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This is the BSDA Study Guide Book written via a wiki collaboration. Chapter Introduction Chapter Installing and Upgrading the OS and Software Recognize the installation program used by each operating system Recognize which commands are available for upgrading the operating system Understand the difference between a pre-compiled binary and compiling from source Understand when it is preferable to install a pre-compiled binary and how to do so Recognize the available methods for compiling a customized binary Determine what software is installed on a system Determine which software requires upgrading Upgrade installed software Determine which software have outstanding security advisories Follow the instructions in a security advisory to apply a security patch Chapter Securing the Operating System Determine the system's security level Recognize basic recommended access methods Configure an SSH server according to a set of requirements Configure an SSH server to use a key pair for authentication Preserve existing SSH host keys during a system upgrade Recognize alternate authentication mechanisms Recognize alternate authorization schemes Recognize BSD firewalls and rulesets Recognize the BSD utilities that shape traffic or control bandwidth Recognize BSD mechanisms for encrypting devices Recognize methods for verifying the validity of binaries Recognize the BSD methods for restraining a service Modify the system banner Chapter Files, Filesystems and Disks Mount or unmount local filesystems Configure data to be available through NFS Determine which filesystems are currently mounted and which will be mounted at system boot Determine disk capacity and which files are consuming the most disk space Create and view symbolic or hard links View and modify ACLs View file permissions and modify them using either symbolic or octal mode Modify a file's owner or group Backup and restore a specified set of files and directories to local disk or tape Backup and restore a file system Determine the directory structure of a system Manually run the file system checker and repair tool View and modify file flags Monitor the virtual memory system Chapter Users and Accounts Management Protect authentication data Create, modify and remove user accounts Create a system account Control which files are copied to a new user's home directory during account creation Change a password Change the encryption algorithm used to encrypt the password database Change a user's default shell Lock a user account or reset a locked user account Determine identity and group membership Determine who is currently on the system or the last time a user was on the system Enable accounting and view system usage statistics Chapter Basic System Administration Determine which process are consuming the most CPU View and send signals to active processes Use an rc(8) script to determine if a service is running and start, restart or stop it as required Configure a service to start at boot time View and configure system hardware View, load, or unload a kernel module Modify a kernel parameter on the fly View the status of a software RAID mirror or stripe Configure system logging Configure log rotations Review log files to troubleshoot and monitor system behavior Determine which MTA is being used on the system Create or modify email aliases for Sendmail or Postfix View the Sendmail or Postfix mail queue Read mail on the local system Understand basic printer troubleshooting Halt, reboot, or bring the system to single-user mode Recognize the difference between hard and soft limits and modify existing resource limits Recognize common, possibly third-party, server configuration files Configure the scripts that run periodically to perform various system maintenance tasks Determine the last system boot time and the workload on the system Monitor disk input--output Deal with busy devices Determine information regarding the operating system Understand the advantages of using a BSD license Chapter Network Administration Determine the current TCP--IP settings on a system Set a system's TCP--IP settings Determine which TCP or UDP ports are open on a system Verify the availability of a TCP--IP service Query a DNS server Determine who is responsible for a DNS zone Change the order of name resolution Convert a subnet mask between dotted decimal, hexadecimal or CIDR notation Gather information using an IP address and subnet mask Understand IPv6 address theory Demonstrate basic tcpdump(1) skills Manipulate ARP and neighbor discovery caches Configure a system to use NTP View and renew a DHCP lease Recognize when and how to set or remove an interface alias Chapter Basic Unix Skills Demonstrate proficiency in using redirection, pipes and tees Recognize, view and modify environmental variables Be familiar with the vi(1) editor Determine if a file is a binary, text, or data file Locate files and binaries on a system Overcome command line length limitations Find a file with a given set of attributes Create a simple Bourne shell script Find appropriate documentation Recognize the different sections of the manual Verify a file's message digest fingerprint (checksum) Demonstrate familiarity with the default shell Use job control Demonstrate proficiency with regular expressions Understand various "domain" contexts Configure an action to be scheduled by cron(8)