Which of the following services or protocols can be made more secure by implementing H.235 extensions with DES?
A. DNS
B. H.323
C. SIP
D. STP
B
Explanation: H.323 is a protocol used in video conferencing. H.235 extensions with DES can be used to provide security and privacy for H.323. The H.235 data encryption is implemented on the RTP layer, supporting algorithms ranging from DES to Triple DES and AES.
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