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Which command, available with all MTAs, is used to list the contents of the MTA's mail queue? (Specify ONLY the command without any path or parameters.)

Which of the following tools used for DNS debugging, reports not only the response from the name server but also details about the query?

A.

dnsq

B.

dig

C.

hostname

D.

dnslookup

E.

zoneinfo

What is true regarding TCP port 23?

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.

Which port is the default server port for the HTTPS protocol? (Specify the port number using digits.)

What is the command to delete the default gateway from the system IP routing table? (Choose TWO correct answers.)

A.

route del default

B.

ifconfig unset default

C.

netstat -r default

D.

ip route del default

E.

sysctl ipv4.default_gw=0

Which keyword must be listed in the hosts option of the Name Service Switch configuration file in order to make host lookups consult the /etc/hosts file?

Which of the following is a valid IPv6 address?

A.

2001:db8:3241::1

B.

2001::db8:4581::1

C.

2001:db8:0g41::1

D.

2001%db8%9990%%1

E.

2001.db8.819f..1

Which of the following are requirements in order to run a shell script like a regular command from anywhere in the filesystem? (Choose THREE correct answers.)

A.

The user issuing the command must be in the group script.

B.

The script file must be found in the $PATH.

C.

The script file must have the executable permission bit set.

D.

The script must begin with a shebang-line (#!) that points to the correct interpreter.

E.

The file system on which the script resides must be mounted with the option scripts.

What is the difference between the commands test -e path and test -f path?

A.

They are equivalent options with the same behaviour.

B.

The -f option tests for a regular file. The -e option tests for an empty file.

C.

Both options check the existence of the path. The -f option also confirms that it is a regular file.

D.

The -f option tests for a regular file. The -e option tests for an executable file.

What output will the following command sequence produce?

echo '1 2 3 4 5 6' | while read a b c; do

echo result: $c $b $a;

done

A.

result: 3 4 5 6 2 1

B.

result: 1 2 3 4 5 6

C.

result: 6 5 4

D.

result: 6 5 4 3 2 1

E.

result: 3 2 1