xviii CHAPTER 18 Data Recovery ..........................................................616 Recovering from System Startup Failure ........................617 Data Recovery Techniques ............................................633 CHAPTER 19 Introduction to Networking ...................................636 Networks—What Are They?...........................................638 Network Administrative Models .....................................639 Network Classifications ................................................641 Network Topologies ......................................................642 Network Equipment ......................................................645 Installing a Typical Network Interface Card ....................655 Diskless Workstations ..................................................657 Thin Client ..................................................................657 Network Operating System (NOS)...................................658 OSI Model ...................................................................658 IEEE 802 Standards .....................................................660 CHAPTER 20 Network Communication, Media, and Tools .....664 How Networks Communicate .........................................665 Network Media ............................................................676 Networking Tools .........................................................685 CHAPTER 21 Network Administration .........................................692 Peer-to-Peer Network Administration .............................694 Centralized Network Administration ...............................708 Windows Server ...........................................................719 Network Unattended Installation ...................................729 RAID Systems ..............................................................732 Storage Spaces and Storage Pools ................................734 CHAPTER 22 Wide Area Network (WAN) ....................................738 TCP/IP Addressing .......................................................740 Special WAN Equipment ...............................................748 Network Diagnostic Utilities ..........................................753 Internet Navigation ......................................................762 CHAPTER 14 Modems and Transceivers ....................................492 Public Telephone System ..............................................494 Modems ......................................................................494 Integrated Services Digital Network ...............................502 Digital Subscriber Lines ...............................................502 Cable .........................................................................505 Satellite ......................................................................507 T-Carrier Lines ............................................................507 Mobile Broadband .......................................................508 Setting up a Residential Internet Connection ..................516 McAfee Internet Connection Speedometer .......................516 Troubleshooting Modems ..............................................517 CHAPTER 15 Physical Security and Authentication ................524 Physical Security .........................................................525 Authentication and Education .......................................532 CHAPTER 16 Security Applications and Malware ....................544 Microsoft Security Applications .....................................546 Malicious Software ......................................................556 Firewall ......................................................................569 CHAPTER 17 PC Troubleshooting .................................................574 Common-Sense Practices .............................................576 Troubleshooting Overview .............................................578 Typical Startup Problems ..............................................582 Hard Drive Failures ......................................................586 Additional Mechanical Problems ...................................589 System and Intermittent Device Failure ..........................590 Windows Diagnostic Utilities ........................................591 Boot Sequences ...........................................................600 Preparation for Installing or Upgrading an Operating System .......................................................................605 Preventive Maintenance ...............................................606 CompTIA A+ Troubleshooting Objectives ........................610