Network

Question 1

TCP/IP protocol layering

Answer 1

Transmission Control Protocol / Internet Protocol Layering

Application layer: Identifies what protocol needs to be used
Transport layer: Splits up data into packets, numbers them
Network layer: Adds the source and destination IP addresses, routers user IP addresses to forward the packets
Link layer: Adds the MAC address, identifying the Network Interface Cards

Question 2

Example of protocols

Answer 2

Hypertext Transfer Protocol: Web pages

File Transfer Protocol: Transmission of files over networks

POP3 (Post Office Protocol): Emails

Internet Protocol / Transmission Control Protocol: Transfers packets through networks

Question 3

Data Packet Anatomy

Answer 3

Header: IP address, Protocol being used, Order
Payload: The raw data
Trailer: Checksum: Detects any errors

Question 4

Firewall function

Answer 4

Prevents unauthorized access to a network
Consists of 2 network inface cards, between the user and the Internet. Compares the packets against rules.

Question 5

Proxies defintion and advantages

Answer 5

Collects and sends data on behalf of the user
+ Privacy
+ Reduce web traffic

Question 6

Network Interface Card function

Answer 6

Connects a device to a network, has a MAC address

Question 7

Switch function

Answer 7

Directs flow of data in a network (often star topology)

Question 8

WAP

Answer 8

Allows a device to connect to a network in mesh networks wirelessly

Question 9

Router

Answer 9

Connects two or more networks together