Prepare with Cisco 642-642 exam practice material, pass for sure
Updated: May 27, 2026
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Cisco Quality of Service (QoS) Sample Questions:
1. Which algorithm (discard method) does WRED use to determine which packets will be dropped when the average queue length becomes larger than the user-specified maximum threshold?
A) weighted early discard
B) tail discard
C) packet size based discard
D) random discard
2. Which QoS mechanism adds IP Precedence information for prefixes into the FIB table?
A) Class-Based Marking
B) LLQ
C) QoS pre-classify
D) Class-Based WRED
E) AutoQoS
F) QPPB
3. DRAG DROP
4. What is the purpose of using multiactions traffic policing?
A) so that exceed traffic can be shaped and violate traffic can be policed
B) so that conform traffic from different flows can be marked with different DSCPs
C) so that class-based policing can mark at Layer 2 and Layer 3 at the same time
D) so that traffic can be policed using two separate rates
E) so that conform, exceed, and violate traffic can be marked with different CLPs
5. What describes the use of best-effort service with overprovisioning?
A) ensuring quality of service by being able to load balance across links in times of congestion
B) ensuring constant availability by provisioning multiple paths through the network
C) ensuring quality of service by deploying sophisticated prioritization and congestion management mechanisms
D) ensuring availability and quality of service by always provisioning key services across at least two service provider networks
E) ensuring quality of service by providing more than the aggregate bandwidth required
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: F | Question # 3 Answer: Only visible for members | Question # 4 Answer: C | Question # 5 Answer: E |
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