Exam 350-801 topic 1 question 179 discussion

B is the best answer but the wording on the question and answer could be better as MRA isn't enabling CTI control via jabber, that exists for onprem whether you have Expressway or not.

Worst question working ever, typical Cisco trying to make questions "hard" and ending up just writing nonsense. Had to get that out of my system. Anyway, that said: A: MRA is not needed for internal endpoints to call other companies, that's B2B instead. B: Only possible right answer. Jabber doesn't necessarily need MRA to use call control on CUCM, but it's the one that makes a little bit of sense. C, D: The whole point of MRA is for clients to connect without using a VPN, so no.

B doesn't require MRA and is possible internally with CUCM alone. C is just untrue. MRA leverages proxy secure firewall traversal and resembles functionality of a VPN in some ways, but it's still NOT a VPN. D... I don't even know what they're trying to say this. This just makes no sense. Honestly, this question sucks. I'm almost inclined to say A because Expressway provides MRA which allows internal SIP calls to be routed from inside one organization, across an unsecure network to another (external) company using the B2B (Business to Business) methodology. Yes, it leaves some of the answer to the imagination, but the other answers just seem to much more wrong...

IT is B

It's B.

Not C. MRA provides a secure connection for Jabber application traffic and other devices with the required capabilities to communicate without having to connect to the corporate network over a VPN. B is the correct answer: MRA allows endpoints such as Cisco Jabber to have their registration, call control, provisioning, messaging and presence services provided by Cisco Unified Communications Manager (Unified CM) when the endpoint is outside the enterprise network. The Expressway provides secure firewall traversal and line-side support for Unified CM registrations. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-7/exwy_b_mra-deployment/exwy_m_mra-overview-and-planning.pdf

Looks like C.. rest are wrong