Which concept is essential for ensuring reliable VoIP service on a cable network by prioritizing certain types of traffic?

Which concept is essential for ensuring reliable VoIP service on a cable network by prioritizing certain types of traffic?

• A. Encryption
• B. Bandwidth Allocation
• C. Error Correction
• D. Quality of Service

Answer: (D)

Quality of Service is the practice of prioritizing certain traffic so that time‑sensitive services like VoIP get preferential treatment on a network. VoIP calls require low latency, minimal jitter, and low packet loss to sound clear; on a shared cable network, other traffic can introduce delays. QoS classifies and marks voice packets, places them into high‑priority queues, and can reserve bandwidth so they traverse the network with minimal delay even when things are busy. The other options don’t focus on prioritizing traffic: encryption protects privacy but doesn’t affect timing; bandwidth allocation ensures capacity but not which traffic gets it; and error correction helps recover from lost data but doesn’t prevent delay.

Quality of Service is the practice of prioritizing certain traffic so that time‑sensitive services like VoIP get preferential treatment on a network. VoIP calls require low latency, minimal jitter, and low packet loss to sound clear; on a shared cable network, other traffic can introduce delays. QoS classifies and marks voice packets, places them into high‑priority queues, and can reserve bandwidth so they traverse the network with minimal delay even when things are busy. The other options don’t focus on prioritizing traffic: encryption protects privacy but doesn’t affect timing; bandwidth allocation ensures capacity but not which traffic gets it; and error correction helps recover from lost data but doesn’t prevent delay.