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Copyright © 1997 Cisco Systems, Inc.
6-45CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
Subnetting Overview
Subnetting Overview
– Moving the network boundary to the right
creates additional subnetworks at the
expense of fewer hosts on each segment
– The new mask will contain additional
contiguous ones indicating by how many
bits the network portion has been
extended
• The formula 2
n
, where n equals the
number of extended bits, indicates the
maximum number of subnets created
6-46CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
IP Address Classes
IP Address Classes
– IP address and associated mask are represented in
32-bit dotted decimal
• Other formats are commonly used
– Decimal value in the first octet determines the class
of the address
• 001 - 126 = Class A
• 128 - 191 = Class B
• 192 - 223 = Class C
• 224 - 239 = Class D
• 240 - 254 = Class E
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