A network technician is configuring an isolated network segment with an IPv4 subnet prefix… — CompTIA Network+

A network technician is configuring an isolated network segment with an IPv4 subnet prefix of $/29$ . What is the maximum number of usable host IPv4 addresses that can be assigned to devices on this subnet?

$6$ Answer
B
$8$
C
$14$
D
$4$

Answer

The maximum number of usable host IPv4 addresses on a

/29

subnet is

6

For a CIDR prefix of

/29

, there are

32 - 29 = 3

bits available for host addressing. The formula for usable hosts is

2^h - 2

, where

h

is the number of host bits. Therefore,

2^3 - 2 = 8 - 2 = 6

usable addresses.

Step-by-Step Solution

Calculate the number of host bits available.

An IPv4 address has

32

bits. For a

/29

prefix, the host portion is

32 - 29 = 3

bits.

The prefix length specifies the network portion, leaving the remaining bits for host addressing.

Calculate total IP addresses in the subnet block.

2^3 = 8

total IP addresses.

The total number of addresses supported by

n

host bits is given by the formula

2^n

Subtract reserved network and broadcast addresses.

8 - 2 = 6

usable host IP addresses.

The first address in the block is the network identifier and the last address is the broadcast address; neither can be assigned to host interfaces.

Key Concept

IPv4 Subnet Usable Host Calculation

Estimated Time:45s

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