ccna 200-125

ccna 200-125.IOS images for each model, series, and each software version/releaseFrom the 1980s through the first decade of this century, Cisco created separate IOS images for each specific router model, version and release, and feature set.First, due to hardware differences, Cisco required different IOS images for each different router model, or at least each different router family. Lower-end routers with limited physical interfaces require different software to support their interfaces than higher-end routers that support many different types of interface cards. In addition, different router models often use different processors, so Cisco needs to compile different IOS images for use with different processors.Second, each new version and release of Cisco's IOS software requires a different IOS image. Cisco uses the term "version" to identify major revisions to the IOS software, and smaller IOS changes are referred to as a "release". However, Cisco does not use this approach when installing IOS as one file on a device and then adding a bug fix as another file. Instead, if a vulnerability fix needs to be added, ported to a new release, or a new version, a brand new IOS file must be obtained from Cisco and then this file installed on the router. While this process is not necessarily difficult (as you learned in Chapter 20), it still incurs administrative overhead because it requires careful planning.Figure 21-1 is a conceptual view of how Cisco prepares many IOS images on a per-router basis. Each router model or model family has a different IOS image, and within the same model family, each software version has a different IOS file. For example, the Cisco 2800 series has one set of IOS images for the 2801 router, and several other sets for the other three routers in the series. For the 2801, for each new release, Cisco creates a completely new IOS file that is posted at Cisco, com for download.Do I already know this? Answers to the quiz: (1) d (2) a (3) c (4) b (5) d (6) a11.2 Basic Content 4272801 Version X Release 1 Version X Release 2 Version X Release 3IOS image IOS image I0S imageVersion X Version X