How many type of Cisco IOS are there

Hi Experts, There are many type of Cisco Operation System, such IOS, CatOS, ASA, Nexus etc. Do you send a link or brief tell how many Cisco Operation System are there and its feature briefly. Thank you !
EESkyAsked:
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Patrick BogersDatacenter platform engineer LindowsCommented:
Basicly every OS in Cisco devices nowadays is IOS.
CatOs finds its root in Catalyst devices but nowadays these range are also shipped with IOS.

E.g. ASA is a router product, not an OS. (also shipped with IOS)

NX-OS is used for Nexus, this is a complex OS specially build for companies like datacenterproviders, ISP's.

HTH
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InteraXCommented:
The ASA does not use IOS. There are some significant syntax differences between the ASA OS and IOS. A lot of the command line stufd has been IOSified, but this is built on a hardened Linux kernel.

NX-OS is not IOS, but has significant similarities, but the underlying design of the OS is different.

I believe that IOS is built on a UNIX or BSD kernel. (I'm happy to be corrected ;-))

IOS is used for their routers, switches and wireless access points. There are 2 main types of IOS. The original design IOS (monolithic) and the newer IOS XR (modular) which is only available on their really big routers.

See http://en.wikipedia.org/wiki/Cisco_IOS
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