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102-400 Questions and Answers

Question # 6

In which file, if present, must all users be listed that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)

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Question # 7

Each entry in a crontab must end with what character?

A.

Tab

B.

Space

C.

Backslash

D.

Newline

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Question # 8

Which of the following is observed and corrected by a NTP client?

A.

The skew in time between the system clock and the hardware clock.

B.

The skew in time between the system clock and the reference clock.

C.

Changes in the time zone of the current computer's location.

D.

Adjustments needed to support Daylight Saving Time.

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Question # 9

What is the purpose of the file /etc/profile?

A.

It contains the welcome message that is displayed after login.

B.

It contains security profiles defining which users are allowed to log in.

C.

It contains environment variables that are set when a user logs in.

D.

It contains default application profiles for users that run an application for the first time.

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Question # 10

By default, the contents of which directory will be copied to a new user's home directory when the account is created by passing the -m option to the useradd command? (Specify the full path to the directory.)

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Question # 11

On a Linux system with shadow passwords enabled, which file in the file system contains the password hashes of all local users? (Specify the full name of the file, including path.)

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Question # 12

Which of the following commands puts the output of the command date into the shell variable mydate?

A.

mydate="$(date)"

B.

mydate="exec date"

C.

mydate="$((date))"

D.

mydate="date"

E.

mydate="${date}"

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Question # 13

Which command is used to sync the hardware clock to the system clock? (Specify ONLY the command without any path or parameters.)

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Question # 14

With X11 forwarding in ssh, what environment variable is automatically set in the remote host shell that is not set when X11 forwarding is not enabled? (Specify only the environment variable without any additional commands or values.)

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Question # 15

The presence of what file will temporarily prevent all users except root from logging into the system? (Specify the full name of the file, including path.)

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Question # 16

What is true regarding a default route?

A.

The default route is always used first. When the default route is not available more specific routes are tried.

B.

When a default route is set, all other routes are disabled until the default route is deleted.

C.

The default route is only used if there is not a more specific route to a destination host or network.

D.

Without a default route, no network communication even in directly attached networks is possible.

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Question # 17

How many IP-addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/28? (Specify the number only without any additional information.)

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Question # 18

On a regular users workstation the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?

A.

The local routing information may be corrupted and must be re-validated using a routing protocol.

B.

One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout.

C.

There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default.

D.

DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

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