Voice over IP First-Step

1.

Which of the following results from an uneven arrival of packets?

  1. Packet loss

  2. Tail drop

  3. Jitter

  4. TCP retransmits

2.

As a design recommendation, voice packets should have a maximum one-way delay of

  1. 10 ms

  2. 15 ms

  3. 150 ms

  4. 250 ms

3.

Which of the following Per-Hop Behaviors (PHBs) has the highest drop probability?

  1. AF41

  2. AF12

  3. AF11

  4. AF13

4.

Identify the congestion management QoS mechanism from the following.

  1. LLQ

  2. WRED

  3. LFI

  4. Policing

5.

Which of the following QoS mechanisms begins to discard lower-priority packets as a router's output queue starts to fill to capacity?

  1. LLQ

  2. WRED

  3. LFI

  4. Policing

6.

Which of the following queuing mechanisms offer a priority queue? (Select two.)

  1. WRR

  2. LLQ

  3. FIFO

  4. WFQ

7.

Which of the following QoS mechanisms can either discard or remark packets exceeding a specified bandwidth limit?

  1. LLQ

  2. WRED

  3. LFI

  4. Policing

8.

What is the typical size of a voice packet's header, before compression?

  1. 2 bytes

  2. 4 bytes

  3. 26 bytes

  4. 40 bytes

9.

Select the appropriate Link Fragmentation and Interleaving (LFI) tool for Voice over IP over Frame Relay (VoIPovFR) links.

  1. MLP

  2. FRF.12

  3. FRF.11 Annex C

  4. cRTP

10.

Traffic shaping's timing interval (Tc) can be calculated from which of the following formulas?

  1. Tc = Bc / CIR

  2. Tc = CIR * Bc

  3. Tc = CIR / Bc

  4. Tc = (Bc + CIR) / Bc

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