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Zorluk: ZorIPv4 Addressing and Subnetting

A network administrator is allocating subnets from the assigned address block 192.168.100.0/24192.168.100.0/24 using Variable Length Subnet Masking (VLSM). Subnets must be provisioned sequentially starting from the beginning of the block, ordered from largest to smallest host capacity requirement:

1. Sales Division: requires 5858 usable host IP addresses
2. Marketing Division: requires 2828 usable host IP addresses
3. Executive Staff: requires 1212 usable host IP addresses

If the Sales Division is assigned the first subnet starting at 192.168.100.0192.168.100.0, what is the range of usable host IP addresses for the Marketing Division?

  1. 192.168.100.65192.168.100.65 through 192.168.100.94192.168.100.94Cevap
  2. B
    192.168.100.64192.168.100.64 through 192.168.100.95192.168.100.95
  3. C
    192.168.100.65192.168.100.65 through 192.168.100.126192.168.100.126
  4. D
    192.168.100.64192.168.100.64 through 192.168.100.93192.168.100.93

Cevap

The usable host IP address range for the Marketing Division is 192.168.100.65192.168.100.65 through 192.168.100.94192.168.100.94.
The Sales Division takes 192.168.100.0/26192.168.100.0/26 (6464 addresses), placing the next available network block at 192.168.100.64192.168.100.64. The Marketing Division requires 2828 usable hosts, requiring a block of at least 3030 IP addresses. A /27/27 subnet provides 3232 total addresses (252^5), creating a subnet range of 192.168.100.64192.168.100.64 to 192.168.100.95192.168.100.95. Omitting the reserved network ID (192.168.100.64192.168.100.64) and broadcast address (192.168.100.95192.168.100.95) leaves valid usable host addresses from 192.168.100.65192.168.100.65 through 192.168.100.94192.168.100.94.

Adım Adım Çözüm

1
Calculate subnet mask and address range for the Sales Division (58 hosts).
Sales needs 58+2=6058 + 2 = 60 total addresses. The smallest power of 22 greater than or equal to 6060 is 26=642^6 = 64 addresses (/26/26 prefix). Network ID: 192.168.100.0/26192.168.100.0/26, Broadcast: 192.168.100.63192.168.100.63.
Two addresses are reserved for network ID and broadcast address.
2
Determine the starting network address for the Marketing Division.
The next available IP address after the Sales broadcast address is 192.168.100.64192.168.100.64.
VLSM allocations must be contiguous without overlapping existing subnets.
3
Calculate prefix length and address block size for the Marketing Division (28 hosts).
Marketing needs 28+2=3028 + 2 = 30 total addresses. The smallest power of 22 greater than or equal to 3030 is 25=322^5 = 32 addresses (/27/27 prefix). Subnet block: 192.168.100.64/27192.168.100.64/27.
A /27/27 prefix provides 3232 total addresses (3030 usable).
4
Identify the usable host IP range for the Marketing Division.
Network ID: 192.168.100.64192.168.100.64. Broadcast address: 192.168.100.64+31=192.168.100.95192.168.100.64 + 31 = 192.168.100.95. Usable host range: 192.168.100.65192.168.100.65 to 192.168.100.94192.168.100.94.
Usable host range spans from Network ID + 1 up to Broadcast address - 1.

Anahtar Kavram

Variable Length Subnet Masking (VLSM) Host Capacity Allocation
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Konular

IPv4 Addressing and Subnetting

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