Almost all advanced Cisco routers and switches are equipped with the Cisco proprietary operating systems called the IOS, depending on the version of IOS installed in your Cisco product there is an additional component called the Management Information Base (MIB) integrated into the IOS operating system. The reason why we are discussing the MIB is because, if you have a Cisco product with an IOS version greater than 11.1, chances are you have the MIB module will be available to you, and you can easily acquire accurate memory information on the product. This of course is very useful if you plan to upgrade the memory of your product. Note: that only Cisco Pix firewalls do not come equipped with the IOS operating system.

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