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Access Control List (7.1.1Purpose of ACLs (7.1.1.3 ACLs operation (Inbound…

- - - - In the first example the wildcard mask stipulates that every bit in the IPv4 192.168.1.1 must match exactly.
      - In the second example, the wildcard mask stipulates that anything will match.
      - In the third example, the wildcard mask stipulates that any host within the 192.168.1.0/24 network will match.
    - - Working with decimal representations of binary wildcard mask bits can be tedious. To simplify this task, the keywords host and any help identify the most common uses of wildcard masking. These keywords eliminate entering wildcard masks when identifying a specific host or an entire network.
- - - - use the show running-config command to display the ACL, copy and paste it into the text editor, make the necessary changes, and paste it back in to the router interface.
    - - Step 1. Display the current ACL using the show access-lists 1 command.
      - Step 2 : Enter the ip access-lists standard command that is used to configure named ACLs.
      - Step 3 :Verify the changes using the show access-lists command.
    - - In the first show command output, you can see that the ACL named NO_ACCESS has two numbered lines indicating access rules for a workstation with the IPv4 address 192.168.11.10.
      - From named access list configuration mode, statements can be inserted or removed.
      - To add a statement to deny another workstation requires inserting a numbered line
      - The final show command output verifies that the new workstation is now denied access