TCP & UDP

𝙏𝘾𝙋/𝙐𝘿𝙋

𝙏𝘾𝙋:

- TCP is connection oriented - once a connection is established, data can be sent bidirectionally over that conection.

- TCP carries out sequencing to ensure segments are processed in the correct order and none are missing.

- TCP is reliable - the receiving host sends acknowledgments  back to the sender, and lost segments are resent.

- TCP performs flow control, where :

Flow control means that if the sender is sending at a rate too high, and the receiver can't handle it, the receiver sends signal back to the sender telling it to slow down.

𝙐𝘿𝙋:

- UDP is not connection oriented.

- UDP does not carry out sequencing to ensure segments are processed in the correct order and none are missing.

- UDP is not reliable - the receiving host doesn't send acknowledgments back to the sender.

- UDP doesn't perform flow control.

𝙏𝘾𝙋/𝙐𝘿𝙋 𝘼𝙥𝙥𝙡𝙞𝙘𝙖𝙩𝙞𝙤𝙣𝙨:

- Application developers will typically choose the use of TCP for traffic which requires reliability.

Examples: web browsing, text chat, bank transactions, File transfer.

- Real time applications such as voice and video can't afford the data overhead of TCP, so they use UDP.

Examples: streaming video, streaming radio, voice over IP calls, multiplayer games.

- Some applications can use both TCP and UDP.

𝑪𝒐𝒎𝒎𝒐𝒏 𝒂𝒑𝒑𝒍𝒊𝒄𝒂𝒕𝒊𝒐𝒏𝒔 𝒂𝒏𝒅 𝒕𝒉𝒆𝒊𝒓 𝒅𝒆𝒔𝒕𝒊𝒏𝒂𝒕𝒊𝒐𝒏 𝒑𝒐𝒓𝒕𝒔:

𝙏𝘾𝙋:

- FTP (21), SSH(22), Telnet(23), HTTP(80), HTTPS(443)

𝙐𝘿𝙋:

-TFTP(69), SNMP(161).

𝙏𝘾𝙋 𝙖𝙣𝙙 𝙐𝘿𝙋:

-DNS(53)