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Exam 1z0-404 topic 1 question 14 discussion

Actual exam question from Oracle's 1z0-404
Question #: 14
Topic #: 1
[All 1z0-404 Questions]

You are examining a SIP packet. There is no final response to the ACK method.
What is the reason for this?

  • A. The ACK method was defined only in RFC 2543 and it has been deprecated.
  • B. The ACK method is part of the INVITE transaction.
  • C. The ACK method is an exception in RFC 3261.
  • D. The ACK method is an optional SIP method.
  • E. The ACK method was replaced with the CANCEL method in RFC 3261.
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Suggested Answer: B 🗳️
by Iamrandom at May 14, 2020, 2:43 p.m.

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Iamrandom
Highly Voted 1 year, 8 months ago
Correct answer is C. ACK is an execption and doesn’t require any response; BTW its Cseq is NOT the same as the INVITE so it belongs to another transaction.
upvoted 6 times
Iamrandom
1 year, 7 months ago
another exception: according to RFC, when responding to 200 OK, ACK's Cseq MUST be the same as the transaction it's acknowledging. (section 13 of RFC)
upvoted 1 times
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wakkice
Most Recent 3 months, 3 weeks ago
B, The ACK request confirms that the client has received a final response to an INVITE request. (ACK is used only with INVITE requests.) In RFC3261 : Regular Transaction: A regular transaction is any transaction with a method other than INVITE, ACK, or CANCEL.
upvoted 1 times
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