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Difficulty: EasyIPv4 Addressing and Subnetting

A network technician is provisioning an isolated subnet for a small cluster of administrative servers using the /29/29 IPv4 prefix. What is the maximum number of usable host IP addresses available on this subnet?

  1. 6Answer
  2. B
    8
  3. C
    14
  4. D
    4

Answer

The maximum number of usable host IP addresses available on a /29/29 subnet is 6.
For a /29/29 prefix, 32−29=332 - 29 = 3 bits remain for host addressing. The total number of IP addresses in the block is 23=82^3 = 8. Because 1 address is reserved for the network ID and 1 address is reserved for the directed broadcast ID, the number of usable host IP addresses is 8−2=68 - 2 = 6.

Step-by-Step Solution

1
Calculate the number of host bits available in the CIDR prefix.
32 total IPv4 bits - 29 network bits = 3 host bits.
IPv4 addresses consist of 32 bits total.
2
Calculate total IP addresses supported by 3 host bits.
2^3 = 8 total IP addresses.
Each host bit doubles the number of possible IP addresses.
3
Subtract reserved network and broadcast addresses.
8 total IPs - 2 = 6 usable host addresses.
The network address (all host bits 0) and broadcast address (all host bits 1) cannot be assigned to host interfaces.

Key Concept

Calculating usable host IP addresses in IPv4 subnetting by subtracting network and broadcast addresses.
Estimated Time:45s
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Topics

IPv4 Addressing and Subnetting

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