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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

The next range to know is the Class B range. The first two bits are 10 and the default subnet mask is 255.255.0.0. Since the convention requires that the first bit be set to 1 and the second bit to 0, the binary math forces an address range of 128.0.n.n to 191.255.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 B network address range, for use within your organization but not for direct connection to the Internet, is 172.16.0.0 – 172.31.255.255.

Class B

Expect to be tested on the Class B address range of 128.0.n.n to 191.254.0.0. Hosts can range from n.n.0.1 to n.n.255.254.



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