CCENT Study Guide

Introduction xxi
CCENT Exam Objectives xxxii
Assessment Test xxxviii
Chapter 1 Internetworking 1
Internetworking Basics 2
Internetworking Models 10
The Layered Approach 11
Advantages of Reference Models 12
The OSI Reference Model 12
The Application Layer 14
The Presentation Layer 15
The Session Layer 15
The Transport Layer 16
The Network Layer 21
The Data Link Layer 23
The Physical Layer 26
Summary 27
Exam Essentials 28
Written Labs 29
Written Lab 1.1: OSI Questions 29
Written Lab 1.2: Defining the OSI Layers and Devices 30
Written Lab 1.3: Identifying Collision and Broadcast Domains 31
Review Questions 32
Chapter 2 Ethernet Networking and Data Encapsulation 39
Ethernet Networks in Review 40
Collision Domain 41
Broadcast Domain 42
CSMA/CD 43
Half- and Full-Duplex Ethernet 45
Ethernet at the Data Link Layer 47
Ethernet at the Physical Layer 53
Ethernet Cabling 57
Straight-Through Cable 58
Crossover Cable 58
Rolled Cable 60
Fiber Optic 62
Data Encapsulation 64
The Cisco Three-LayerHierarchical Model 68
The Core Layer 68
The Distribution Layer 70
The Access Layer 70
Summary 71
Exam Essentials 71
Written Labs 72
Written Lab 2.1: Binary/Decimal/Hexadecimal Conversion 73
Written Lab 2.2: CSMA/CD Operations 77
Written Lab 2.3: Cabling 77
Written Lab 2.4: Encapsulation 78
Review Questions 79
Chapter 3 Introduction to TCP/IP 85
Introducing TCP/IP 86
A Brief History of TCP/IP 87
TCP/IP and the DoD Model 87
The Process/Application Layer Protocols 89
The Host-to-Host Layer Protocols 99
The Internet Layer Protocols 108
IP Addressing 116
IP Terminology 116
The Hierarchical IP Addressing Scheme 117
Private IP Addresses (RFC 1918) 122
IPv4 Address Types 124
Layer 2 Broadcasts 124
Layer 3 Broadcasts 124
Unicast Address 125
Multicast Address 126
Summary 127
Exam Essentials 128
Written Labs 130
Written Lab 3.1: TCP/IP 130
Written Lab 3.2: Mapping Applications to the DoD Model 130
Review Questions 132
Chapter 4 Easy

Todd Lammle is the Authority on Cisco Certification and Internetworking and is Cisco certified in all Cisco certification categories. He is a world-renowned author, speaker, trainer, and consultant. Todd has three decades of experience working with LANs, WANs, and large enterprise licensed and unlicensed wireless networks, including the implementation of large Cisco Data Centers world-wide. His books draw on his practical experience working on the largest networks in the world at companies such as Xerox, Hughes Aircraft, Texaco, AAA, Cisco and Toshiba. He has published over 60 books, including the very popular CCNA: Cisco Certified Network Associate Study Guide, CCNA Wireless Study Guide, and CCNA Data Center Study Guide, all from Sybex. He runs an international consulting and training company based in Colorado, Texas, and San Francisco. You can reach Todd through his forum and blog at www.lammle.com.