NET+ Class 02/03/10 SUBNETTING

Subnetting 101

Object:

• What is subnetting
• Benefits of subnetting
• IP address
• Default Subnet Mask
• Subnet formula

IP

• 32 bits
• has Host bits
• has Network bits

*******EXAMPLE********

IP = 192.168.1.1

Subnet Mask = 255.255.255.0

Class = C

n-bits (network) vs. h-bits (host)

• nnnnnnnn.nnnnnnnn.nnnnnnnn.hhhhhhhh = 32 bits
• nnnnnnnn = 1 octet

CLASS BEGIN RANGE END RANGE

A 0 126

B 128 191

C 192 223

D 224 239 (multasking)

E 240 255 (Science & Research)

LOOPBACK 127 =127.0.0.1

Subnet Formula

Network = 2 * n power (n = number of network bits)

Host = 2 * h power -2 (h = number of host bits)