甲携带邻居6岁小孩进入山林中狩猎。两人在林中失散，甲继续独自行猎，既不寻找小孩，也没返村告知小

Routers R1 and R2, OSPF neighbors in area 0 over their Fa0/0 interfaces (respectively), currently both successfully use OSPF MD5 authentication. The OSPF configuration includes the area 0 authentication command under the router ospf 1 command.Which of the following commands must have been configur ed on R1‘s Fa0/0 interface？（）

A. ip ospf authentication null

B. ip ospf authentication message - digest

C. ip ospf authentication -key whatever- it - is

D. ip ospf message - digest - key 1 md5 whatever - it - is

E. ip ospf md5 1 key whatever - it - is

A. Router R1 will only establish full adjacency with the DR and BDR on broadcast multi- access networks.

B. Router R2 has been elected as a DR for the broadcast multiaccess network in OSPF area 1.

C. Routers R1 and R2 are configured as stub routers for OSPF area 1 and OSPF area 2.

D. Router R1 and R2 are configured for a virtual link between OSPF area 1 and OSPF area 2.

E. The Hello parameters on routers R1 and R2 do not m atch.

our other working OSPF routers in that subnet. R1 is neither the designated router (DR) nor backup DR (BDR). OSPF is working correctly on all five routers.Which of the following is true on R1？（）

A. The show ip ospf neighbors command lists two neighbors off Fa0/0.

B. The show ip ospf neighbors command lists four neighbors off Fa0/0.

C. The show ip ospf neighbors command lists two neighbors off Fa0/0 in the FULL state.

D. The show ip ospf neighbors command lists two neighbors off Fa0/0 in the DISCO state.

eer adds the ip hello - interval eigrp 9 6 command to R1‘s Fa0/0 configuration.Which of the following is true regarding the results from this c hange？（）

A.The show ip eigrp neighbors command on R1 lists the revised Hello timer

B.The show ip eigrp interfaces command on R1 lists the revised Hello timer

C.The R1 - R2 neighborship fails due to Hello timer mismatcH

D.The show ip eigrp interfaces detail command on R1 lists the revised Hello timer

A. The Hello packets will be exchanged and adjacency will be established between routers R2 and R5.

B. The Hello packets will be exchanged but the routers R2 and R5 will become neighbors only.

C. The Hello packets will be dropped and no adjacency will be established between routers R2 and R5.

D. The Hello packets will be dropped but the routers R 2 and R5 will become neighbors.

1 and I2 used at th e ISPs. R1 peers with I1 and R2; R2 peers with I2 and R1. R1 and R2 do not share a common subnet, relying on other routers internal to the Enterprise for IP connectivity between the two routers.Which of the following could be used to prevent potential routing loops in this design？（）

A. Using an iBGP mesh inside the Enterprise core

B. Configuring default routes in the Enterprise pointing to both R1 and R2

C. Redistributing BGP routes into the Enterprise IGP

D. Tunneling the packets for the i BGP connection between R1 and R2

and R2 have PVCs connected to all other routers, but Routers R3 through R10 act as branch routers, with only two PVCs - one to R1 and one to R2. The routers u se IP subnet 10.1.1.0/24, with addresses 10.1.1.1, 10.1.1.2, and so on, through 10.1.1.10, respectively. The routers all use Inverse ARP to learn Frame Relay mapping information. All routers use a multipoint subinterface with network type point - tomultip oint nonbroadcast. A co - worker‘s implementation plan lists lots of configuration commands related to this design. The design states that all hosts should be able to ping all other hosts.Which commands are required for proper functioning of OSPF in this case？（）

A. frame - relay map commands on R3 - R10 referencing the other routers in this group

B. Nine OSPF neighbor commands on each router

C. Nine OSPF neighbor commands on R1 and R2, with only two such commands on R3 - R10

D. R1 and R2 with ip ospf prio rity 1 commands to ensure they become DR and BDR

E. R3 - R10 with ip ospf priority 0 commands to ensure they do not become DR or BDR

Routers R1 and R2, currently EIGRP neighbors over their Fa0/0 interfaces (respectively),both use EIGRP authentication. Tuesday at 8 p.m. the neighborship fails.Which of the following wo uld not be useful when investigating whether authenticationhad anything to do with the failure？（）

A. debug eigrp packet

B. show key chain

C. show ip eigrp neighbor failure

D. show clock

Refer to the exhibit. All routers have Protocol Independent Multicast (PIM) enabled interfaces. On the basis of the configuration provided on routers R1 and R2, which router will take on the func tion of rendezvous point (RP) for the multicast network？ （）

A. both routers R1 and R2

B. router R1

C. router R2

D. none of the routers since they are not configured with static RP

e routers cannot establish an adjacency relationship on their common Ethernet link. The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2. Based on the information in the graphic, what is the cause of this problem？（）

A. The OSPF area is not configured properly.

B. The priority on R1 should be set higher.

C. The cost on R1 should be set higher.

D. The hello and dead timers are not configured properly.

E. A backup designated router needs to be added to the network.

F. The OSPF process ID numbers must match.