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.
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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).
Exploring the activities and details of the subject with a group will take longer. An important relationship on networks is that of the server and the client. A server is a computer that holds content and services such as a website, a media file, or a chat application.
The server holds that page, and sends it out when requested. A client is a different computer, such as your laptop or cell phone, that requests to view, download, or use the content. The client can connect over a network to exchange information. In the example below, two computers are connected together with an Ethernet cable. These computers are able to see each other and communicate over the cable.
The client computer asks for a website from the server computer. Most requests and content delivery on networks are similar to, or are based on, a client to server relationship.
On a network, the server can be located almost anywhere, and if the client has the address, it can access the content on the server. In order to send and direct data across a network, computers need to be able to identify destinations and origins. This identification is an IP—Internet Protocol—address. An IP address is just a set of four numbers between 1 and , separated by dots. An example of an IP address is An IP address is similar to a street address. Parts of the address describe where in the world the building is located, another part narrows it down to a state or city, then the area within that state or city, then the location on the street.
The complete addresses for each of these houses is: There are different classifications, or types of IP addresses. A network can be public, or it can be private. Public IP addresses are accessible anywhere on the Internet.
Private IP addresses are not, and most are typically hidden behind a device with a public IP address. Here we can see an example—a street with two buildings with public IP addresses —representing computers with addresses that are visible to the entire Internet.
These buildings might be anywhere in the world, but their addresses are complete, so we know exactly where they are and can send messages to them. We have a new building on the street.
That building has a public IP address, and a private IP address. There is also a fence that blocks the rest of the Internet from seeing and passing messages to addresses on the street.
The postal building controls messages that travel between the Internet and the street, keeping track of messages that leave the street, and directs return messages to the right house.
On the street, it has the address Traditionally, computers are connected to each other using cables—creating a network. But also many other tutorials are accessible just as easily! Computer PDF guide you and allow you to save on your studies. You should come see our Network documents. You will find your happiness without trouble!
We will do everything to help you! And you dear surfers what you need? Contents What is a computer Network? Beginners Created: January 1, Size: 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.
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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. A switch is effectively a bridge with more ports.
See the basic networking tutorial Wireless Access Point A wireless access point connects wireless devices to an Ethernet network, and to each other. Routers A router connects networks together. On Home networks the router is responsible for connecting the home network to the Internet and provides several important networking services like: Modern ones plug directly into a mains socket and require no other connections. Ranges from cat5 to cat6.