Download e-book for kindle: Cisco DQOS exam certification guide: IP telephony self-study by Wendell Odom

By Wendell Odom

Organize of the IP Telephony centred Certifications with the respectable DQOS/QOS try out guidance advisor. * grasp over 20 caliber of carrier (QoS) positive aspects, together with either MQC-enabled and non-MQC good points * QoS characteristic comparisons exhibit alterations, advantages and similarities, supporting the reader establish the optimum QoS array for his or her community * Use as a connection with QoS applied sciences, and get ready for the DQOS examination with the one Cisco approved examination education bookQuality of provider (QoS) is a necessary aspect to development a versatile, obtainable, and effective community. Its position in a number of applied sciences underlines the necessity for many networking pros to grasp the positive aspects that enforce QoS. QoS, and particularly the QoS good points that an IT expert implements on varied applied sciences, is helping prioritize and advisor site visitors flows in a fashion that maximizes the buyer event. This prioritization is only one component of QoS, and diverse gains can be utilized to figure out this circulate. As extra complicated applied sciences like Voice over IP are applied on networks, QoS becomes extra very important. this can be very true while those applied sciences raise the variety of these gaining access to and utilizing the community.

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If the link is fast, the bits can be encoded onto the link more quickly; if the link is slow, it takes longer to encode the bits on the link. Likewise, if the packet is short, it does not take as long to put the bits on the link as compared with a long packet. Use the following formula to calculate serialization delay for a packet: #bits sent -------------------------Link speed Suppose, for instance, that Hannah send a 125-byte packet to Server1. Hannah sends the packet over the Fast Ethernet to the switch.

Book Page 23 Wednesday, July 16, 2003 4:06 PM QoS: Tuning Bandwidth, Delay, Jitter, and Loss 23 Suppose, for example, that R2 and R3 are 1000 km apart, and a 1500-byte packet is sent. 6 ms delay Of course, the delay will vary—and will depend on the provider, the status of the network’s links, and overall network congestion. In some cases, the provider will include delay limits in the contracted service-level agreement (SLA). Queuing delay inside the cloud creates the most variability in network delay, just as it does outside the cloud.

Table 1-4 lists the serialization delay for a couple of frame sizes and link speeds. 85 214 Propagation Delay Imagine you are watching a train again, this time from a helicopter high in the air over the tracks. You see the train leaving one station, and then arriving at the second station. Using a stopwatch, you measure the amount of time it takes from the first car leaving the first station until the first car arrives at the second station. Of course, all the other cars take the same amount of time to get there as well.

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