A network administrator is assigning static IP addresses to virtual machine interfaces wit… — CompTIA Network+

A network administrator is assigning static IP addresses to virtual machine interfaces within a subnet designated as $10.200.45.64/27$ . Which of the following IP addresses represent valid usable host addresses within this subnet? (Select TWO)

$10.200.45.65$ Answer
$10.200.45.94$ Answer
C
$10.200.45.64$
D
$10.200.45.95$

Answer

The addresses

10.200.45.65

and

10.200.45.94

are valid usable host addresses.

For a

/27

subnet starting at network ID

10.200.45.64

, the block contains 32 total IP addresses ending at

10.200.45.95

. The first address (

10.200.45.64

) serves as the network ID and the last address (

10.200.45.95

) serves as the subnet broadcast address. Therefore, the assignable usable host IP range spans from

10.200.45.65

10.200.45.94

, making

10.200.45.65

and

10.200.45.94

valid usable host IP addresses.

Step-by-Step Solution

Determine the total block size from the CIDR prefix.

/27

prefix length leaves

32 - 27 = 5

host bits. The total number of IP addresses in the block is

2^5 = 32

The CIDR prefix determines the number of bits allocated to the host portion of the address.

Calculate the network ID and broadcast address for the subnet.

The network address is

10.200.45.64

. The broadcast address is

10.200.45.64 + 32 - 1 = 10.200.45.95

The network address is the first IP in the block, and the broadcast address is the final IP in the block.

Identify the range of usable host IP addresses.

Excluding the network ID (

10.200.45.64

) and broadcast address (

10.200.45.95

) yields a usable host range from

10.200.45.65

10.200.45.94

Usable host addresses must exclude the reserved network ID and broadcast addresses.

Key Concept

IPv4 Subnet Boundaries and Usable Host Range Calculation

Estimated Time:1m 30s

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