Last Updated on November 23, 2020 by Admin
Refer to the exhibit. A network administrator needs to add an ACE to the TRAFFIC-CONTROL ACL that will deny IP traffic from the subnet 172.23.16.0/20. Which ACE will meet this requirement?
- 15 deny 172.23.16.0 0.0.15.255
- 30 deny 172.23.16.0 0.0.15.255
- 5 deny 172.23.16.0 0.0.255.255
- 5 deny 172.23.16.0 0.0.15.255
Answers Explanation & Hints:
The only filtering criteria specified for a standard access list is the source IPv4 address. The wild card mask is written to identify what parts of the address to match, with a 0 bit, and what parts of the address should be ignored, which a 1 bit. The router will parse the ACE entries from lowest sequence number to highest. If an ACE must be added to an existing access list, the sequence number should be specified so that the ACE is in the correct place during the ACL evaluation process.