Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 94

Which two statements about GRE tunnel keys are true? (Choose two.)

Answer options

• A. The key ID must be the same on each device.
• B. They prevent the injection of unwanted frames.
• C. They prevent the injection of unwanted packets.
• D. They must be stored to a keychain.
• E. They provide the highe level of security that is available. AC

Correct answer:

Explanation

The correct answers are A and C. Option A is correct because GRE tunnel keys must match on both ends of the tunnel for proper communication. Option C is also correct as GRE tunnel keys are used to prevent the injection of unwanted packets. Options B, D, and E are incorrect because GRE keys do not specifically prevent unwanted frames or provide the highest security level, nor do they need to be stored to a keychain.