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scope of this discussion.) These classes have different uses
and characteristics.
Class A networks are the Internet's largest networks, each with
room for over 16 million hosts. Up to 126 of these huge
networks can exist, for a total of over 2 billion hosts. Because of
their huge size, these networks are used for WANs and by
organizations at the infrastructure level of the Internet, such as
your ISP.
Class B networks are smaller but still quite large, each able to
hold over 65,000 hosts. There can be up to 16,384 class B
networks in existence. A class B network might be appropriate
for a large organization such as a business or government
agency.
Class C networks are the smallest, only able to hold 254 hosts
at most, but the total possible number of class C networks
exceeds 2 million (2,097,152 to be exact). LANs connected to
the Internet are usually class C networks.
Some important notes regarding IP addresses:
•
The class can be determined easily from field1:
field1 = 1-126:
Class A
field1 = 128-191:
Class B
field1 = 192-223:
Class C
(field1 values not shown are reserved for special uses)
•
A host ID can have any value except all fields set to 0 or all
fields set to 255, as those values are reserved for special
uses.
Subnet masks
Definition
mask
A
mask
looks like a regular IP address, but contains a pattern of
bits that tells what parts of an IP address are the network ID and
what parts are the host ID: bits set to 1 mean "this bit is part of the
network ID" and bits set to 0 mean "this bit is part of the host ID."
Subnet masks
are used to define
subnets
(what you get after
dividing a network into smaller pieces). A subnet's network ID is
created by "borrowing" one or more bits from the host ID portion
of the address. The subnet mask identifies these host ID bits.
For example, consider a class C network 192.168.1. To split this
into two subnets, you would use the subnet mask:
255.255.255.128
It's easier to see what's happening if we write this in binary:
11111111. 11111111. 11111111.10000000
As with any class C address, all of the bits in field1 through
field3 are part of the network ID, but note how the mask
specifies that the first bit in field4 is also included. Since this
extra bit has only two values (0 and 1), this means there are two
subnets. Each subnet uses the remaining 7 bits in field4 for its
host IDs, which range from 1 to 126 hosts (instead of the usual
0 to 255 for a class C address).
Similarly, to split a class C network into four subnets, the mask
is:
Summary of Contents for WRC5000N
Page 15: ...WELL WRC500N WRC5010N WRC5010NU 15 3 Double click on Internet Protocol TCP IP ...
Page 25: ...WELL WRC500N WRC5010N WRC5010NU 25 4 Double click on Internet Protocol Version 4 TCP IPv4 ...
Page 30: ...WELL WRC500N WRC5010N WRC5010NU 30 3 Click on the ratio of Gateway and then click on Next ...
Page 35: ...WELL WRC500N WRC5010N WRC5010NU 35 2 Double click Network Connections ...
Page 75: ...WELL WRC500N WRC5010N WRC5010NU 75 Figure 8 Wireless Network page ...
Page 113: ...WELL WRC500N WRC5010N WRC5010NU 113 7 Click on Turn on network discovery and file sharing ...
Page 115: ...WELL WRC500N WRC5010N WRC5010NU 115 9 AP s icon will show up Double click on it ...
Page 117: ...WELL WRC500N WRC5010N WRC5010NU 117 11 Enter AP s Self PIN Number and click next ...
Page 119: ...WELL WRC500N WRC5010N WRC5010NU 119 13 Enter the Passphrase and then click Next ...
Page 176: ...WELL WRC500N WRC5010N WRC5010NU 176 ...