Midterm Test #2 Answers

Test #2 - Points: 62  (15 of 25%)

1.   [Points: 1] Give the dotted-quad network mask for
     this subnet: 1.1.1.0/26   255.255.255.192

2.   [Points: 2] What is the next sub-net address
     numerically greater than: 2.2.2.0/25?  2.2.2.128

3.   [Points: 2] What is the next sub-net address
     numerically greater than: 9.9.9.0/24? 9.9.10.0

4.   [Points: 4] Give any two of the three RFC1918 private
     address space blocks and masks.  10/8 172.16/12 192.168/16

5.   [Points: 1] What command shows and sets the IP
     address and network mask of each network interface?  ifconfig

6.   [Points: 3] I want my computer to talk to another
     computer on a different network from mine.  What
     minimum network configuration do I need? IP addr, net mask, gateway

7.   [Points: 3] Fix the quoting in this shell command
     line so that the sentence appears on the screen as
     written: echo I'm buying "environmental" stock.
     echo "I'm buying \"environmental\" stock."
     echo "I'm buying "'"environmental"'" stock."
     echo I\'m buying \"environmental\" stock.

8.   [Points: 1] Which kind of shell quotes protect most
     strongly? single '

9.   [Points: 1] What is the name of the program that you
     can use to manually set the system clock before
     calling the NTP time server program?  ntpdate

10.  [Points: 1] Give the absolute pathname of the start-
     up script for the ntp-server time server package:
     /etc/init.d/ntp-server

11.  [Points: 1] Write the assignment that would set your
     shell's PATH variable to be the three directories
     /bin, /usr/bin, and /sbin.  PATH=/bin:/usr/bin:/sbin

12.  [Points: 2] Write a command to extract the third
     space-delimited word from every line in a file named foo:
     awk '{print $3}' foo

13.  [Points: 3] Write a command pipeline to extract just
     line 7 from a file named foo:
     head -7 foo | tail -1

14.  [Points: 5] Write a command pipeline to extract just
     the third space-delimited word from line 7 of a file
     named foo:
     head -7 foo | tail -1 | awk '{print $3}'

15.  [Points: 1] What kind of shell expansion does double-
     quoting your $variables prevent?  file GLOB (wildcards)

16.  [Points: 2] What command shows all processes for all users?
     ps ax   -or-    ps -e

17.  [Points: 2] Write a command that creates a symbolic
     link in /tmp/foo that contains the path bar: ln -s bar /tmp/foo

18.  [Points: 4] Rewrite and fix all the errors in this
     shell IF statement: if 5 > 3 print it's five that is bigger endif
     if [ 5 -gt 3 ]; then echo "it's five that is bigger" ; fi
     if test 5 -gt 3 ; then echo it\'s five that is bigger ; fi

19.  [Points: 1] A Unix/Linux tar file is an archive of
     individually compressed files: FALSE

20.  [Points: 1] Give the absolute path of the config file
     that controls Unix/Linux system logging: /etc/syslog.conf

21.  [Points: 1] Give the absolute path of the usual
     directory where log files are kept: /var/log/

22.  [Points: 1] Give the absolute path of the directory
     containing the master copy of all the system start-up
     scripts: /etc/init.d/

23.  [Points: 1] Give the absolute path of the directory
     containing the start-up script symlinks for run level 3: /etc/rc3.d/

24.  [Points: 1] Give the absolute path of the file name
     that lists and sets run levels: /etc/inittab

25.  [Points: 1] What does the prefix letter S mean on a
     start-up script symlink in a run-level directory?
     Run this script with a "start" argument at boot time.

26.  [Points: 1] What command displays all possible
     network interfaces and their statistics? ifconfig -a  -or- netstat -ai

27.  [Points: 1] What command changes the current run
     level in a running system?  telinit

28.  [Points: 2] How can you arrange that a start-up script is always
     started when the system enters, say, run level 3?
     link the start up script from /etc/init.d/foo to /etc/rc3.d/S55foo

29.  [Points: 2] What command fetches and installs a
     package on a Debian system?  apt-get install

30.  [Points: 1] What is absolute pathname of the
     principal network config file for Debian systems?
     /etc/network/interfaces

31.  [Points: 1] What is the absolute pathname of the
     system start-up script for networking on a Debian
     system?  /etc/init.d/networking

32.  [Points: 1] What command shows the default gateway?
     ip route   -or-   route

33.  [Points: 1] Give the absolute path of the file in
     which the list of DNS servers is kept:  /etc/resolv.conf

34.  [Points: 1] You must start/stop the network to make
     changes in DNS servers visible: FALSE

35.  [Points: 2] What is the purpose of a "gateway" IP
     address?  route packets to non-local networks

36.  [Points: 2] How does using the ifconfig command
     affect the routing table?  a route is automatically added for the
     interface being configured

37.  [Points: 1] The best time to synchronize your system
     clock is at midnight, when other time servers are
     most accurate: FALSE

Test #2 15 of 25%          NET2003                80 minutes