Question

THE FOLLOWING NETWORK 192.168.0.0 255.255.254.0 IS A SUPERNET WHICH COMBINES

TWO (2) CLASS C NETWORKS.

AFTER REVIEWING THE STATEMENT ABOVE WHAT CAN YOU SAY ABOUT THE FOLLOWING ADDRESS

192.168.0.255/23. (THE /23 IS CIDER NOTATION) AND WHAT ARE THE TWO CLASS C NETWORKS COVERED

BY THE SUBNET MASK OF 255.255.254.0 ?

Answer 1

192.168.0.0=>supernet id

255.255.254.0 =>supernet mask/subnet mask

Supernetting is a method which combines two networks.

Class C addresses have first 3 octets as network bits and remaining one octet as host bits.

255.255.254.0 subnet gives number of network bits in the each octet. All octets are full. Expect 3^rd octet because it is less than 255.

This subnet mask indicates that 23 bits are network bits from LSB.

255.255.254.0 => 11111111.11111111.11111110.00000000

As Class C addresses have all 3 octets complete, given subnet mask allows 2 class c networks those are

192.168.00000000.00000000/24 where 24 bits are network bits

192.168.00000001.00000000/24

192.168.0.255/23 :/23 indicates number network bits

Two /24 networks are divided into /23 network. So, hosts will be addressed with /24 CIDR notation.

Given host ip address with /23 is not valid.