CptS 302: Final Exam Review

The final exam is comprehensive
The final exam will have three parts
- In the first part, you will be asked "general knowledge" questions
  - e.g. What is root's UID?
- In the second part, you will be asked questions about a hypothetical system for which you have some config files
- In the third part, you will be asked questions about a script

Unix basics
- Two camps
  - BSD
  - AT&T/System V
- Startup methodologies
  - /sbin/init.d for System V
    - /etc/rc.d/init.d for Redhat Linux
  - /etc/inittab for System V
  - Run levels for System V
  - rc scripts for BSD
- Shutdown vs. poweroff
  - run shutdown, don't power off
    - filesystem problems if sync() not run
- Bootstrapping
  - What is it?
  - What's the basic idea of how Unix is booted?
Permissions
- root's UID
- things only root can do
- groups
- setuid
- setgid
- directories
  - r allows ls
  - w allows create, remove files
  - x allows access to files
Filesystem
- hard link
- soft link
- device file (major number, minor number)
Processes
- Process creation
  - Parent forks child
- init process
- nice
- zombies
- signals
Users
- passwd file format
- home directory
- login shell
- startup files
- ownership, permissions by UID, not name
Scripting
- syntax
- be able to read a script and tell what it does
Cron
- crontab command
- crontab format
- at
- cron gets no environmant, at does
Syslog
- syslog.conf format
- facilities, levels
- all lines that match get used
Networking
- TCP/IP layers
  - Physical, link, network, transport, application
- IP addresses
  - Network part/host part
  - IPv6
- Ethernet configuration (bus vs. ring)
- tokenless, "polite dinner conversation," collisions
DNS
- Types of records (SOA, A, MX, CNAME)
- server/client protocol
- resolv.conf syntax
- domains
security
- security vs. convenience
- password issues
  - no password
  - weak password
    - crack
  - shadow passwords

Final Exam Review

Final exam format

Things you should know for the final exam