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DATA LINK LAYER AND PHYSICAL LAYERDerived From CCNA Network

Fundamentals – Chapter 7 and 8

EN0129 PC AND NETWORK TECHNOLOGY I

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Data Link Layer – Accessing the Media The service the Data Link Layer provides as it prepares

communication for transmission on specific media

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Data Link Layer – Accessing the Media Why Data Link layer protocols are required to control

media access

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Data Link Layer – Accessing the Media The role of framing in preparing a packet for

transmission on a given media

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Data Link Layer – Accessing the Media The role the Data Link layer plays in linking the

software and hardware layers

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Data Link Layer – Accessing the Media Sources for the protocols and standards used by the

Data Link layer

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Media Access Control Techniques The necessity for controlling access to the media

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Media Access Control Techniques Two media access control methods for shared media

and the basic characteristics of each

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Media Access Control Techniques Full Duplex and Half Duplex as it relates to Media

Access Control for non-shared media

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Media Access Control Techniques The purpose of a logical topology and identify several

common logical topologies

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Media Access Control Techniques Logical and physical topologies

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Media Access Control Techniques The characteristics of point-to-point topology and the

implications for media access when using this topology

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Media Access Control Techniques The characteristics of multi-access topology and the

implications for media access when using this topology

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Media Access Control Techniques The characteristics of ring topology and the implications

for media access when using this topology

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Media Access Control Addressing and Framing Data The purpose of encapsulating packets into frames to

facilitate the entry and exit of data on media

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Media access control addressing and framing data The role of the frame header in the Data Link layer and

the fields commonly found in protocols specifying the header structure

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Media access control addressing and framing data The role of addressing in the Data Link layer and cases

where addresses are needed and cases where addresses are not needed

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Media access control addressing and framing data The importance of the trailer in the Data Link layer and

its implications for use on Ethernet, a "non-reliable" media

© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 19

OSI Physical Layer

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Physical Layer Protocols & Services The purpose of the Physical layer in the network and

the basic elements that enable this layer to fulfill its function

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Physical Layer Protocols & Services The role of bits in representing a frame as it is

transported across the local media.

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Physical Layer Protocols & Services The role of signaling in the physical media.

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Physical Layer Protocols & Services Who establishes and maintains standards for the

Physical layers compared to those for the other layers of the network

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Physical Layer Protocols & Services Hardware components associated with the Physical

layer that are governed by standards

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Physical Layer Signaling and Encoding Network communication at this layer consists of

individual bits encoded onto the Physical layer;

and the basic encoding techniques.

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Physical Layer Signaling and Encoding The role of encoding as it applies to the transmission of

bits and the value of treating a collection of bits as a code.

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Physical Layer Signaling and Encoding The terms bandwidth, throughput, and goodput

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Characteristics & Uses of Network Media Media characteristics defined by Physical layer

standards.

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Characteristics & Uses of Network Media The impact interference has on throughput and the role

of proper cabling in reducing interference

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Characteristics & Uses of Network Media The basic characteristics of UTP cable

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Characteristics & Uses of Network Media The basic characteristics of STP and Coaxial cable

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Characteristics & Uses of Network Media Types of safety issues when working with copper

cabling

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Characteristics & Uses of Network Media Primary characteristics of fiber cabling and its main

advantages over other media

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Characteristics & Uses of Network Media The role of radio waves when using air as the media

and the increased need for security in wireless communications

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Characteristics & Uses of Network Media The characteristics used to categorize connectors,

some common uses for the same connectors, and the consequences for misapplying a connector in a given situation