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【多选题】

关于OSPF as-external-LSA说法正确的是（）

A、link state id被设置为目的网段地址

B、Advertising Router被设置为ASBR的routerid

C、Netmask被设置全0

D、使用Link state ID和advertising router可以唯一标识一条AS-EXTERNAL-LSA

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更多“关于OSPF as-external-LSA说法正确的是（）”相关的问题
第1题
[单选题] Router R1 sits inside OSPF area 1. Router R2 redistributes an E1 route into OSPF for prefix 2.2.2.0/24, with external metric 20. Router R22 redistributes an E2 route for the same prefix/length, external metric 10. Under what conditions will R1 choose as it s best route the route through R22?（）

A、R1 will always choose the route through R22.  B、As long as R1's best internal OSPF cost to reach R22 is less than 10.  C、As long as R1's best internal OSPF cost to reach R22 is less than 20.  D、R1 will never choo se the route through R22 if the E1 route through R2 is available.  

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第2题
[单选题] 关于OSPF外部路由种类描述正确的是（）

A、OSPF外部路由一共有5种  B、OSPF第一类外部路由的开销值只是AS外部开销值，互联AS内部开销值  C、OSPF第二类外部路由的开销值为AS内部开销与外部开销之和  D、在其他条件相同的情况下，OSPF的第一类外部路由永远比第二类外部路由优先  

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第3题
[] Your MPLS implementation is currently using internal backdoor links. What can you do to minimize the impact of having these links?（）

A、A. use BGP as the CE-PE routing protocol  B、B. use OSPF as the CE-PE routing protocol  C、C. use EIGRP as the CE-PE routing protocol  D、D. use the SP to redistribute routes as external routes for OSPF and EIGRP  E、E. use route redistribution at each location to ensure external routes are imported into the IGP  

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第4题
[单选题] Examine the following excerpt from the show ip eigrp topology 10.2.2.0/24 command on router R1.Which answer can be verified as definitely true based on this output?（） External data: Originating router is 10.1.1.1 AS number of route is 1 External protocol is OSPF, external metric is 64 Administrator tag is 0 (0x00000000)

A、R1 is the router that redistributed the route  B、R1's metric to reach subnet 10.2.2.0/24 is 64  C、The route was redistributed on a router that has a router ospf 1 command configured  D、R1 is redistributing a route to prefix 1 0.2.2.0/24 into OSPF  

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第5题
[单选题] 关于OSPF的AS-External-LSA中LSA的头部信息描述错误的是（）

A、Link State ID表示的目的网络地址  B、Advertising Router表示ASBR的Router ID  C、Net mask表示目的网段的网络掩码  D、Forwarding Address永远是0.0.0.0  

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第6题
[单选题] Which show command will display only the Type 5 LSAs in the OSPF topology database？（）

A、show ip ospf database external  B、show ip ospf database nssa - external  C、show ip route ospf  D、show ip ospf datab ase summary  E、show ip route  

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第7题
[单选题] 下面哪个是OSPF stub区域的特性？（）

A、AS-EXTERNAL-LSA允许被发布到STUB区域内  B、到AS外部的路由只能基于由ABR手工生成的一条默认路由  C、虚链接不能跨越末节区域  D、任何区域都可以成为末节区域  

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第8题
[多选题] Which two OSPF LSA types are new in OSPF version 3？ （）

A、Link  B、NSSA external  C、Network link  D、Intra-area prefix  E、AS domain  

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第9题
[多选题] Refer to the exhibit. OSPF is configured on all routers in the network. Area 5 is configured as an NSSA areA. The RIPv2 routes are redistributed into the OSPF domain on router R5. What two types of LSAs will be originated by router R5?（）

A、type 1 Router LSA  B、type 2 Network LSA  C、type 3 Network Summary LSA  D、type 4 ASBR Summary LSA  E、type 5 AS External LSA  F、type 7 NSSA External LSA  

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