By D. J. Henry

As a last examination instruction software, the CCNP instant (642-742 IUWVN) quickly Reference offers a concise evaluate of all targets at the new exams.  the quick e-book presents readers with particular, graphical-based details, highlighting merely the most important subject matters in cram-style format.

 

With this record as your advisor, you are going to overview subject matters on options and instructions that follow to this examination. This fact-filled speedy Reference enables you to get all-important details at a look, supporting you concentration your examine on parts of weak point and embellishing your reminiscence retention of crucial examination concepts.

 

The IUWVN imposing Cisco unified instant Voice Networks examination is an examination linked to the CCNP instant certification. CCNP instant certification addresses the necessity for designing, imposing, and working Cisco instant networks and mobility infrastructures. CCNP instant certification emphasizes instant networking rules and thought. It additionally acknowledges the services and technical acumen of instant pros who can investigate and translate community company specifications into technical necessities that during flip, are integrated into winning installations.

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Extra resources for CCNP Wireless (642-742 IUWVN) Quick Reference

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The station wakes up at regular intervals to listen to the AP beacon, which contains a field called the Traffic Indication Map (TIM), indicating the list of stations for which some traffic is buffered. Some beacons also contain a Delivery Traffic Indication Message (DTIM), indicating that the AP has broadcast or multicast traffic that is going to be sent just after the beacon. The station should stay awake to receive the broadcast/multicast frame. If the station sees its number in the TIM, it sends a special frame (PS-Poll) to the AP to ask for the first buffered packet.

The AIFS is 1 SIFS + AIFSN, where AIFSN (the AIFS number) is a number of slot times that depends on the queue to use. AIFSN is 2 for AC_VO and AC_VI, 3 for AC_BE, and 7 for AC_BK. Notice that AIFS is always equal or longer than DIFS (never shorter). The station then counts down from the backoff timer chosen for that queue. When the queue reaches 0, the frame is sent. All queues count down in parallel inside the station. Because AIFS and CW are smaller for higher-priority queues, chances are higher to send more voice packets faster than packets of the other queues.

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