Which three attributes contribute to the reliability of TCP? Choose three.
A.
Port numbers
B.
EXP bits
C.
Sequence numbers
D.
Acknowledgements
E.
Timers
Explanation:
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A.
C.
D.
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sequence numbers
ACK and timers
if the packet if not received , TCP retransmit the packet.
https://en.wikipedia.org/wiki/Transmission_Control_Protocol
TCP is a reliable stream delivery service that guarantees that all bytes received will be identical with bytes sent and in the correct order. Since packet transfer over many networks is not reliable, a technique known as positive acknowledgment with retransmission is used to guarantee reliability of packet transfers. This fundamental technique requires the receiver to respond with an acknowledgment message as it receives the data. The sender keeps a record of each packet it sends. The sender also maintains a timer from when the packet was sent, and retransmits a packet if the timer expires before the message has been acknowledged. The timer is needed in case a packet gets lost or corrupted.[2]
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