Which three methods are used by a Cisco Unified Border Element to provide network hiding?
(Choose three.)

A.
Back-to-back user agent, replacing all H.323-embedded IP addressing

B.
IP network security boundary

C.
Media flow-through

D.
RSVP

E.
IP network privacy and topology hiding

F.
Intelligent IP address translation for RTP flows

Explanation:
Cisco Unified Border Element can protect the network by hiding the network
addresses and names for both the access (customer) side and the backbone (network core) side.
A CUBE is designed to provide IP network privacy and topology hiding, IP network security
boundary, Intelligent IP address translation for call media and signaling, Back-to-back user agent,
replacing all SIP-embedded IP addressing, History information based topology hiding and call
routing.
http://www.cisco.com/en/US/docs/routers/asr1000/configuration/guide/sbc/sbc_topology_hide.html