CCENT Exam Cram. Exam 640-822 by Michael Valentine

By Michael Valentine

In this booklet, you learn the way to:

  • Develop ideal fluency in subnetting
  • Understand the OSI version and the Cisco three-layer hierarchical model
  • Connect Cisco apparatus, make preliminary configurations, and attach to different units to construct a network
  • Configure Cisco routers and again up and fix your Cisco IOS software program configurations
  • Implement, be certain, and troubleshoot a small, switched network
  • Configure and ascertain a simple WAN serial connection
  • Understand and observe instant LAN (WLAN) concepts
  • Mitigate community safety threats and safe community devices
  • Configure static routes and RIPv2
  • Connect a small place of work to the Internet


WRITTEN by way of CCNA/CCENT Experts!


Michael Valentine has been within the IT box for 12 years, targeting community layout and implementation. he's presently a Cisco coach with Skyline complicated know-how providers and focuses on Cisco Unified Communications guide in addition to CCNA and CCNP courses.


Andrew Whitaker is the director of company InfoSec and networking and senior education teacher for education Camp. He has completed a number of Cisco certifications and has written on a number of Cisco topics.


This e-book features a CD-ROM that features:

  • Complete insurance of CCENT examination objectives
  • Realistic examination questions for potent practice
  • Detailed reasons of right and unsuitable answers
  • Multiple examination modes
  • Flash Card format
  • An digital replica of the book

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Additional info for CCENT Exam Cram. Exam 640-822

Sample text

Ethernet, if using a hub or a switch and Twisted Pair cabling, is star-wired. ➤ Ring—A ring topology is created when one device is connected to the next one sequentially, with the last device being connected to the first. The actual devices don’t necessarily form a circle, but the data moves in a logical circle. FDDI and Token Ring are examples of ring topologies. 19 LAN Technologies ➤ Bus—A bus topology uses a single coaxial cable, to which hosts are attached at intervals. The term bus comes from an electrical bus, which is a point from which electrical power can be drawn for multiple connections.

I don’t know if Dave Minutella made that one up, but I’ll give him the credit because he taught it to me… Let’s examine what happens at each layer as we send data to another computer. Layer 7: The Application Layer If you are using any program or utility that can store, send, or retrieve data over a network, it is a Layer 7 application. Layer 7 is sometimes called the user interface layer; for example, when you launch a web browser and type in an address, you are working with a network-aware application and instructing it what to do on the network—that is, go and retrieve this web page.

With UDP, there is no PAR. You ask for something, and then you get it. If it doesn’t work, you have to ask all over again. Most applications, such as a TFTP server for example, will handle any errors and retransmissions—which means that the application itself (up at Layer 7) is doing the reliability, not Layer 4. ” UDP is good when reliability is not needed—for DNS lookups or TFTP transfers, for example—or when the overhead of TCP would cause more problems than it solves—for example, when doing VoIP.

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