EC-Council
312-50V9 · Question #596
312-50V9 Question #596: Real Exam Question with Answer & Explanation
The correct answer is C: PSH. The TCP PSH flag instructs the sender to flush its buffer and transmit data immediately, bypassing normal TCP buffering.
Question
This TCP flag instructs the sending system to transmit all buffered data immediately.
Options
- ASYN
- BRST
- CPSH
- DURG
- EFIN
Explanation
The TCP PSH flag instructs the sender to flush its buffer and transmit data immediately, bypassing normal TCP buffering.
Common mistakes.
- A. SYN synchronizes sequence numbers to initiate the TCP three-way handshake and has no role in controlling data buffer flushing.
- B. RST abruptly terminates a TCP connection or rejects an invalid incoming segment and is unrelated to buffered data transmission.
- D. URG marks a segment as containing urgent data and sets the urgent pointer, indicating out-of-band priority data, but does not flush the send buffer.
- E. FIN signals the graceful closure of one half of a TCP connection, indicating no more data will be sent, and does not force transmission of buffered data.
Concept tested. TCP PSH flag for immediate buffer flush and delivery
Reference. https://www.rfc-editor.org/rfc/rfc793
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