Exam 302 Topic 1 Question 331 Discussion

Actual exam question for F5's 302 exam
Question #: 331
Topic #: 1
What is the length of the "QR" subfield in the Header field of the DNS Message ?

Suggested Answer: A Vote an answer

The "QR" subfield in the Header field of the DNS Message is actually 1 bit in length, not 4 bits. This bit is used to differentiate between a query and a response in the DNS message. Having a length of 4 bits would not align with the standard DNS message format and would lead to incorrect interpretation of the message.
5 BITS
Explanation:
The "QR" subfield in the Header field of the DNS Message is not 5 bits in length; it is actually 1 bit. This 1-bit field is crucial for distinguishing between a query and a response in the DNS message. Having a length of 5 bits would not align with the standard DNS message format and would introduce inconsistencies in the communication between DNS clients and servers.
The "QR" subfield in the Header field of the DNS Message is 1 bit in length. This bit is used to indicate whether the message is a query (0) or a response (1). It is a crucial part of the DNS message header and plays a significant role in the communication between DNS clients and servers.
Domain
DNS

by Ruby at Sep 23, 2026, 11:20 PM

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