Networking

Question 1

What’s the meaning of TCP/IP acronysm?

Answer 1

Transmission Control Protocol / Internet Protocol

Question 2

How many octet do we need to represent an IP Address

Answer 2

4

Question 3

To which class does the subnet 255.0.0.0 belongs?

Answer 3

Class A

Question 4

Which command should we use for seeing IP information?

Answer 4

ip, ifconfig (will be deprecated soon)

Question 5

What’s the purpose of a DNS

Answer 5

To translate from a hostname to an IP address and vice-versa.

Question 6

What is a top level domain (TLD)?

Answer 6

.com, .mx, .edu, those are TLD.

Question 7

Where is the hostname of the machine configure?

Answer 7

/etc/hostname

Question 8

If we want to know the IP of a host in the internet, which command should we use?

Answer 8

host

Question 9

can we configure a name that will be use by DNS in our /etc/hosts file?

Answer 9

No, host names configure in /etc/hosts are local to the Linux System.

Question 10

In which file do we control the order for name resolution?

Answer 10

/etc/nsswitch.conf

Question 11

For what is the port 22 reserved?

Answer 11

SSH

Question 12

For what is the port 443 reserved?

Answer 12

HTTPS

Question 13

In which config file can you map port numbers to port names?

Answer 13

/etc/services

Question 14

What DHCP stands for?

Answer 14

Dynamic Host Configuration Protocol

Question 15

which command should we use to know if we can reach a host or not?

Answer 15

ping

Question 16

what command should we use if we want to see all the hops that our machine needs to make to reach a host?

Answer 16

traceroute

Question 17

Which command should we use if we want to see network information?

Answer 17

netstat

Question 18

Which command should we use to see the traffic of a network

Answer 18

tcpdump