it's a ACL a layer 4 transport layer protocol ?
yrwins
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in CCNA & CCENT
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fearlessfreap24
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I believe an ACL resides in Layer 3. A normal ACL can block a host or block of IP address which are layer 3. An Extended ACL can block a protocol but still uses IP address to do so.
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james43026
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From a network point of view, an ACL can go up to layer 4, if we are talking about extended ACL's.
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NiceRoute
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If it can block logical ports, then it can be referred to as working at layer 4.
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OctalDump
Member Posts: 1,722
No. An ACL is not a protocol. Cisco ACLs can modify the behaviour of traffic from layer 2 up. Typically at CCNA level you deal with ACLs that modifying traffic at layer 3 and 4. Eg, block all traffic from this IP (layer 3), or allow access to only these ports (layer 4) at this IP.2017 Goals - Something Cisco, Something Linux, Agile PM
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TheFORCE
Member Posts: 2,297 ■■■■■■■■□□
No. An ACL is not a protocol. Cisco ACLs can modify the behaviour of traffic from layer 2 up. Typically at CCNA level you deal with ACLs that modifying traffic at layer 3 and 4. Eg, block all traffic from this IP (layer 3), or allow access to only these ports (layer 4) at this IP.
About to say that, ACL's are not protocols. You can have ACL is many different type of devices. -
Cisco Inferno
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standard ACL's block L3 traffic based on IP address. Extended ACL's can filter things based on L4 Port info on top of that.
ex. Blocking Port 80 web traffic to a specific subnet. (like a kiosk pc or something)2019 Goals
CompTIA Linux+[ ] Bachelor's Degree
