By Wendell Odom
The legitimate self-study attempt education advisor for the Cisco DQOS 9E0-601 and QOS 642-641 examsThis reputable examine advisor is helping you grasp all of the issues at the DQOS examination, including:QoS recommendations, instruments, and architecturesClassification and staining strategies and toolsQueuing in Cisco routers and configuration of queuing toolsTraffic policing and shaping in Cisco routersConfiguration of congestion avoidance toolsConfiguration of link-efficiency toolsCall admission regulate (CAC) instruments for voice and video connectionsCisco QoS administration toolsQoS layout processesQoS on LAN switchesThe Cisco IP Telephony aid, layout, and Operations professional centred certifications validate talent in designing, fitting, and aiding a multiservice community answer. an effective knowing of quality-of-service (QoS) gains and implementation is vital for all the Cisco IP Telephony centred certifications and can be a center portion of the CCIP(tm) certification.
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Extra resources for Cisco DQOS Exam Certification Guide
Figure 1-4, for example, shows a twoqueue system. The first queue gets 25 percent of the bandwidth on the link, and the second queue gets 75 percent of the bandwidth. Figure 1-4 Bandwidth Reservation Using Queuing R1 Output Queue 1 25% Bandwidth 3 2 1 4 X 1500 Byte Packets Output Queue 2 4 R2 75% Bandwidth With regard to Cisco IOS Software queuing tools that reserve bandwidth, if both queues have packets waiting, the algorithm takes packets such that, over time, each queue gets its configured percentage of the link bandwidth.
Chapter 7, “Link-Efficiency Tools,” covers compression delay. Table 1-6 summarizes the delay components listed in this section. Table 1-6 Components of Delay Not Specific to One Type of Traffic Delay Component Definition Where It Occurs Serialization delay (fixed) Time taken to place all bits of a frame onto the physical medium. Function of frame size and physical link speed. Outbound on every physical interface; typically negligible on T3 and faster links. Propagation delay (fixed) Time taken for a single bit to traverse the physical medium from one end to the other.
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). Possible on every output interface. Input queuing unlikely in routers, more likely in LAN switches.