CCNA 2.2 IP Addressing
- An IP address consists of 32 bits of information (divide into four octets)
- The 32 bit IP address is a structured or hierarchical address
- Network address uniquely identifies each network
- Node/Host address uniquely identifies each device on a network
- Three classes of networks:
- In Class A network address the first bit of the first byte must always be off (0-127)
- In Class B network address the first bit of the first byte must always be on but the second bit is always off (128-191)
- In Class C network address the first two bit of the first byte must always be on (192-223)
- Class D network is used for multicast address (224-239)
- Class E network is used for scientific purpose (240-255)
- Reserved IP addresses:
![](http://1.bp.blogspot.com/_GKROBw-pB0U/SjB3cDEu6CI/AAAAAAAAAGU/ddWSRgZR6WY/s320/reverse+ip+address.jpg)
- Private IP address is used for security measure and saving IP address space
- Reserved private IP address space:
![](http://4.bp.blogspot.com/_GKROBw-pB0U/SjB65lgjBSI/AAAAAAAAAGc/f6sj38Fx8c4/s320/reserved+ip+address.jpg)
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