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问答题Multi-exit-discriminator、AS-Path、Weight、Local preference在BGP选路中的先后顺序？

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Multi-exit-discriminator、AS-Path、Weight、Local preference在BGP选路中的先后顺序？
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相似问题和答案

第1题：

In which three ways are C－BGP and E－BGP sessions similar?()

A. Both are configured as type external.

B. Both configurations use the peer-as command.

C. Neither advertises the local-preference attribute.

D. Both set next-hop self when advertising routes to peers.

E. Both modify the AS-path attribute when advertising routes.


参考答案：A, B, E

第2题：

关于BGP路由属性说法正确的是()。

A.在AS之间也可以使用local preference属性

B.AS-Path属性可以避免路由环路的产生

C.BGP的路由聚合可能会改变原有的AS-Path属性

D.下一跳属性路由不可达不影响BGP路由的发布

E.用import方式引入其它路由协议到BGP中，此路由在BGP中体现的起点属性为Incomplete


答案BCE

第3题：

Which BGP attribute is considered first as a tie－breaker in JUNOS software?()

A. origin

B. weight

C. as-path length

D. local-preference


参考答案：D

第4题：

What are the mandatory， well-known BGP attributes？（）

  • A、origin,AS-path,next-hop
  • B、AS-path,origin,MED
  • C、AS-path,origin,weight
  • D、AS-path,weight,MED

正确答案:A

第5题：

Which BGP command provides the router ID, local preference, next hop, and BGP path in its output?()

A. show ip route bgp

B. show ip bgp

C. show ip bgp neighbors

D. show ip bgp summary


参考答案：B

第6题：

In JUNOS software, what is the only BGP attribute where a higher value is preferred?()

A. MED

B. origin

C. preference

D. local preference


参考答案：D

第7题：

下面关于BGP的叙述哪个是正确的()。

A.BGP采用TCP方式发送路由协议信息

B.BGP每30秒就会刷新一次路由信息

C.BGP的AS-path属性不可控制

D.BGP对路由的控制可使用MED属性和Local preference属性来实现


答案AD

第8题：

Which BGP route selection criterion is superior?()

A. lowest MED

B. highest weight

C. lowest local preference

D. highest local preference


参考答案：B

第9题：

关于BGP Local－Preference,下面哪些描述是正确的?()

A.在BGP选路规则中，Preference-Value的优先级要高于Local-Preference，即优先比较Prefrred-Value

B.BGP路由Local-Preference的缺省值是100

C.BGPLocal-Preference通常在选路规则策略中用于控制数据流如何入AS

D.在BGP选路规则中，MED的优先级要高于Local-Preference即优先比较MED


参考答案：A, B

第10题：

A router has two paths to reach another network in a different autonomous system. Neither route was generated by the local router and both routes have the same default weight an d local preference values. Which statement is true about how BGP would select the best path?（）

  • A、To influence one route to be preferred, its default local preference value will be changed via the use of the command bgp default local - preference 50
  • B、Th e router will prefer the shortest autonomous system path
  • C、If the command bgp always - compare - med has been given, then the router will prefer the route with the highest MED
  • D、The router will prefer the route with the lower MED

正确答案:B

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