Cisco 2521LF - 2521LF Router Manuel d'utilisateur Page 23

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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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