ExamTopics Logo
Mail Us[email protected]
Menu
Cisco Discussions
exam questions

Exam 400-051 All Questions

View all questions & answers for the 400-051 exam
Go to Exam

Exam 400-051 topic 2 question 6 discussion

Actual exam question from Cisco's 400-051
Question #: 6
Topic #: 2
[All 400-051 Questions]

Which SIP request method enables reliability of SIP 1xx response types?

  • A. ACK
  • B. PRACK
  • C. OPTIONS
  • D. CANCEL
  • E. REGISTER
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
In order to achieve reliability for provisional responses, we do nearly the same thing. Reliable provisional responses are retransmitted by the TU with an exponentialbackoff. Those retransmissions cease when a PRACK message is received. The PRACK request plays the same role as ACK, but for provisional responses. There is an important difference, however. PRACK is a normal SIP message, like BYE. As such, its own
by kidschannel1988 at April 3, 2025, 4:03 p.m.

Comments

Chosen Answer:
This is a voting comment (?). It is better to Upvote an existing comment if you don't have anything to add.
Switch to a voting comment New
Submit Cancel
Currently there are no comments in this discussion, be the first to comment!
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.

Upvoting a comment with a selected answer will also increase the vote count towards that answer by one. So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.

SaveCancel
exam
Someone Bought Contributor Access for:
SY0-701
London, 1 minute ago