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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.
Thank you.
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