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F O C U S FOCUS CISCO IP Addressing & The Binary System A Cisco Networking Presentation By Joe Reed Basic Goals for Addressing Understand why IP addresses are necessary Understand each network on Internet has unique network address Understand each IP address has two parts

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  1. F O C U S FOCUS CISCO

  2. IP Addressing & The Binary System A Cisco Networking Presentation By Joe Reed

  3. Basic Goals for Addressing • Understand why IP addresses are necessary • Understand each network on Internet has unique network address • Understand each IP address has two parts • Understand classes of network addresses C11

  4. and a host number Review of IP Addressing Format Addresses are 32 Bits Long Made up of a network number C11 Referred to as Dotted Decimal Notation

  5. Why are IP addresses necessary? • Makes it possible for data passing through the Internet to findits destination. • There are more of them (4 billion) • Provides a betterway to organize computer addresses than MAC addresses • IP addresses may be set in software and are thus flexible C11

  6. How do IP addresses work? • Each network connected to the Internet has a unique network number. • InterNIC, assigns companies blocks of IP addresses based on the size of their networks C11

  7. How do IP addresses incorporate network addresses? • Every IP Address has two parts: • Network Number - identifies the network to which a device is attached • Host Number - identifies a device's connection to that network • One, two, or three octects may be used to identify the network & the host numbers C11

  8. I S D s What are the different classes of networks? Class “A” Networks - World Governments Class “B” Networks - Medium Size Companies Class “C” Networks - The rest of us... C11

  9. What are the IP Addresses of the different classes? C11

  10. What type of IP addressing does a class “A” network use? 124.95.44.15 C11

  11. What type of IP addressing does a class “A” network use? 0-127 C11

  12. What type of IP addressing does a class “B” network use? 151.10.13.28 C11

  13. What type of IP addressing does a class “B” network use? 0-127 128-191 0-255 C11

  14. What type of IP addressing does a class “C” network use? 201.110.213.28 C11

  15. What type of IP addressing does a class “C” network use? 192-223 0-255 0-255 C11

  16. REMEMBER... C11

  17. REMEMBER... C11

  18. REMEMBER... C11

  19. ESC18 How many classes of Networks are there? • There are three classes of networks that can be assigned by the InterNIC. In actuality, there are five classes of networks. • Only three of these are used commercially. • “A” • “B” • “C” • The other two are reserved.

  20. How are IP addresses reserved? C12

  21. Network and Broadcast Addresses C12

  22. Class “B” Network Addressing 176.10.0.0

  23. Reserving IP Addresses for Broadcasting Data Data Data

  24. How do external and internal views of networks differ? ? ? ? ? ? ? ? C12

  25. How do external and internal views of networks differ? C12

  26. Who assigns network addresses? • As with the host number portion of class "A," class "B," and class "C” addresses, subnet addresses are assigned locally. • Usually this is done by the network administrator. • Like other IP addresses, each subnet address is unique.

  27. What is included in a subnet address? Analogy: Subnets are similar to the American telephone number system . C12

  28. How are subnet addresses created? C12

  29. Concealing subnet addresses from outside networks. • Subnets are concealed from outside networks by using a mask. • These are referred to as subnet masks. • The function of a subnet mask is to tell devices which part of an address is the network number including the subnet, and which part is the host

  30. Review • IP addresses are used to identify a machine on a network and the network to which it is attached. (T/F) • True! • Each network connected to the Internet has a unique network number. (T/F) • True! • The network portion of every IP address is assigned by the local network administrator. (T/F) • False!

  31. Review • In a class "A" network using an IP addressing scheme, the first 16 bits are used for the network part of the address, and the last two octets are reserved for the host part of the address.(T/F) • False! • IP addresses are assigned by the NIC card manufacturer. (T/F) • False!

  32. Review • All class “C” networks have the same network number. (T/F) • False! • In a class “A” network the first 8 bits are used for the network part of the address. (T/F) • True! • The host portion of every IP address is assigned by the local network administrator. • True!

  33. Review • A network portion of the following address, 109.43.211.40, shows it to be what class of network? • A • A network portion of the following address, 220.43.211.40, shows it to be what class of network? • C

  34. Review • In a class “C” address only the last octect is usable by the local administrator. (T/F) • True! • Each network connected to the Internet has the same network number. (T/F) • False! • In a class “B” address only the middle 2 octects are usable by the local administrator. (T/F) • False!

  35. IP Addressing & The Binary System The End!

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