Multiple Choice Oblig

Question 1

Which output is produced by the command echo "Hello Helene, how are you?" | sed -E s/H/X/?

Answer 1

Xello Helene, how are you?

Question 2

Which technology was used to connect the first two ARPAnet nodes?

Answer 2

Conventional phone lines

Question 3

The command ssh will

Answer 3

Give you secure access to a remote computer

Question 4

Suppose each of the following words appears in input.txt in a different line: “anna”, “xavier”, “ole”, “clara”. Which output is produced by the command cat input.txt | grep -E "a"

Answer 4

Three lines: “anna”, “xavier”, “clara”

Question 5

Which organization is responsible for assigning and delegating IP addresses and subnets?

Answer 5

ICANN

Question 6

Which UNIX command is used to display the list of files in a directory?

Answer 6

ls

Question 7

Who created the ARPAnet?

Answer 7

The Defense Advanced Research Projects Agency

Question 8

When was ARPA established?

Answer 8

1958

Question 9

Which of these tasks is performed by the W3C?

Answer 9

Develop and promote standards and formats used on the Web

Question 10

Which sentences match the regular expression / ?time/

Answer 10

“half time”, “primetime”, “time”, “superficially sentimental”

Question 11

What is the commonly “#!” pronounced?

Answer 11

Shebang

Question 12

What is a top-level domain registry?

Answer 12

A company that assigns the top-level domain names in a country/region/top-domain

Question 13

Which sentences match the regular expression /time/

Answer 13

“half time”, “primetime”, “time”, “superficially sentimental”

Question 14

The first country connected to the Internet outside the US was…

Answer 14

Norway

Question 15

What is the main difference between a packet-switching network and a circuit-switching network?

Answer 15

A packet-switched network is more robust and effective than a circuit-switched network

Question 16

Which output is produced by the command echo "Hello Helene, how are you?" | sed -E s/K/X/g?

Answer 16

Hello Helene, how are you?

Question 17

Which of these tasks is performed by the IETF?

Answer 17

Develop and promote internet standards

Question 18

Which entities manage the domain names records?

Answer 18

ICANN

Question 19

Which UNIX command would forcefully shut down the command with process ID 123?

Answer 19

kill -9 123

Question 20

The command ssh example.com will..

Answer 20

Connect to example.com, accessing as the remote user with the same name of the current user.

Question 21

HTTPS - What does the S stand for?

Answer 21

Secure: The connections is secured with TLS

Question 22

Which UNIX command produces an output like “/dev/sda3 113G 105G 2,7G 98% /home”?

Answer 22

df -h

Question 23

Suppose each of the following words appears in input.txt in a different line: “anna”, “sara”, “ole”, “xavier”. Which output is produced by the command cat input.txt | grep -E "a$"

Answer 23

Two lines: “anna”, “sara”

Question 24

What is the main task of a shell?

Answer 24

To allow the user to manipulate data and explore the system by running commands.

Question 25

The common POSIX shell sh is a derivative of which shell?

Answer 25

Bourne shell

Question 26

Which UNIX command is used to change the schedule of the execution of programs in the future?

Answer 26

contrab

Question 27

What is the purpose of the “#!” first line in a script file?

Answer 27

It specifies which interpreter or shell should be used to run this file

Question 28

Which of the following UNIX pipelines will output the first 5 lines of file.txt that start with “ABC”?

Answer 28

grep ^ABC file.txt | head -n 5

Question 29

How many different IPv4 addresses can be assigned, at most?

Answer 29

2^32 = ~4 billions

Question 30

Which output is produced by the command echo "Hello Helene, how are you?" | sed -E s/H/X/g?

Answer 30

Xello Xelene, how are you?

Question 31

ICANN is an abbreviation for…

Answer 31

Internet Corporation for Assigned Names and Numbers

Question 32

Suppose each of the following words appears in input.txt in a different line: “anna”, “sara”, “ole”, “xavier”. Which output is produced by the command cat input.txt | grep -E "^a"

Answer 32

One line: “anna”

Question 33

Which words match the regular expression /ab+cd*/

Answer 33

“aaabc”, “abbcddd”, “abcd”, “xabcde”

Question 34

What technologies make the core of the Web

Answer 34

URL, HTTP, HTML

Question 35

Which UNIX command is used to rename files?

Answer 35

mv