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Introduction to Networks v5.1

Chapter 4:

Network Access

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4.0 Introduction

4.1 Physical Layer Protocols

4.2 Network Media

4.3 Data Link Layer Protocols

4.4 Media Access Control

4.5 Summary

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Upon completion of this section, you should be able to:

• Identify device connectivity options.

• Describe the purpose and functions of the physical layer in the network.

• Describe basic principles of the physical layer standards.

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Home Router

Connecting to the Wired LAN

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Connecting to the Wireless LAN with Range Extender

Wired Connection Using an Ethernet NIC

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Manchester Encoding

Modulation

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Upon completion of this section, you should be able to:

• Identify the basic characteristics of copper cabling.

• Build a UTP cable used in Ethernet networks (scope – does not include cabling area discussion).

• Describe fiber-optic cabling and its main advantages over other media.

• Connect devices using wired and wireless media.

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RJ-45 UTP Plugs

RJ-45 UTP Socket

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UTP Testing Parameters:

• Wire map

• Cable length

• Signal loss due to attenuation

• Crosstalk

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Single Mode

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Multimode

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Fiber Optic Connectors

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Common Fiber Patch Cords

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Upon completion of this section, you should be able to:

• Describe the purpose and function of the data link layer in preparing communication for transmission on specific media.

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Layer 2 Data Link Address

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Upon completion of this section, you should be able to:

• Compare the functions of logical topologies and physical topologies.

• Describe the basic characteristics of media access control methods on WAN topologies.

• Describe the basic characteristics of media access control methods on LAN topologies.

• Describe the characteristics and functions of the data link frame.

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Physical Topology

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Logical Topology

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Half-Duplex Communication

Full-Duplex Communication

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Contention-Based Access

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Controlled Access

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Frames have three basic parts:

• Header

• Data

• Trailer

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Examples of Layer 2 protocols:

• 802.11 Wireless Frame

• PPP Frame

• HDLC

• Frame Relay

• Ethernet Frame

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Chapter Objectives:

• Explain how physical layer protocols and services support communications across data networks.

• Build a simple network using the appropriate media.

• Explain how the Data Link layer supports communications across data networks.

• Compare media access control techniques and logical topologies used in networks.

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Thank you.