e-book Computer-Communication Networks

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First, read the course syllabus. Then, enroll in the course by clicking "Enroll me in this course". Click Unit 1 to read its introduction and learning outcomes. You will then see the learning materials and instructions on how to use them. When you think of networking, what is the first word that comes to mind? If you answered "Internet," you are correct. The Internet is an example of a massive computer network.

Computer networks make it possible for one device to communicate with another device. Another example of a computer network is the local area network, or LAN. If you can access all of the desktops, laptops, wireless devices, and printers in your workplace, college, or home, you have a LAN. This unit will introduce the basic concept of a computer network and arm you with the tools you will need to work through the more technical aspects of this course.

ECSE 4670 - Computer Communication Networks

You will take a look at the different types of networks that exist, with the primary focus on the LAN. The unit continues with an introduction to the concept of layers, which is central to understanding how computer networks operate. You will also become familiar with Request for Comments RFC documents, which are standards that define all of the Internet protocols. The concepts presented in this course will provide you with the background information needed to develop network applications, take a network certification course, or communicate with other networks neighboring your LAN. In life, protocols define the way we interact with other people - for example, the way we behave in a public place.

In computer science, protocols are formal sets of rules that dictate the ways in which computers communicate with one another over a network medium. Protocols constitute the backbone of networking.

Course content

The application layer is where all network processes and applications run. Finally, we will discuss socket programming and how it can be used to develop network applications. When we talk about networks, we are talking about data transport. Each application relies on the transport layer that is described in this unit. It is a key layer in today's networks as it contains all the mechanisms necessary to provide a reliable delivery of data over any unreliable network. First, we will develop a simple reliable transport layer protocol. These protocols are the fundamental protocols for modern multimedia applications over the Internet.

In this unit, we will learn how packets groupings of data travel on a network and how each machine can be addressed uniquely so that data transport between two nodes is reliable. We will learn that networks can run out of space, meaning that unique addresses for different machines are no longer available.

In these situations, computer scientists must manage IP addressing using CIDR and subnetting - techniques we will learn about in this unit. The network layer is responsible for the delivery of packets from any source to any destination through intermediate routers. This unit will explain how you can address machines on a network from that layer, use IP addresses to determine physical addresses, and identify the different mechanisms in the link layer that can correct packet collisions when data is transferred over the wire.

This unit guides you through the principles of the link layer. Then the textbook will direct your focus to computer networks with a discussion of how multiple hosts share one transmission medium. The chapter ends with a detailed discussion of the two types of computer networks that are important today from a deployment perspective: Ethernet and WiFi. Multimedia over the Internet becomes more and more popular.

This unit guides you through the protocols for transmitting multimedia content, such as voice and video, over the Internet, and discusses security, reliability, and fault tolerance issues related to Internet applications. You will also be introduced to one of the most recent Internet-based technologies: cloud computation, and we will briefly discuss network remote access and directory services.

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Computer Networks: Crash Course Computer Science #28

We appreciate your feedback, whether you completed the whole course or even just a few resources. Your feedback will help us make our courses better, and we use your feedback each time we make updates to our courses. If you come across any urgent problems, email contact saylor. Your grade for the exam will be calculated as soon as you complete it. If you do not pass the exam on your first try, you can take it again as many times as you want, with a 7-day waiting period between each attempt.

Once you pass this final exam, you will be awarded a free Course Completion Certificate. Take this exam if you want to earn college credit for this course. Your grade for this exam will be calculated as soon as you complete it. If you do not pass the exam on your first try, you can take it again a maximum of 3 times , with a day waiting period between each attempt. Once you pass this final exam, you will be awarded a Credit-Recommended Course Completion Certificate and an official transcript. It is used for the network that covers large distance such as cover states of a country.

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It is not easy to design and maintain. WAN operates on low data rates.

Metropolitan Area Network (MAN)

Digital wireless communication is not a new idea. Earlier, Morse code was used to implement wireless networks. Modern digital wireless systems have better performance, but the basic idea is the same. System interconnection is all about interconnecting the components of a computer using short-range radio.


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Some companies got together to design a short-range wireless network called Bluetooth to connect various components such as monitor, keyboard, mouse and printer, to the main unit, without wires. Bluetooth also allows digital cameras, headsets, scanners and other devices to connect to a computer by merely being brought within range.

In simplest form, system interconnection networks use the master-slave concept. The system unit is normally the master , talking to the mouse, keyboard, etc. These are the systems in which every computer has a radio modem and antenna with which it can communicate with other systems. Wireless LANs are becoming increasingly common in small offices and homes, where installing Ethernet is considered too much trouble.

The radio network used for cellular telephones is an example of a low-bandwidth wireless WAN. This system has already gone through three generations. Inter Network or Internet is a combination of two or more networks. Inter network can be formed by joining two or more individual networks by means of various devices such as routers, gateways and bridges.

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Computer communications and networks

Operating System. Computer Architecture. Jenkins Maven. Apache Cordova Drools. We are Hiring! Sign in. Available on:. LAN networks are also widely used to share resources like printers, shared hard-drive etc. It connects computers in a single building, block or campus, i. Applications of LAN One of the computer in a network can become a server serving all the remaining computers called clients.