A technician is configuring a point-to-point heartbeat connection between two servers using IP addressing. Which of the following is the most efficient subnet mask for this connection?

Question

Options

• A/28
• B/29
• C/30
• D/32

• A
  3% (1)
• B
  13% (4)
• C
  81% (25)
• D
  3% (1)

Explanation

The most efficient subnet mask for a point-to-point heartbeat connection between two servers using IP addressing is /30. A /30 subnet mask has 255.255.255.252 as its decimal representation and 11111111.11111111.11111111.11111100 as its binary representation. This means that there are only two bits available for the host portion of the IP address, which allows for four possible combinations: 00, 01, 10, and 11. However, the first and the last combinations are reserved for the network address and the broadcast address, respectively. Therefore, only two IP addresses are usable for the point-to- point connection, which is the minimum required for such a link. A /30 subnet mask is also known as a point-to-point prefix because it is commonly used for point-to- point links between routers or servers.

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