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Which two scenarios need a proper DNS configuration on Expressway servers?

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Which two scenarios need a proper DNS configuration on Expressway servers? (Choose two.)

A.

Expressway servers verify the common name attribute in server certificates.

B.

Expressway servers route calls based on SIP URI.

C.

Admins avoid IP address configuration for neighbor zone peers.

D.

Expressway servers use NTP peer authentication for secure time updates.

E.

Admins download software updates from the Cisco website via WebUI.

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Which zone is required on a B2B deployment between Expressway-C and Expressway-E?
An organization wants to be able to call IP addresses and URI addresses.
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