Troubleshooting ACLs and Prefix Lists
6 important questions on Troubleshooting ACLs and Prefix Lists
What are 3 important rules for the processing of an IPv4 ACL
- Top-down processing
- Immediate execution upon a match
- Implicit deny any
What is the big difference between a Standard IPv4 ACL and an Extended IPv4 ACL?
- Standard ACL uses the format
sequence Deny | Permit ip-address wildcard bits wildcard-bits - Extended ACL can use various other filters like:
Protocol, src subnet, dst subnet, host, port
IPv6 ACL processing is different from IPv4. What are the 4 steps in IPv6 ACL processing?
- Top-down processing
- immediate execution upon a match
- implicit permit icmp nd (NA or NS messages are permitted)
- implicit deny any
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What types of ACLs can be created for IPv6?
What are the 3 steps of Prefix List processing?
- Top-down processing
- Immediate execution upon a match
- implicit deny any
What is the difference between prefix list entries with GE or LE and without them?
- Without the Ge or Le option the entry is treated as an address and subnet mask. Only exact matches will be matched.
- With the Ge or Le option the entry is treated as an address and wildcard mask. The Ge or Le option indicate the subnet masks that match the entry.
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