Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsMedium
A network engineer is configuring a network device that needs to prioritize certain types of traffic, such as Voice over IP (VoIP) and video conferencing, over less time-sensitive traffic like email and file transfers. Which networking concept is being applied here to ensure critical applications receive adequate bandwidth and low latency?
- AQuality of Service (QoS)
- BNetwork Address Translation (NAT)
- CLoad Balancing
- DSpanning Tree Protocol (STP)
Show answer & explanationAnswer & explanation
Correct answer: A. Quality of Service (QoS)
Quality of Service (QoS) is a set of technologies that manage network traffic to reduce packet loss, latency, and jitter on the network. It prioritizes specific types of traffic (like VoIP and video) to ensure they receive preferential treatment and maintain a high level of performance.
Why the other options are wrong
- B. NAT translates private IP addresses to public IP addresses, primarily for internet access, and is unrelated to traffic prioritization.
- C. Load balancing distributes network traffic across multiple servers or links to improve resource utilization and responsiveness, not to prioritize specific traffic types.
- D. STP prevents loops in switched networks by blocking redundant paths, which is a layer 2 function and unrelated to traffic prioritization.
Quality of Service (QoS)
Quality of Service (QoS) refers to technologies that manage network resources to minimize the impact of network congestion. It ensures that critical applications receive the necessary bandwidth and priority for optimal performance by prioritizing specific traffic types.
- Prioritizes critical network traffic (e.g., VoIP, video).
- Reduces latency, jitter, and packet loss.
- Manages bandwidth allocation.
- Implemented on routers, switches, and firewalls.
Memory trick: QoS: 'Quality' for VIP traffic, 'Service' for all.