You are configuring a Cisco IOS Firewall on a WAN router that is operating as a Trusted Relay
Point (TRP) in a voice network. Which feature must you configure to open data-channel pinholes
for voice packets that are sourced from a TRP within the WAN?
A.
CAC
B.
ACL
C.
CBAC
D.
STUN
Correct !
STUN (Session Traversal Utilities for NAT) is a standardized set of methods and a network protocol to allow an end host to discover its public IP address if it is located behind a NAT. It is used to permit NAT traversal for applications of real-time voice, video, messaging, and other interactive IP communications. It is documented in RFC 5389. The STUN URI scheme is documented in RFC 7064. STUN is intended to be a tool to be used by other protocols, such as ICE.
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Hola
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Answer is correct:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_data_cbac_fw/configuration/15-mt/sec-data-cbac-fw-15-mt-book/sec-cbac-fw-sup-trp.html
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