Computer Science - TCP/IP layers

what are the four layers in the TCP/IP structure

1. application

2. transport

3. network

4. link

what does a data packet consist of

1. sender/receiver IP address

2. packet length

3. sequence number

4. actual data being transported

5. checksum

what is used in the application layer

web browsers

what are the protocols for the application layer

1. HTTP and HTTPS

2. POP3 and IMAP

what does the transport layer do

enables communication between hosts and splits data into packets

what protocol is found in the transport layer

TCP

what does the network layer do

addresses and packages data for transmission. It also routes the packets across the network

what protocol is used in the network layer

IP

what does the link layer do

it is the physical network hardware/connection between devices, such as NIC

what protocol is used in the link layer

1. ethernet

2. wi-fi

what is the difference between HTTP and HTTPS

HTTPS is a secure version of HTTP

what does HTTP and HTTPS do

allows communication between clients and servers

what is the difference between POP3 and IMAP

both protocols are used to download emails from an email server, but when POP3 is used, the email is removed from the server, but if IMAP is used, a copy of the email is retained.