How to Troubleshoot OSPF?

OSPF is one of our more complicated routing protocols, and it can be pretty intimidating, especially at first. But once you have mastered how to configure this Link State Protocol, the first thing you realize is that it is built…

OSPF is an interior gateway protocol that routes Internet Protocol (IP) packets solely within a single routing domain (autonomous system). It gathers link state information from available routers and constructs a topology map of the network. The topology determines the…
How to Upgrade Cisco 2950 Switch?

While many of you may be familiar with Cisco router upgrades, upgrading the IOS on a Catalyst 2950 switch is different. It uses a few different commands, and the IOS and other files come compressed in a .tar file. Let’s…
How to Configure Cisco PIX Firewall?

How to configure a new PIX firewall? You will need to will configure passwords, IP addresses, network address translation (NAT) and basic firewall rules. If you have a new PIX firewall that has never been configured, it will need to…

Interface configuration is one of the most important configurations of the switch. Without interfaces, the switch is useless. Interface configurations must be exact to be able to communicate with other devices. Interface configuration will be presented for three different devices…
How to Protect Router Password?

Administrators can access a router for administrative purposes in a variety of ways. For example, as shown in Figure 3-2, a PC running terminal emulation software can telnet into a router. The Telnet connection is considered to be using a…