Which of the following layers of the TCP/IP model maintains data integrity by ensuring that messages are delivered in the order in which they are sent and that there is no loss or duplication?

Question

Options

• ATransport layer
• BLink layer
• CInternet layer
• DApplication layer

• A
  94% (63)
• B
  1% (1)
• C
  3% (2)
• D
  1% (1)

Explanation

The Transport layer is responsible for end-to-end communication reliability, including ordered delivery, error checking, and duplicate suppression - all functions handled by TCP (Transmission Control Protocol), which operates at this layer. The Link layer (B) deals with node-to-node data transfer on a single network segment, such as Ethernet framing and MAC addressing - it has no awareness of full message delivery across a network. The Internet layer (C) handles logical addressing and routing packets from source to destination, but doesn't guarantee order or completeness. The Application layer (D) provides protocols like HTTP and SMTP for user-facing services, relying on the layers below it for delivery guarantees.

Memory tip: Think "TCP = Transport" - TCP's entire purpose is to be the reliable protocol, and reliability means ordering, no loss, no duplication. If a question mentions any of those three guarantees together, the answer is Transport layer.

No community discussion yet for this question.