TAILIEUCHUNG - Cisco Device Operation

This chapter focuses on monitoring and maintaining router networks via IOS commands. In particular, this chapter describes Cisco router’s major hardware components, common show and debug IOS commands, and methods used to configure protocol translation. | 10 Cisco Device Operation Terms you ll need to understand Random access memory RAM Non-volatile random access memory NVRAM Flash Central processing unit CPU Read-only memory ROM Configuration register Exec mode Privilege mode Trivial File Transfer Protocol TFTP Simple Network Management Protocol SNMP Protocol translation Debugging Techniques you ll need to master Issuing infrastructure commands Viewing router configurations Using common IOS commands Configuring protocol translation 1 2 Chapter 10 This chapter focuses on monitoring and maintaining router networks via IOS commands. In particular this chapter describes Cisco router s major hardware components common show and debug IOS commands and methods used to configure protocol translation. This chapter covers the following Cisco device operation CCIE blueprint objectives as laid out by the Cisco Systems CCIE program Operation commands show debug. Infrastructure NVRAM flash memory CPU file system config reg. Operations File transfers password recovery Simple Network Management Protocol SNMP accessing devices password security. As with other chapters in this book additional information is provided for completeness and in preparation for additional subjects as the CCIE program expands. Infrastructure Commands Cisco routers consist of many hardware components. The main components of a Cisco router include RAM NVRAM Flash CPU ROM Configuration registers Interfaces Figure illustrates Cisco routers hardware components. Each hardware component is vital for Cisco routers to operate properly. To help you prepare for the CCIE exam the next few sections present the main concepts you need to know about Cisco hardware components. Let s begin by looking at random access memory RAM . RAM Routers use random access memory RAM to store the current configuration file and other important data collected by the router. This data includes the IP routing table and buffer information. Buffers temporarily store packets before a router

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