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CSCI463: Introduction to Computer Networks-2025FALL-LECT-02

CSCI463: Introduction to Computer Networks-2025FALL-LECT-02

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TCP header size typically 8 bytes, due to additional fields for managing connections and reliability (e.g., sequence numbers, acknowledgment numbers, etc...)

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If a TCP receiver sends an acknowledgment with ACK = 7000, what does it indicate?

Bytes up to 7000 have been received.

All bytes up to 6999 have been received.

The receiver expects the next byte to be 7001.

The receiver is requesting a retransmission.

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In TCP fairness, how is bandwidth shared among multiple connections?

Randomly distributed

Equally among all connections

Based on packet size

Proportionally based on connection priority

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In TCP, if three duplicate ACKs are received, it indicates:

Perfect network communication

A flow control issue

Successful data transfer

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Hosts A & B are
communicating over a TCP connection. Host A has received from host B all
bytes up to 1288 and B has received from A all bytes up to 345.

A sent a segment containing 70

bytes of data with source and destination port numbers of 540 and 820. What

are the contents of the indicated header fields?

case 2:

Then, B sent back a segment

of 200 bytes. What are the

contents of the indicated header fields?

header fields in case 1 are

header fields in case 2 are

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A private IP 10.0.0.1 is translated by NAT to public IP 138.76.29.7. Which part does the NAT table store?

Destination IP and port number

Source and destination IPs with ports

Source and destination IPs only

Source IP and a generated port number

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What happens during the slow-start phase of TCP congestion control?

Congestion window decreases exponentially.

Congestion window increases linearly.

Congestion window doubles every RTT.

Packets are transmitted immediately.

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What does TCP use to prevent the receiver's buffer from overflowing?

Congestion control using the Cwnd field

Sequence numbers seq# field

Flow control using the rwnd field

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A TCP segment has a length of 512 bytes, and the sequence number is 1500. What is the number of the last byte of this segment?

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A TCP connection has an estimated RTT of 350 ms and sends a segment at time t = 0. If the ACK is received at t=300, what is the measured Sample RTT?

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