Data link control layer

Những nội dung chính được trình bày trong chương này gồm có: Giao thức kết nối điểm-điểm (point-to-point), các yêu cầu của PPP, PPP Data Frame, PPP Data Control Protocol, ATM và MPLS, ảo hóa các mạng, internet - Mạng của các mạng,.... Mời các bạn cùng tham khảo.

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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.

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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.

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Introduction 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

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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.

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Ensuring the sending entity does not overwhelm the receiving entity Preventing buffer overflow Transmission time Time taken to emit all bits into medium Propagation time Time for a bit to traverse the link

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Fundamentals of WANs Trong chương trước, bạn đã học biết thêm chi tiết về Ethernet LAN thực hiện các chức năng được xác định bởi hai lớp thấp nhất OSI. Trong chương này, bạn sẽ tìm hiểu về mạng diện rộng (WAN) tiêu chuẩn và các giao thức cũng thực hiện OSI Layer 1 (lớp vật lý) và lớp 2 (lớp liên kết dữ liệu). Các chi tiết lớp vật lý của OSI được bảo hiểm, cùng với ba phổ biến dữ liệu giao thức lớp liên kết WAN: Cấp cao Data Link Control (HDLC), Point-to-Point Protocol (PPP), và...

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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....

64p thanhtq00103 08-06-2011 147 14   Download

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. ...

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Identify the basic characteristics of network media used in Ethernet. Describe the physical and data link features of Ethernet. Describe the function and characteristics of the media access control method used by Ethernet protocol. Explain the importance of Layer 2 addressing used for data transmission and determine how the different types of addressing impacts network operation and performance. Compare and contrast the application and benefits of using Ethernet switches in a LAN as apposed to using hubs....

94p thangvu89 15-04-2010 186 28   Download

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.

64p thangvu89 15-04-2010 169 26   Download