Download Cisco DQOS exam certification guide: IP telephony self-study by Wendell Odom PDF

By Wendell Odom

Arrange of the IP Telephony centred Certifications with the professional DQOS/QOS try practise advisor. * grasp over 20 caliber of carrier (QoS) positive aspects, together with either MQC-enabled and non-MQC beneficial properties * QoS function comparisons convey changes, advantages and similarities, assisting 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 guidance bookQuality of carrier (QoS) is a necessary point to construction a versatile, available, and effective community. Its position in a number of applied sciences underlines the necessity for many networking pros to grasp the beneficial properties that enforce QoS. QoS, and in particular the QoS positive aspects that an IT expert implements on diversified applied sciences, is helping prioritize and consultant site visitors flows in a way that maximizes the buyer adventure. This prioritization is only one component to QoS, and various gains can be utilized to figure out this circulate. As extra advanced applied sciences like Voice over IP are carried out on networks, QoS turns into extra very important. this is often very true while those applied sciences raise the variety of these gaining access to and utilizing the community.

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Sample text

Of course, all the other cars take the same amount of time to get there as well. This delay is similar to propagation delay in networking. Propagation delay defines the time it takes a single bit to get from one end of the link to the other. When an electrical or optical signal is placed onto the cable, the energy does not propagate to the other end of the cable instantaneously—some delay occurs. The speed of energy on electrical and optical interfaces approaches the speed of light, and the network engineer cannot override the laws of physics!

Because it does affect delay, however, it is included here. book Page 22 Wednesday, July 16, 2003 4:06 PM 22 Chapter 1: QoS Overview Network Delay Most people draw a big cloud for a Frame Relay or ATM network, because the details are not typically divulged to the customer. However, the same types of delay components seen outside the cloud also exist inside the cloud—and the engineer that owns the routers and switches outside the cloud cannot exercise as much QoS control over the behavior of the devices in the cloud.

Based on the speed of light over that medium, and the length of the link. Every physical link. Typically negligible on LAN links and shorter WAN links. book Page 24 Wednesday, July 16, 2003 4:06 PM 24 Chapter 1: QoS Overview Table 1-6 Components of Delay Not Specific to One Type of Traffic (Continued) Delay Component Definition Where It Occurs Queuing delay (variable) Time spent in a queue awaiting the opportunity to be forwarded (output queuing), or awaiting a chance to cross the switch fabric (input queuing).

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