Refer to the exhibit. When making a call to a MRA client, what are the combinations of protocol on each of the different sections A-B-C?

Question

Exhibit

Options

• AIP TCP/TLS(A) +SIP TCP/TLS (B) +TLS (C)
• BSIP TLS (A) +SIP TLS (B) +SIP TLS (C)
• CSIP TCP/TLS (A) + SIP TLS (B) + SIP TLS (C)
• DSIP TCP/TLS +SIP TCP/TLS (B) + SIP TCP/TLS (C)

• A
  4% (1)
• C
  85% (23)
• D
  11% (3)

Explanation

In the Cisco Mobile and Remote Access (MRA) architecture, signaling traverses three distinct segments: Section A is the external segment between the remote Jabber client and the Expressway-E (internet-facing). Jabber initiates a SIP connection that may start as TCP and is upgraded/wrapped with TLS - hence SIP TCP/TLS. Section B is the DMZ traversal between Expressway-E and Expressway-C, which uses SIP TLS (encrypted end-to-end across the DMZ). Section C is the internal segment between Expressway-C and CUCM, which also uses SIP TLS. Therefore, the correct answer is SIP TCP/TLS (A) + SIP TLS (B) + SIP TLS (C), matching Option C.

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