Linux+ Study Guide, Third Edition -- Frontmatter -- Acknowledgments -- Contents at a Glance -- Contents -- Introduction -- Assessment Test -- Answers to Assessment Test -- Chapter 1: Linux Installation -- Evaluating Computer Requirements -- Workstations -- Servers -- Dedicated Appliances -- Special Needs -- Deciding What Hardware to Use -- A Rundown of PC Hardware -- CPU -- RAM -- Hard Disk Space -- Network Hardware -- Video Hardware -- Miscellaneous Hardware -- Determining Software Needs -- A Rundown of Linux Distributions -- Common Workstation Programs -- Common Server Programs -- Useful Software on Any System -- Validating Software Requirements -- Planning Disk Partitioning -- The PC Partitioning System -- Linux Partition Requirements -- Common Optional Partitions -- Linux Filesystem Options -- Partitioning Tools -- Selecting an Installation Method -- Media Options -- Methods of Interaction during Installation -- Installing Linux -- Configuring Boot Loaders -- The Role of the Boot Loader -- Available Boot Loaders -- Post-Installation X Configuration -- Selecting an X Server -- Configuring X -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 2: Text-Mode Commands -- Basic Command Shell Use -- Starting a Shell -- Viewing Files and Directories -- Launching Programs -- Using Shell Shortcuts -- File Manipulation Commands -- Navigating the Linux Filesystem -- Manipulating Files -- Manipulating Directories -- Locating Files -- Examining FilesÌ Contents -- Redirection and Pipes -- File Permissions -- Account and Ownership Basics -- File Access Permissions -- Changing File Ownership and Permissions -- Setting Default Permissions -- Using ACLs -- Editing Files with Vi -- Vi Modes -- Basic Text-Editing Procedures -- Saving Changes -- Using sed and awk -- Setting Environment Variables.

Where to Set Environment Variables -- The Meanings of Common Environment Variables -- Basic Shell Scripting -- Beginning a Shell Script -- Using External Commands -- Using Variables -- Using Conditional Expressions -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 3: User Management -- Linux Multiuser Concepts -- User Accounts: The Core of a Multiuser System -- Groups: Linking Users Together for Productivity -- Mapping UIDs and GIDs to Users and Groups -- The Importance of Home Directories -- Configuring User Accounts -- Adding Users -- Modifying User Accounts -- Deleting Accounts -- Configuring Groups -- Adding Groups -- Modifying Group Information -- Deleting Groups -- Common User and Group Strategies -- The User Private Group -- Project Groups -- Multiple Group Membership -- Account Security -- Enforcing User Password Security -- Steps for Reducing the Risk of Compromised Passwords -- Disabling Unused Accounts -- Using Shadow Passwords -- Controlling System Access -- Accessing Common Servers -- Controlling root Access -- Setting Filesystem Quotas -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 4: Disk Management -- Storage Hardware Identification -- Types of Storage Devices -- Linux Storage Hardware Configuration -- Partition Management and Maintenance -- Using fdisk to Create Partitions -- Creating New Filesystems -- Using a Combined Tool -- Checking a Filesystem for Errors -- Adding Swap Space -- Partition Control -- Identifying Partitions -- Mounting and Unmounting Partitions -- Using Network Filesystems -- Using df -- Defining Standard Filesystems -- Using RAID -- Writing to Optical Discs -- Linux Optical Disc Tools -- A Linux Optical Disc Example -- Creating Cross-Platform Discs.

Backing Up and Restoring a Computer -- Common Backup Hardware -- Common Backup Programs -- Planning a Backup Schedule -- Preparing for Disaster: Backup Recovery -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 5: Package and Process Management -- Package Concepts -- File Collections -- The Installed File Database -- Rebuilding Packages -- Installing and Removing Packages -- RPM Packages -- Debian Packages -- Tarballs -- Compiling Source Code -- GUI Package Management Tools -- Package Dependencies and Conflicts -- Real and Imagined Package Dependency Problems -- Workarounds to Package Dependency Problems -- Startup Script Problems -- Starting and Stopping Services -- Starting and Stopping via SysV Scripts -- Editing inetd.conf -- Editing xinetd.conf or xinetd.d Files -- Custom Startup Files -- Setting the Runlevel -- Understanding the Role of the Runlevel -- Using init or telinit to Change the Runlevel -- Permanently Changing the Runlevel -- Running Jobs at Specific Times -- The Role of Cron -- Creating System Cron Jobs -- Creating User Cron Jobs -- Using at -- Setting Process Permissions -- The Risks of SUID and SGID Programs -- When to Use SUID or SGID -- Finding SUID or SGID Programs -- Managing Processes -- Examining Process Lists with ps -- Restricting Processes' CPU Use -- Killing Processes -- Foreground and Background Processes -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 6: Networking -- Understanding Networks -- Basic Functions of Network Hardware -- Types of Network Hardware -- Network Packets -- Network Protocol Stacks -- Network Addressing -- Types of Network Addresses -- Resolving Hostnames -- Network Ports -- Basic Network Configuration -- Network Hardware Configuration -- DHCP Configuration.

Static IP Address Configuration -- Using GUI Configuration Tools -- Initiating a PPP Connection -- Network Server Configuration -- Super Server Configuration -- Delivering IP Addresses with DHCP -- Delivering Hostnames with DNS -- Delivering Files with Samba -- Delivering Files with NFS -- Setting Up a Remote Access Server -- Configuring Mail Servers -- Configuring Web Servers -- Using Network Clients -- Using X Programs Remotely -- Using an E-Mail Client -- Configuring Routing -- Remote System Administration -- Text-Mode Logins -- GUI Logins -- File Transfers -- Remote Administration Protocols -- Using NIS -- Network Diagnostic Tools -- Testing Basic Connectivity -- Tracing a Route -- Checking Network Status -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 7: Security -- Sources of Security Vulnerability -- Physical Access Problems -- Stolen Passwords -- Local Program Bugs -- Server Bugs -- Denial-of-Service Attacks -- Encryption Issues -- The Human Element -- Physical Security -- What an Intruder Can Do with Physical Access -- Steps for Mitigating Damage from Physical Attacks -- Firewall Configuration -- Where a Firewall Fits in a Network -- Linux Firewall Software -- Common Server Ports -- Using iptables -- Super Server Security -- Controlling Access via TCP Wrappers -- Controlling Access via xinetd -- Intrusion Detection -- Symptoms of Intrusion -- Using Snort -- Using PortSentry -- Using Tripwire -- Using chkrootkit -- Using Package Manager Checksums -- Monitoring Log Files -- Security Auditing -- Checking for Open Ports -- Reviewing Accounts -- Verifying Installed Files and Packages -- Imposing User Resource Limits -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 8: System Documentation.

Documenting System Configuration -- Documenting the Installation -- Maintaining an Administrator's Log -- Backing Up Important Configuration Files -- Documenting Official Policies and Procedures -- Establishing Normal Performance Measures -- Documenting CPU Load -- Documenting Memory Load -- Documenting Disk Use -- Collecting System Statistics -- Configuring Log Files -- Understanding syslogd -- Setting Logging Options -- Rotating Log Files -- Using a Remote Server for Log Files -- Using Log Files -- Which Log Files Are Important? -- Using Log Files to Identify Problems -- Tools to Help Scan Log Files -- System Documentation and Help Resources -- Using Man Pages -- Using Info Pages -- Using Miscellaneous Program Documentation -- Using Internet-Based Help Resources -- Summary -- Exam Essentials -- Commands in This Chapter -- Review Questions -- Answers to Review Questions -- Chapter 9: Hardware -- Checking Hardware Configuration -- Checking Cabling -- Checking IRQ, DMA, and I/O Settings -- Checking ATA Devices -- Checking SCSI Devices -- Checking BIOS Settings -- Configuring Power Management -- Activating Kernel Support -- Using APM -- Using ACPI -- Configuring External Hardware Devices -- Configuring PCMCIA Devices -- Configuring USB Devices -- Configuring IEEE-1394 Devices -- Configuring Legacy External Devices -- Configuring Basic Printing -- The Linux Printing Architecture -- Understanding PostScript and Ghostscript -- Running a Printing System -- Configuring BSD LPD and LPRng -- Configuring CUPS -- Printing to Windows or Samba Printers -- Monitoring and Controlling the Print Queue -- Using Scanners in Linux -- Understanding Scanner Hardware -- Choosing and Using Linux Scanner Software -- Diagnosing Hardware Problems -- Core System Problems -- ATA Problems -- SCSI Problems -- Peripherals Problems -- Identifying Supported and Unsupported Hardware.

Using an Emergency Boot Disk.