CCNA (R & S) Module 01 - Introduction to Networks - Chapter 4

© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1
Instructor Materials
Chapter 4: Network Access
CCNA Routing and Switching
Introduction to Networks v6.0

Chapter 4: Network Access
CCNA Routing and Switching
Introduction to Networks v6.0

Presentation_ID 13© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 4 - Sections & Objectives
 4.1 Physical Layer Protocols
• Identify device connectivity options.
• Describe the purpose and functions of the physical layer in the network.
• Describe basic principles of the physical layer standards.
 4.2 Network Media
• 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.
 4.3 Data Link Layer Protocols
• Describe the purpose and function of the data link layer in preparing communication
for transmission on specific media.
 4.4 Media Access Control
• 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.

4.1 Network Access

Physical Layer Protocols
Physical Layer Connection
 Types of Connections
 Network Interface Cards

Purpose of the Physical Layer
 The Physical Layer
• Accepts a complete frame from the data link
layer
• Encodes it as a series of signals that are
transmitted onto the local media
 Physical Layer Media
• Describe the media types
 Physical Layer Standards

Physical Layer Characteristics
 Functions
• Physical components
• Encoding
• Signaling
 Data Transfer
• Bandwidth – capacity to a medium to carry data
• Throughput - measure of the transfer of bits across the media
 Types of Physical Media

4.2 Network Media

Network Media
Copper Cabling
 Characteristics of Copper Cabling
• Inexpensive, easy to install, low resistance to electric current
• Distance and signal interference
 Copper Media
 Unshielded Twisted-Pair Cable
 Shielded Twisted-Pair Cable
 Coaxial Cable
 Copper Media Safety
• Fire and electrical hazards

Network Media
UTP Cabling
 Properties of UTP Cabling
• Cancellation of EMI and RFI signals with
twisted pairs
 UTP Cabling Standards
• TIA/EIA-568
• IEEE: Cat5, Cat5e, Cat6, Cat6e
 UTP Connectors
 Types of UTP Cable
• Rollover
• Crossover
• Straight-through
 Testing UTP Cables
 Cable Pinouts

Network Media
Fiber-Optic Cabling
 Properties of Fiber-Optic Cabling
• Transmits data over longer distances
• Flexible, but thin strands of glass
• Transmits with less attenuation
• Immune to EMI and RFI
 Fiber Media Cable Design
 Types of Fiber Media
• Single mode and multimode
 Fiber-Optic Connectors
 Testing Fiber Cables
 Fiber versus Copper

Network Media
Wireless Media
 Properties of Wireless Media
• Data communications using radio or
microwave frequencies
 Types of Wireless Media
• Wi-Fi, Bluetooth, WiMax
 Wireless LAN
• Wireless Access Point
• Wireless NIC adapters

4.3 Data Link Layer
Protocols

Data Link Layer Protocols
Purpose of the Data Link Layer
 The Data Link Layer
• What is this layer responsible for?
 Data Link Sublayers
• LLC communicates with the network layer
• MAC defines the media access processes
 Providing Access to Media
 Data Link Layer Standards
• IEEE
• ITU
• ISO
• ANSI

4.4 Media Access Control

Media Access Control
Topologies
 Controlling Access
to the Media
 Physical and Logical Topologies

WAN Topologies
 Common Physical WAN Topologies
• Point-to-point
• Hub and spoke
• Mesh
 Physical Point-to-Point Topology
 Logical Point-to-Point Topology

LAN Topologies
 Physical LAN Topologies
 Half and Full Duplex
 Media Access Control Methods
 Contention-Based Access
• CSMA/CD vs. CSMA/CA

Data Link Frame
 The Frame
• Header
• Data
• Trailer
 Frame Fields
 Layer 2 Address
 LAN and WAN Frames
• 802.11 Wireless Frame
• PPP Frame
• HDLC
• Frame Relay
• Ethernet Frame

4.5 Chapter Summary

 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.
Chapter Summary
Summary

CCNA (R & S) Module 01 - Introduction to Networks - Chapter 4

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