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IP Addressing

IP Addressing. Lecture # 1 Hassan Shuja 01/31/2006. IP Addressing. What is it An IP address is an address used to uniquely identify a device on an IP network An address is a 32-bit numeric address written as four numbers separated by periods IPv4 is made up of 5 different classes

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IP Addressing

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  1. IP Addressing Lecture # 1 Hassan Shuja 01/31/2006

  2. IP Addressing • What is it • An IP address is an address used to uniquely identify a device on an IP network • An address is a 32-bit numeric address written as four numbers separated by periods • IPv4 is made up of 5 different classes • Class A,B,C,D,E • Class A,B,C are standard Internet and intranet routable addresses • Private addresses are only intranet routable • Class D are Multicast addresses and class E are used for research

  3. IP Addressing • What is it • IP addresses are used by routers to route packets to destinations

  4. IP Addressing • What is it • An address is made up of a network portion and a host portion • The network portion is used to identify the network • Does not change within a network or subnetwork • The host portion is the range of addresses assigned to nodes on the network • Standard Network & Host portion of Class A,B,C Class A n h.h.h Class B n.n h.h Class C n.n.n h

  5. IP Addressing • Obtaining IP Addresses • IANA is the governing body for all IP addresses and has regional registry organizations • American Registry for Internet Numbers (ARIN) supports North America region • IANA requires justification before they allocate a range of IP addresses for somebody • Most IP addresses these days are obtained through ISPs

  6. IP Addressing • Subnet Mask • A 32-bit value that is used to distinguish the network ID portion of the IP address from the host ID • Subnet Masks determines size of local subnet • Helps determine if two addresses are on the same network • Default Gateway • Default Gateway handles requests that are destined for outside of the local subnet • The address of the router on the local subnet

  7. IP Addressing • Subnetting • A Method use to break up large networks into smaller ones • Splits the host field into a subnet and host section • This splitting is determined by the subnet mask • The Network field remains unchanged • Subnetting allows for ease of administration, conservation of IP addresses, limit broadcast domains, and efficient use of resources • Converting Decimal to Binary • http://www.cuyamaca.net/curtis.sharon/pdf/CiscoLabs/lab_1_2_5.pdf

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