Question: In TCP, urgent data requires the urgent pointer field as well as the URG bit (to be set) in the _______ field.
Answer:
- In TCP, urgent data requires the urgent pointer field as well as the URG bit (to be set) in the TCP header's Control Bits field.
- The urgent pointer is a 16-bit field in the TCP header that is used to indicate the end of the urgent data within a TCP segment. It points to the byte following the last urgent data byte and is relative to the sequence number field in the TCP header.
- The URG bit is one of the control bits in the TCP header and is used to indicate the presence of urgent data. When the URG bit is set to 1, it indicates that the urgent pointer field is valid and that the data following the pointer is urgent. If the URG bit is set to 0, then the urgent pointer field is not used, and the segment does not contain urgent data.
- Together, the urgent pointer field and the URG bit allow TCP to support the transmission of urgent data within a stream of data. When a receiver receives a TCP segment with urgent data, it can process the urgent data immediately and notify the application if necessary.
MCQ: In TCP, urgent data requires the urgent pointer field as well as the URG bit (to be set) in the _______ field.
Correct Answer:
A. control
Explanation:
- In TCP, urgent data requires the urgent pointer field as well as the URG bit (to be set) in the TCP header's Control Bits field.
- The urgent pointer is a 16-bit field in the TCP header that is used to indicate the end of the urgent data within a TCP segment. It points to the byte following the last urgent data byte and is relative to the sequence number field in the TCP header.
- The URG bit is one of the control bits in the TCP header and is used to indicate the presence of urgent data. When the URG bit is set to 1, it indicates that the urgent pointer field is valid and that the data following the pointer is urgent. If the URG bit is set to 0, then the urgent pointer field is not used, and the segment does not contain urgent data.
- Together, the urgent pointer field and the URG bit allow TCP to support the transmission of urgent data within a stream of data. When a receiver receives a TCP segment with urgent data, it can process the urgent data immediately and notify the application if necessary.
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Related Questions
- 1. In TCP, if the ACK value is 200, then byte _______ has been received successfully.
- 2. In TCP, the _______ timer prevents a long idle connection between two TCPs.
- 3. In TCP, the _______ timer is needed to handle the zero window-size advertisement.
- 4. In TCP, Karn's algorithm is used in calculations by the _______ timer.
- 5. In TCP, a special segment called a probe is sent by a sending TCP when the _______ timer goes off.
- 6. __________ control refers to the mechanisms and techniques to keep the load below the capacity.
- 7. In TCP's ________ algorithm the size of the congestion window increases exponentially until it reaches a threshold.
- 8. In TCP's __________ algorithm the size of the congestion window increases additively until congestion is detected.
- 9. ________ treats the two signs of congestion detections, timeout and three duplicate ACKs, in the same way.
- 10. In ______ TCP, when the connection is established, TCP starts the slow start algorithms and sets the <em>ssthresh</em> variable to a pre-agreed value (normally 64 or 128 kilobytes) and the <em>cwnd</em> variable to 1 MSS.
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