Types of Network
Category : 9th Class
Types of Network
While connecting more than one computer with each other through wire or wireless is called computer network. The first network was implemented by both IBM's SNA (Systems Network Architecture) and Digital's network architecture. Using network you can share peripheral and software. You need to load software only on the file server. All interconnected users use these software form server. This technique saves time and cost compared to installing and tracking files on independent computers. Using network you can also share several resources and files, such as printers, scanners, fax machines and modems which reduces the cost of hardware.
There are three types of computer network. They are the following:
LAN (Local Area Network)
A local area network can be of two computers and a printer in office, home or it can be extended throughout an organization. A computer lab in a school or college is a good example of LAN. It enables multiple users in a relatively small geographical area to exchange files and messages, as well as access shared resources such as file servers and printers. (See Figure. 9.4.1)
The following figure shows a LAN structure
WAN (Wide Area Network)
A Wide Area Network is one of the computer networks which is established on a large geographical area. While accessing through the Internet and connecting to the locations of an organization to each other it uses data links provided by the carrier services. It generally carries a variety of traffic types such as data, video and voice. Data services and telephone services are the most commonly used services. Today, high-speed LANs and switched internet works are becoming widely used, largely because they operate at very high speeds and support such high-bandwidth applications, as multimedia and video conferencing. The following image shows a WAN: (See Figure, 9.4.2), Internet is the best example of WAN. It allows people to access a vast information resource, talk to each other by email and join electronic news, discussion and special mailing groups.
The Fallowing are the advantages of the Internet:
The following are some of the popular Internet tools:
FTP (File Transfer Protocol)
Is a method that is used to transfer files from one networked computer to another. There are two ways to FTP the files privately and anonymously. If you have a private account on a machine then you can FTP to that machine with your login ID and password. Another way is anonymously FTP. In this method you must know the host name of the computer storing the information. You can login by using anonymous as the ID and your e- mail address as the password and use FTP to transfer any files to your own account or hard disk.
News Group
Is an application that allows you to access Usenet news. Usenet news consists of several thousand discussion groups where people can post and read articles about selected topics. You can subscribe to newsgroups, which interest you.
Telnet
Is a method that is used to connect to another computer on the Internet. This connection is often referred to as a terminal session. You may telnet to machines that provide access through either a private or public account.
WWW (World Wide Web)
Is one of the graphical parts of the Internet? With the help of hyperlinks the Web links one Internet site to another. No need to expect every resource on the Internet to be accessible through the Web. To access this, a document must be coded with links that can be read by Web servers. Newsgroups and E-mails are not part of the Web. The key piece of the Internet Software needed to access and navigate the Web is a Web browser. Interface enables you to ask for and view Web pages. Browsers vary in the number of features and the quality they offer.
MAN (Metropolitan Area Network)
As here the name defining itself that a network which is in a particular metropolitan area or can be denoted as a network within an entire city is known as MAN (Metropolitan Area Network). One of the suitable examples of this network is a cable connection. It is because the users are free to view number of channels at a particular time. The following figure shows MAN (Metropolitan Area Network): (See Figure. 9.4.3)
While connecting more than one computer with each other through wire or wireless is called computer network. Which one of the following developed first computer network?
(A) Microsoft
(B) Google
(C) IBM
(D) All of these
(E) None of these
Answer: (C)
Explanation
Correct Option:
(C) The first network was implemented by both IBM's SNA (Systems Network Architecture) and Digital's network architecture.
Incorrect Options:
Rest of the options is incorrect.
You can transfer file form various ways. Which one of the following allows transferring file from one network to another network?
(A) Tel net
(B) Newsreader
(C) FTP
(D) All of these
(E) None of these
Answer: (C)
Explanation
Correct Option:
(C) FTP is a method that is used to transfer files from one networked computer to another.
Incorrect Options:
(A) Telnet is a method that is used to connect to another computer on the Internet.
(B) Newsreader is an application that allows you to access Usenet news.
Jack connects his computer with network. What advantages Jack receives by this activity?
(A) File sharing
(B) Software sharing
(C) Reduce cost
(D) All of these
(E) None of these
Answer: (D)
Explanation
Correct Option:
(D) Using network you can share peripheral, file and software. Peripheral sharing reduces cost.
Incorrect Options:
Rest of the options is incorrect.
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