By Todd Lammle
Concise, obtainable assurance of All CCNA targets for examination 640-801 Bonus assessments at the CD Written through Todd Lammle, the best Authority on Cisco Internetworking From the writer of Sybex's best-selling CCNA: Cisco qualified community affiliate research consultant comes the streamlined software you want to hone in on severe CCNA details: CCNA speedy move. The enclosed CD permits you to perform, perform, perform so that you can method the examination with self belief. insurance contains: Designing Cisco internetworks constructing an entry checklist comparing TCP/IP communique Configuring routers and switches Configuring IP addresses, subnet mask, and gateway addresses acting LAN, VLAN, and WAN troubleshooting realizing ideas for packet regulate Featured at the CD The enclosed CD gains CCNA perform checks overlaying all examination targets. you furthermore may get a hundred digital flashcards for desktops, Pocket desktops, and Palm handhelds, plus a thesaurus of keyword phrases. word: CD-ROM/DVD and different supplementary fabrics aren't incorporated as a part of publication dossier.
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Extra resources for CCNA: Cisco Certified Network Associate FastPass, 2nd Edition
To complicate matters further, the network address of all zeros (0000 0000) is reserved to designate the default route. In addition, the address 127, which is reserved for diagnostics, can’t be used either, which means that you can really use only the numbers 1 to 126 to designate Class A network addresses. This means that the actual number of usable Class A network addresses is 128 minus 2, or 126. Each Class A address has three bytes (24-bit positions) for the node address of a machine. This means there are 224—or 16,777,216—unique combinations and, therefore, precisely that many possible unique node addresses for each Class A network.
To understand how a VLAN works within a switch, begin by looking at a traditional network. 14 shows how a network can be created by connecting physical LANs to routers using hubs. Here you can see that each network is attached with a hub port to the router (each segment also has its own logical network number, although this is not obvious from the figure). Each node attached to a particular physical network has to match that network number in order to be able to communicate on the internetwork.
If a new update arrives from a neighbor with a better metric than the original network entry, the holddown is removed and data is passed. But if an update is received from a neighbor router before the holddown timer expires and it has an equal or lower metric than the previous route, the update is ignored and the holddown timer keeps ticking. This allows more time for the network to stabilize before it tries to converge. Holddowns use triggered updates that reset the holddown timer to alert the neighbor routers of a change in the network.
CCNA: Cisco Certified Network Associate FastPass, 2nd Edition by Todd Lammle