What are the two main types of access control lists (ACLs) used in router…
2024
What are the two main types of access control lists (ACLs) used in router configuration?
1. Standard
2. IEEE
3. Extended
4. Specialized
- A.
1 and 3
- B.
2 and 4
- C.
3 and 4
- D.
1 and 2
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Correct answer: A
An access control list (ACL) configured on a router is a rule set that permits or denies traffic. IP ACLs are classified into exactly two functional types: Standard ACLs, which filter traffic using only the source IP address, and Extended ACLs, which additionally filter by destination IP address, protocol, and port number for much finer control.
Among the four listed items, item 1 (Standard) and item 3 (Extended) are exactly these two ACL types — so the pairing “1 and 3” identifies the two main kinds of ACL.
The other two items don't fit this classification:
Item 2, IEEE, is a standards body that defines networking protocols (such as Ethernet 802.3 and Wi-Fi 802.11) — it is not a category of ACL at all.
Item 4, Specialized, is not a recognised ACL classification in router configuration; no vendor documentation defines such a category alongside the two standard types.
Cisco IOS access-list documentation and standard networking curricula consistently describe only these two IP ACL types, confirming the pair “1 and 3” as the correct classification.