R1 is currently advertising prefixes 1.0.0.0/8, 2.0.0.0/8, and 3.0.0.0/8 over its eBGP con

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

A.R3,R4,R6

B. R2,R3,R6,R7

C. R1 through R8

D. R3,R4,R5,R6

E. R2,R3,R4,R6,R7

ut from Router R1？（）R1show ip ospf virtual - linksVirtual Link OSPF_VL0 to router 4.4.4.4 is upRun as demand circuitDoNotAge LSA alloweD.Transit area 1, via interface FastEthernet0/1, Cost of using 3

A. R1 is configured with an area 0 virtual - link 4.4.4.4 cost 3 command.

B. The ping 4.4.4.4 command on R1 must currently be successful.

C. R1‘s Fa0/0 OSPF cost is 3.

D. 4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.

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

ion exists in a planning document, intended to be used to copy/paste into Router R1 to enable RIPng and IPv6 on interfaces F0/0 and S0/0/0. No other related configuration exists. Which of the following is true about RIPng on R1 after this configuration has been pasted into R1？（）ipv6 unicast- routinginterface f0/0ipv6 rip one enableipv6 address 2000::1/64interface s0/0/0ipv6 address 2001::/64 eui - 64ipv6 rip one enable

A. RIPng will be enabled on no interfaces.

B. RIPng will be enabled on one interface.

C. RIPng will be enabled on two interfaces.

D. RIPng will advertise about prefixes connected to S0/0/0 and F0/0, but only send Updates on one interface.

of 10.10.10.1/24, 10.10.11.2/24, and 10.10.12.3/22. R1‘s configuration includes the command s router eigrp 9 and network 10.0.0.0. The show ip eigrp interfaces command lists S0/0 and S0/1 in the command output, but not S0/2.Which answer gives the reason for the omission？（）

A. R1 has EIGRP neighbors reachable via S0/0 and S0/1, but not via S0/2, so it is not included.

B. S0/2 may currently be in a state other than up/up.

C. The network 10.0.0.0 command requires the use of mask 255.0.0.0 due to EIGRP being classful by default.

D. S0/2 may be configured as a passive inter face.

A. The router will prefer the next hop of 172.16.1.1 for packets destined for the 192.168.1.0 network.

B. The router will prefer the next hop of 172.26.1.1 for packets destined for the 192.168.1.0 network.

C. The router will adve rtise the 192.168.1.0 network only to 172.30.1.1.

D. The router will advertise the 192.168.1.0 network only to 172.26.1.1.

E. The router will prefer the next hop of 172.26.1.1 for packets except those destined for the 192.168.1.0 network.

David () on a new database at the moment.

A. currently work

B. is currently working

C. currently working

A. FREE_SPACE indicates only the space that is currently unallocated.

B. ALLOCATED_SPACE indicates only the space currently allocated and in use.

C. FREE_SPACE indicates only the space that is currently allocated and available for reuse.

D. ALLOCATED_SPACE indicates both the space currently allocated and used, and the space that is available for reuse.

E. FREE_SPACE indicates both the space that is currently allocated and available for reuse, and the space that is currently unallocated.