Welcome to CCNA Lab 04: Using the Service Password-Encryption Command. Each lab that I write is geared to help you learn and establish a foundation of networking skills that will not only help you pass the CCNA Exam, but will help you make a knowledgable network administrator. These labs use Networkcraft – The Online Network
I’m currently on Spring Break. It sure is nice to have a week off of school. I’ve been busy working on updates to the Online Network Simulator and hope to release them by the end of the week. With the new update you will be able to program 3 different routers configure their interfaces and
The Need For Routing Protocols
Routers within a network use routing protocols to talk with one another so that updates and changes to the network can be adapted to dynamically without any major involvement from the network administrator. A router in a network has a routing table so that it can keep track of where his fellow routers are. It is like his contact list or address book. If routing protocols didn’t exist we would have to configure static routes manually to each router in the network on every single router. This can be a lot of work if you have a lot of routers. If you only have static routes and one of your links goes down in the middle of your network there is no real way for the routers to update each other on the status of the broken link. YOU, the network administrator, will have to go into every single router on the network and remove the bad link and define an alternate route. Again, this can be a lot of work if you have a lot of routers in your network creating a lot of down time.
Using a routing protocol will solve this issue of having to do all this manual work every time there is a change in your network. In the rest of this article we are going to focus on RIPv1 and its predicesor RIPv2, but there are several other routing protocols that we will learn about later for the ICND2 Exam and the CCNA Exam. RIP is a great tool to learn about routing protocols because it is simple to understand and easy to configure. Other routing protocols like EIGRP, OSPF and IS-IS are more advanced than RIP, but build upon RIP’s core functionality. We focus on learning RIP first because it builds a solid foundation of Routing Protocol knowledge that will make learning more advanced routing protocols much easier. For the ICND1 Exam you will need to know everything about RIPv2 (and RIPv1), and have only basic understanding for EIGRP, OSPF, and IS-IS.
So, what is a routing protocol? Basically it is a language or format that routers use to communicate with each other, so that they can automatically learn about new routes and make new routing dicisions incase a link goes down somewhere in the network. Having this ability to automatically make decisions can help keep your network running smoothly even when problems arise (Smoothly will depend largely on if you have redundant links in your network or not).
In this video update today about my online network simulator progress I just wanted to show you the ‘?’ command that will allow you to see a list of available commands.
It seems that we talk an awful lot about subnetting but hardly anything about summarization, and so in this post that is exactly what we are going to talk about. The quick and easy way to explain what summarization is that it is the opposite of subnetting. When you are subnetting you are making the network smaller, but when you are summarizing…
Understanding how VLAN Trunks work is essential to you passing the CCNA Exam. In this post I’m going to talk about VLAN Encapsulation with 802.1Q, and all the details about the VLAN Trunking Protocol VTP.
Trunks are needed in switching networks with VLANs in order for hosts within different VLANs to still communicate with each other. When you create a VLAN you are supposed to maintain a 1 to 1 ratio with the number of subnets you have. Which means if you have 4 VLANs you should also have 4 subnets. Since each VLAN is in a different subnet they are in different networks and for devices in different networks to communicate with one another a Layer 3 device such as a router is needed. Interfaces on switches by default can only be assigned to one VLAN at a time. So, in order for you to send data about 4 different VLANs configured on a switch to a router you need to configure an interface to be a trunk link. Trunk links are able to send data for many different VLANs at one time. In order to keep them from getting mixed up they tag the switch frame.
VLANs are another important topic on the CCNA Exam that you will need to become very familiar with. VLAN stands for Virtual Local Area Network which means that you can now segment a LAN logically at the Layer 2 level rather than physically based on geographic location.
Benefits of VLANs
Having this capacity to logically break up network segments VLANs provide many benefits. They are able to break up broadcast domains, keep network failures from affecting the entire network, increase security, and reduce administrative overhead.
Point-to-Point Protocol or PPP for short is a layer 2 protocol for sending layer 3 packets over synchronous (ISDN) and asynchronous (dial-up) WAN links. Just like for every topic on the CCNA Exam there are many new terms that you will need to learn and understand about PPP. So, lets begin! Link Control Protocol The
The CCIE has been around since August 1993 and a lot has happened within the last 17 years. One big thing that has changed is that now there is actual curriculum to study and courses that you can take. That just didn’t exist 17 years ago. There was no