
24
Copyright © 1997 Cisco Systems, Inc.
6-47CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
Address Class Usage
Address Class Usage
–Address classes A, B, and C are available for
Internet use
–Some Class D multicast addresses are used by
routing protocols
•OSPF— 224.0.0.5, 224.0.0.6
•RIPv2— 224.0.0.9
•EIGRP— 224.0.0.10
–Other Class D multicast addresses are used by
videoconferencing or other applications
6-48CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
Planning an IP Address
Hierarchy
Planning an IP Address
Hierarchy
– Does a telephone switch in California know how
to reach a specific phone (1-703-555-1212) in
Virginia?
Long (Remote)
Distance
Long Distance
Virginia
Path to 703
(An Area Code
Summarizes
an Area in VA)
Path to 555
(A Prefix
Summarizes
a Smaller Area
in VA)
Path to 1212
(Number)
Local Office
Alexandria
Local
Office
Aunt JudyCalifornia
Path to 1
(A Number
Indicates
Destination
Is Remote)
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