TCS Placement: Sample Questions 222 - 222 of 502
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Question 222
Explanation
The Transport Layer is responsible for source-to-destination delivery of the entire message. It provides following functions:
- Service-point Addressing
- Transport Layer header includes service point address that is a port address.
- This layer gets the message to the correct process on the computer unlike Network Layer, which gets each packet to the correct computer.
- Segmentation and reassembly
- A message is divided into segments; each segment contains sequence number, which enables this layer in reassembling the message.
- Message is reassembled correctly upon arrival at the destination and replaces packets lost in transmission.
- Connection Control
- It includes 2 types:
- Connectionless Transport Layer: Each segment is considered an independent packet delivered to the transport layer at the destination machine.
- Connection Oriented Transport Layer: Before delivering packets, connection is made with transport layer at the destination machine.
- Flow Control
This layer performs end-to-end flow control.
- Error Control
- This layer performs end-to-end error correction to ensure complete message at the receiving transport layer.
- Error correction is done through retransmission.