ICND2: Interconnecting Cisco Networking Devices Part 2 (legacy) — Question 135

Which three components must you configure to establish a GRE tunnel? (Choose three.)

Answer options

• A. BGP autonomous system number
• B. authentication mode
• C. tunnel destination IP address
• D. IGP type at each site
• E. tunnel source IP address
• F. logical tunnel interface CEF

Correct answer:

Explanation

To establish a GRE tunnel, you must configure the tunnel source IP address, tunnel destination IP address, and the logical tunnel interface. The BGP autonomous system number, authentication mode, and IGP type are not required for the basic function of a GRE tunnel, making them incorrect choices.