ACE-P-ALE1.04 questions and answers

Question 1

Single choice

Which special device provides a place for redirecting unneeded data?

1. A

   /dev/null

2. B

   /dev/zero

3. C

   /dev/urandom

4. D

   /dev/blank

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Correct answerA

Explanation

References:
https://bash.cyberciti.biz/guide//dev/null_discards_unwanted_output

Question 2

Single choice

What will the permissions of a regular file with octal mode 755 look like in the output of the 1s command?

1. A

   drwxr-xr-x

2. B

   w-r--r--
   C. wx-r--r--
   D. wxr-

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Correct answerB

Question 3

Single choice

In regular expressions, three quantifier operators are

1. A

   (), [] and {}

2. B

   (),. and *

3. C

   (), * and ?

4. D

   *, ? and +

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Correct answerD

Explanation

References:
https://www.perlmonks.org/?node_id=967

Question 4

Single choice

What term is used for the beginning of time for UNIX?

1. A

   Epoch

2. B

   Zero-hour

3. C

   Birth

4. D

   Dawn

5. E

   Awakening

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Correct answerA

Explanation

References:
https://unix.stackexchange.com/questions/26205/why-does-unix-time-start-at-
1970-01-01

Question 5

Single choice

Which of the following performance information is considered the most important information provided by the vmstat command?

1. A

   it reports total memory on the system

2. B

   it reports buffer activity

3. C

   it reports disk I/O

4. D

   it reports memory swapping

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Correct answerD

Question 6

Single choice

The standard output file descriptor defaults to what?

1. A

   Screen

2. B

   Keyboard

3. C

   Hard Drive

4. D

   Null Device

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Correct answerA

Question 7

Single choice

In file globbing, which symbol matches any single character?

1. A

   *

2. B

   ?

3. C

   []

4. D

   .

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Correct answerA

Explanation

References:
https://unix.stackexchange.com/questions/123296/what-is-the-symbol-called

Question 8

Single choice

When configuring SSH, which file is needed for key-based authentication?

1. A

   known_hosts

2. B

   /etc/shadow

3. C

   /etc/passwd

4. D

   authorized_keys

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Correct answerD

Explanation

References:
https://www.digitalocean.com/community/tutorials/how-to-configure-ssh-key-based-
authentication-on-a-linux-server

Question 9

Single choice

Which of the following interpreters are included on Arista switches?

1. A

   /usr/bin/bash

2. B

   /usr/bin/perl

3. C

   /usr/bin/python

4. D

   /usr/bin/Cli

5. E

   All of them

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Correct answerC

Question 10

Single choice

To create or delete files in a directory, you need what permission?

1. A

   read

2. B

   write

3. C

   execute

4. D

   setuid

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Correct answerB

Question 11

Single choice

Which of the following commands is most likely to cause you to need to restore from backup?

1. A

   rm -rf

2. B

   netstat -nr

3. C

   reboot

4. D

   ls -la

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Correct answerA

Question 12

Single choice

If the 1-minute load average is greater than 4xCPU cores (in other words, the run queue is very large), what might the system need to improve performance?

1. A

   Faster CPUs

2. B

   More CPUs

3. C

   More memory

4. D

   Faster hard drives

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Correct answerC

Question 13

Single choice

Ubuntu is a popular distribution from which core tree?

1. A

   Fedora

2. B

   Linux

3. C

   Debian

4. D

   Slackware

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Correct answerB

Explanation

https://answers.syr.edu/display/os/Linux+Distributions

Question 14

Single choice

Which if these is NOT true of symbolic, or soft, links?

1. A

   Has its own inode

2. B

   Is just a directory entry

3. C

   Can cross mount points

4. D

   Can point to a directory

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Correct answerC

Question 15

Single choice

Which character matches the end of a line in a regular expression?

1. A

   !

2. B

   ^

3. C

   $

4. D

   ?

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Correct answerC

Explanation

References:
https://docstore.mik.ua/orelly/unix3/upt/ch32_05.htm