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Archive for the 'CCENT (ICND1)' Category

Speed and Duplex configuration

Monday, August 10th, 2009

Although the configuration of both of these functions is incredible easy, the concept behind them is somewhat important.   Duplex defines how traffic will be sent and can be related to a 2-way radio vs. A telephone. With a 2-way radio, more so when there are more than 2 people on the same radio frequency, [...]

Port Security on a Cisco Switch

Thursday, August 6th, 2009

In order to control what machines are plugged into your network, Cisco introduced the “switchport port-security” command.   In this tutorial I’m going to explain how to use this command, and different options available using it.   Below is the breakdown of the commands I used in the live demo, and an explanation of each. [...]

Configuring an IP address and Default-Gateway on a Cisco Switch

Monday, August 3rd, 2009

The configuration of an IP address on a switch is slightly different from a router. On a router we configure the IP address on the physical interface, however on a switch the physical interfaces are running at Layer 2 and hence don’t have IP addresses configured on them.   Even though a switch does not [...]

Restoring Cisco Router Configuration

Wednesday, July 29th, 2009

In the event that you have lost the configuration on your Cisco device, restoration is straight forward assuming of course you had made a backup. There are 2 ways to restore the configuration to put our device back to normal                   1/ Copy and paste the backup configuration directly to the device                 2/ [...]

Upgrading the IOS on a Cisco Router

Tuesday, July 28th, 2009

Cisco brings out new versions of the operating system quite frequently, and of course there are different versions of the operating system for each of the appliances. Different IOS’s will support different commands and different features and it’s not uncommon to have to change the IOS that your device is running to support commands you [...]

Backing Up the Running-Config and IOS

Monday, July 27th, 2009

The first and most important rule in IT, is “Backup soon, Backup often!” It’s a logical statement but sadly one that many people only truly appreciate when it’s too late!   Two of the most important files on a Cisco router are the Running-Config which stores the current configuration of your router, and the IOS [...]

Clock rate and Bandwidth commands

Thursday, July 16th, 2009

Two commands which are often confused or misunderstood, are the clock rate and bandwidth commands. In order to understand clock rate we first need to understand how the cabling works on routers. When connecting two routers together with a serial cable, one of the routers needs to host the DCE (Data Communications Equipment) side of [...]

Configuring RIP on a Cisco Router

Wednesday, July 8th, 2009

RIP (Routing Information Protocol) was one of the first routing protocols that hit the market, and still one of the easiest to configure.   RIPv1 is a classfull routing protocol and does not support VLSM’s or CIDR values and sends it’s updates as a broadcast message with a destination address of 255.255.255.255   RIPv2 supports [...]

What is a Routing Protocol?

Tuesday, July 7th, 2009

A routing protocol is a method that routers use to share information with each other about networks they are connected to. We have seen in previous posts on this website (Creating a Static Route and Default Gateway of Last Resort) how we make routes ourselves and how to teach a router how to send packets [...]

Static Routing

Wednesday, July 1st, 2009

A router by default only knows about networks that are directly connected to it. If a router is not directly connected to the final destination subnet, then the router needs to learn, or be told how to get to that destination.   Learning routes can take place through the use of routing protocols, however in [...]