Introducing Cisco Data Center Networking (DCICN) — Question 51

Which three statements are true concerning RFC 1918 IP addresses? (Choose three.)

Answer options

• A. They are globally routable.
• B. They are not globally routable.
• C. They must not be filtered at Internet border interfaces.
• D. They should be filtered at Internet border interfaces.
• E. They include 10.0.0.0/8, 172.16.0.0/16, and 192.168.1.0/24.
• F. They include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

Correct answer: B, D, F

Explanation

The correct answer includes B, D, and F because RFC 1918 addresses are private and not routable on the global Internet, so they should be filtered at border interfaces to prevent routing issues. Options A and C are incorrect as they state that these addresses can be routed globally and should not be filtered, which contradicts the nature of RFC 1918 addresses. Option E is also incorrect as it lists the wrong subnet for the 192.168 address space.