| Question 1 | What is the maximum acceptable amount of one-way delay (per leg) for VoIP connections? A. 20ms B. 60ms C. 100ms D. 200ms
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| A1: | Answer B is correct. The maximum acceptable amount of delay for voice connections, per leg, is 60ms. Anything greater than this could cause echo problems making answers A, C, and D incorrect. |
| Question 2 | ______ is the amount of time it takes to encapsulate a packet in a frame and put the bits on a wire. A. Packetization B. Serialization C. Propagation D. Processing
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| A2: | Answer B is correct. Serialization is the amount of time it takes to encapsulate a packet in a frame and put the bits of a frame on a wire. Answer A is incorrect because packetization is the amount of time it takes to segment information, sample and encode any signals, process the traffic, and then encapsulate the data in packets. Propagation is the amount of time it takes to transmit the bits of a frame across a wire to the next networking device, making C incorrect. Processing is the amount of time it takes a networking device to process a received frame, including queuing, making answer D incorrect. |
| Question 3 | Which QoS architecture guarantees QoS parameters on a connection-by-connection basis? A. FIFO B. DiffServ C. IntServ D. LLQ
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| A3: | Answer C is correct. IntServ reserves resources via RSVP to provide a connection-guaranteed QoS. FIFO provides no QoS, making A incorrect. DiffServ provides QoS on a hop-by-hop basis, making B incorrect. LLQ is a queuing method, not a QoS architecture, making D incorrect. |
| Question 4 | Which marking option is used to denote QoS information in an IEEE frame? A. 802.1P B. 802.3P C. 802.1D D. 802.1W
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| A4: | Answer A is correct. 802.1P provides for marking of QoS information in IEEE frames. 802.3P is a nonexistent standard, making B incorrect. 802.1D defines STP, making C incorrect and 802.1W defines RSTP, making D incorrect. |
| Question 5 | What command specifies which traffic goes into which queue with priority queuing? A. queue-list B. priority-queue C. fair-queue D. priority-list
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| A5: | Answer D is correct. The priority-list command is used to define queuing policies for PQ. Answer A is used for CQ, making it incorrect. Answer B is a nonexistent command. Answer C is used for WFQ, making it incorrect. |
| Question 6 | What is the default queuing method used on serial interfaces clocked at E1 speeds or less? |
| A6: | Answer C is correct. WFQ is the default IOS queuing method on serial E1 interface speeds or less. Answer A is true of Cisco's Layer 3 switches, making it incorrect. Answers B and D require manual configuration, making them incorrect. |
| Question 7 | Which QoS tool can be used to avoid congestion? A. WRED B. LLQ C. WFQ D. WRRQ
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| A7: | Answer A is correct. WRED is a congestion-avoidance QoS technique. Answers B, C, and D are used for queuing, which doesn't avoid congestion, but prioritizes traffic. |
| Question 8 | Marking of traffic should occur where? |
| A8: | Answer A is correct. Marking should occur as close to the source as possible, which is the access layer. Therefore, answers B, C, and D are incorrect. |
| Question 9 | Which command specifies your traffic policing policies for QoS? A. class-map B. policy-map C. match D. service-policy
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| A9: | Answer B is correct. The policy-map command specifies your policing policies for classes of traffic. The class-map command is used to classify traffic, not assign policies, making answer A incorrect. The match command is used within the class-map command to match on classes of traffic; therefore, answer C is incorrect. The service-policy command is used to activate your QoS policies, making answer D incorrect. |
| Question 10 | QoS, by default, is enabled on Cisco's Layer 3 switches. |
| A10: | Answer B is correct. You must use the mls qos command to enable QoS on Cisco Layer 3 switches answer A is therefore incorrect. |
