By Joe Habraken
ISBN-10: 0789722933
ISBN-13: 9780789722935
The description of CCNA Cheat Sheet maps on to the Cisco requisites for the routing and switching CCNA examination. This booklet presents pattern questions that attempt your wisdom of the CCNA examination goals utilizing a query structure just like that used at the genuine examination. This booklet offers questions and solutions that simulate the particular test--considered a need through the community pros who are looking to "cram" for a try that would be an enormous milestone of their occupation.
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Extra resources for CCNA 2.0 640-507 Routing and Switching Cheat Sheet
Example text
This chapter also covers one objective, Telnet, from the Network Management Category. • IOS CLI Router • Telnet OBJECTIVE 10 IOS CLI Router—Basic Commands The Cisco Internetworking Operating System (IOS) is the software that provides the router hardware with the capability to route packets on an internetwork. The IOS (just like any other operating system) provides the command sets and software functionality you use to monitor and configure the router, and it also provides the functionality for the various protocols—both routed and routing—that make internetworking a reality.
Application B. Presentation C. Data Link D. Network Answer A is incorrect; the Application layer handles program-to-program communication. Answer B is incorrect; the Presentation layer handles data conversion and encryption. Answer C is incorrect; the Data Link layer handles framing and node-to-node transport. Answer D is correct; the Network layer is responsible for routing on an internetwork. This is the layer where routers operate. 18 Cheat Sheet The OSI Model (from the top down): • • • • • • • Application Presentation Session Transport Network Data Link Physical The Application layer provides network services related to user applications, such as message handling, file transfer, and database queries.
Examining RAM, NVRAM, and Flash RAM Several items reside in the router’s RAM (while the router is powered on), including the router’s active IOS, the running configuration, the routing table, and other cache and buffers (such as the History buffer). You can view these items using various permutations of the show command. For example, to view the router’s running configuration, you would use the show running-config command at the privileged prompt (see the following two figures—the results of the command are selectively shown).