Deliverables Now that you understand how to make decisions regarding subnet mask

Question

Deliverables Now that you understand how to make decisions regarding subnet masks, work on the following problems: number of bits to borrow from the host field to use for the subnet field and the maximum number of host addresses available per subnet. 1. Given a Class C network and a number of sub- nets required, complete the table to identify the Number of Subn Number of Bits to Borro for the Subnet Field Maximum Number of Hosts per Subnet Subnet Mask in Binary and Decimal Representation ets Required 12 40 2. Given a Class B network and a number of subnets field and the maximum number of host addresses available per subnet. required, complete the table to identify the number of bits to borrow from the host field for the subnet Number of Subnets Required Number of Bits to Borrow for the Subnet Field Maximum Number of Hosts per Subnet Subnet Mask in Binary and Decimal Representation 35 200 400 field and the maximum number of host addresses 3. Given a Class A network and a number of subnets required, complete the table to identity the number of bits to borrow from the host field for the subnet available per subnet. Number of Subnets Required Number of Bits to Borro for the Subnet Field Maximum Number of Hosts per Subnet Subnet Mask in Binary and Decimal Representation 10 20 80 400 2000

Explanation / Answer

number of host bits in class A = 24

number of host bits in class B = 16

number of host bits in class A = 8

number of bits to be borrowed for subnets = ceil(log2(number of subnets))

number of bits for host after giving bits for subnets = number of host bits in class - number of subnet bits

number of host = 2number of bits for host after giving bits for subnets - 2

1).

Number of

subnets required

Number of bits to borrow

for the subnet field

Maximum number

of hosts per subnet

Subnet mask in binary and decimal representation

binary:11111111 11111111 11111111 10000000

decimal: 255:255:255:128

binary:11111111 11111111 11111111 11100000

decimal: 255:255:255:224

binary:11111111 11111111 11111111 11110000

decimal: 255:255:255:240

binary:11111111 11111111 11111111 11111000

decimal: 255:255:255:248

binary:11111111 11111111 11111111 11111100

decimal: 255:255:255:252

2).

Number of

Number of bits to borrow

Maximum number

binary:11111111 11111111 11100000 00000000

binary:11111111 11111111 11100000 00000000

binary:11111111 11111111 11111100 00000000

binary:11111111 11111111 11111111 00000000

binary:11111111 11111111 11111111 10000000

3).

Number of

Number of bits to borrow

Maximum number

binary:11111111 11110000 00000000 00000000

binary:11111111 11111000 00000000 00000000

binary:11111111 11111110 00000000 00000000

binary:11111111 11111111 10000000 00000000

binary:11111111 11111111 11100000 00000000

Number of

subnets required

Number of bits to borrow

for the subnet field

Maximum number

of hosts per subnet

Subnet mask in binary and decimal representation

2 ceil(log22) = 1 27-2 = 126

binary:11111111 11111111 11111111 10000000

decimal: 255:255:255:128

5 ceil(log25)=   3 28-3-2 = 30

binary:11111111 11111111 11111111 11100000

decimal: 255:255:255:224

12 ceil(log212)= 4 28-4-2 = 14

binary:11111111 11111111 11111111 11110000

decimal: 255:255:255:240

24 ceil(log224) =5 28-5-2 = 6

binary:11111111 11111111 11111111 11111000

decimal: 255:255:255:248

40 ceil(log240)=6 28-6-2 = 2

binary:11111111 11111111 11111111 11111100

decimal: 255:255:255:252

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