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Start a career in networking
Cisco Networking Essentials, 2nd Edition provides the latest for those beginning a career in networking. This book provides the fundamentals of networking and leads you through the concepts, processes, and skills you need to master fundamental networking concepts. Thinking of taking the CCENT Cisco Certified Entry Networking Technician ICND1 Exam 100-101? This book has you covered! With coverage of important topics and objectives, each chapter outlines main points and provides clear, engaging discussion that will give you a sound understanding of core topics and concepts. End-of-chapter review questions and suggested labs help reinforce what you´ve learned, and show you where you may need to backtrack and brush up before exam day.

Cisco is the worldwide leader in networking products and services, which are used by a majority of the world´s companies. This book gives you the skills and understanding you need to administer these networks, for a skillset that will serve you anywhere around the globe.

Understand fundamental networking concepts
Learn your way around Cisco products and services
Gain the skills you need to administer Cisco routers and switches
Prepare thoroughly for the CCENT exam
If you´re interested in becoming in-demand, network administration is the way to go; if you want to develop the skillset every company wants to hire, Cisco Networking Essentials, 2nd Edition gets you started working with the most widespread name in the business.



Table of Contents

Introduction xxiii
Chapter 1 Networks 1

Describing Network Components 1

Defining the Benefits of Networks 2

Identifying the Requirements for a Network 5

Classifying Networks by Function 8

Understanding LANs 9

Understanding WANs10

Defining Network Architectures 10

Understanding Peer-to-Peer Networks 11

Understanding Client-Server Networks 14

The Essentials and Beyond 17

Chapter 2 The OSI Model 19

Using Reference Models 19

Understanding the Benefits of Reference 21

Exploring Reference Model Examples 21

Introducing the Layers of the OSI Model 22

Understanding the Application Layer 23

Understanding the Presentation Layer 24

Understanding the Session Layer 26

Understanding the Transport Layer 26

Understanding the Network Layer 30

Understanding the Data-Link Layer 31

Understanding the Physical Layer 33

Describing the OSI Encapsulation Process 33

Identifying the Process on the Source Device 34

Identifying the Process on the Destination Device 35

The Essentials and Beyond 36

Chapter 3 TCP/IP 39

Understanding the TCP/IP Model 40

Exploring the Four Layers 41

Comparing the OSI and TCP/IP Models44

Describing the TCP/IP Encapsulation Process 46

Understanding Data and PDUs 46

Describing the Contents of Data 47

Describing the Contents of Segments 47

Describing the Contents of Packets 47

Describing the Contents of Frames 47

Understanding the Conversion to Bits 48

Describing the Functions at the Transport Layer 50

Understanding TCP 50

Understanding UDP 51

Describing the Functions at the Internet Layer 52

Defining Logical Addressing 53

Performing Routing 54

Accomplishing Packet Forwarding 54

Describing the Functions of ARP 55

Illustrating the ARP Broadcast 55

Describing the Logic of MAC-to-IP-Address Conversion 57

The Essentials and Beyond 59

Chapter 4 Protocols 63

Understanding the Function of Protocols 64

Defining Routed Protocols 64

Defining Routing Protocols 64

Exploring Application Layer Protocols 65

Describing FTP 65

Describing TFTP 67

Describing SMTP 67

Describing DNS 69

Describing SNMP 70

Exploring Transport Layer Protocols 72

Reviewing TCP 72

Reviewing UDP 76

Exploring Internet Layer Protocols 77

Describing IP 77

Describing ARP 79

Describing ICMP 80

Describing IGMP 82

Exploring Network Access Layer Protocols 83

Defining Network Access Layer Protocols on the LAN 84

Defining Network Access Layer Protocols on the WAN 85

The Essentials and Beyond 86

Chapter 5 Physical and Logical Topologies 91

Designing the Physical Topology 91

Implementing a Bus Topology 92

Implementing a Ring Topology 93

Implementing a Star Topology 94

Implementing a Mesh Topology 96

Implementing a Hybrid Topology 97

Implementing a Point-to-Point Topology 98

Implementing a Point-to-Multipoint Topology 100

Designing the Logical Topology 101

Understanding the Token Ring Topology 101

Understanding the FDDI Ring Topology 102

Understanding the Star Topology 103

The Essentials and Beyond 105

Chapter 6 Numbering Systems 109

Exploring Binary Numbering 109

Understanding the Base-2 Numbering System 110

Understanding the Relationship between Binary and Computers 112

Exploring Hexadecimal Numbering 114

Understanding the Base-16 Numbering System 114

Identifying MAC Addresses 116

Applying Conversions 118

Decimal-to-Binary Conversion 118

Hex-to-Decimal Conversion 121

Binary-to-Hex Conversion 123

The Essentials and Beyond 124

Chapter 7 Classful IP Addressing 129

Describing the Function of IP Addresses 129

Identification 130

Segmentation 131

Identifying IP Address Types 132

Defining IP Address Classes 133

Identifying Network and Host Addresses 135

Describing Private IP Addresses and NAT 138

Utilizing Diagnostic Tools 139

Executing the ipconfig Command 141

Executing the ping Command 141

Executing the arp Command142

Executing the traceroute Command 143

Understanding DHCP 143

Operations 143

Cisco DHCP 145

Introducing IPv6146

IPv6 Address Format 146

IPv6 Address Types147

Special IPv6 Addresses 148

The Essentials and Beyond 148

Chapter 8 Classless IP Addressing 153

Understanding the Limitations of Classful Networking 153

Exhaustion of the Class B Network Address Space 154

Unmanageable Routing Tables 154

Exhaustion of the 32-Bit IPv4 Address Space 155

Understanding the Benefi ts of Subnetting 155

Identifying Sources of Network Congestion156

Deploying Subnetting as a Segmentation Tool 157

Describing the Components of CIDR 158

Introducing Classless Subnetting158

Designing and Implementing CIDR 160

Understanding VLSM 167

Summarization 171

The Essentials and Beyond 172

Chapter 9 Media 175

Selecting the Proper Media Type 175

Bandwidth 176

Security 176

Convenience 180

Cost 180

Understanding Cabling 181

Describing Cable Behavior and Characteristics 181

Describing Physical Implementations183

Choosing the Correct Wiring Standard 187

Describing Wireless Standards 191

Identifying Standards Bodies191

Understanding 80211 Amendments 192

Understanding Wireless LAN Components and Terminology 193

Describing CSMA/CA Op