Chapter 11 Networking

Question 2

What is the standard communication method to send messages between devices known as?

Answer 2

TCP/IP

TCP/IP is also a routing protocol that provides best effort delivery.

Question 3

Name the four layers of the TCP/IP model.

Answer 3

• Application
• Transport
• Internet
• Link

Each layer has a specific job in the communication process.

Question 4

In the context of networking, what does IP represent?

Answer 4

House number

It is a unique number in the network.

Question 5

What does Port refer to in networking?

Answer 5

Which door to use

Ports are used to identify specific services on a device.

Question 6

Define Socket in networking terms.

Answer 6

Combo of IP and Port

Example: 192.168.10.1:23.

Question 7

What are the three components of an IP configuration?

Answer 7

• IP address
• Subnet Mask
• Default Gateway

These components define the network and how to access it.

Question 8

What does the subnet mask define in an IP configuration?

Answer 8

Defines your network/how big of network

It helps distinguish between the network and host parts of an IP address.

Question 9

True or false: The first part of an IP address represents the host.

Answer 9

FALSE

The first part of the IP is the network; the rest is the host.

Question 10

What is the difference between IPv4 and IPv6 addressing?

Answer 10

• IPv4: 32 bit addressing
• IPv6: 128 bit addressing

IPv4 supports ~4.2 million addresses, while IPv6 supports ~340 trillion-trillion-trillion addresses.

Question 11

How do computers browse the Internet using names?

Answer 11

Mapping the name to the IP via DNS

IP addresses are used for routing messages across subnets.

Question 12

What command is used to view the adapters in your system?

Answer 12

$ip link

This command shows the status and MAC of the adapters.

Question 13

What utility can be used to test if you can communicate with a remote computer?

Answer 13

Ping

You need to know the remote IP address to use this utility.

Question 14

What command shows the route table in Linux?

Answer 14

$ip route

The route table helps determine where to send packets.

Question 15

What command is used to show all active sockets?

Answer 15

$ss -a

This command displays all sockets and their connections.

Question 16

What is the purpose of the Network Manager in Linux?

Answer 16

Manages networking

It provides commands to show device info and manage connections.

Question 17

To delete a connection in Network Manager, what command would you use?

Answer 17

$sudo nmcli com del enp2

This command removes the specified connection.

Question 18

What file do you edit to set a computer’s hostname?

Answer 18

/etc/hostname

You can also use the command $sudo set-hostname <name>.</name>

Question 19

What does the hosts file do?

Answer 19

Converts names to IP addresses

It is used for name resolution on the local machine.

Question 20

What does a computer do when it can’t resolve a name or IP address?

Answer 20

Asks a Domain Name Service (DNS) server

The DNS address is specified in /etc/resolv.conf.