Anyone have any suggestions on how to learn ACL's?
gbdavidx
Member Posts: 840
in CCNA & CCENT
ACLs seem to be a pain in the ass, anyone have any suggestions on how to learn them? Is it just practice like subnetting?
Comments
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RouteMyPacket
Member Posts: 1,104
Modularity and Design Simplicity:
Think of the 2:00 a.m. test—if you were awakened in the
middle of the night because of a network problem and had to figure out the
traffic flows in your network while you were half asleep, could you do it? -
lsud00d
Member Posts: 1,571
RouteMyPacket wrote: »
This is a good link, thanks RMP!
I was actually super sleuthing an issue today on a SAN switch and it's extended ACL's...I deduced what the WCM was doing but never knew exactly what it was. Hooray for learning new things
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gbdavidx
Member Posts: 840
How do you know where to apply the access list? For example, Network simulator: Router Access List Configuration why would you apply that to S0 and not on the other side of the Router 3? or applied going out?
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late_collision
Member Posts: 146
You've asked a good question, and for the most part, I think it's a bit of a poor example. I believe the clue lies in step 2(b) " All hosts on the subnet as Bret should not be able to access hosts connected to R3." If additional hosts were added to another interface off of R3 and we applied the ACL outbound on the port facing network 214.47.8.0, the conditions of the question would not be satisfied.
But again, these are all what-if's, and when you play the game, the integrity of the question is jeopardized.
I've always hated ACL questions, they all seem fuzzy at best.