You have a Level 1-only router （Router A） in IS-IS area 49.0

A. only summarized routes

B. all routes in the network

C. all routes in the backbone

D. No routes are advertised.

A. You can reach other Level 2 routers.

B. It can reach at least one other defined area.

C. The router is reachable by at least two ES-IS nodes.

D. It has at least one enabled reachable prefix with a valid metric defined.

某园区网采用OSPF路由协议，参与OSPF的网络地址是169.111.0.0/16 Cisco路由器的正确配置是

A．Router (config) #router ospf 63 Router (config-router) #network 169.111.0.0 0.0.0.0 area 0 Router (config-router) #area 0 range 169.111.0.0 255.255.0.0

B．Router (config) #router ospf 63 Router (config-router) # network 169.111.0.0 255.255.0.0 area 0 Router (config-router) #area 0 range 169.111.0.0 255.255.0.0

C．Router (config) #router ospf 63 Router (config-router) #network 169.111.0.0 0.0.255.255 area 0 Router (config-router) #area 0 range 169.111.0.0 255.255.0.0

D．Router (config) #router ospf 63 Router (config-router) #network 169.111.0.0 0.0.255.255 area 0 Router (config-router) #area 0 range 169.111.0.0 0.0.255.255

A.The router is in area 49.0001.0002

B.The router acts as a Level 1 - 2 router

C.CLNS routing is enable d for the router

D.The router has a system ID of 0003.0004

E.The interfaces have a functional IS - IS configuration

F.The network service access point selector (NSEL) byte has a value of 0

A. Have a backbone area (area 0) with 40 routers and use default routes to reach external destinations

B. Have a backbo ne area (area 0) with 4 routers and 30,000 external routes injected into OSPF

C. Have less OSPF areas to reduce the need for interarea route summarizations

D. Have multiple OSPF processes on each OSPF router. Example, router ospf 1, router ospf 2

There are three routers on a Gigabit Ethernet LAN: Router A, Router B, and Router C. Router A is the Designated Intermediate System (DIS) at Level 1 for that LAN. Router A‘s DIS priority is 64. The LAN is a Level 1-only link. Router D has just been powered up on that same LAN and its DIS priority is 80.Which statement is true?（）

A. Router A remains the DIS and generates a new pseudonode LSP for that LAN

B. Router A remains the DIS and NO new pseudonode LSP is generated for that LAN

C. Router D becomes the new DIS, generates a new pseudonode LSP for that LAN, and purges the old pseudonode LSP generated by Router A

D. Router D becomes the new DIS, does NOT generate a new pseudonode LSP for that LAN, and does NOT purge the old pseudonode LSP generated by Router A

A. Router A must have a Level 2 adjacency with the Level 1/Level 2 router in area 49.0001.

B. The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 1 link-state PDU (LSP) it floods into area 49.0001.

C. The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 2 LSP it floods into area 49.0001.

D. The Level 1/Level 2 router in area 49.0001 advertises these prefixes into area 49.0001 using a Level 2 LSP it floods into the area.

An IS-IS router is adjacent to and passing traffic with a neighbor. You perform a show isis interface detail command and notice that for some interfaces you have a circuit type of 3. Which IS-IS level(s) is enabled on these interfaces?（）

A. Level 1 only

B. Level 2 only

C. Level 1 and Level 2

D. Level 3 only

Refer to the exhibit. You have completed an OSPF implementation, and you are verifying OSPF operation. You notice that router A and router B are stuck in the two - way state. From the show ip ospf interface command output, what is the cause of this issue?（）

A. All OSPF implementations must have at le ast one interface in area 0.

B. You are attempting to run in the broadcast mode over an NBMA interface.

C. Both routers are configured to function as a BDR; therefore, there is no DR router.

D. Someone has changed the OSPF router ID; therefore you must clear the OSPF process.

E. The OSPF priority is set to 0 on both routers; therefore neither can become the DR.