CompTIA Network+ N10-004 Exam Cram (Exam Cram (Pearson))

655 Pages·2009·6.106 MB·English

by  Mike Harwood

CompTIA®
Network+
Third Edition
Mike Harwood
CompTIA®Network+ Exam Cram, Third Edition Publisher
Copyright © 2009 by Pearson Education Inc. Paul Boger
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ISBN-13: 978-0-7897-3796-0 Cleveland
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Contents at a Glance
Introduction 1
Self-Assessment 7
Chapter 1 Introduction to Networking 13
Chapter 2 Cabling, Connectors, and Ethernet Standards 43
Chapter 3 Networking Components and Devices 95
Chapter 4 OSI Model and Network Protocols 133
Chapter 5 TCP/IP Routing and Addressing 177
Chapter 6 WAN Technologies and Internet Access 213
Chapter 7 Wireless Networking 245
Chapter 8 Network Performance Optimization 283
Chapter 9 Network Security 343
Chapter 10 Network Management Tools and Documentation 397
Chapter 11 Troubleshooting and Supporting the Network 443
Practice Exam 1 479
Answers to Practice Exam 1 499
Practice Exam 2 515
Answers to Practice Exam 2 533
Glossary 553
Index 601
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CompTIA®Network+ Exam Cram, Third Edition
Table of Contents
Introduction.........................................................1
Self-Assessment.....................................................7
Chapter 1:
Introduction to Networking................................................................13
Introduction..............................................................................................14
LANs, WANs, MANs, and WPANs.......................................................14
LANs................................................................................................14
WANs..............................................................................................15
Metropolitan Area Networks (MANs)...........................................15
WPANs............................................................................................15
Network Models.......................................................................................16
Peer-to-Peer Networking Model....................................................16
Client/Server Networking Model...................................................16
Comparing Peer-to-Peer and Client/Server Network Models.....17
Centralized and Distributed Computing.................................................18
Virtual Private Networks (VPNs)............................................................18
Components of the VPN Connection...........................................19
VPN Pros and Cons........................................................................20
Virtual Local Area Networks (VLANs)...................................................21
VLAN Membership........................................................................23
Network Topologies.................................................................................26
Bus Topology...................................................................................26
Ring Topology.................................................................................27
Star Topology..................................................................................28
Wired Mesh Topology....................................................................30
Wireless Topologies........................................................................31
Point-to-Point, Point-to-Multipoint, and Wireless Mesh
Topologies.....................................................................................33
Hybrid Topologies...........................................................................36
v
Contents
Review and Test Yourself..........................................................................37
The Facts.........................................................................................37
Key Terms........................................................................................38
Exam Prep Questions......................................................................39
Answers to Exam Prep Questions...................................................41
Need to Know More?...............................................................................42
Chapter 2:
Cabling, Connectors, and Ethernet Standards.........................................43
Introduction..............................................................................................45
General Media Considerations................................................................45
Broadband Versus Baseband...........................................................46
Simplex, Half Duplex, and Full Duplex.........................................46
Media Interference..........................................................................46
Attenuation......................................................................................47
Data Transmission Rates.................................................................48
Network Media.........................................................................................48
Twisted-Pair Cabling.......................................................................49
Coaxial.............................................................................................52
Fiber-Optic Cable...........................................................................53
Plenum Cables.................................................................................56
Media Connectors....................................................................................56
BNC Connectors.............................................................................56
RJ-11 Connectors............................................................................57
RJ-45 Connectors............................................................................58
F-Type Connectors and RG-59 and RG-6....................................59
Fiber Connectors.............................................................................59
RS-232 Standard.............................................................................61
IEEE 1394.......................................................................................62
Universal Serial Bus (USB).............................................................62
568A and 568B Wiring Standards...........................................................63
Straight Versus Crossover Cable..............................................................64
Rollover and Loopback Cables................................................................66
Loopback Cable...............................................................................66
Components of Wiring Distribution.......................................................66
Network Cross-Connects...............................................................67
Horizontal Cabling.........................................................................67
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CompTIA®Network+ Exam Cram, Third Edition
Vertical Cable..................................................................................69
Patch Panels.....................................................................................69
Type 66 and Type 110 Punchdown Blocks....................................71
MDF and IDF.................................................................................71
Demarc, Demarc Extension, and Smart Jacks...............................72
Verify Wiring Installation and Termination...................................74
IEEE and Overview of Networking Standards.......................................75
IEEE 802.2 Standard......................................................................76
IEEE 802.3x Standard Characteristics...........................................76
802.3 Ethernet Standards.........................................................................81
10BaseT...........................................................................................81
10BaseFL.........................................................................................82
Fast Ethernet...................................................................................82
Gigabit Ethernet: 1000BaseX.........................................................84
1000BaseT.......................................................................................85
10 Gigabit Ethernet........................................................................86
10GBaseT........................................................................................88
Review and Test Yourself..........................................................................88
The Facts.........................................................................................89
Key Terms........................................................................................90
Exam Prep Questions......................................................................90
Answers to Exam Prep Questions...................................................93
Need to Know More?...............................................................................94
Chapter 3:
Networking Components and Devices...................................................95
Introduction..............................................................................................96
Hubs..........................................................................................................96
MSAU.......................................................................................................97
Switches.....................................................................................................98
Hub and Switch Cabling.................................................................99
Bridges.....................................................................................................100
Bridge Placement and Bridging Loops........................................101
Types of Bridges............................................................................101
Routers....................................................................................................102
Gateways.................................................................................................103
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Contents
Network Cards.......................................................................................104
Types of Network Interfaces.........................................................104
Installing Network Cards..............................................................105
Media Converters...................................................................................106
Wireless Access Points...........................................................................107
Modems...................................................................................................108
Firewalls..................................................................................................110
DHCP Server.........................................................................................111
Repeaters.................................................................................................112
Specialized Network Devices.................................................................112
Multilayer and Content Switches.................................................113
Intrusion Detection and Prevention Systems...............................114
Load Balancer................................................................................115
Multifunction Network Devices...................................................115
DNS Server...................................................................................116
Bandwidth Shaper.........................................................................117
Proxy Server..................................................................................118
CSUs/DSUs..................................................................................120
Network Devices Summary..........................................................121
Advanced Features of a Switch...............................................................123
Power over Ethernet (PoE)..........................................................123
Spanning Tree................................................................................124
Trunking........................................................................................125
Port Mirroring...............................................................................126
Port Authentication.......................................................................126
Review and Test Yourself........................................................................126
The Facts.......................................................................................126
Key Terms......................................................................................128
Exam Prep Questions....................................................................129
Answers to Exam Prep Questions.................................................131
Need to Know More?.............................................................................132
Chapter 4:
OSI Model and Network Protocols......................................................133
Introduction............................................................................................134
The OSI Seven-Layer Model................................................................134
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CompTIA®Network+ Exam Cram, Third Edition
Physical Layer (Layer 1)...............................................................135
Data Link Layer (Layer 2)............................................................136
Network Layer (Layer 3)..............................................................136
Transport Layer (Layer 4).............................................................137
Session Layer (Layer 5).................................................................138
Presentation Layer (Layer 6)........................................................138
Application Layer (Layer 7)..........................................................138
OSI Model Summary....................................................................139
Identifying the OSI Layers at Which Various Network
Components Operate...........................................................................140
Connectionless and Connection-Oriented Protocols...........................140
Introduction to Protocols.......................................................................141
Internet Protocol (IP)....................................................................142
Transmission Control Protocol (TCP)........................................142
User Datagram Protocol (UDP)..................................................143
File Transfer Protocol (FTP)........................................................144
Secure File Transfer Protocol (SFTP)..........................................146
Trivial File Transfer Protocol (TFTP).........................................146
Simple Mail Transfer Protocol (SMTP).......................................147
Hypertext Transfer Protocol (HTTP).........................................147
Hypertext Transfer Protocol Secure (HTTPS)...........................148
Post Office Protocol Version 3/Internet Message Access
Protocol Version 4 (POP3/IMAP4)...........................................148
Telnet.............................................................................................149
Secure Shell (SSH)........................................................................150
Internet Control Message Protocol (ICMP)................................150
Address Resolution Protocol (ARP)/Reverse Address
Resolution Protocol (RARP)......................................................151
Network Time Protocol (NTP)...................................................152
Network News Transfer Protocol (NNTP).................................153
Secure Copy Protocol (SCP)........................................................153
Lightweight Directory Access Protocol (LDAP).........................154
Internet Group Management Protocol (IGMP)..........................154
Domain Name System (DNS)......................................................154
Simple Network Management Protocol (SNMP).......................161
Dynamic Host Configuration Protocol (DHCP)........................164
ix
Contents
Transport Layer Security..............................................................166
Session Initiation Protocol (SIP)/Real-Time Transport
Protocol (RTP)............................................................................166
TCP/IP Protocol Suite Summary................................................168
Review and Test Yourself........................................................................170
The Facts.......................................................................................171
Key Terms......................................................................................172
Exam Prep Questions....................................................................173
Answers to Exam Prep Questions.................................................175
Need to Know More?.............................................................................176
Chapter 5:
TCP/IP Routing and Addressing.........................................................177
Introduction............................................................................................179
IP Addressing.................................................................................179
IPv4................................................................................................180
IP Address Classes.........................................................................180
Subnet Mask Assignment..............................................................181
Subnetting......................................................................................182
Identifying the Differences Between IPv4 Public and
Private Networks..................................................................................183
Private Address Ranges.................................................................184
Classless Interdomain Routing (CIDR).......................................185
Default Gateways..........................................................................185
IPv4 Address Types.......................................................................187
IPv6 Addressing.............................................................................187
Comparing IPv4 and IPv6 Addressing.........................................191
Assigning IP Addresses...........................................................................191
Static Addressing...........................................................................191
Dynamic Addressing.....................................................................192
BOOT Protocol (BOOTP)..........................................................194
APIPA............................................................................................194
Identifying MAC Addresses...................................................................195
NAT, PAT, and SNAT............................................................................196
Network Address Translation (NAT)...........................................196
PAT and SNAT.............................................................................197
TCP/UDP Port Functions....................................................................198