fjhg

4. SUBNETTING
INTERNET ADDRESS (32 bits)
No. of BITS CLASS CODE
VALUE CODE NETWORK HOST
A 0 1 7 24
B 10 2 14 16
C 110 3 21 8
Table 4.1 – IP Addressing
· Subnetting is achieved by ‘stealing’ 2, or
more, leading bits from the bits assigned
for host addresses
· E.g. Class B address 158.94.0.0 has 16
bits assigned to host addresses. Hosts
cannot be assigned with an IP address
consisting of all-1's, or all-0’s in the host
portion
- i.e. 158.94.255.255 & 158.94.0.0 may
not be assigned
2
- 158.94.0.0 is, in binary, equivalent
to:
- if 2 host bits are stolen th...