CCNP Wireless (642-742 IUWVN) Quick Reference by D. J. Henry

By D. J. Henry

As a last examination training instrument, the CCNP instant (642-742 IUWVN) fast Reference presents a concise assessment of all pursuits at the new exams.  the quick e-book offers readers with designated, graphical-based details, highlighting in basic terms the most important subject matters in cram-style format.


With this record as your advisor, you are going to evaluation themes on options and instructions that practice to this examination. This fact-filled fast Reference enables you to get all-important info at a look, supporting you concentration your learn on components of weak spot and embellishing your reminiscence retention of crucial examination concepts.


The IUWVN enforcing Cisco unified instant Voice Networks examination is an examination linked to the CCNP instant certification. CCNP instant certification addresses the necessity for designing, enforcing, and working Cisco instant networks and mobility infrastructures. CCNP instant certification emphasizes instant networking rules and concept. It additionally acknowledges the services and technical acumen of instant execs who can check and translate community enterprise necessities into technical necessities that during flip, are included into profitable installations.

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The DSCP value itself is usually represented in decimal. For example, DSCP 011010 is converted to decimal and usually written as DSCP 26. The initial 011 distinguishes that it is in the AF class. To better read the difference between the class and the drop probability, DSCP tags are also often written using the per-hop behavior (PHB) convention, writing the class (AF in this example), then the class translated into decimal (011 = 3), and then the DP value (01 = 1), ignoring the last bit (which is always set to 0 anyway).

Therefore, whenever you trust CoS or DSCP, you should verify the CoS-to-DSCP map and the DSCP-to-CoS map with the show mls qos maps [cos-dscp Ĥ dscp-cos] command. If the default values do not match your requirements (for example, CoS 5 is often mapped by default to DSCP 40 instead of the recommended DSCP 46 for voice traffic), you can change the mapping. To change the DSCP value you want for a trusted CoS value, use the command mls-qos cos-dscp map. For this command, you provide eight DSCP values, to match the eight trusted CoS values (from 0 to 7).

Beyond their policing or shaping aspect, each congestion management method prioritizes packets in a specific way: 舦 Priority queuing (PQ) guarantees strict service of a queue (servicing this queue in priority, regardless of the number of packets in the other queues), which is good for the prioritized queue but may starve the other queues. 舦 Custom queuing (CQ) allocates a percentage of the bandwidth to each queue, ensuring good load balancing to each queue, but no real prioritization. 舦 Weighted fair queuing (WFQ) sends in priority smaller packets (low-bandwidth consumption) and packets with a higher ToS value, using an automatic classification algorithm.

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