What is a difference between the Cisco IOS 12 and IOS 15 versions?

Last Updated: Jan 2, 2025
IT Exam Items Repository › Category: CCNA › What is a difference between the Cisco IOS 12 and IOS 15 versions?

What is a difference between the Cisco IOS 12 and IOS 15 versions?

  • The IOS 12 version has commands that are not available in the 15 version.
  • The IOS version 15 license key is unique to each device, whereas the IOS version 12 license key is not device specific.
  • Every Cisco ISR G2 platform router includes a universal image in the IOS 12 versions, but not the IOS 15 versions.
  • IOS version 12.4(20)T1 is a mainline release, whereas IOS version 15.1(1)T1 is a new feature release.

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