Describe the functionality of LAN, MAN, and WAN networks. • Identify A network refers to two or more connected computers that . Kevlar Reinforcing Material. In this chapter, you'll begin by relating networks to situations and concepts . If you put the limited-access material in a drawer open to all employees, how do. Download free Basic Networking Tutorial course material and training (PDF ebook on 21 pages).
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An Introduction to Computer Networks 1 An Overview of Networks modest amounts of material from this book would have a strong claim. Computer Networking: Principles, Protocols, and Practice was written by Dr. Olivier . first release contains all the material for a one-semester first upper. 2. 1. Introduction. -A network can be defined as a group of computers and other devices -Each of the devices on the network can be thought of as a node; each.
There are different classifications, or types of IP addresses. The server holds that page, and sends it out when requested. There are three main functions: Internet Connection Components and Functions The diagram below shows a typical home or small office network layout. On it are three houses: See understanding DHCP for beginners. Most requests and content delivery on networks are similar to, or are based on, a client to server relationship.
All modern networks use the IP networking protocol, and to work on a network all devices require an IP address. IPv4 is the original version and is deployed in all home and office networks and on the Internet. All modern computers,tablets and smart phones are capable of using DHCP and are configured to use it by default.
For home and small office networks the DHCP service is built into the router that connects to the Internet. If no DHCP service is available clients will automatically assign their own IP address known as a local address or you can manually assign them called static addresses. See understanding DHCP for beginners. The domain name system is the heart of the Internet.
It is responsible for resolving domain names to IP addresses. The DNS servers store the data and are mainly located on the Internet e. This is normally assigned by the DHCP server. See Understanding DNS.
Cannot normally be changed. Examples are email to FAX gateways.
On earlier networks and in earlier networking courses routers were called gateways, and the term is still used when setting up networking clients. Your email address will not be published.
Internet Connection Components and Functions The diagram below shows a typical home or small office network layout. DSL Modem — This converts digital signals into analogue signals that are suitable for sending over a telephone line. Firewall and NAT Router A firewall functions like a router except that it blocks traffic from the external network according to user configured rules. NAT effectively isolates your home network from the Internet.
Computer Firewalls — If you are using Windows XP or above then you also will have firewall on your computer. When you install applications e.
Skype you will find that they change the firewall settings. This configuration is not normally used anymore. General Networking Physical Components and Functions Hubs,bridges and switches are all devices used to connect computers and other devices together on an Ethernet network.
Network Hub A hub connects two or more computers together like switch in diagram above. Network Bridge A bridge connects two network segments together and is a selective repeater. It uses this information to decide whether or not to repeat the traffic on a network segment. A Bridge works at level 2 data link Level and will transmit broadcasts. Bridges are also being replaced by switches Network Switch A switch Connects two or more computers together and used today in preference to a hub or bridge.
Those computers can send other messages at the same time without interfering. Switches do have a limitation though—they only know about the addresses of equipment that is plugged directly into them.
So, you can only send messages to a small number of devices—however many ports the switch has! If you need to send a message to a computer on another network, it will need to be sent through a router, which we discuss next.
Routers do the majority of the hard work on a network - they make the decisions about all the messages that travel on the network, and whether to pass messages to and from outside networks.
There are three main functions:. Routers separate networks into sections, or bridge different networks together, as we see in the example above—the private network of They can assign IP addresses.
In the example of They can filter messages or keep users out of private networks.
Most routers have a Firewall built in. This is a software function that keeps unwanted messages from reaching the computers on the inside, or private part, of the network. Let us take another look at As it turns out, that postal service building is acting as a Router. In this case, the postal service building is routing messages between the rest of the Internet using its public address and the street with private addresses.
This module is intended to provide some helpful background on networking. We recommend reading the upcoming but not finished! Learn about Wireless after this guide. Introduction This document covers the basics of how networking works, and how to use different devices to build networks.
This module covers the concepts of: Clients and servers—how services such as e-mail and web pages connect using networks. IP addresses—how devices on a network can be found. Network hubs, switches and cables—the hardware building blocks of any network.
Routers and firewalls—how to organize and control the flow of traffic on a network.
Clients and Servers An important relationship on networks is that of the server and the client. What is one real world example of a client and server relationship: Below we can see On it are three houses: Find the IP addresses assigned to your computer, and your network.
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