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IP Subnetting

IP Subnetting. Textbook: Networking Basics, CCNA 1 Companion Guide , Cisco Press Cisco Networking Academy Program, CCNA 1 and 2, Companion Guide , Cisco Press, Latest Edition. Brief Review. Rules? Terms Subnet Subnet Number Subnet Mask.

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IP Subnetting

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  1. IP Subnetting Textbook: Networking Basics, CCNA 1 Companion Guide, Cisco Press Cisco Networking Academy Program, CCNA 1 and 2, Companion Guide, Cisco Press, Latest Edition CIM 2465 IP Subnetting

  2. Brief Review • Rules? • Terms • Subnet • Subnet Number • Subnet Mask CIM 2465 IP Subnetting

  3. Determining the Number of Required Subnets and the Resulting Subnet Mask • To come up with a subnetting plan (subnetting scheme), the engineer must answer the following questions: • How many subnets are required for a particular network? • What is the largest number of hosts neededin the largest subnet? • How many subnet bits does the subnet mask need to support (at least) that many subnets? • How many host bits does the subnet mask need to support (at least) that many hosts per subnet? • What subnet mask(s) support(s) the required number of subnet and host bits? CIM 2465 IP Subnetting

  4. Number of Subnets and Hosts CIM 2465 IP Subnetting

  5. Number of Subnet and Host Bits CIM 2465 IP Subnetting

  6. How to find? • Number of required subnet bits (in mask) • Find the number s such that 2S – 2 >= the number of required subnets • Number of required host bits (in mask) • Find the number h such that 2h – 2 >= the number of required hosts CIM 2465 IP Subnetting

  7. Examples CIM 2465 IP Subnetting

  8. Determine the Mask CIM 2465 IP Subnetting

  9. Determine Subnet Numbers and Assignable IP Addresses in Each Subnet • Subnet number • The numerically lowest number in a subnet, represents a particular IP subnet • Subnet broadcast address • The highest numerical value in a subnet, for broadcast • Assignable IP address • IP addresses that may be assigned to an interface • Subnet zero (zero subnet) • The numerically smallest subnet number. With classful IP addressing, not be used • Broadcast subnet • The numerically largest subnet number, With classful IP addressing, not be used CIM 2465 IP Subnetting

  10. CIM 2465 IP Subnetting

  11. Case • Class C network: 192.168.9.0 • Mask: 255.255.255.224 CIM 2465 IP Subnetting

  12. Finding Subnets 11000000 10101000 00001001 000 00000 192.168.9.0* 11000000 10101000 00001001 001 00000 192.168.9.32 11000000 10101000 00001001 111 00000 192.168.9.224* CIM 2465 IP Subnetting

  13. Finding Subnet Broadcast Address 11000000 10101000 00001001 000 11111 192.168.9.31* 11000000 10101000 00001001 001 11111 192.168.9.63 11000000 10101000 00001001 111 11111 192.168.9.255* CIM 2465 IP Subnetting

  14. Range of Valid Addresses CIM 2465 IP Subnetting

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