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chap7 - Data Link Layer Network Fundamentals Chapter 7...

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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE I Chapter 6 1 Data Link Layer Network Fundamentals – Chapter 7 Modified by Tony Chen 01/30/2009
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 2 Notes: If you see any mistake on my PowerPoint slides or if you have any questions about the materials, please feel free to email me at [email protected] . Thanks! Tony Chen College of DuPage Cisco Networking Academy
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 3 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. 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.
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 4 Connecting to Upper Layer Services The Data Link layer provides a means for exchanging data over a common local media. The Data Link layer performs two basic 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
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 5 Connecting to Upper Layer Services The Data Link layer provides services to support the communication processes for each medium over which data is to be transmitted. –At each hop along the path, an intermediary device - such as router - accepts frames from a medium, decapsulates the frame, and then forwards the packet in a new frame appropriate to the medium of that segment. Imagine a data conversation between two hosts, such as a PC in Paris with an Internet server in Japan. –Although the two hosts may be communicating with their peer Network layer protocols (IP for example) –In this example, as IP packet travels from PC to laptop, •it will be encapsulated into Ethernet frame, •decapsulated,and then encapsulated into a new data link frame to cross the satellite link.
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