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. The Data-Link layer is layer 2 in the Open Systems Interconnect (OSI) model for a set of telecommunication protocols.The Data-Link layer ensures that an initial connection has been set up, divides output data into data frames, and handles the acknowledgements from a receiver that the data arrived successfully. It also ensures that incoming data has been received successfully by analyzing bit patterns at special places in the frames....
Upon completion of this chapter, you will be able to: Explain the role of Data Link layer protocols in data transmission, describe how the Data Link layer prepares data for transmission on network media, describe the different types of media access control methods,... Inviting you to refer.
In this chapter, you learned to: Explain the role of Data Link layer protocols in data transmission, describe how the Data Link layer prepares data for transmission on network media, describe the different types of media access control methods,... Inviting you to refer.
The data link layer needs to pack bits into frames, so that each frame is distinguishable from another. Our postal system practices a type of framing. The simple act of inserting a letter into an envelope separates one piece of information from another; the envelope serves as the delimiter.
Data link control layer – often abbreviated simply to data link layer – is concerned with the transfer of data over a serial data link
The transmission mode may be either asynchronous or synchronous and based on either a character-oriented or a bit-oriented transmission control protocol
The data link layer is fundamental to the operation of all data communication applications
ECE/CS 372 Introduction to Computer Networks Lecture 1: Chapter 5 The Data Link Layer with goald understand principles behind data link layer services, instantiation and implementation of various link layer technologies.
Bài giảng Computer Networks 1 (Mạng Máy Tính 1): Lecture 3.1 của Dr. Phạm Trần Vũ trình bày về The Data Link Layer với những nội dung như Data Link Layer Design Issues, Functions of the Data Link Layer, Services Provided to Network Layer và một số nội dung khác.
Chapter 11 is named data link control, which involves flow and error control. It discusses some protocols that are designed to handle the services required from the data link layer in relation to the network layer.
Chapter 12 is devoted to access control, the duties of the data link layer that are related to the use of the physical layer. The main contents of this chapter include all of the following: Random access, controlled access, channelization.
Chapter 5 - Data link layer. After reading this chapter, the reader should be able to: Understand the functions of the data link layer, understand the concept of hop-to-hop delivery compared to host-to-host delivery and application-to-application delivery, understand the concept of access method and define different access methods used in LANs and WANs.
Data Link Layer. Learning Objectives
Upon completion of this chapter, you will be able to:
Explain the role of Data Link layer protocols in data transmission.
Describe how the Data Link layer prepares data for transmission on network media.
Describe the different types of media access control methods.
Identify several common logical network topologies and describe how the logical topology determines the media access control method for that network.
Explain the purpose of encapsulating packets into frames to facilitate media access. ...
The media access control methods described by the Data Link layer protocols
define the processes by which network devices can access the network media
and transmit frames in diverse network environments.
In chapter 4, students will be able to: Explain how physical layer protocols and services support communications across data networks, build a simple network using the appropriate, explain the role of the data link layer in supporting communications across data networks, compare media access control techniques and logical topologies used in networks.
Chapter 13 introduces you to wired LANs: Ethernet. This chapter introduces wired local area networks. A wired LAN, viewed as a link, is mostly involved in the physical and data link layers. We have devoted the chapter to the discussion of Ethernet and its evolution, a dominant technology today.
LANs do not normally operate in isolation. They are connected to one another or to the Internet. To connect LANs, or segments ofLANs, we use connecting devices. Connecting devices can operate in different layers of the Internet model. In this chapter, we discuss only those that operate in the physical and data link layers.
Chapter summary: Supports multiple cable types and speeds, uses the CSMA/CD MAC mechanism to detect collisions, uses a logical ring topology, uses the token passing MAC mechanism, uses a double ring or star topology, uses the token passing MAC mechanism, runs at speeds up to 11 Mbps, uses the CSMA/CA MAC mechanism.
Ensuring the sending entity does not overwhelm the receiving entity
Preventing buffer overflow
Time taken to emit all bits into medium
Time for a bit to traverse the link
• Network errors are in the form of corrupted data or lost data.
• Network errors occur naturally on all networks due to electrical noise and distortion
and must be detected and corrected by either hardware or software.
• Bit Error Rates (BERs) are calculated as the number of bits in error divided by the
number of bits transmitted. A BER of 1 in 100,000 might be shown as 1:105
as a BER of 10-5
• Errors often occur in bursts where many bits in a sequence will be in...
Data can be corrupted during transmission. For reliable
communication, error must be detected and corrected
are implemented either at the data link layer or the
transport layer of the OSI model.Error detection uses the concept of redundancy, which
means adding extra bits for detecting errors at the