300-320 · Question #389
A network design team tasked to address congestion, QoS has been implemented but no longer effective? (Choose two)
The correct answer is A. Bundle additional uplinks into logical etherchannels C. Implement highspeed uplink interfaces. QoS can prioritize and manage traffic within the available bandwidth, but it cannot create additional bandwidth. When a network is so congested that QoS is no longer effective, the root cause is insufficient physical bandwidth. The only true remediation is to increase capacity…
Question
A network design team tasked to address congestion, QoS has been implemented but no longer effective? (Choose two)
Options
- ABundle additional uplinks into logical etherchannels
- BConfigure selective packet discard to drop non-critical network traffic
- CImplement highspeed uplink interfaces
- DReconfigure QoS based on intserv
- EUtilize random early detection
How the community answered
(31 responses)- A71% (22)
- B16% (5)
- D10% (3)
- E3% (1)
Explanation
QoS can prioritize and manage traffic within the available bandwidth, but it cannot create additional bandwidth. When a network is so congested that QoS is no longer effective, the root cause is insufficient physical bandwidth. The only true remediation is to increase capacity: (A) bundling additional physical links into EtherChannels aggregates bandwidth and increases total throughput; (C) upgrading to higher-speed interfaces (e.g., 1G to 10G) directly increases the pipe size. Selective packet discard and RED are QoS tools that would still be constrained by the same bandwidth ceiling. Switching from DiffServ to IntServ (reconfiguring to IntServ) changes the QoS model but adds no bandwidth.
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