TCP/IP · Transport interview questions

54 real TCP/IP · Transport questions from the Networking bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is TCP three-way handshake?

Junior
  1. A.acknowledging non-contiguous received segments to improve retransmission efficiency
  2. B.the period a closing socket waits to ensure delayed segments are handled before reuse
  3. C.the SYN, SYN-ACK, ACK exchange that establishes a TCP connection
  4. D.the field that orders bytes in a TCP stream for reliable reassembly
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3. Which statement is correct?

Junior
  1. A.TCP three-way handshake — the SYN, SYN-ACK, ACK exchange that establishes a TCP connection
  2. B.TCP three-way handshake — a 16-bit identifier distinguishing application endpoints on a host
  3. C.TCP three-way handshake — a connection-oriented transport protocol providing reliable, ordered byte delivery
  4. D.TCP three-way handshake — coalescing small TCP writes to reduce the number of tiny packets on the wire
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4. What is TCP?

Junior
  1. A.a connection-oriented transport protocol providing reliable, ordered byte delivery
  2. B.a 16-bit identifier distinguishing application endpoints on a host
  3. C.the FIN/ACK exchange that gracefully closes a TCP connection in both directions
  4. D.a flow-control mechanism limiting unacknowledged data in flight
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6. Which statement is correct?

Junior
  1. A.TCP — periodic probes that detect whether an idle connection is still alive
  2. B.TCP — the period a closing socket waits to ensure delayed segments are handled before reuse
  3. C.TCP — a connection-oriented transport protocol providing reliable, ordered byte delivery
  4. D.TCP — the field indicating the next byte a TCP receiver expects
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7. What is UDP?

Junior
  1. A.a connectionless transport protocol offering low-overhead, best-effort delivery
  2. B.a 16-bit identifier distinguishing application endpoints on a host
  3. C.an option that allows receive windows larger than 64 KB for high-bandwidth links
  4. D.the field that orders bytes in a TCP stream for reliable reassembly
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9. Which statement is correct?

Junior
  1. A.UDP — a 16-bit identifier distinguishing application endpoints on a host
  2. B.UDP — the largest payload a TCP segment can carry, derived from the path MTU
  3. C.UDP — the period a closing socket waits to ensure delayed segments are handled before reuse
  4. D.UDP — a connectionless transport protocol offering low-overhead, best-effort delivery
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10. What is Port number?

Junior
  1. A.the largest payload a TCP segment can carry, derived from the path MTU
  2. B.acknowledging non-contiguous received segments to improve retransmission efficiency
  3. C.an option that allows receive windows larger than 64 KB for high-bandwidth links
  4. D.a 16-bit identifier distinguishing application endpoints on a host
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12. Which statement is correct?

Junior
  1. A.Port number — a 16-bit identifier distinguishing application endpoints on a host
  2. B.Port number — a connection-oriented transport protocol providing reliable, ordered byte delivery
  3. C.Port number — acknowledging non-contiguous received segments to improve retransmission efficiency
  4. D.Port number — resending segments that were not acknowledged within the timeout
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13. What is Socket?

Junior
  1. A.an option that allows receive windows larger than 64 KB for high-bandwidth links
  2. B.resending segments that were not acknowledged within the timeout
  3. C.the period a closing socket waits to ensure delayed segments are handled before reuse
  4. D.the combination of an IP address and port that identifies a connection endpoint
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15. Which statement is correct?

Junior
  1. A.Socket — a flow-control mechanism limiting unacknowledged data in flight
  2. B.Socket — periodic probes that detect whether an idle connection is still alive
  3. C.Socket — the FIN/ACK exchange that gracefully closes a TCP connection in both directions
  4. D.Socket — the combination of an IP address and port that identifies a connection endpoint
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16. What is TCP sliding window?

Mid
  1. A.a flow-control mechanism limiting unacknowledged data in flight
  2. B.the field that orders bytes in a TCP stream for reliable reassembly
  3. C.an option that allows receive windows larger than 64 KB for high-bandwidth links
  4. D.a connectionless transport protocol offering low-overhead, best-effort delivery
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18. Which statement is correct?

Mid
  1. A.TCP sliding window — resending segments that were not acknowledged within the timeout
  2. B.TCP sliding window — a flow-control mechanism limiting unacknowledged data in flight
  3. C.TCP sliding window — acknowledging non-contiguous received segments to improve retransmission efficiency
  4. D.TCP sliding window — algorithms like slow start and congestion avoidance that adapt send rate to network capacity
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19. What is TCP four-way termination?

Mid
  1. A.the SYN, SYN-ACK, ACK exchange that establishes a TCP connection
  2. B.the FIN/ACK exchange that gracefully closes a TCP connection in both directions
  3. C.the field indicating the next byte a TCP receiver expects
  4. D.an option that allows receive windows larger than 64 KB for high-bandwidth links
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21. Which statement is correct?

Mid
  1. A.TCP four-way termination — a 16-bit identifier distinguishing application endpoints on a host
  2. B.TCP four-way termination — the FIN/ACK exchange that gracefully closes a TCP connection in both directions
  3. C.TCP four-way termination — the field indicating the next byte a TCP receiver expects
  4. D.TCP four-way termination — coalescing small TCP writes to reduce the number of tiny packets on the wire
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22. What is TCP retransmission?

Mid
  1. A.the SYN, SYN-ACK, ACK exchange that establishes a TCP connection
  2. B.the field that orders bytes in a TCP stream for reliable reassembly
  3. C.resending segments that were not acknowledged within the timeout
  4. D.the FIN/ACK exchange that gracefully closes a TCP connection in both directions
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24. Which statement is correct?

Mid
  1. A.TCP retransmission — a connectionless transport protocol offering low-overhead, best-effort delivery
  2. B.TCP retransmission — the field that orders bytes in a TCP stream for reliable reassembly
  3. C.TCP retransmission — resending segments that were not acknowledged within the timeout
  4. D.TCP retransmission — the field indicating the next byte a TCP receiver expects
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25. What is TCP TIME_WAIT state?

Mid
  1. A.the largest payload a TCP segment can carry, derived from the path MTU
  2. B.the period a closing socket waits to ensure delayed segments are handled before reuse
  3. C.a 16-bit identifier distinguishing application endpoints on a host
  4. D.a connectionless transport protocol offering low-overhead, best-effort delivery
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26. Which term means: "the period a closing socket waits to ensure delayed segments are handled before reuse"?

Mid
  1. A.TCP sliding window
  2. B.TCP TIME_WAIT state
  3. C.TCP four-way termination
  4. D.TCP selective acknowledgment (SACK)
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27. Which statement is correct?

Mid
  1. A.TCP TIME_WAIT state — the FIN/ACK exchange that gracefully closes a TCP connection in both directions
  2. B.TCP TIME_WAIT state — a connection-oriented transport protocol providing reliable, ordered byte delivery
  3. C.TCP TIME_WAIT state — an option that allows receive windows larger than 64 KB for high-bandwidth links
  4. D.TCP TIME_WAIT state — the period a closing socket waits to ensure delayed segments are handled before reuse
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28. What is TCP congestion control?

Senior
  1. A.the period a closing socket waits to ensure delayed segments are handled before reuse
  2. B.acknowledging non-contiguous received segments to improve retransmission efficiency
  3. C.a flow-control mechanism limiting unacknowledged data in flight
  4. D.algorithms like slow start and congestion avoidance that adapt send rate to network capacity
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30. Which statement is correct?

Senior
  1. A.TCP congestion control — algorithms like slow start and congestion avoidance that adapt send rate to network capacity
  2. B.TCP congestion control — the field indicating the next byte a TCP receiver expects
  3. C.TCP congestion control — resending segments that were not acknowledged within the timeout
  4. D.TCP congestion control — the FIN/ACK exchange that gracefully closes a TCP connection in both directions
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