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Congestion management attempts to alleviate some of the problems that occur when your link becomes saturated Packet queues are created and used to store the packets until there is available bandwidth to send the transmission There are several queuing methods, each offering different ways to control which packets get queued up and when they are transmitted FIRST IN FIRST OUT (FIFO) This is the default method used on most routers The first packet in is the first to go out FIFO offers no prioritization and no QoS WEIGHTED FAIR QUEUING (WFQ) Up to 256 individual queues are created, all with equal opportunity to transmit Queues can be created based on source or destination address, protocol, source and destination ports, Frame Relay DLCI values, or even IP Precedence bits WFQ works by giving preferential treatment to low-volume flows, and then uses a congestion management algorithm to parcel out the remaining bandwidth to high-volume flows Two output queues are set up, one each for low-volume and high-volume flows; the threshold separating them is a configurable parameter WFQ is an automatic way to stop "bandwidth hogs" from starving off normal flows, allowing stabilization of network operations (and great reduction in the number of teed-off users) Most WFQ algorithms operate using the IP Precedence bits CUSTOM QUEUING (CQ) In CQ, as in WFQ, individual queues (up to 16) can be created for outgoing traffic However, in CQ each queue can be assigned a specific portion (in bytes) of the available bandwidth This allows guarantee of some level of service to all users because even the lowest priority data gets its own queue PRIORITY QUEUING (PQ) In PQ, up to four queues can be created for your data You can set it up so that other queues do not get service unless a more important queue is empty This allows absolute best service for some traffic but will snuff out lower-priority traffic altogether.

1 C Cable testers can show that you have a broken or miswired cable 2 A Tone probes are only used for locating individual cables 3 B NSLOOKUP queries the DNS and returns the IP address of the supplied host name 4 D All of the above; Wireshark can sniff and analyze all the network traffic that enters the computer s NIC 5 D Route print returns the local system s routing table 6 A With novice or confused users, it is best to ask open-ended questions to allow the user to explain the problems in their own words 7 A Ask yourself if anything could have happened from your side of the network 8 B Although it s not fun, you should always test your fix after you have implemented it 9 C Documenting the solution is the last and in many ways most important part of the troubleshooting model 10 D In this case the DNS system is probably at fault By PINGing the site with its IP address you have established that the site is up and your LAN and gateway are functioning properly

Combining this with Eqs (35) and (36) we are able to write down the derivative of any polynomial Later, we ll see an important by-product of this result If we expand some complex function in a series: f ( z ) = an z n

Since weighted fair queuing is the simplest queuing method to set up, we'll use it for our example If you do configure WFQ and then decide to switch to another queuing method, the new configuration will override WFQ Setting up congestion management is quite easy because it's already running by default on many interfaces WFQ is automatically turned on for all serial links that run at or below 2 Mbps Otherwise, you can turn it on by going first to the interface and then issuing this command: Router(config-if)#fair-queue 64 128 16 The first argument (64) identifies the number of messages to hold in the queue; the second (128) sets the total number of dynamic queues to use; the last argument tells the router to create 16 queues for RSVP conversations

The CompTIA Network+ certification exam expects you to know how to 17 Compare the characteristics of wireless communication standards 25 Categorize WAN technology types and properties 31 Install, configure, and differentiate between common network devices 34 Implement a basic wireless network 47 Given a scenario, troubleshoot common connectivity issues and select an appropriate solution 63 Explain the methods of network access security To achieve these goals, you must be able to Explain wireless networking standards Describe the process for implementing Wi-Fi networks Describe troubleshooting techniques for wireless networks