ACL Overview

ACL overview: ACL (Access Control List) is a popular method to filter packets based on predefined rules. Admin first specifies access rules. Then apply the ACL to an interface at In or Our direction. Rules are permit/deny actions with respect to IP addresses, protocol type, or ports.
There are three types of ACL: Standard, Extended, and Named. Standard ACL specifies permit/deny for packet destination address only. Extended ACL filter includes IP source address, protocol, and ports. Named ACL allows admin to modify ACL statements (Numbered ACL does not allow modification.)

Visual land's CCNA ACL tutorials: Visual Land offers 4 ACL tutorials for CCNA.

Vlab (Virtual Network Lab) includes animation, lab, and router configuration files (for selected labs.
Animation: Packets are moving on topology, routers are rendered with state table, configuration window, and bubbles. Packet headers are displayed in pcap format when mouseover. Animations are created by Visualland's tool AE (Animation Editor). Data are injected from simulation (dynamips, ns2), verified by simulation (dynamips, packet tracer), or manually crafted by authors.
Lab configuration file. Router configuration files from labs can be downloaded. Learners can use the configuration to recreate the effect show in the animation. I other word, animation becomes a Lab Notebook.
Table of content

ACL basic It illustrates how ACL permit and deny packet flows. It visualizes router's action to ACL statement, and packet behaviors.
Extended ACL Animate ACL extended features such as source IP address, protocol, port. 的
Named ACL Only named ACL allows statement modification (Numbered ACL does not allow modification.
ACL wildcard. It visualizes wildcard to permit and block neighboring subnets. It also shows how to use binary to filter.

References

Cisco Access Control Lists http://www.simulationexams.com/tutorials/ccna/Cisco-access-control-lists.htm
Cisco Ccna Simulator http://www.filebuzz.com/files/Cisco_Acl_Simulator/1.html