Layer 4 characteristics of OSI layer - Networking

Q.  Consider the following characteristics,

1. Acknowledgments
2. Sequencing
3. Flow control

The above characteristics are indicated in which OSI layer?
- Published on 27 Aug 15

a. Layer 4
b. Layer 7
c. Layer 3
d. Layer 2

ANSWER: Layer 4

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    Discussion

  • Prajakta Pandit   -Posted on 20 Oct 15

    - Layer 4 is the Transport Layer of the OSI model.

    - Transport layer is responsible for end-to-end communication over network.

    - It provides logical communication between application processes running on different hosts within a layered architecture of protocols and other network components.

    - The Transport layer can provide some following services:

      - Acknowledgements
      - Sequencing
      - Flow control

    - Acknowledgements (ACKs) : can be used to indicate packet received correctly.

    - Sequencing : the sequence number for a segment is therefore the byte stream number of the first data byte in the segment. The receiver uses the sequence number to re-order segments arriving out of order and to compute an acknowledgement number. This 32-bit number ensures that data is correctly sequenced. Each byte of data is assigned a sequence number.

    - Flow Control : TCP uses a window mechanisms to control the flow of data.

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