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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
Addressing Fundamentals
Internetworking Fundamentals
Instructor: Abdirahman I. Abdi
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
Methods of communicating in the LAN
Unicast
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Broadcast
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Multicast
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
16,777,214
65,534
254
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Reserved IPv4 Address Ranges
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Address types
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Network Address
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Broadcast Address
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Host Address
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Public Vs. Private Address
Public addresses are usable on the internet as well as internal networks
Private addresses are usable only in internal Networks
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Private IP addresses
Unrestricted use on private networks. Not routed across the Internet.
10.0.0.0 – 10.255.255.255 (10.0.0.0/8)
172.16.0.0 – 172.31.255.255 (172.16.0.0/20)
192.168.0.0 – 192.168.255.255 (192.168.0.0/24)
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Public IP addresses
Routed over the Internet Master holder is Internet Assigned Numbers
Authority (IANA) Assigned to regional registries and then to
ISPs ISPs allocate them to organisations and
individual users Use is strictly controlled as duplicate
addresses are not allowed
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AfriNIC (African Network Information Centre) - Africa Region http://www.afrinic.net
APNIC (Asia Pacific Network Information Centre) - Asia/Pacific Region http://www.apnic.net
ARIN (American Registry for Internet Numbers) - North America Region http://www.arin.net
LACNIC (Regional Latin-American and Caribbean IP Address Registry) - Latin America and some Caribbean Islands http://www.lacnic.net
RIPE NCC (Reseaux IP Europeans) - Europe, the Middle East, and Central Asia http://www.ripe.net
The major regional registries
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