Filter ICMP traffic in the Cisco IOS

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While ICMP is required for IP network traffic redirection and pinging hosts on your LAN or WAN, ICMP can also pose a security concern. David Davis tells you about the basics of ICMP and how to filter it properly in the Cisco IOS. [Read More] Posted By: David Davis on 05/15/2008 @ 01:24:38 PM in Network Administrator

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Configuring the Cisco 851W or 871W: Standard IOS

This tutorial by George Ou and Justin James shows you how to set up an advanced SOHO configuration for the Cisco 851W router. [Read More] Posted By: George Ou on 07/03/2008 @ 12:54:28 PM in Network Administrator

How to properly secure your Cisco router with passwords

Some of the worst security breaches occur because people neglect basic security measures. David Davis discusses the importance of maintaining proper passwords on your router, explains the three modes for the Cisco IOS, and shows you how to configure the five main passwords that protect your network. [Read More] Posted By: David Davis on 06/26/2008 @ 09:26:38 AM in Network Administrator

Understand the levels of privilege in the Cisco IOS

The Cisco IOS actually offers 16 different privilege levels. David Davis discusses these different levels and introduces you to the main commands you'll need to configure these privileges. [Read More] Posted By: David Davis on 06/20/2008 @ 06:46:06 AM in Network Administrator

Cisco Administration 101: Understand the OSI model to become a better Cisco troubleshooter

David Davis explains how the seven layers of the OSI Model can help you as a Cisco administrator. Get a brief overview of the OSI model and learn why it is more than just a textbook concept -- understanding it will help you every day of your career. [Read More] Posted By: David Davis on 06/20/2008 @ 06:44:21 AM in Network Administrator

10 commands you should master when working with the Cisco IOS

Becoming proficient with the Cisco IOS means learning some essential commands. This quick reference describes 10 commands you'll need to rely on when handling various configuration and troubleshooting tasks. [Read More] Posted By: David Davis on 06/13/2008 @ 06:33:11 AM in Network Administrator

Troubleshoot Cisco routers and switches using the debug commands

David Davis shows you how to get to the bottom of router and switch issues with Cisco's debug commands. Debug can give you a lot of detailed troubleshooting information, but watch out for the debug mistakes that can seriously affect your network. [Read More] Posted By: David Davis on 06/12/2008 @ 09:59:56 AM in Network Administrator

What you need to know about Cisco IOS access-list filtering

Cisco IOS ACLs are difficult to use. You can unwittingly create havoc on your network if you don't know some of the basic rules. David Davis focuses on the role of ACLs in packet filtering and tells you what you must know in order to make them work for you. [Read More] Posted By: David Davis on 06/05/2008 @ 08:02:47 AM in Network Administrator

Use the Cisco IOS archive command to archive your router's configuration

David Davis introduces the Archive command in Cisco, which you can configure to log all commands on your router. If you need to back up to a previous configuration, or see what went wrong after a change, the Archive command will help you find your way. [Read More] Posted By: David Davis on 05/29/2008 @ 08:32:33 AM in Network Administrator

How to perform a Cisco IOS warm upgrade and reload to minimize downtime

David Davis explains how to perform a warm upgrade and warm reload in the Cisco IOS. Using these Cisco features significantly reduces downtime when you have to upgrade or reboot your router. [Read More] Posted By: David Davis on 05/22/2008 @ 06:49:22 AM in Network Administrator