```Binary to Decimal Conversion
27
128
26
64
25
32
24
16
23
8
22
4
21
2
20
1
A computer only knows binary (0s and 1s)
An IP address in IP version 4 has
32 bits
(separated by periods into 4 octets)
11000000.10101000.00001010.10010110
Humans are more familiar with
decimal numbers, so we use a
Dotted decimal format
has a Binary equivalent of
11000000.10101000.00001010.10010110
Conversion can be done in Windows calculator. Make sure to
include any leading zeros to make a full octet.
Network Number and Host Number.
the Network Number is 192.168.10
and the Host Number is 150
The Correct Notation is 192.168.10.0
and 0.0.0.150
Class
A
Decimal
0-126
Binary
00000000 01111110
B
128-191
1000000 10111111
C
192-223
11000000 –
11011111
• In binary, the highest number 8 bits can
designate is 11111111 or 255 in decimal.
A
255.0.0.0
11111111.00000000.00000000.00000000
B
255.255.0.0
11111111.11111111.00000000.00000000
C
255.255.255.0
11111111.11111111.11111111.00000000
To differentiate between the network portion and the host
192.168.10.150 is 255.255.255.0
In binary:
11000000.10101000.00001010.10010110
11111111.11111111.11111111.00000000
11000000.10101000.00001010.00000000
192
.168
.10
.0
Convert decimal to binary in
Windows calculator
• Go to Start, Run and type in: calc
• Type in a decimal number: 100
• Click on radio button beside bin (binary)
and the binary equivalent will show in
the answer box: 1100100 (7 bits)
• Be careful the answer box doesn’t show
Ipconfig - Windows 2000
•
•
•
•
•
Go to Start, Run and type in cmd
Type in ipconfig /?
Type in ipconfig /all
Type in ipconfig /release
Type in ipconfig /renew
PING
Packet Internet Groper (PING) is a utility that
can verify that TCP/IP is installed, bound to
the NIC, configured correctly, and
communicating with the network.
• Type ping 127.0.0.1
• Type ping another computer in your
network
• Type ping your default gateway
• Type ping www.yahoo.com (internet host)
An Example
• Subnet a Class C network, 200.133.175.0, into 14
subnets for security, traffic control and multiple
locations.
• 2n - 2 = number of subnets (need minimum of 14
subnets) where n = number of bits borrowed
2?-2 > 14
24-2 = 16
• Borrow four bits = subnet mask 255.255.255.240
• Table
An Example
200.133.175.0
11001000.100000101.10101111.00000000
255.255.255.240
11111111.11111111.11111111.11110000
Example
```

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