C&D
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Collaboration/enterprise/14/collbcvd/edge.html
Interworking — The capability to interconnect H.323-to-SIP calls for voice, video, and content sharing.
Boundary communications services — While Expressway-C sits in the corporate network, Expressway-E is in the enterprise DMZ and provides a distinct connection point for communication services between the enterprise network and the Internet.
Security — The capability to provide authentication and encryption for both mobile and remote access and business-to-business communications.
C and D is correct
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Collaboration/enterprise/12x/120/collbcvd/edge.html#:~:text=The%20core%20components%20of%20the%20Collaboration%20Edge%20architecture,PSTN%20voice%20gateway%2C%20for%20direct%20audio%20PSTN%20connectivity
Agree that should be CD. Answer A is wrong anyways cause you can setup the Expressways to provide B2B encryption. And the Expressway-E sits on the DMZ.
Correct Answers are C and D. From the first reference link:
The Expressway-C and Expressway-E pair performs the following functions:
Interworking — The capability to interconnect H.323-to-SIP calls for voice, video, and content sharing.
Boundary communications services — While Expressway-C sits in the corporate network, Expressway-E is in the enterprise DMZ and provides a distinct connection point for communication services between the enterprise network and the Internet.
Security — The capability to provide authentication and encryption for both mobile and remote access and business-to-business communications.
Hence, answer is C and D
I am no so sure about C. Expressway E provides communications services between the enterprise and the Internet, but it is totally different to say that provides a "perimeter network". The only thing that provides a perimeter network is something called demilitarized zone (DMZ) that divides the corporate network and Intenet. Expressway E does not provides perimeter network, no way.
with A I've a problem that is clearly says Exp-C doesn't provide encryption for B2B calls. According to SRND for Edge infrastructure it is recommended to set media encryption on B2B traversal zone to best effort, as not all far end endpoint might support TLS. Answer says it doesn't provide encryption, where it is partial truth. Whereas for answer C I guess it again wording problem. Like you said it doesn't provide perimeter, but from all remaining answer this one sounds the most probably.
upvoted 2 times
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