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Zorluk: OrtaIPv4 Addressing and Subnetting

A network technician is configuring static IPv4 addresses for new network monitoring probes on a subnetwork assigned the address block 192.168.50.144/28192.168.50.144/28. Which of the following IP addresses are valid usable host addresses on this subnet? (Select two.)

  1. 192.168.50.146192.168.50.146Cevap
  2. 192.168.50.157192.168.50.157Cevap
  3. C
    192.168.50.144192.168.50.144
  4. D
    192.168.50.159192.168.50.159

Cevap

The addresses 192.168.50.146192.168.50.146 and 192.168.50.157192.168.50.157 are valid usable host addresses on the 192.168.50.144/28192.168.50.144/28 subnet.
For the network block 192.168.50.144/28192.168.50.144/28, the /28/28 prefix yields a block size of 16 (256−240256 - 240). The subnet boundaries are defined by the network ID 192.168.50.144192.168.50.144 and the broadcast address 192.168.50.159192.168.50.159. Therefore, valid host IP addresses must fall strictly between 192.168.50.145192.168.50.145 and 192.168.50.158192.168.50.158. The addresses 192.168.50.146192.168.50.146 and 192.168.50.157192.168.50.157 fall within this range.

Adım Adım Çözüm

1
Determine the subnet mask and block size from the CIDR prefix.
A /28/28 prefix corresponds to a subnet mask of 255.255.255.240255.255.255.240. The block size (increment) per subnet is 256−240=16256 - 240 = 16.
Calculating the block size identifies the boundary and increment for the subnet range.
2
Identify the network ID and broadcast address for the subnet.
The network ID is 192.168.50.144192.168.50.144. The next subnet starts at 144+16=160144 + 16 = 160, making the broadcast address 192.168.50.159192.168.50.159.
Network ID and broadcast address delineate the extreme boundaries of the subnet.
3
Calculate the usable host address range.
The first usable host address is 192.168.50.145192.168.50.145 and the last usable host address is 192.168.50.158192.168.50.158.
Usable host addresses exclude the network ID and broadcast address (2n−22^n - 2).
4
Evaluate the candidate options against the usable host range.
192.168.50.146192.168.50.146 and 192.168.50.157192.168.50.157 lie strictly within the range 192.168.50.145192.168.50.145–192.168.50.158192.168.50.158, while 192.168.50.144192.168.50.144 is the network ID and 192.168.50.159192.168.50.159 is the broadcast address.
Only IP addresses within the usable host range can be statically configured on end-device interfaces.

Anahtar Kavram

IPv4 Usable Host Address Range Calculation
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Konular

IPv4 Addressing and Subnetting

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