16 lines
571 B
Markdown
16 lines
571 B
Markdown
|
Lecture Topic: Transport Layer overview
|
||
|
|
|
||
|
|
Socket information is a tuple, port number is important
|
||
|
|
|
||
|
|
# Transport Layer
|
||
|
|
## UDP
|
||
|
|
Connectionless transport protocol, no handshake, each segment is handled independently from others
|
||
|
|
|
||
|
|
UDP segment is very simple: an 8 byte header and a payload.
|
||
|
|
It has a source port, destination port, length and checksum
|
||
|
|
|
||
|
|
The checksum in UDP is only for detection, not correction
|
||
|
|
|
||
|
|
As messages are transported through layers, they acquire new headers that wrap the existing packet
|
||
|
|
|
||
|
|
Checksum in UDP is actually optional but is required in TCP and IPv4
|