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Compression tools reduce the amount of bandwidth needed to send all packets, but the compression process adds some delay per packet and also consumes CPU cycles. ” A router can reduce jitter for some traffic, but that usually increases delay and jitter for other traffic flows. QoS features can address jitter problems, particularly the queuing features that have priority queuing for packets that need low jitter. Packet loss can occur because of transmission errors, and QoS mechanisms cannot do much about that.

So how much delay should a packet experience in the cloud? Well, it will vary. The carrier might commit to a maximum delay value as well. However, with a little insight, you can get a solid understanding of the minimum delay a packet should experience through a Frame Relay cloud. Consider Figure 1-11, focusing on the Frame Relay components. book Page 23 Tuesday, October 19, 2004 1:40 PM QoS: Tuning Bandwidth, Delay, Jitter, and Loss Figure 1-11 23 Frame Relay Network: Propagation and Serialization Delay Components Server 1 Propagation Delay - Educated Guess Based on Distance from R2 to R3 IP IP Hannah FA0/0 SW1 R1 s0 s0 R2 T1 s0/0 s1 R3 SW2 Serialization Delay 201 301 The propagation delay and serialization delay can be guessed pretty closely.

The bandwidth command is required before a queuing tool knows how much bandwidth is available. ” Quiz 4. 5. d. Defaults to T1 speed, unless the clock rate command has been configured. e. Defaults to T1 speed, unless the bandwidth command has been configured. 5 Which of the following components of delay varies based on the varying sizes of packets sent through the network? a. Propagation delay b. Serialization delay c. Codec delay d. Queuing delay Which of the following is the most likely reason for packet loss in a typical network?

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