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IP Addressing

IP Addressing. Higher Computing. TCP/IP. TCP/IP is the communication protocol for the internet. TCP/IP defines the rules computers must follow to communicate with each other over the internet. Allows computers on different networks to communicate with each other.

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IP Addressing

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  1. IP Addressing Higher Computing

  2. TCP/IP • TCP/IP is the communication protocol for the internet. • TCP/IP defines the rules computers must follow to communicate with each other over the internet.

  3. Allows computers on different networks to communicate with each other. The computers could be on different LANs in the same building or on two LANs in different countries. TCP/IP

  4. Browsers and servers use TCP/IP to connect to the Internet. A browser uses TCP/IP to access a server. A server uses TCP/IP to send HTML back to a browser. Browsers and Servers

  5. TCP/IP stands for Transmission Control Protocol / Internet Protocol. TCP/IP defines how electronic devices (like computers) should be connected to the Internet, and how data should be transmitted between them. TCP/IP

  6. TCP/IP • TCP is responsible for breaking data down into IP packets, giving each packet a sequence number and for assembling the packets when they arrive. • IP is responsible for sending the packets to the correct destination.

  7. IP Addressing • Each computer must have an IP address before it can connect to the Internet. • Each IP packet must have an address before it can be sent to another computer.

  8. Structure of IP addresses • IP address is a 32-bit number made up of four parts called octets • Usually displayed as four decimal numbers, e.g. • 172.63.238.106 • Each octet must be in the range of 0 to 255. • 0 and 255 are set aside for special purposes

  9. Possible number of IP addresses • An IP address is 32 bits long. • This means that there are 232 possible IP addresses, approx 4.3 billion. • However…

  10. Public/Private IP addressing • Computers on private LANs do not need a public IP addresses, since they do not need to be accessed by the public. • Therefore, certain addresses that will never be registered publicly are reserved. These are known as private IP addresses, and are found in the following ranges: • From 10.0.0.0 to 10.255.255.255From 172.16.0.0 to 172.31.255.255From 192.168.0.0 to 192.168.255.255

  11. Public/Private IP addressing • Devices with private IP addresses cannot connect directly to the Internet • Computers outside the network cannot access devices with a private IP address. • Access must be obtained through a router.

  12. Static IP addressing • A static IP address is where the computers are given a fixed IP address that never changes. • The computer always keeps the same address every time it connects to the Internet.

  13. Dynamic IP addressing • There are only a limited number of IP addresses. ISPs use dynamic IP addressing to get around the problem. • A dynamic IP address is when computers on a network are given an IP address when they are connected to the network for that session. It can change each time they are connected.

  14. Less security risk- computer is assigned a new IP address each time you connect to a network. Benefits of Dynamic IP addressing

  15. Classes of IP addresses • There are 4 classes of IP addresses: • Class A • Class B • Class C • Class D

  16. Classes of IP addresses • Different classes of IP addresses are achieved by splitting the octets into two parts called the network identifier and the node identifier. • Network identifier = n • Node identifier = h

  17. Classes of IP addresses • The network identifier is used to route packets to the destination network. • On arrival at the network, the host identifier is used to route packets to the individual computer. nnn.nnn.hhh.hhh Network Node

  18. Class A • Class A addresses are structured as follows: • nnn.hhh.hhh.hhh • The first octet will be in the range of 1 to 126 and identifies the network • The remaining three octets will identify the nodes on that network. • This allows for 16, 277, 214 addresses. (224 -2)

  19. Class B • Class B addresses are structured as follows: • nnn.nnn.hhh.hhh • The first octet will be in the range of 128 to 191. • The first two octets identify the network. • The remaining octets identify the nodes on that network • This allows for 65,534 addresses. (216 – 2)

  20. Class C • Class C addresses: • nnn.nnn.nnn.hhh • The first octet is in the range of 192 to 223 . • The first three octets identify the network. • The last octet identifies the nodes on that network. • This allows for 254 different addresses (28 – 2)

  21. Class D • These are not used for networks, but for multicast messaging. • The first octet will be in the range of 224 to 255.

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