To build a network of any size, the media must be shared between multiple devices rather than dedicated to a single pair of devices. The main task of the data link layer is to transform a raw transmission facility into a line that appears free of undetected transmission errors to the network layer. Data link layer is the second layer in osi reference model and lies above the physical layer. See page 89 of your foundation of computer science second edition example 4.
The data link layer divides the stream of bits received from the. This presentation covers the datalink layer of the networks lecture slides from the 3rdyear module on computer networks at the university of birmingham, uk. It also includes the source and the destination mac addresses. Computer networks hand written notes download student. Computers may connect to each other by either wired or wireless media. User can then access his mails and download them to the local computer. It deals with protocols, flowcontrol, and error control.
Program to remotely power on a pc over the internet using the wakeonlan protocol. These quiz objective questions are helpful for examinations nielit, bca, b. Review of error detection of data link layer in computer network. For the love of physics walter lewin may 16, 2011 duration. Topics in our studying in our computer networks notes pdf. These quiz objective questions are helpful for examinations nielit. Layer 3 the network layer layer 3, the network layer of the osi model, provides an endtoend logical addressing system so that a packet of data can be routed across several layer 2 networks ethernet,token ring, frame relay, etc. Here is detailed list of best data communication and networks books for universities. Computer networking and management lesson 5 the data. Lecture notes data communication networks electrical. Physical layer b data link layer c mac layer d network layer answer. Computer networks collection of multiple choice questions mcq of computer networking is given below 1. On networks having coding redundancy on physical medium 10. Data communication and computer network 1 a system of interconnected computers and computerized peripherals such as printers is called computer network.
The data link layer provides the functional and procedural means to transfer data between network entities and. Data communication and computer networks pdf notes dccn. Data link layer osi model computer networks tutorial. Computer networks hand written full notes download. Data link layer raj jain professor of cis the ohio state university columbus, oh 43210. If suppose, n number of devices are connected with each other, then total number of links required to connect nc 2. Data networks lecture 1 introduction mit opencourseware. All devices connected arbitrarily using all previous ways to connect each other, resulting in a hybrid structure. All of the above 12 what is a firewall in computer network. Different types of data can be stored in the computer system.
Best recommended data communication and networks notes pdf and books for universities. Link layer and local area networks in this lesson we examine the data link layer its services, the principles underlying its operation, and a number of important data link layer protocols. Computer networks multiple choice questions and answers pdf free download objective type questions with answers interview questions lab viva online bits quiz. Part i how data frames can be reliably transmitted, and part ii how a shared communication medium can be accessed in many networks, such as an lan, communication medium is shared. The network layer must know the topology of the subnet and choose appropriate paths through it. Mar 24, 2006 free ebook communication networks by sharam hekmat. At the physical layer, messages consist of bits placed on the media but this technique does not scale to even smalltomoderate size networks. Analog and digital, analog signals, digital signals, analog versus digital. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. A link isthe communication channels that connect two adjacent hosts or routers. Data link layer data link layer protocols create, transmit, and receive packets.
In mesh topology, every device is connected to another device via particular channel. It is the data link layer that will convert the data into binary digits such as 1 and 0 and then prepare them for the physical layer. Here are the basic functionalities of the data link layer. Performance transmission media switching circuitswitched networks packet switching. It makes the physical layer appear errorfree to the upper layer network layer. You need adobe reader to open these files as they are in pdf format. Data link layer is the second layer from bottom of the osi model and it is responsible for successful data synchronization it means data link layer provides or acts as an intermediate, ensuring delivery of data message to its respective destination in the network by using the physical address of the device known as mac media access control address. This includes numeric data, text, executable files, images, audio, video. Bus topology is a network type in which every computer and network device is connected to single cable. When source and destination are in different networks, the network layer ip must deal with these differences.
Data link layer silvia giordano ica, epfl the datalink layeris responsible for transferring a datagram across an individual link. Data communications and computer networks pdf vssut dccn. Data communication and computer networks pdf notes dccn notes sorry download link file is not available. The data link layer provides data reliability and provides tools to establish, maintain, and release data link connections among the network nodes. This book is concerned with post computer communication networks and two of its. It is responsible for establish and termination of connection between two nodes over a network. Examples of linklayer protocols include ethernet, token ring, fddi, and ppp. Data link layer mcqs computer networks objective questions. The header in this layer provides the source and destination mac addresses. Protocol layering d needed because communication is complex d intended primarily for protocol designers. We learn that the basic service of the data link layer is to move a network layer datagram from one node host or router to an adjacent node. It contains multiple choice questions and answers about physical layer, data link layer etc. Computer networks mcq with answers and pdf download eduzip. The data link layer provides the functional and procedural means.
The data link layer takes the packet from the network layer and breaks it into frames. Other responsibilities of the data link layer include the following. Jul 15, 2019 networks network types protocol layering tcpip protocol suite osi model physical layer. Physical layer also defines the way in which the data flows between the two connected devices. This tutorial gives very good understanding on data communication and computer. Data link layer 2 the data link layer takes the packet from the network layer and breaks it into frames.
The data link layer, or layer 2, is the second layer of the sevenlayer osi model of computer networking. Layer 3, the network layer of the osi model, provides an endtoend logical addressing system so that a packet of data can be routed across several layer 2 networks ethernet,token ring, frame relay, etc. Computer networks pdf notes free download cn notes. The data link layer, or layer 2, is the second layer of the seven layer osi model of computer networking. Mcq questions and answers on data communication and computer networks or multiple choice questions with answers on data communication and networks from chapter communication network fundamentals. This interconnection among computers facilitates information sharing among them. Elec3030 el336 computer networks s chen data link layer. The protocols are developed in increasing complexity to help students understand the data link layer issues. Data link layer of osi reference model studytonight. The data link layer is the second layer in the osi model, above the physical.
Prepare the physical devices enabling devices for transmission of data and data is received. Note that network layer addresses can also be referred to as logical addresses. All of the above 12 what is a firewall in computer. The data link layer is the protocol layer in a program that handles the moving of data in and out across a physical link in a network. Introduction a computer network is the infrastructure that allows two or more computers called hosts to communicate with each other. Data link layer the data link layer transforms the physical layer, a raw transmission facility, to a reliable link.
Download cbse notes, neet notes, engineering notes, mba notes and a lot more from our website and app. It accomplishes this task by having the sender break up the input data into data frames typically a few hundred or few thousand bytes and transmit the frames sequentially. Data link layer is responsible for converting data stream to signals bit by bit and to send that over the underlying hardware. This layer is also responsible for logical mac addressing and llc processing, creating logical topologies, and controlling media access. In these computer networks notes pdf, we will study the concepts of data communication and computer networks which comprises of the study of the standard models for the layered protocol architecture to communicate between autonomous computers in a. Defines the methods and provides addressing information for communication between network devices. Today we are with the computer networks hand written notes specially for the baddi university students.
Pdf error control describes how the network handles and detects errors especially in the data link layer. This routing function is implemented by the network layer. The data link layer is also called as the layer 2 of the osi model. Between individuals, local communication usually occurs face to face, while remote communication takes place over distance. Data communication and computer network tutorialspoint.
Computer networking and management lesson 5 the data link layer. Data communication and computer network 2 all devices connected together with a single device, creating starlike structure. Complete notes module 1 overview of data communications and networking. Elec3030 el336 computer networks s chen data link layer overview date link layer deals with two basic issues. Fundamentals of computer networking and internetworking. Data link layer it is responsible for nodetonode delivery of data.
Data link layer 48 network layer 49 transport layer 51 session layer 53 presentation layer 54 application layer 55 summary of layer functions 56 3. Mcq questions and answers on data communication and computer networks protocols or multiple choice questions with answers on data communication and networks from chapter data link layer. Multiple choice questions of computer networking 11 computer network is a. We learn that the basic service of the data link layer is to move a networklayer datagram from one node host or router to an adjacent node. Data communication refers to the communication between digital computers, facilitated by computer networks. Cs8591 computer networks syllabus notes question banks. Communication networks i data link layer institut fur. This book is concerned with postcomputer communication networks and two of its important streams. Basic computer networking mcqs exam questions and answers ebook for job. Typically, the network layer adds its own header to the packets received from the transport layer. This header provides the information needed for routing e. In these computer networks notes pdf, we will study the concepts of data communication and computer networks which comprises of the study of the standard models for the layered protocol architecture to communicate between autonomous.
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