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Network fundamentals
CHAPTER #
5
Internet
Addressing
Internet
addressing
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IP
Structure
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Field
1
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.Field
2
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.Field
3
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.Field
4
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Network
portion
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Host
portion
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The
dotted decimal
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Binary
format
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11010000
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10011101
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00011000
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01101111
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Internet address classes
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CLASS
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DOTTED
DECIMALS
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CLASS
A
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n/w 1to126
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host
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host
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host
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CLASS
B
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n/w 128 to 191
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n/w
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host
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host
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CLASS
C
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n/w 192 to 223
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n/w
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n/w
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host
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CLASS
D
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n/w 224 to 239
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n/w
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n/w
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n/w
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CLASS
E
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RESERVED
FOR FUTURE USE
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IP Addressing rules
- No IP address can
start with 127, because it is reserved for loopback address.
- No IP address can
have 255 in any of the four fields, because it is used for broadcasting
address.
- IP address can be
possible with all of its network/host portion zero.
Reserved IP addressing
- The Internet assigned
Numbers authority (IANA) has reserved three blocks of address
for private use which companies can use for addressing their
internal hosts. They are
- 10.0.0.0 through
10.255.255.255
- 172.16.0.0 through
172.31.255.255
- 192.168.0.0
through 192.168.255.255
Subnetworks
- Network is organized
by dividing them into many subnet
- Subnet subnet mask
is a 32 bit address used to determine what subnet an IP address
belongs to.
- Subnet mask is used
to specify whether the destination address belong to local or
remote network.
- When a computer
sends an information to a destination it compares the following
logical process(ANDing)
IF
(Local IP address AND Local subnet mask) = (Remote IP address
AND Local subnet mask)
THEN
the destination is in the same subnet.
ELSE
the destination is in deferent subnet. |
Related Links
Test your Knoledge
Now it is test time.
Try this exam
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