READ Free Dumps For Cisco- 400-051
| Question ID 13062 | Assume 20 bytes of voice payload, 6 bytes for the Layer 2 header, 1 byte for the end-of-
frame flag, and the IP, UDP, and RTP headers are compressed to 2 bytes, how much
bandwidth should be allocated to the strict priority queue for six VoIP calls that use a G.729
codec over a multilink PPP link with cRTP enabled?
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| Option A | 80.4 kb/s
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| Option B | 91.2 kb/s
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| Option C | 78.4 kb/s
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| Option D | 69.6 kb/s
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| Option E | 62.4 kb/s
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| Correct Answer | D |
Explanation Explanation: Voice payloads are encapsulated by RTP, then by UDP, then by IP. A Layer 2 header of the correct format is applied; the type obviously depends on the link technology in use by each router interface: A single voice call generates two one-way RTP/UDP/IP packet streams. UDP provides multiplexing and checksum capability; RTP provides payload identification, timestamps, and sequence numbering.
| Question ID 13063 | In Cisco IOS routers that use low latency queuing, which algorithm is used to presort traffic
going into the default queue?
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| Option A | first-in, first-out
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| Option B | last-in, first-out
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| Option C | weighted round robin
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| Option D | fair queuing
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| Option E | random processing
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| Correct Answer | D |
Explanation Explanation: WFQ is a flow-based queuing algorithm used in Quality of Service (QoS) that does two things simultaneously: It schedules interactive traffic to the front of the queue to reduce response time, and it fairly shares the remaining bandwidth between high bandwidth flows. A stream of packets within a single session of a single application is known as flow or conversation. WFQ is a flow-based method that sends packets over the network and ensures packet transmission efficiency which is critical to the interactive traffic. This method automatically stabilizes network congestion between individual packet transmission flows.