A network administrator must configure router B to allow traffic only from network 10.100.2.0 to networks outside of router B. Which configuration must be applied?
A.
RouterB(config)# access-list 101 permit ip 10.100.2.0 0.0.0.255 any RouterB(config)# access-list 101 deny any
RouterB(config)# int g0/0/0 - RouterB(config-if)# ip access-group 101 out
B.
RouterB(config)# access-list 101 permit ip 10.100.3.0 0.0.0.255 any RouterB(config)# access-list 101 deny any
RouterB(config)# int g0/0/0 - RouterB(config-if)# ip access-group 101 out
RouterB(config)# int g0/0/1 - RouterB(config-if)# ip access-group 101 out
C.
RouterB(config)# access-list 101 permit ip 10.100.2.0 0.0.0.255 any RouterB(config)# access-list 101 deny any
RouterB(config)# int g0/0/2 - RouterB(config-if)# ip access-group 101 in
D.
RouterB(config)# access-list 101 permit ip 10.100.2.0 0.0.0.255 any
RouterB(config)# int g0/0/0 - RouterB(config-if)# ip access-group 101 out
RouterB(config)# int g0/0/1 - RouterB(config-if)# ip access-group 101 out
A - WRONG. destination is missing an 'any' and it only affect traffic to 1 external network.
B - WRONG. wrong network souce and missing 'any' and only affect traffic to 1 external network.
C - WRONG. Select the best interface for this scenario, however, it's missing an 'any'; it it only had this missing any, would've been the best choice.
D - Correct. Correct network sources, implicit deny takes care of the rest. Interfaces are ok in the out direction.
Interface gi 0/0/3 is a directly connected interface of router B, and thus the network "10.100.3.0/24" is an inside network. No need to apply any sort of filtering on this interface. We have 2 exit interfaces g 0/0/0 & g 0/0/1 to reach external networks. Option 'D' ensures that only network 10.100.2.0 can send traffic out of these 2 interfaces.
C looked ok, but the ACL's deny component should be "deny ip any any". D's ACL carries the explicit deny, so it's correct
upvoted 4 times
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