- What is CIDR ?
- How CIDR Came into Picture ?
- What CIDR do ?
1. IP Addresses
IP Address -
Everyone has some Address, so as these devices also have an Internet Protocol Address (IP Address), also called as Logical Address.
By their Name that are unique for each of them.
Structure of IP Address -
So, 0’s for Other and 1 for the Number whose sum will be 192
Type of IP Address -
- Assignment Method
- Classes : 1) Classful
- Public / Private
Assignment Methods :
- IP Address begins with 0,First Bit will always be Zero
- 7 Remaining Bits in Network part : Only 128 Possible class A Network
- 24 Bits in Local Part : Over 16 million hosts per Class A Network
- All class A network parts are assigned or reserved.
- First two Bit will always be One and Zero
- 14 Bits in Network part - Over 16,000 possible Class B Network
- 16 Bits in Local Part - Over 65,000 possible Hosts
- First three Bit will always be One,One and Zero
- 21 Bits in Network part - Over 2 Million possible Class C Network
- 8 Bits in Local Part - Only 256 possible Hosts per class C Network
IP Address begins with 1110
Used for Multicasting, Not defining networks.
- Sending messages to group of hosts
- just to one (Unicasting)
- ALL HOSTS (Broadcasting)
- Say to send a videoconference stream to a group of receivers
All OSPF Routers address is used to send HELLO PACKETS
All the routers address is used to send OSPF routing information to designated routers on a network segment.
used to send routing information to all EIGRP routers on a network segment.
- Addresses beginning with 127 are reserved for loopback and internal testing - Used for Self Testing that TCP/IP is properly working or not.
- XXX.0.0.0 reserved for Network Address
- XXX.255.255.255 reserved for Broadcast
- 0.0.0.0 - First Address - Represent Local Network / Used for Default Routing
- 255.255.255.255 - Broadcast