YEAR 1 CO1 WEEK 23 PROTOCOLS

Question 1

Define protocol.

Answer 1

Set of rules that govern communication and/or data transmission.

Question 2

Describe the Layer Model.

Answer 2

Arranged protocols in a way that they can only interact with the layers directly above or below them.

Question 3

What are the benefits of the Layer Model.

Answer 3

Can map how protocols relate/interact with one another.
Roughly recognise what protocols do by what layer its in.
Used as hard to conceptualise complex systems such as network communication.

Question 4

Describe Application Layer.

Answer 4

Layer where communication process begins.
Interacts directly with software application such as Web browsers and email clients.
Prepares data for transmission by converting into format that can be sent + received over the network.

Question 5

Describe Transport Layer.

Answer 5

Receives data from application layer.
Responsible for end-to-end communication between source and destination.
Breaks data into smaller equal parts called packets.
Each assigned numbers so can be reassembled in the correct order.

Question 6

Describe Internet Layer.

Answer 6

Receives packets from transport layer.
Adds header to each packet containing senders IP address + recievers IP address.
Responsible for routing each packet across network using the IP addresses in the headers.

Question 7

Describe the Data Link/Network Layer.

Answer 7

Receives packets from Internet Layer and prepares for transmission over physical network.
Translates digital packets into electrical, optical or wireless signal.
On receiving end translated back to digital packets.