Conference Call Web Conference Protocols 2 — Questions and Answers
Question 1: Which transport protocol does WebRTC primarily use for low-latency audio and video media streams?
- TCP
- UDP (Correct answer)
- FTP
- SMTP
Correct answer: UDP
WebRTC favors UDP because its lower latency tolerates occasional packet loss better than TCP retransmissions.
Question 2: What is the main purpose of a STUN server in a web conferencing session?
- Encrypt media end-to-end
- Discover a device's public IP and port behind NAT (Correct answer)
- Record the meeting
- Allocate breakout rooms
Correct answer: Discover a device's public IP and port behind NAT
STUN lets a client learn its public-facing address so peers can attempt a direct connection through NAT.
Question 3: When a direct peer-to-peer path fails, which server type relays the media traffic?
- TURN server (Correct answer)
- DNS server
- Proxy cache
- Load balancer
Correct answer: TURN server
A TURN server relays media when NAT or firewall rules block a direct peer connection.
Question 4: Which framework does WebRTC use to negotiate the best connection path between peers?
- ICE (Correct answer)
- OAuth
- REST
- CORS
Correct answer: ICE
ICE gathers and tests candidate address pairs to select the optimal connectivity path.
Question 5: What protocol secures the media payload in a WebRTC session?
- SRTP (Correct answer)
- HTTP
- POP3
- Telnet
Correct answer: SRTP
SRTP encrypts and authenticates the real-time media, and WebRTC mandates it.
Question 6: In SDP offer/answer exchange, what is being negotiated between participants?
- Meeting passwords
- Media capabilities and codecs (Correct answer)
- Calendar invites
- Recording storage location
Correct answer: Media capabilities and codecs
SDP describes each side's media formats, codecs, and parameters so they can agree on compatible settings.
Question 7: Which signaling-related task is NOT defined by the WebRTC standard itself?
- Media encryption
- Codec negotiation format
- The signaling channel mechanism (Correct answer)
- ICE candidate gathering
Correct answer: The signaling channel mechanism
WebRTC deliberately leaves the signaling transport to the application, commonly using WebSocket or HTTP.
Conference Call Web Conference Protocols 2
Which transport protocol does WebRTC primarily use for low-latency audio and video media streams?