CLASSLESS INTERDOMAIN ROUTING CIDR SUBNETTING JONATHAN BENNETT NATHAN
CLASSLESS INTER-DOMAIN ROUTING {CIDR} & SUBNETTING JONATHAN BENNETT NATHAN GRAMMES PHILLIP LAFLEUR
STEP 1: CONNECT A BUNCH OF COMPUTERS STEP 2: DEVELOP ADDRESS SYSTEM Internet Protocol (IP) Address 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
19211000000. 10101000. 00000101. 10000010. 168. 5. 130 BIT CONVERTER 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
11000000. 10101000. 00000101. 10000010 Octet 32 Bits 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
STEP 1: CONNECT A BUNCH OF COMPUTERS STEP 2: DEVELOP ADDRESS SYSTEM Internet Protocol (IP) Address STEP 3: ASSIGN IP ADDRESSES ? 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
The CLASSFUL NETWORK (ABRIDGED) Assigned based on 3 classes, A B C , representing available hosts 254 65 THOUSAND 17 MILLION What if you only need 3, 000? CCCCCC Cluttered routing table. B Waste 62, 000+ addresses! 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
The CLASSFUL NETWORK (ABRIDGED) 70. 1. 0. 0 70. 2. 0. 0 70. 3. 0. 0 70. 4. 0. 0 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
70. 5. 0. 0 70. 6. 0. 0 70. 7. 0. 0 70. 8. 0. 0 70. 9. 0. 0 70. 10. 0. 0 70. 11. 0. 0 70. 12. 0. 0 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
Available IP’s exhausted after 254 assignments of Class B. PROBLEM 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
INTERNET ENGINEERING TASK FORCE 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
The SOLUTION (UNABRIDGED) SUBNETTING Let’s just divide our network into MANAGABLE bits. 192. 168. 5. 130 IP ADDRESS NETWORK 192. 168. 5 PREFIX HOST 0. 0. 0. 130 NUMBER 255. 0 SUBNET HOST 0. 0. 0. 130 NUMBER 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
The SOLUTION (UNABRIDGED) SUBNETTING Let’s just divide our network into MANAGABLE bits. 192. 168. 5. 130 255. 0 192. 168. 5. 0 0. 0. 0. 130 Designates network prefix 255 = Entire Octet (0 – 254) or (in binary) Leading 1 s and trailing 0 s 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
The SOLUTION (UNABRIDGED) SUBNETTING Network prefix and host suffix can be found with binary operation AND. 1 AND 0 = 0 1 AND 1 = 1 11000000. 10101000. 00000101. 10000010 IP Address 11111111. 0000 Subnet Mask 11000000. 10101000. 00000101. 0000 Network Prefix 00000000. 10000010 Host Number 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
The SOLUTION (UNABRIDGED) CIDR+SUBNETTING CIDR represents the notation in which subnetting is represented. IP / INITIAL BITS 192. 168. 5. 130 / 24 11000000. 10101000. 00000101. 10000010 192. 168 . 5 . 130 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
The SOLUTION (UNABRIDGED) 70. 1. 0. 0 / 23 01000110. 00000001. 00000000 510 Hosts 70. 1. 0. 0 – 70. 1. 1. 254 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
The SOLUTION (UNABRIDGED) 70. 1. 0. 0 / 22 01000110. 00000001. 00000000 1020 Hosts 70. 1. 0. 0 – 70. 1. 3. 254 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
The SOLUTION (UNABRIDGED) 70. 1. 0. 0 / 21 01000110. 00000001. 00000000 2046 Hosts 70. 1. 0. 0 – 70. 1. 7. 254 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
The SOLUTION (UNABRIDGED) IMPLICATIONS 70. 1. 15. 0 / 22 70. 1. 16. 0 / 12 70. 0 70. 1. 16. 0 / 15 70. 1. 12. 0 / 16 1993 CLASSLESS INTER-DOMAIN ROUTING AND SUBNETTING
IP ‘division’ via subnetting allows for specific distribution of IPs AWESOME 1981 CLASSFUL NETWORK ADDRESSING ARCHITECTURE
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