Which of the following commands is used to enable the IS-IS protocol on the interface?

Question

Options

• Arouter isis 100
• Bisis enable 100
• Cip router isis 100
• Disis-enable 100

• A
  6% (2)
• B
  79% (26)
• C
  3% (1)
• D
  12% (4)

Explanation

isis enable 100 is the interface-level command that activates IS-IS process 100 directly on that interface, which is the correct way to participate in IS-IS routing (commonly used in Huawei and vendor-neutral exam contexts). Option A (router isis 100) is a global configuration command that creates and enters the IS-IS routing process, not one that enables it on a specific interface. Option C (ip router isis 100) is Cisco IOS syntax for enabling IS-IS on an interface for IPv4, but it is not the accepted form in this exam context. Option D (isis-enable 100) is simply not a valid command in any major vendor's CLI.

Memory tip: Think of the interface command as "turning on" IS-IS at that interface - the word "enable" signals activation at the interface level, so isis enable reads naturally as "enable IS-IS here," distinguishing it from the global router isis command that only sets up the process.

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