"If you are working on routers/switches running IOS it might be better to look for a different tutorial since a lot of this one won't apply."
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Sorry, my bad - Brad Reese
CTT-TAC: IP Routing Access Lists
Learn how to configure access lists in an IP routing environment. You will also do hands-on Configuration Labs, and a Challenge Lab to test your troubleshooting knowledge.
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Standard Access Lists
To create a standard access list, use one of the following commands in the global configuration mode.
( global configuration mode: The EXEC mode in the Cisco IOS software in which you can enter configuration commands and access all configuration sub modes. )
Command
access-list access_list_# {deny|permit} source [source_wildcard] [log]
Purpose
Define a standard IP access list using a source IP address and wildcard mask.
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Command
access-list access_list_# {deny|permit} any [log]
Purpose
Define a standard IP access list using an abbreviation for the source and source mask of 0.0.0.0 255.255.255.255
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The wildcard mask is essentially the inverse of the regular mask.
For example, if we wanted to permit any IP packets that are sourced from subnet 172.16.10.0 255.255.255.0, we could create the following access list:
access-list 1 permit 172.16.10.0 0.0.0.255 Notice that the wildcard mask in the access list is the inverse of the mask for the subnet. In a wildcard mask, the "zero" bits are important and the "one" bits are ignored. In the above access list, any IP packet sourced from 172.16.10.x would match the access list and, therefore, be permitted.
A packet sourced from any other source would be denied, because of the implicit "deny all" at the end of the access list.
If we wanted to permit only IP packets sourced from the specific host address 172.16.10.177 255.255.255.255, the access list would look like this:
access list 1 permit 172.16.10.177 0.0.0.0 Note: If you omit the wildcard mask from an associated IP host address in an access list, 0.0.0.0 is assumed to be the mask.
The log keyword at the end of the command allows the Cisco IOS software to provide logging messages about packets that are permitted or denied by a standard access list.
The first packet that matches the access list will cause an informational console message to appear immediately. Subsequent packets are collected over five-minute intervals before they are displayed or logged.
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CTT-TAC: Introduction to Routing and Access Lists
Introduces the routing protocols: Routing Information Protocol (RIP) and Interior Gateway Routing Protocol (IGRP), and teaches the basics of access lists. It is accompanied by a series of labs designed to enhance the concepts being explained.
IP Access Lists Introduction Creating Access Lists with Numbers Creating Access Lists with Names Creating Time-Based Access Lists Commenting Access Lists Access-List Applications Controlling Content of Routing Updates Determining Address Translation with Dynamic NAT
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Once more, sorry my bad.
Brad Reese Cisco Repair
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