A network technician is provisioning a new subnet for an office department that requires s… — CompTIA Network+

A network technician is provisioning a new subnet for an office department that requires static IPv4 addresses for $50$ workstation computers and $4$ network printers. Which of the following CIDR prefix lengths represents the smallest subnet mask that will accommodate all required devices while conserving address space?

A
$/27$
$/26$ Cevap
C
$/25$
D
$/28$

Cevap

The prefix length

/26

is the smallest subnet mask that provides enough usable host addresses (

62

) for the

54

required devices.

The correct answer specifying

/26

allocates

6

bits for the host portion of the address space (

32 - 26 = 6

). This creates

2^6 = 64

total IP addresses. Subtracting

2

addresses for the network ID and broadcast address results in

62

usable IP addresses, which efficiently accommodates the required

54

devices (

50

workstations +

4

printers) with minimal waste.

Adım Adım Çözüm

Calculate total required host addresses

50 \text{ workstations} + 4 \text{ printers} = 54 \text{ host addresses}

Both workstations and printers require individual usable host IP addresses on the network.

Determine the required number of host bits (

h

)

For

h = 6

host bits, total addresses =

2^6 = 64

. Usable addresses =

64 - 2 = 62

. Since

62 \ge 54

6

host bits are required.

The formula for usable hosts is

2^h - 2

, reserving one address for the network ID and one for the broadcast address.

Calculate the CIDR prefix length

Prefix length =

32 - 6 = 26

, denoted as

/26

IPv4 addresses consist of 32 total bits. Subtracting the host bits from 32 gives the network prefix length.

Anahtar Kavram

Calculating host requirements and CIDR prefix masks for IPv4 subnets

Tahmini Süre:1m 30s

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