protocols

Question 1

what are protocols

Answer 1

• rules that define methods of communicating data between 2 or more digital devices
• they ensure the transmission of data always follows a set procedure

Question 2

TCP/IP (transmission control protocol and internet protocol)

Answer 2

• the are used together as the basic communication language of internet
• data sent over internet is broken into ‘packets’ to enable it to be sent more efficiently and each packet is sent individually then reassembled in the end

Question 3

TCP is used for..

Answer 3

• to create the packets and reassemble them at the end

Question 4

IP is used for..

Answer 4

• to route packets to the intended computer by using computer’s IP address

Question 5

Email; simple mail transfer protocol (SMTP)

Answer 5

• transfers emails between mail servers

Question 6

Email; post office protocol 3 (POP3)

Answer 6

• to retrieve emails from the email server

- allows us to download messages to our client software for online reading

Question 7

Email; internet message access protocol (IMAP)

Answer 7

• retrieve emails from the mail server

syncs emails to the email server instead of downloading it

Question 8

voice and video calls; session initiation protocol (SIP)

Answer 8

• used to create and control and end VOIP connections

Question 9

voice and video calls; real time transport protocol (RTP)

Answer 9

• designed to transfer audio and video over IP based networks

Question 10

web pages: hypertext transfer (HTTP)

Answer 10

• allow web servers and browsers to transfer files over the internet
• it’s how we access the world wide web

Question 11

web pages: HTTPS

Answer 11

• secure version of HTTP

- it uses public key cryptography to encrypt communications between web browser and server

Question 12

web pages file transfer (FTP)

Answer 12

• transfer files over a network

- it is used to upload files to a server and it downloads larger files

Question 13

security protocols; SSL and TLS

Answer 13

• used to ensure that transactions over networks are kept safe
• SSL is being phased out and replaced by TLS