TAILIEUCHUNG - Network Fundamentals–Chapter 7

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. . | 111 a 111 a CISCO Data Link Layer Network Fundamentals - Chapter 7 ITE I Chapter 6 2006 Cisco Systems Inc. All rights reserved. Cisco Public 1 Objectives 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 Data Link layer prepares network data for the physical network. - Describe the Layer 2 frame structure and identify generic fields. - Explain the role of key frame header and trailer fields including addressing QoS type of protocol and Frame Check Sequence. ITE 1 Chapter 6 2006 Cisco Systems Inc. All rights reserved. Cisco Public 2 Connecting to Upper Layer Services j - - j Presentation The Data Link layer provides a means for exchanging data over a common local media. The Data Link layer performs two basic . . J services -Allows the upper layers to access the media using techniques such as framing -Controls how data is placed onto the media and is received from the media using techniques such as media access control and error detection The Data Link layer is responsible for the exchange of frames between nodes over the media of a physical network -Frame - The Data Link layer PDU -Node - The Layer 2 notation for network devices connected to a common medium -Media medium physical - The physical means for the transfer of information between two nodes -Network physical - Two or more nodes connected to a common medium A PDU at the Data A node is a device oh a network. The media a e the physical means used to carry data signals. Link ayer is called a rams. Network A network 5 two or more .

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