Access Control List (ACL): Differences between Standard ACL and Extended ACL

• It is a Layer 3 security which controls the flow of traffic from one router to another.
• It is also called as Packet Filtering Firewall.

Types of ACL

• Standard ACL
• Extended ACL
• Named ACL

Standard Access List

• The access-list number lies between 1 - 99.
• Can block a Network, Host and Subnet.
• Two-way communication is stopped.
• All services are blocked.
• Implemented closest to the destination.

Extended Access List

• The access-list number lies between 100 - 199.
• Can block a Network, Host, Subnet and Service.
• One-way communication is stopped.
• Selected services can be blocked.
• Implemented closest to the source.

Named ACL

Named ACL