输入哪条命令可以看到以下信息？（） LS DataBase  Type :Router Ls id :10.1.2.2  Ady rtr :1050   Len :72  Seq# :80000008  Cksum (DC)  Area Border Router  Link count 4  Link id :192.168.2.1  Data :255.255.255.255  Metric:1562  Link id :10.1.2.2  Data :10.1.3.1  Type :Router 

A network planning diagram shows a large internetwork with many routers. The configurations show that OSPF has been enabled on all interfaces, I P addresses correctly configured, and OSPF workinG.For which of the following cases would you expect a router to create and flood a Type 2 LSA?（）

A. When OSPF is enabled on a LAN interface, and the router is the only router connected to the subnet.

B. When OSPF is enabled on a point - to -point serial link, and that router has both the higher router ID and higher interface IP address on the link.

C. When OSPF is enabled on a Frame Relay point - to - point subinterface, has the lower RID and lower subinterfa ce IP address, and otherwise uses default OSPF configuration on the interface.

D. When OSPF is enabled on a working LAN interface on a router, and the router has been elected BDR.

E. None of the other answers is correct.

A. They are originated by Area Border Router and are sent into a single area to advertise an Autonomous System Border Router.

B. They are originat ed by Area Border Routers and are sent into a single area to advertise destinations outside that area.

C. They are originated by the DR on every multi - access network. They include all attached routers including the DR itself.

D. They are originated by every router in the OPSF network. They include all routers on the link, interfaces, the cost of the link, and any known neighbor on the link.

输入哪条命令可以看到以下信息?（ ） LS DataBase Type :Router Ls id :10.1.2.2 Ady rtr :1050 Len :72 Seq :80000008 Cksum (DC) Area Border Router Link count 4 Link id :192.168.2.1 Data :255.255.255.255 Metric:1562 Link id :10.1.2.2 Data :10.1.3.1 Type :Router Metric :1562 Link id :10.1.3.2 Data :255.255.255.255 Type :StubNet Metric :1562

A.show ip route

B.show ip ospf isa

C.show ip ospf database

D.show ip ospf interface

A.生成这条LSA的路由器的Router ID

B.所描述网段上的DR的端口的IP地址

C.所描述的目的网段

D.所描述的ABR的Router ID

A.It is used for type 1 router LSA

B.Highest IP address of the loopback is used

C.router-id needs to be matched on ospf neighbors

D.router-id is 16 bit

A. Areas introduce a boundary on the link - state updates.

B. Areas are logical definitions specific to any given router.

C. All routers within an area have the exact link - state database.

D. The calculation of the Dijkstra algorithm on a router is limited to changes within an area.

E. The area designated router will always have a priority of 0.

Refer to the exhibit. During the process of configuring a virtual link to connect area 2 with the backbone area, the network administrator received this console message on R3:*Mar 1 00:2 5:01.084: %OSPF -4- ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual link but not found from 20.20.20.1, Serial 0 .How should the virtual link be configured on the OSPF routers to establish full connectivity between the areas?（）

A.R1(config - router)# area 0 virtual - link 1.1.1.1R3(config - router)# area 2 virtual - link 3.3.3.3

B.R1(config - router)# area 1 virtual - link 2.2.2.2 R3(config - router)# area 1 virtual - link 2.2.2.2

C.R1(config - router)# area 1 virtual - link 20.20 .20.2 R3(config - router)# area 1 virtual - link 30.30.30.2

D.R1(config - router)# area 1 virtual - link 30.30.30.3 R3(config - router)# area 1 virtual - link 20.20.20.1

E.R1(config - router)# area 1 virtual - link 3.3.3.3 R3(config - router)# area 1 virtual - link 1.1 .1.1

Examine the following excerpt from the show ip ospf database asbr -summary command on router R1 (RID 1.1.1.1). Which answer can be verified as definitely true based on this output?（）LS Type: Summary Links (AS Boundary Router)Link State ID: 9.9.9.9 (AS Boundary Router address)Advertising Router: 3.3.3.3LS Seq Number: 8000000DChecksum: 0xE43ALength: 28Network Mask: /0TOS: 0 Metric: 100

A. The output describes the contents of a Type 5 LSA

B. 3.3.3.3 identifies a ro uter as being the router performing redistribution

C. R1‘s metric for its best route to reach the router with RID 9.9.9.9 is 100

D. The router with RID 3.3.3.3‘s metric for its best route to reach the router with RID 9.9.9.9 is 100

A.LS type，Link StateID和Advertising Router的组合共同识别一条LSA

B.LS type，Linke StateID和LS se quence number的组合共同识别一条LSA

C.LS type，LS se quence numbe和Advertising Router的组合共同标识一条LSA

D.LS se quence number，Link State ID和Advertising Router的组合共同标识一条LSA

A.Type表示连接的类型

B.Link ID表示此连接的本地标识，不同的链接类型Link ID表示的意义也不相同

C.Data用于描述此连接的附加信息，不同的连接类型所描述的信息也不同

D.Metric描述此连接的开销