© 2007 cisco systems, inc. all rights reserved.cisco public 1 data link layer and physical layer...

© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1

DATA LINK LAYER AND PHYSICAL LAYERDerived From CCNA Network

Fundamentals – Chapter 7 and 8

EN0129 PC AND NETWORK TECHNOLOGY I

2© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

communication for transmission on specific media

3© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

media access

4© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

transmission on a given media

5© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

software and hardware layers

6© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

Data Link layer

7© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

8© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

and the basic characteristics of each

9© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

Access Control for non-shared media

10© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

common logical topologies

11© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

Media Access Control Techniques Logical and physical topologies

12© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

implications for media access when using this topology

13© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

implications for media access when using this topology

14© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

for media access when using this topology

15© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

facilitate the entry and exit of data on media

16© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

17© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

18© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

20© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

21© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

transported across the local media.

22© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

23© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

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

24© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

Physical Layer Protocols & Services Hardware components associated with the Physical

layer that are governed by standards

25© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

individual bits encoded onto the Physical layer;

and the basic encoding techniques.

26© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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.

27© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

28© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

standards.

29© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

of proper cabling in reducing interference

30© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

31© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

32© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

cabling

33© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

advantages over other media

34© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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

35© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public

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