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Exam 1z0-404 topic 1 question 62 discussion

Actual exam question from Oracle's 1z0-404
Question #: 62
Topic #: 1
[All 1z0-404 Questions]

How does the Session Border Controller ensure that a pinhole is kept open for persistent communication to a SIP endpoint behind a NAT device?

  • A. by changing the expires= parameter to a defined value in 200 OK responses to REGISTERs
  • B. by changing the expires= parameter to a defined value in 200 OK responses to INVITEs
  • C. by issuing PINGs to the endpoint's NAT address
  • D. by sending Address Resolution Protocol (ARP) requests at a defined frequency
  • E. by sending messages at a defined frequency
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Suggested Answer: D 🗳️
by Iamrandom at May 15, 2020, 1:58 p.m.

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Iamrandom
1 year ago
correct answer is E (sent message is OPTION)
upvoted 2 times
Guillermus84
10 months, 3 weeks ago
Correct answer is A. SIP OPTIONs are used on Dynamic Hosted NAT Traversal. But the SBC will still change the value of the "expire" header on the 200 OK of the REGISTER to force the endpoint to re-register after a short period of time.
upvoted 9 times
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