The structure of the IOS image is typically image that contains the code for all features.
The features that are provided will depend on those authorized by Cisco in the purchased license.
Cisco network engineers should know how to correctly perform a router image update/upgrade.
This article covers the different image types that exist on most Cisco equipment, Cisco’s image-naming structure, and how to perform image updates/upgrades.
This section reviews the most commonly taught methods; it is by no means a complete list of the possibilities.
Some engineers like this and some don’t, but it does add another thing for engineers to be familiar with.
Many methods that can be used to update/upgrade a Cisco image.
On most Cisco platforms, two different images are held within a device.A boot image (also referred to as the xboot, rxboot, bootstrap, or bootloader) and the system image (the complete IOS image).