300-320 · Question #37
What is the recommended subnet between two sites that have a point-to-point connection to conserve IP addresses?
The correct answer is C. 255.255.255.252. A /30 subnet (255.255.255.252) provides exactly 2 usable host addresses - one for each end of a point-to-point link. This is the most efficient choice because point-to-point WAN links only need two IP addresses. A /24 (255.255.255.0) wastes 253 addresses, /22 (255.255.252.0)…
Question
What is the recommended subnet between two sites that have a point-to-point connection to conserve IP addresses?
Options
- A255.255.255.0
- B255.255.252.0
- C255.255.255.252
- D255.255.255.240
How the community answered
(41 responses)- A7% (3)
- B2% (1)
- C88% (36)
- D2% (1)
Explanation
A /30 subnet (255.255.255.252) provides exactly 2 usable host addresses - one for each end of a point-to-point link. This is the most efficient choice because point-to-point WAN links only need two IP addresses. A /24 (255.255.255.0) wastes 253 addresses, /22 (255.255.252.0) wastes over 1,000, and /28 (255.255.255.240) provides 14 usable hosts - all far more than needed for a simple two-router link.
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