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Which of the following operations needs to be performed when you log in to the SC as the admin user using the CLI for the first time?
Answer : B
On first CLI login, you must change the default admin password to secure the SC; other network settings can be configured as needed afterward.
Which of the following statements is true about image sampling?
Answer : A
YUV 4:2:0 subsamples chroma by a factor of two in both horizontal and vertical dimensions, reducing total data to half of the full-resolution YUV 4:4:4 format.
FILL in BLANK
Assume endpoints T1 and T2 are registered with the same SC node zone (signaling routing is disabled on the SC). After T1 calls the number of T2 using H.323, T1 and T2 communicate with each other. In this process, a total of ____________ TCP connection(s) need to be established between T1 and T2. (Enter an Arabic numeral.)
Answer : A
Assume that a dual-channel audio file uses the PCM encoding, the sampling frequency is 8 kHz, and each quantized sample value corresponds to an 8-bit binary code. What is the encoding rate (kbit/s) of the audio file?
Answer : A
Dual-channel PCM at 8 kHz with 8 bits per sample yields 8,000 8 = 64 kbit/s per channel; two channels give 64 2 = 128 kbit/s.
In the encrypted conference scenario, the SIP transmission type must be set to TLS on both the MCU and endpoint.
Answer : A
To secure SIP signaling in an encrypted conference, both the MCU and endpoints must use TLS as the transport for SIP messages.
