Special Tutorial for Beginners – Data Communications and Networking

by Gina Tina on April 14, 2013

The Basic of Data Communications and Networking that You Need to Know

The rapid expansion in the geographical coverage and the range of application supported by the Internet means that it is now the dominant network for most networked applications. User can gain access to the Internet and its applications in a variety ways. Most users at home and in small offices, for example, gain access through, say, a personal computer (PC) that is connected to either a telephone network – that is, a public switched telephone network – that is, a public switched telephone network (PSTN) or an integrated services digital network (ISDN) – or, in some cases, a cable television (CATV) network. In practice, this provider only a physical connection to a second network called an Internet service provider (ISP) network. This, as its name implies, provides the access point to the Internet for such users and also support for a range of applications.

Similarly, users at work gain access through, say, a PC or workstation that is connected to either an office or a campus network – known as a local area network or LAN – or, for a large business or corporation, to an enterprise-wide-private network. As we know, these are composed of multiple site LANs that are interconnected by an inter-site backbone network. In practice, each of these networks now utilizes the same operational mode and protocols as the Internet itself and hence, in the case of an enterprise network, these are known also as intranets.

Two more recent access networks are wireless network and entertainment network. Users on the move, for example, can now gain access to the services of the Internet through, say, a mobile phone, a personal digital assistant (PDA) or a laptop that communicates over a radio link that is the access point to a wireless network. In this way, the point of attachment of the user device to the network can vary, so supporting user mobility. Secondly, in addition to providing basic radio and television broadcasts, entertainment networks now provide an access point to the Internet and hence access to a much richer set of applications.

How is about the Internet and its Access Network?

In many instances, the expanding range of applications supported by the Internet has come about through the technological advances in the way the user information associated with these applications is represented. For example, until recently, the various access networks, in addition to providing their basic services such as telephony, only supported applications in which the user information was composed of text comprising strings of alphanumeric characters. As a result of the technological advances in the area of compression, however, the same access networks can now support a much richer set of applications involving multiple media types. These include not only text but digitized images, photos, pictures, speech, video and audio.

data communications and networkingTo study the technological issues relating to the Internet and its applications requires an in depth understanding to the Internet and its applications requires an in-depth understanding not only of the operation of the Internet itself but also of the operation of the different types of access network and how they interfaces with the Internet. In addition, because many of the application involve the transfer over a network of sensitive information, the topic of security is now important when describing the structure of the information being transferred.

 

Leave a Comment

Previous post:

Next post: