1.3

Question 1

4 Protocol layers

Answer 1

Transport
Application
Network/ Internet
Link/ Physical

Question 2

What is the application layer

Answer 2

Assigns specific protocols based on the data being transferred (web - http/https, files- ftp, email-smtp)

Question 3

What is the transport layer

Answer 3

Splits data up into packets, each packet is assigned a checksum and the order in which to be reassigned, it also assigns which application layer protocol is being used based on the port number for the firewall and to know which server it may need to be sent to (TCP - Reducing errors, UDP - Speed)

Question 4

What is the network layer

Answer 4

IP address header is assigned to each packet, where its going to, where its coming from (protocol - IP)

Question 5

What is the link layer

Answer 5

MAC address is used to determine the physical route across the network

Question 6

What is the point of layering

Answer 6

Can change individual layers without affecting other layers (encapsulation)

Question 7

What is meant by a layer

Answer 7

A group of protocols organised by function

Question 8

What is meant by a model

Answer 8

The conceptual arrangement of protocols and layers0