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Table Of Contents  CertiGuide to Network+
 9  Chapter 0101:  TCP/IP
      9  III  IP Address Details

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Class B
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IV  Loopback Addressing and Connections
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Class C

The final range to know is the Class C range. The first three bits are 110 and the default subnet mask is 255.255.255.0. Since the convention requires that the first and second bit be set to 1 with the third to 0, the binary math forces an address range of 192.168.n.n to 223.255.n.n. This moving to the right grants more unique network addresses, but at the expense of fewer clients on the network. The private class C network address range is 192.168.0.0 – 192.168.255.255.

Class C

Expect
to be tested on the Class C address range of 192.0.n.n to 223.255.255.0. Hosts can range from n.n.n.1 to n.n.n.254 .


While looking at the client side, have you seen that while the math is capable of going to 255, (8 bits using the power of 2 limits out to 255) the limit is set on the extreme ends to 254? This is not because 255 is not available. The low end of 0 is reserved for the local network only. While 255 is reserved for broadcast purposes.

This is the opposite of 0 and means everyone must listen to this data message. This reduces available number of hosts or in a custom subnet, the number of custom sub-nets.

Custom Subnets

Custom subnets are beyond the NETWORK+ test. Default subnets are valid test questions. The rest of the IP addresses are not available and reserved for special purposes.

Class D: 224 is class “D” and this is reserved for multicasting.



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IV  Loopback Addressing and Connections
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