5. Class Inter Domain Routing (CIDR)
192.168.1.0/28
• The /28 refers to the number of bits that are turned on.
• Remember:There are 32 bits in an IP Address, with 4 octets, hence
8 bits per octet.
• A class A address has a subnet mask of 255.0.0.0.This means that
all the bits in the first octe have been turned on.To achieve the
slash function, count the number of turned on Bits in the mask.
• The 255.0.0.0 is considered a /8 since only 8 bits are 1’s
9. A subnet mask of 255.255.255.192,
a)Number of subnets
11
b)Number of valid hosts per subnet?
000000,
10. • What are the valid subnets?
• What’s the broadcast address of each subnet?
11. • What are the valid hosts in each subnet?
Valid hosts are the numbers between the subnets, omitting the all-
0s and all-1s. For example, if 64 is the subnet number and 127 is the
broadcast address, then 65–126 is the valid host range.Your valid
range is always the group of numbers between the subnet address
and the broadcast address.
• SIMPLE?Yeah!!!!!! Cool!!!!!!! QUIZTIME
12.
13.
14. Questions
1. We’ll subnet the network address 192.168.10.0 and subnet mask 255.255.255.224
2. Let’s practice another one:
Let’s keep practicing:
Okay—just one more: