

A.只有包含community100：1或者as-path为100的BGP路由才会通过route-policy test，并将AS-PATH改为200

B.只有包含community100：1并且as-path为100的BGP路由才会通过route-policy test，并将AS-path改为200

C.只有community为100：1并且AS-PATH为100的BGP路由才会通过route-policy test，并将AS-PATH改为200

D.Community为100：1并且AS-PATH为100的BGP路由会通过route-policy test，并将AS-PATH改为200


参考答案：A, C

第5题：

以下选项中哪些可以用于BGP的路由策略()。

A.ACL

B.ip prefix

C.community-list

D.as-path-acl

E.route-policy


答案ABCDE

第6题：

What are two advantages of BGP route aggregation?() (Choose two.)

A. It can reduce routing table size.

B. It allows for optimal route selection.

C. It can reduce the number of routing updates.

D. It always shortens the attribute list for the aggregated route.


参考答案：A, C

第7题：

What are two purposes of the AS_PATH attribute?()

A. route selection

B. loop avoidance

C. determining equal cost paths for reachablilty

D. defining the application of other BGP attributes


参考答案：A, B

第8题：

You receive an EBGP route configured with the no－export community set.To which types of peers can you send this route?() (Choose two.)

A. no BGP peers

B. all I-BGP peers

C. all E-BGP peers within your global AS

D. all E-BGP peers outside your global AS


参考答案：B, C

第9题：

Refer to the exhibit. Routers RTA and RTB are running BGP but the session is active. What command needs to be added to esta blish the BGP session? ()

A. ip route 10.10.10.1 255.255.255.255 s0/0 ip route 10.10.10.1 255.255.255.255 s0/1

B. network 10.10.10.0

C. no synchronization

D. neighbor 10.10.10.1 next - hop - self


参考答案：A

第10题：

仅用于BGP协议,匹配BGP路由信息的AS－PATH的路由选择工具是()

A.route-policy

B.ip-prefix

C.as-path-filter

D.community-filter


参考答案：C

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