Question 1

What is true regarding TCP port 23?

Options :

A : Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used.

B : Port 23 is the well known port for the SSH service which provides secure logins.

C : Port 23 is the well known port for the rlogin service which is SSL secured by default.

D : Port 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.

Answer: A

Question 2

Given a file called birthdays containing lines like:

YYYY-MM-DD Name

1983-06-02 Tim

1995-12-17 Sue

Which command would you use to output the lines belonging to all people listed whose

birthday is in May or June?

Options :

A : grep '[56]' birthdays

B : grep 05?6? birthdays

C : grep '[0-9]*-0[56]-' birthdays

D : grep 06 birthdays | grep 05

Answer: C

Question 3

What is the correct command to extract the contents of the archive file download.bz2?

Options :

A : unpack download.bz2

B : unzip2 download.bz2

C : bunzip2 download.bz2

D : unzip download.bz2

E : uncompress download.bz2

Answer: C

Question 4

Which of the following are valid stream redirection operators within Bash? (Choose THREE

correct answers.)

Options :

A : <

B : <<<

C : >

D : >>>

E : %>

Answer: A,B,C

Question 5

Each entry in a crontab must end with what character?

Options :

A : Tab

B : Space

C : Backslash

D : Newline

Answer: D