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Refer to the exhibit. Which AS paths are matched by this access list?
Correct Answer: C
Explanation/Reference: Explanation: If you want AS 1 to get networks originated from AS 4 and all directly attached ASs of AS 4, apply the following inbound filter on Router 1. ip as-path access-list 1 permit ^4_[0-9]*$ router bgp 1 neighbor 4.4.4.4 remote-as 4 neighbor 4.4.4.4 route- map foo in route-map foo permit 10 match as-path 1 In the ip as-path access-list command, the carat (^) starts the input string and designates "AS". The underscore (_) means there is a a null string in the string that follows "AS 4". The [0-9]* specifies that any connected AS with a valid AS number can pass the filter. The advantage of using the [0- 9]* syntax is that it gives you the flexibility to add any number of ASs without modifying this command string. Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13754- 26.html