Transport Layer

The Transport Layer is responsible for communication between applications running on different machines.

It answers:

• Should the data be delivered reliably?
• Should missing data be resent?
• Should data arrive in order?
• Which application on the destination machine should receive it?

The two main protocols are:

• TCP
• UDP

What comes under Transport Layer?

Transport Layer
├── TCP
├── UDP
└── TCP vs UDP

Study TCP first, then UDP, then compare them.