Continue your lesson
Tie every forwarding decision to interface state, Layer 2 state, addressing, routing, and policy.
Block 1 of 2Compare Standard IPv4 ACL · ACL wildcard mask · Implicit deny
Current · 17 min
Compare Standard IPv4 ACL · ACL wildcard mask · Implicit deny
Optional concept notes
Standard IPv4 ACL
Filters IPv4 packets primarily using their source address.
ACL wildcard mask
Uses zero bits to require matches and one bits to ignore positions.
Implicit deny
Rejects unmatched traffic after the final explicit ACL entry.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Block 2 of 2Understand Extended IPv4 ACL
12 min
Understand Extended IPv4 ACL
Optional concept notes
Extended IPv4 ACL
Filters by protocol source destination and transport-layer details.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Practice the reasoning here
Write or inspect a small Cisco configuration, name the expected show-command evidence, and explain how a frame or packet crosses it.
- State the expected result before changing or testing anything.
- Name the observation, command, log, or report that would confirm it.
- Explain why the closest alternative does not fit the same requirement.
Check the whole objective
This unlocks objective 5.6 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.