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Difficulty: HardIPv4 Addressing and Subnetting

A network administrator is auditing static IP assignments on a database cluster segment configured with the IPv4 subnet block 10.150.96.64/2610.150.96.64/26. Which of the following IP addresses are valid, assignable host addresses within this specific subnet range? (Select TWO.)

  1. A
    10.150.96.6410.150.96.64
  2. 10.150.96.9510.150.96.95Answer
  3. 10.150.96.12610.150.96.126Answer
  4. D
    10.150.96.12710.150.96.127

Answer

The valid assignable host addresses are 10.150.96.9510.150.96.95 and 10.150.96.12610.150.96.126.
For the subnet 10.150.96.64/2610.150.96.64/26, the network ID is 10.150.96.6410.150.96.64 and the broadcast address is 10.150.96.12710.150.96.127. The range of addresses usable for host assignment is 10.150.96.6510.150.96.65 through 10.150.96.12610.150.96.126. Both 10.150.96.9510.150.96.95 and 10.150.96.12610.150.96.126 reside within this valid host range.

Step-by-Step Solution

1
Determine the subnet mask and block size from the CIDR prefix.
A prefix of /26/26 corresponds to a subnet mask of 255.255.255.192255.255.255.192. The block size is 256−192=64256 - 192 = 64.
Calculating the block size identifies the IP increment between subnets.
2
Identify the network address and broadcast address for the given block.
The network address is 10.150.96.6410.150.96.64. The next subnet boundary starts at 10.150.96.12810.150.96.128, making the broadcast address for this segment 10.150.96.12710.150.96.127.
The network address is the first address of the block, and the broadcast address is the final address before the next subnet.
3
Determine the range of usable host IP addresses.
The usable host IP range spans from 10.150.96.6510.150.96.65 (Network ID + 1) to 10.150.96.12610.150.96.126 (Broadcast ID - 1).
Network and broadcast addresses are reserved and cannot be assigned to host interfaces.
4
Evaluate the candidate options against the usable host range.
10.150.96.9510.150.96.95 and 10.150.96.12610.150.96.126 fall inside the usable range (10.150.96.6510.150.96.65 - 10.150.96.12610.150.96.126), whereas 10.150.96.6410.150.96.64 and 10.150.96.12710.150.96.127 are reserved.
Only IP addresses within the usable range can be assigned to host devices.

Key Concept

IPv4 Subnet Boundaries and Usable Host Range
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Topics

IPv4 Addressing and Subnetting

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