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5.5.2 Known IP Address and Ethernet Address

5.5.2 Known IP Address and Ethernet Address. Transmit from B => F (B knows F’s IP Address). 5.5.3 Unknown IP Address . Transmit from B => F (B doesn’t know F’s IP address). DNS Request. DNS Response. 5.5.4 Unknown Ethernet Address.

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5.5.2 Known IP Address and Ethernet Address

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  1. 5.5.2 Known IP Address and Ethernet Address • Transmit from B => F (B knows F’s IP Address)

  2. 5.5.3 Unknown IP Address • Transmit from B => F (B doesn’t know F’s IP address) DNS Request DNS Response

  3. 5.5.4 Unknown Ethernet Address • Transmit from B => F (doesn’t know F’s Ethernet address)

  4. IP Subnetting Practice • 192.168.1.0/22 • Based on needing 5 subnets, answer the following: • Bits used for subnetting (borrowed bits) = 3 • Total # of Subnets* = 2^n = 2^3 = 8 subnets • Bits available for Hosts = 10 – 3 = 7 • Total # of Hosts per Subnet** = 2^n – 2 = 2^7 – 2 = 126 • Notes Since this IP has a CIDR of /22, this means that we can use the remaining 10 bits (32-22=10) to create our subnets. • * n is equal to the number of bits used for subnetting • ** n is equal to the remaining bits & minus 2 accounts for broadcast and network addresses

  5. IP Subnetting Practice • 192.168.1.0/27 • Based on needing 3 subnets, answer the following: • Bits used for subnetting (borrowed bits) = 2 bits for subnets • Total # of Subnets* = 2^n = 2^2 = 4 subnets • Bits available for Hosts = 5 – 2 = 3 bit left • Total # of Hosts per Subnet** = 2^n – 2 = 2^3 – 2 = 6 hosts • Notes Since this IP has a CIDR of /27, this means that we can use the remaining 5 bits (32-27=5) to create our subnets. • * n is equal to the number of bits used for subnetting • ** n is equal to the remaining bits & minus 2 accounts for broadcast and network addresses

  6. IP Subnetting Practice • 192.168.1.15/24 • What is the network address? 192.168.1.0 (since this is /24 the first 24 bits will be the network address) • What is the subnet mask for this address? • To do this, put a 1 in each of the first 24 bits so: • 11111111 . 11111111 . 11111111 . 00000000 • 255 . 255 . 255 . 0

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