Download Cisco Routers for the Desperate: Router and Switch by Michael W. Lucas PDF

By Michael W. Lucas

Cisco routers and switches are the cornerstones of many networks. but if issues holiday, maintenance can intimidate even the main powerfuble administrator. fortunately, simply realizing the "in case of emergency" fundamentals will take you far.

Just just like the unique, this moment version of the hugely acclaimed Cisco Routers for the Desperate is written for the administrator in problem mode. up to date to hide switches and the newest Cisco terminology, with a tighter specialise in the desires of the small community administrator, this moment variation offers what you want to recognize to supply trustworthy community providers and fasten difficulties quickly. You'll locate assurance of:
* Installation—how to get your router and community connections up and operating correct the 1st time
* Troubleshooting routers and switches, for you to ascertain no matter if your or the net is broken
* safety issues, like the way to preserve your community gear secure from hackers and set up a personal community among offices
* the right way to enforce easy community redundancy to lessen the danger of community downtime

Cisco Routers for the determined, 2d Edition is designed to be learn as soon as and left on my own till whatever breaks. while it does, you'll have every little thing you want to understand in a single easy-to-follow guidebook.

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Extra info for Cisco Routers for the Desperate: Router and Switch Management, the Easy Way

Example text

After the total processors for workers reached at a certain point, the asynchronous versions were faster than the synchronous one. In our experiments, the number of processors was 15. Fig. 7 (b) shows, the iteration numbers for asynchronous version has irregular because of asynchronous algorithm. Fig. 8 shows that asynchronous versions are faster than the synchronous counterparts for communication time. In synchronous version, workers become idle until the process of a master is completed and they get the data needed for their next iteration.

Fig. 3 shows operations in the PARMI system. If we have a set of processes, Π= {p1… pn} that communicate by exchanging information items, then each process pi executes three operations: publishi(v,t),registeri(Si,t),and unregisteri(Si,t), where v is a value of an information item, t is a topic for publish and subscribe, and S is a subscriber itself. Each process pi can be either a publisher or a subscriber. If pi is a publisher, then it sends the data to the adapter when it is ready. When publishi(v, t) method is invoked by process pi, the adapter checks its Hashtable €€ whether it contains the item with the key t.

We ran the tests ten times and averaged the results. In Fig. 4(a), we measure write performance with various file sizes and various number of I/O nodes. The striping size is 64 KB. The size of the memory buffer used equals to the number of I/O nodes multiplied by the striping size. Write performance converges to about 53 MB/s when only one I/O node is used. We consider that the write performance is bounded by the local file system in this case, since this is almost equal to the local file system write performance as 14 L.

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