Question

You are capturing packets with a network sniffer and notice a number of packets that are flagged by the sniffer and described as TCP retries. Which layer of the OSI model should you investigate?

Answer 1

Transport Layer

Step-by-step explanation:

• Transport layer is responsible for correcting data transmission errors which is done by requesting retries also called re-transmission of packets in case of data loss or corrupted data.
• Transport layer ensures end to end delivery of data making sure that the data is received correctly and in same order in which it was sent.
• Transmission Control Protocol (TCP) is a protocol in this layer that continues to transmit data packets securely from sender to receiver, identifying packet losses.
• Transport layer works on packet loss issues and corrects data transmission errors.
• It has flow control and error control services manage data transmission rate and ensures data is received without error.
• So in case of transmission errors and re-transmission requests transport layer should be investigated.