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Transcript 
Ch.9 – IP Addressing
Part 1
CCNA 1 version 3.1
IP Addressing
192.168.1.0
10.2.0.0
•
192.4.0.0
172.0.0.0
Broadcast Address
– Used to send data to all devices on the network
– All ones in the host portion of the address
– All devices pay attention to a broadcast
– Broadcast addresses cannot be used as an address for any device that
is attached to the network.
– What are the broadcast addresses for these networks?
Addressing: Network & Host
192.168.1.0
10.2.0.0
192.4.0.0
172.0.0.0
Routers are required when two hosts with
IP addresses on different networks or subnets need to communicate.
• What are some example Host IP addresses?
Host Addresses
•
•
Network Addresses include a range of HOST IP addresses
For every network (or subnet) two address cannot be used for HOST
IP addresses:
1. Network Address – The address that represents the network.
2. Broadcast Address – The address used to communicate with all
devices on the network.
Addressing Hosts
Given the 172.16.0.0 address with the 255.255.0.0 subnet mask:
Network Network
172
16
Host
Host
0
0
One network address, 65,534 hosts, one broadcast address.
172
16
0
0
172
172
172
16
16
16
0
Etc.
255
1
Etc.
254
172
16
255
255
1 Network
Address
65,534 Host
Addresses
216 - 2
1 Broadcast
Address
Range of hosts – Your Turn!
• Host addresses are all addresses between the network
address and the broadcast address.
• What is the range of host addresses for each
network?
Network Address
Subnet Mask
Broadcast Address
172.0.0.0
255.0.0.0
172.255.255.255
172.16.0.0
255.255.0.0
172.16.255.255
192.168.1.0
255.255.255.0
192.168.1.255
192.168.0.0
255.255.0.0
192.168.255.255
192.168.0.0
255.255.255.0
192.168.0.255
10.1.1.0
/24
10.1.1.255
10.2.0.0
/16
10.2.255.255
10.0.0.0
/16
10.0.255.255
Range of hosts – Your Turn!
Network Address
Subnet Mask
172.0.0.0
255.0.0.0
172.0.0.1 through 172.255.255.254
Broadcast Address
172.255.255.255
172.16.0.0
255.255.0.0
172.16.0.1 through 172.16.255.254
172.16.255.255
192.168.1.0
255.255.255.0
192.168.1.1 through 192.168.1.254
192.168.1.255
192.168.0.0
255.255.0.0
192.168.255.255
192.168.0.1 through 192.168.255.254
192.168.0.0
255.255.255.0
192.168.0.1 through 192.168.0.254
192.168.0.255
Range of hosts – Your Turn!
Network Address
Subnet Mask
Broadcast Address
10.1.1.0
/24
10.1.1.1 through 10.1.1.254
10.1.1.255
10.2.0.0
/16
10.2.0.1 through 10.2.255.254
10.2.255.255
10.0.0.0
/16
10.0.0.1 through 10.0.255.254
10.0.255.255
Subnet Masks: Non-Natural Boundaries
• Subnet masks do not have to end on natural octet
•
boundaries
Convert these to binary:
Network Address
172.1.16.0
Subnet Mask
255.255.240.0
192.168.1.0
255.255.255.224
Subnet Masks: Non-Natural Boundaries
• Subnet masks do not have to end on natural octet
boundaries
172.1.16.0
255.255.240.0
10101100.00000001.00010000.00000000
11111111.11111111.11110000.00000000
• What is the range of host addresses in dotted•
•
decimal and binary?
What is the broadcast address?
How many host addresses?
Subnet Masks: Non-Natural Boundaries
• Subnet masks do not have to end on natural octet
boundaries
172.1.16.0
255.255.240.0
172.1.16.1
172.1.16.2
172.1.16.3
…
172.1.16.255
172.1.17.0
172.1.17.1
…
172.1.31.254
10101100.00000001.00010000.00000000
11111111.11111111.11110000.00000000
10101100.00000001.00010000.00000001
10101100.00000001.00010000.00000010
10101100.00000001.00010000.00000011
10101100.00000001.00010000.11111111
10101100.00000001.00010001.00000000
10101100.00000001.00010001.00000001
10101100.00000001.00011111.11111110
Subnet Masks: Non-Natural Boundaries
• Subnet masks do not have to end on natural octet
boundaries
172.1.16.0
255.255.240.0
10101100.00000001.00010000.00000000
11111111.11111111.11110000.00000000
172.1.16.1
…
172.1.31.254
10101100.00000001.00010000.00000001
172.1.31.254
(broadcast)
10101100.00000001.00011111.11111111
10101100.00000001.00011111.11111110
Number of hosts: 212 – 2 = 4,096 – 2 = 4,094 hosts
Subnet Masks: Non-Natural Boundaries
• Subnet masks do not have to end on natural octet
boundaries
192.168.1.0
255.255.255.224
11000000.10101000.00000001.00000000
11111111.11111111.11111111.11100000
192.168.1.1
192.168.1.2
192.168.1.3
…
192.168.1.29
192.168.1.30
11000000.10101000.00000001.00000001
11000000.10101000.00000001.00000010
11000000.10101000.00000001.00000011
192.168.1.31
(broadcast)
11000000.10101000.00000001.00011111
11000000.10101000.00000001.00011101
11000000.10101000.00000001.00011110
Subnet Masks: Non-Natural Boundaries
• Subnet masks do not have to end on natural octet
boundaries
192.168.1.0
255.255.255.224
11000000.10101000.00000001.00000000
11111111.11111111.11111111.11100000
192.168.1.1
…
192.168.1.30
11000000.10101000.00000001.00000001
192.168.1.31
(broadcast)
11000000.10101000.00000001.00011111
11000000.10101000.00000001.00011110
Number of hosts: 25 – 2 = 32 – 2 = 30 hosts
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