A network administrator provisions a small subnetwork for a server cluster using a subnet … — Cisco CCNA

A network administrator provisions a small subnetwork for a server cluster using a subnet mask with a prefix length of $/29$ . How many usable host IPv4 addresses are available on this subnet?

Answer: 6 usable host addresses

Answer

The subnet provides 6 usable host IPv4 addresses.

With a prefix length of

/29

, there are

32 - 29 = 3

host bits available. The formula to calculate usable host addresses is

2^n - 2

, where

n

is the host bit count. Calculating

2^3 - 2 = 8 - 2 = 6

yields 6 usable host addresses.

Step-by-Step Solution

Determine host bits from CIDR prefix

3 host bits

An IPv4 address consists of 32 bits, so

32 - 29 = 3

bits remain for host identification.

Calculate total IP address space

8 total addresses

Total address space equals

2^n

where

n

is the host bit count (

2^3 = 8

Subtract reserved addresses

6 usable host addresses

The network address (all host bits 0) and broadcast address (all host bits 1) cannot be assigned to end devices.

Key Concept

IPv4 Usable Host Calculation

Estimated Time:45s

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