© 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 4 Broadcast

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 5 Multicast

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 6

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 7 16,777,214 65,

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 8 Reserved IPv4 Address Ranges

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 9 Address types

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 10 Network Address

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 11 Broadcast Address

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 12 Host Address

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 13 Public Vs. Private Address Public addresses are usable on the internet as well as internal networks Public addresses are usable on the internet as well as internal networks Private addresses are usable only in internal Networks Private addresses are usable only in internal Networks

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 14 Private IP addresses Unrestricted use on private networks. Not routed across the Internet. Unrestricted use on private networks. Not routed across the Internet – ( /8) – ( /8) – ( /20) – ( /20) – ( /24) – ( /24)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 15 Public IP addresses Routed over the Internet Routed over the Internet Master holder is Internet Assigned Numbers Authority (IANA) Master holder is Internet Assigned Numbers Authority (IANA) Assigned to regional registries and then to ISPs Assigned to regional registries and then to ISPs ISPs allocate them to organisations and individual users ISPs allocate them to organisations and individual users Use is strictly controlled as duplicate addresses are not allowed Use is strictly controlled as duplicate addresses are not allowed

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 16 AfriNIC (African Network Information Centre) - Africa Region APNIC (Asia Pacific Network Information Centre) - Asia/Pacific Region ARIN (American Registry for Internet Numbers) - North America Region LACNIC (Regional Latin-American and Caribbean IP Address Registry) - Latin America and some Caribbean Islands RIPE NCC (Reseaux IP Europeans) - Europe, the Middle East, and Central Asia The major regional registries

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 17