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© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1
OSI Data Link Layer
Network Fundamentals
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2© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Link Layer – Accessing the Media Describe the service the Data Link Layer provides as it
prepares communication for transmission on specific media
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3© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Link Layer – Accessing the Media Describe why Data Link layer protocols are required to
control media access
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4© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Link Layer – Accessing the Media Describe the role of framing in preparing a packet for
transmission on a given media
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5© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Link Layer – Accessing the Media Describe the role the Data Link layer plays in linking the
software and hardware layers
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6© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Link Layer – Accessing the Media Identify several sources for the protocols and standards
used by the Data Link layer
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7© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Explain the necessity for controlling access to the
media
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8© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Identify two media access control methods for shared
media and the basic characteristics of each
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9© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Define Full Duplex and Half Duplex as it relates to
Media Access Control for non-shared media
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10© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Describe the purpose of a logical topology and identify
several common logical topologies
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11© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Contrast logical and physical topologies
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12© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Identify the characteristics of point-to-point topology
and describe the implications for media access when using this topology
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13© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Identify the characteristics of multi-access topology and
describe the implications for media access when using this topology
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14© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Techniques Identify the characteristics of ring topology and describe
the implications for media access when using this topology
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15© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media Access Control Addressing and Framing Data Describe the purpose of encapsulating packets into
frames to facilitate the entry and exit of data on media
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16© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media access control addressing and framing data Describe the role of the frame header in the Data Link
layer and identify the fields commonly found in protocols specifying the header structure
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17© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media access control addressing and framing data Describe the role of addressing in the Data Link layer
and identify cases where addresses are needed and cases where addresses are not needed
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18© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Media access control addressing and framing data Describe the importance of the trailer in the Data Link
layer and its implications for use on Ethernet, a "non-reliable" media
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19© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Thank You