A network administrator is configuring a interface on a switch assigned to the 192.168.4.1… — Cisco CCNA

A network administrator is configuring a interface on a switch assigned to the $192.168.4.128/26$ IPv4 network segment. Which IPv4 address represents a valid usable host address for this interface?

$192.168.4.150$ Answer
B
$192.168.4.128$
C
$192.168.4.191$
D
$192.168.4.192$

Answer

The address

192.168.4.150

is a valid usable host address in the

192.168.4.128/26

subnet.

For a

/26

prefix, 6 bits are available for hosts, providing a total of

2^6 = 64

addresses. The

192.168.4.128/26

subnet spans from

192.168.4.128

(Network ID) through

192.168.4.191

(Broadcast Address). The usable host range is

192.168.4.129

192.168.4.190

. The address

192.168.4.150

falls within this valid usable range.

Step-by-Step Solution

Determine the total block size from the prefix length.

/26

prefix leaves

32 - 26 = 6

host bits. The block size is

2^6 = 64

addresses.

Calculating block size establishes the boundary for subnet ranges.

Identify the network and broadcast addresses of the subnet.

The network address is

192.168.4.128

. The broadcast address is

192.168.4.128 + 64 - 1 = 192.168.4.191

Network and broadcast addresses mark the unassignable outer boundaries of the IPv4 block.

Calculate the range of usable host addresses.

First usable host =

192.168.4.129

; Last usable host =

192.168.4.190

Usable host addresses consist of all IP addresses strictly between the network ID and broadcast address.

Evaluate the given choices against the usable host range.

The address

192.168.4.150

falls within the range

[192.168.4.129, 192.168.4.190]

Only IP addresses in the usable range can be statically assigned to network interfaces.

Key Concept

IPv4 Subnet Boundaries and Usable Host Identification

Estimated Time:1m 0s

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