1. IP Addressing

2. What Is an IP Address? 86 90 94
MARIA AVE

3. w. x. y. z. 131.107.3.24 Network ID and Host ID Network ID Host ID
32 Bits
w. x. y. z.
Example:
Class B

4. Converting IP Addresses from Binary to Decimal1
128 64 32 16 8 4 2
8 Bits
255 Decimal Value

5. Address Classes w x y z Class A Class B Class C Network ID Host ID
Class B
Network ID
Host ID
1 0
Class C
Network ID
Host ID
1 1 0 w x y z

6. Network IDs (First Octet)
Address Class Summary
Number
of Networks
126
16,384
2,097,152
Number of Hosts
per Network
16,777,214
65,534
254
Class A
Class B
Class C
Range of
Network IDs (First Octet)
1 – 126
128 – 191
192 – 223

7. Addressing Guidelines
Network ID Cannot Be 127
127 is reserved for lookback functions
Network ID and Host ID Cannot Be 255 (All Bits Set to 1)
255 is a broadcast address
Network ID and Host ID Cannot Be 0 (All Bits Set to 0)
0 means “this network only”
Host ID Must Be Unique to the Network

8. Assigning Network IDs
Router 1 2 3
124.x.y.z z
y.z

9. Assigning Host IDs 1 2 3 Router 124.0.0.27 124.0.0.28 124.0.0.29
124.x.y.z z z 1 2 3

10. What Is a Subnet Mask? Distinguishes the Network ID from the Host ID
Used to Specify Whether the Destination Host is Local or Remote

11. Default Subnet Masks (No Subnetting)
Address
Class
Bits Used for Subnet Mask
Dotted Decimal
Notation
Class A
Class B
Class C
Class B Example
IP Address
16.200
0.0
Subnet Mask
Network ID
y.z
Host ID
w.x.
16.200

12. Determining the Destination of a Packet
Local and Destination Host’s Subnet Masks Are ANDed
1 AND 1 = 1
Other combinations = 0
If ANDed results of source and destination hosts match, the destination is local.
IP Address
Subnet Mask
Result

13. IP Addressing with IP Version 6
Expanded Addressing Capabilities
Simplified Header Format
Support for Time-Dependent Options
Support of IP Header Extensions for Future Technologies

14. Review What Is an IP Address? Address Classes Addressing Guidelines
What is Subnet Mask?
IP Addressing with IP Version 6