A network administrator is configuring workstations on a branch office local area network … — CompTIA Network+

A network administrator is configuring workstations on a branch office local area network assigned the IPv4 address block $192.168.50.128/26$ . Which of the following IPv4 addresses are valid, usable host IP addresses within this subnet? (Select TWO.)

$192.168.50.130$ Answer
$192.168.50.189$ Answer
C
$192.168.50.128$
D
$192.168.50.191$

Answer

The addresses

192.168.50.130

and

192.168.50.189

are the valid usable host IP addresses within the

192.168.50.128/26

subnet.

For the assigned block

192.168.50.128/26

, the block size is

64

addresses. The network ID is

192.168.50.128

and the broadcast address is

192.168.50.191

. Usable host addresses range from

192.168.50.129

192.168.50.190

. Both

192.168.50.130

and

192.168.50.189

fall within this valid range.

Step-by-Step Solution

Calculate the block size and host capacity for the

/26

subnet prefix.

/26

prefix leaves

32 - 26 = 6

host bits. The total number of addresses in the subnet is

2^6 = 64

Determining the address block size establishes subnet boundaries.

Identify the network ID, broadcast address, and usable host address range.

Network ID:

192.168.50.128

. Broadcast Address:

192.168.50.128 + 64 - 1 = 192.168.50.191

. Usable Host Range:

192.168.50.129

through

192.168.50.190

Usable host IP addresses are bounded strictly between the network ID and broadcast address.

Evaluate the given choices against the usable host range.

192.168.50.130

and

192.168.50.189

fall within the

[192.168.50.129, 192.168.50.190]

range.

192.168.50.128

is the network ID and

192.168.50.191

is the broadcast address.

Network IDs and broadcast addresses are reserved and cannot be assigned to hosts.

Key Concept

IPv4 Subnet Masking and Host Range Determination

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