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Data Communication and Computer Network

by Wani Zahoor
Type: NoteInstitute: Kashmir University Views: 25Uploaded: 9 months agoAdd to Favourite

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Data Communication and Computer Network by Wani Zahoor

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Wani Zahoor
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Wani Zahoor
Wani Zahoor
Postal Correspondence GATE- 2016-17 Computer Networks Computer Science & Information Technology (CS) Postal Correspondence  Examination Oriented Theory, Practice Set  Key concepts, Analysis & Summary GATE & PSUs Postal Correspondence © 2015 ENGINEERS INSTITUTE OF INDIA® . All Rights Reserved 28-B/7, Jia Sarai, Near IIT, Hauz Khas, New Delhi-110016. Ph. 011-26514888. www.engineersinstitute.com Copyright: ©Wani Zahoor®™ 1
Postal Correspondence GATE- 2016-17 2 CONTENT 1. INTRODUCTION …………………………………………… 3-18 2. PHYSICAL LAYER …………………………………………. 19-23 3. ERROR DETECTION AND CORRECTION …………….. 24-30 4. FLOW CONTROL …………………………………………. 31-47 5. MEDIUM ACCESS CONTROL SUBLAYER …………… 48-61 6. NETWORK LAYER ………………………………………. 62-79 7. TRANSPORT LAYER …………………………………….. 80-88 8. APPLICATION LAYER …………………………………… 89-96 9. CRYPTOGRAPHY AND NETWORK SECURITY ……… 97-102 10.GATE Prectice Set………………………………………………103-130 Syllabus : Computer Networks: ISO/OSI stack, LAN technologies (Ethernet, Token ring), Flow and error control techniques, Routing algorithms, Congestion control, TCP/UDP and sockets, IP(v4), Application layer protocols (icmp, dns, smtp, pop, ftp, http); Basic concepts of hubs, switches, gateways, and routers. Network security – basic concepts of public key and private key cryptography, digital signature, firewalls. GATE & PSUs Postal Correspondence © 2015 ENGINEERS INSTITUTE OF INDIA® . All Rights Reserved 28-B/7, Jia Sarai, Near IIT, Hauz Khas, New Delhi-110016. Ph. 011-26514888. www.engineersinstitute.com Copyright: ©Wani Zahoor®™
Postal Correspondence GATE- 2016-17 3 CHAPTER-1 INTRODUCTION 1. Introduction A computer network consists of a collection of computers, printers and other equipment that is connected together so that they can communicate with each other. Data communication and computer network are two different things. Data communication is the exchange of information between two or more devices through some transmission media. Components of a Network A computer network comprises the following components: a. A minimum of at least 2 computers b. Cables that connect the computers to each other, although wireless communication is becoming more common c. A network interface card d. ‘Switch’ used to switch the data from one point to another. e. Network operating system software Types of Computer Network There are basically three types of computer network based on scale. (i) Local Area Network(LAN) LAN is privately owned and used to share resources (may be hardware or software resources) and to exchange information with the capacity of few kilometer. LANs are reliable because they are restricted in size. LAN’s can be used to provide service within single office, single building or an entire campus. (ii) Metropolitan Area Network(MAN) MAN is designed to extend over the entire city. MAN is wholly owned and operated by a private company or may be a service provided by a public company. MAN can be created using connecting multiple LANs. (iii) Wide Area Network (WAN) WAN provides long-distance transmission of data over large geographical areas that may comprise a country, continent or even the whole world. In contrast to LANs, WANs may utilize public, leased or private communication devices. Types of Connection between Devices There are basically two ways to connecting the devices with each other: (i) Multipoint GATE & PSUs Postal Correspondence © 2015 ENGINEERS INSTITUTE OF INDIA® . All Rights Reserved 28-B/7, Jia Sarai, Near IIT, Hauz Khas, New Delhi-110016. Ph. 011-26514888. www.engineersinstitute.com Copyright: ©Wani Zahoor®™
Postal Correspondence GATE- 2016-17 4 In multipoint a link is shared among all the devices. All the devices communicate through that link only. (ii) Point to Point In point to point connection every device is connected with other device using a dedicated link. Network TOPOLOGY There are basically 4 network topology are defined. Network topology is basically determines the way of communicating and sharing of information with each other device. (i) Bus Topology In this topology, there is a single bus (connection) is shared with all the devices. Bus topology basically provides the multipoint connection. (ii) Mesh Topology In the Mesh topology every device is connected with other device using a dedicated link.so in mesh topology we required (n (n-1))/2 links. (iii) Star Topology In the star topology every device is connected through using a single device called hub. Here number links required became number of devices (n). (iv) Ring Topology In the ring topology devices are connected in the form of ring. Every device is connected to 2 devices. Number of links required in the ring topology is 2n. GATE & PSUs Postal Correspondence © 2015 ENGINEERS INSTITUTE OF INDIA® . All Rights Reserved 28-B/7, Jia Sarai, Near IIT, Hauz Khas, New Delhi-110016. Ph. 011-26514888. www.engineersinstitute.com Copyright: ©Wani Zahoor®™

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