B is correct,
Explanation:
ACL 100 and 101: Both ACLs permit TCP traffic on port 22, which is necessary for SSH access. While it’s redundant to have two ACLs doing the same thing, they both allow SSH traffic.
Class-map: The class-map correctly matches Access-group 101, enabling traffic that matches this ACL to be processed by the subsequent policy-map.
I agree with danman32, matching SSH on ACL 100 doesn't make sense as it would match both telnet and SSH in the telnet class-map. I think the router would even ignore the ssh class-map if it was below the telnet class-map in the policy-map.
B is correct,
Explanation:
ACL 100 and 101: Both ACLs permit TCP traffic on port 22, which is necessary for SSH access. While it’s redundant to have two ACLs doing the same thing, they both allow SSH traffic.
Class-map: The class-map correctly matches Access-group 101, enabling traffic that matches this ACL to be processed by the subsequent policy-map.
Why is there an entry for access-list 100 in B and C?
Access-list 100 will have no effect on the newly created class-map, but could break the existing class-map.
The difference is in the beginning access list statements.
A - access-list 10 is wrong because standard access lists only support source address and mask. They don't support adding destination addresses, masks or source and destination ports.
B - access-list 100 is right because this is an extended access list and extended access lists support source and destination addresses and masks and also source and destination ports.
Standard access lists - 1-99
Extended access lists - 100-199
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