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Regarding the characteristics of the TCP protocol, analyze the statements below:
I. Confirms messages that have already been delivered. II. It is optional for it to perform congestion control. III. Delivers messages in order. IV. Is half-duplex.
Which are correct?
Real Exam
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DDanyel
A
Only I and III.
B
Only II and IV.
C
Only I, II and III.
D
Only II, III and IV.
E
I, II, III and IV.
Explanation:
Explanation
Let's analyze each statement about TCP protocol characteristics:
I. Confirms messages that have already been delivered. - CORRECT TCP provides reliable delivery through acknowledgment mechanisms. When a receiver gets a packet, it sends an ACK (acknowledgment) back to the sender, confirming successful delivery.
II. It is optional for it to perform congestion control. - INCORRECT Congestion control is a fundamental, mandatory feature of TCP, not optional. TCP uses algorithms like slow start, congestion avoidance, fast retransmit, and fast recovery to manage network congestion.
III. Delivers messages in order. - CORRECT TCP provides in-order delivery of data. Even if packets arrive out of order (which can happen in IP networks), TCP reorders them before delivering to the application layer.
IV. Is half-duplex. - INCORRECT TCP is full-duplex, not half-duplex. Full-duplex means data can flow in both directions simultaneously. TCP connections allow bidirectional communication with separate sequence numbers and acknowledgments for each direction.
Correct statements: I and III only
Why other options are incorrect:
- Option B (II and IV): Both statements are incorrect
- Option C (I, II, III): Statement II is incorrect
- Option D (II, III, IV): Statements II and IV are incorrect
- Option E (all): Statements II and IV are incorrect
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