Cisco Ccna Exam Tutorial A Guide To Ram Rom Nvram And Flash

Cisco CCNA Exam Tutorial: a​ Guide To RAM, ROM, NVRAM, and Flash
CCNA exam success depends on knowing the details, and nowhere is​ this more true than knowing the various components of​ a​ Cisco router .​
This is​ also where you can quickly start drowning in​ acronyms! The terms RAM and ROM probably aren't new to​ you, but keeping up with what goes where with RAM, ROM, NVRAM, and Flash Memory can be quite a​ challenge! In this tutorial, we'll take a​ look at​ all four of​ these components and their contents.
ROM stands for Read-Only Memory .​
ROM stores the router’s bootstrap startup program, operating system software, and power-on diagnostic test programs (the POST).
Flash memory is​ generally referred to​ as​ flash The Cisco Internetwork Operating System (IOS) images are held here .​
Flash is​ erasable and reprogrammable ROM .​
Flash memory content is​ retained by the router on power-down or​ reload.
RAM is​ short for Random-Access Memory .​
RAM on a​ Cisco router stores operational information such as​ routing tables and the running configuration file .​
RAM contents are lost when the router is​ powered down or​ reloaded.
NVRAM is​ non-volatile RAM .​
By non-volatile, we mean that the contents of​ NVRAM are not lost when the router is​ powered down or​ reloaded .​
Where RAM holds the running configuration file, NVRAM holds the startup configuration file .​
If NVRAM is​ empty when the router reloads, you will be prompted to​ enter setup mode.
Success on the CCNA exam depends on keeping these terms straight and knowing their contents .​
Know the contents of​ each, pay special attention to​ what is​ lost on a​ reload and what is​ not, and you're on your way to​ CCNA exam success!

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