Networking

Question 1

What does the application layer of the TCP/IP model do?

Answer 1

Determines which protocol is to be used when transmitting the data

Question 2

What does the transport layer of the TCP/IP model do?

Answer 2

Splits data up into packets, numbers each packet, and applies a port number to each

Question 3

What does the network layer of the TCP/IP model do?

Answer 3

Adds both source and destination IP addresses to each packet, forming sockets

Question 4

What does the link layer of the TCP/IP model do?

Answer 4

Adds the source and destination MAC addresses to packets

Question 5

List every application layer protocol and their ports in order of increasing port number

Answer 5

FTP Data - 20
FTP Control - 21
SSH - 22
Telnet - 23
SMTP - 25
HTTP - 80/8080
POP3 - 110
IMAP - 143
HTTPS - 443

Question 6

What is a subnet mask?

Answer 6

A 32-bit number used to split an IP address into its host ID and network ID using an AND bitwise operator

Question 7

What is latency?

Answer 7

The time taken for a bit to be sent between two devices

Question 8

What is SSH used for?

Answer 8

For transferring data in a secure, encrypted manner

Question 9

What are the 6 main SSH commands?

Answer 9

×cd [filename] - changes to a specified directory
×cd… - move up a file level
×pwd - print the working directory
×cp - copy an image to a specified location
×ls - list all files with a specific extension

Question 10

What are the 3 main FTP commands?

Answer 10

PWD - Print the working directory
CDUP - Change to the parent directory
PASV - Enter passive mode

Question 11

What does POP3 do?

Answer 11

Retrieves email from a server, deleting it from the server when it is on the client device

Question 12

What does IMAP do?

Answer 12

Keeps mail on the sever and on the client in sync

Question 13

What does SMTP do?

Answer 13

Transfers mail from one device to a server