The Transport Layer: TCP and UDP

The Transport Layer: TCP and UDP

1. Transmission Control Protocol

   • Reliable
   • Connection-oriented
     • Will "setup" a connection before it starts sending any data
       • Called 3 way handshake
         • A sends B a message asking to talk
           • B sends A a message saying I accept that you want to talk to me, I want to talk to you as well
             • A sends B a message saying I accept you wanting to talk to me
   • Sequencing
   • Downloads, File sharing, Printing
   • Can do retransmissions

2. User Datagram Protocol

   • Unreliable or best-effort protocol
     • Limited error correction because we have a checksum
   • Connectionless
     • Does not set up a connection - Just sends data
   • No sequencing
   • VoIP, Video(streaming)
   • No data-recovery features

3. Used to determine which application the data is meant

   • How we go from the transport layer up to the higher layers in the OSI-model
   • 32-bits for sequence numbers and 32-bit for the acknowledgment (ACK) reserved
     • Window Size: Specifies how many bytes of data you will send before you want any acknowledgement from the other side
       • Flags: Where TCP sets the different message types like "SYN" or "ACK"
       • The stuff we are trying to send

Images and files in the map