Binary Lesson 5.5 Usable Addresses Class A, B, and C

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Presentation transcript:

Binary Lesson 5.5 Usable Addresses Class A, B, and C

Slash Notation Consider a class A address of 1.2.3.4 The network portion is the first octet 1 This situation can be written 1.2.3.4/8 The number after the / is the number of bits in the network portion 2

Subnet Mask Consider a class A address of 1.2.3.4 /8 in binary The subnet mask is 255.0.0.0 The network address is 1.0.0.0 In Binary: IP: 00000001 00000010 00000011 00000100 Subnt Msk: 11111111 00000000 00000000 00000000 Net Addr: 00000001 00000000 00000000 00000000 3

Network Address To find the network address, take a node's IP address and set all the host bits to 0 IP: 00000001 00000010 00000011 00000100 Subnt Msk: 11111111 00000000 00000000 00000000 NNNNNNNN HHHHHHHH HHHHHHHH HHHHHHHH Net Addr: 00000001 00000000 00000000 00000000 In decimal: IP: 1 2 3 0 Subnt Msk: 255 0 0 0 Net Addr: 1 0 0 0 4

Broadcast Address To find the broadcast address, take a node's IP address and set all the host bits to 1 IP: 00000001 00000010 00000011 00000100 Subnt Msk: 11111111 00000000 00000000 00000000 NNNNNNNN HHHHHHHH HHHHHHHH HHHHHHHH Brdc Addr: 00000001 11111111 11111111 11111111 In decimal: IP: 1 2 3 0 Subnt Msk: 255 0 0 0 Brdc Addr: 1 255 255 255 5

Usable Addresses All the other addresses are usable--starting at network address + 1 and ending at broadcast address -1 Network Addr: 1. 0. 0. 0 Subnet Mask: 255. 0. 0. 0 Broadcast Addr: 1.255.255.255 First Usable Addr: 1. 0. 0. 1 Last Usable Addr: 1.255.255.254 6

Class B Class B address: 147.144.1.212 /16 The subnet mask is 255.255.0.0 The network address is 147.144.0.0 The broadcast address is 147.144.255.255 In Binary: IP: 10010011 10010000 00000001 11010100 Subnt Msk: 11111111 11111111 00000000 00000000 Net Addr: 10010011 10010000 00000000 00000000 Brdc Addr: 10010011 10010000 11111111 11111111 7

Class B Usable Addresses Class B address: 147.144.1.212 /16 The subnet mask is 255.255.0.0 The network address is 147.144.0.0 The broadcast address is 147.144.255.255 First usable address: 147.144.0.1 Last usable address: 147.144.255.254 8

Class C Class C address: 192.168.1.10 /24 The subnet mask is 255.255.255.0 The network address is 192.168.1.0 The broadcast address is 192.168.1.255 In Binary: IP: 11000000 10101000 00000001 00001010 Subnt Msk: 11111111 11111111 11111111 00000000 Net Addr: 11000000 10101000 00000001 00000000 Brdc Addr: 11000000 10101000 00000001 11111111 9