SSCA RTP & Media Transport 2

Question 1

What does RTCP stand for?

Accepted Answer

RTP Control Protocol

Answer

RTCP stands for RTP Control Protocol and provides out-of-band statistics and control information for an RTP flow, defined alongside RTP in RFC 3550.

Question 2

What percentage of total session bandwidth is typically allocated to RTCP per RFC 3550?

Accepted Answer

5%

Answer

RFC 3550 recommends that RTCP consume no more than 5% of the total session bandwidth, keeping overhead minimal relative to the media stream.

Question 3

Which RTCP packet type provides statistics from an active media sender?

Accepted Answer

SR (Sender Report)

Answer

The SR (Sender Report) packet contains an NTP timestamp, RTP timestamp, and packet/byte counts sent, and may also include reception report blocks.

Question 4

Which quality metric included in an RTCP Receiver Report measures variability in packet arrival times?

Accepted Answer

Interarrival jitter

Answer

Interarrival jitter, expressed in timestamp units, measures the statistical variance in RTP packet arrival spacing and is a key indicator of network consistency.

Question 5

How is 'jitter' defined in the context of VoIP media transport?

Accepted Answer

Variation in the delay between successive RTP packet arrivals

Answer

Jitter is the variation in packet interarrival delay; high jitter causes choppy audio because packets do not arrive at the consistent intervals needed for smooth playback.

(SSCA) Sip School Certified Associate Practice Test

(SSCA) Sip School Certified Associate Practice Test

SSCA RTP & Media Transport 2