CCNA 200-125 1.11: Describe the need for private IPv4 addressing (LAB)

Private IPs were originally meant for security because they are not routable over the internet, but they also came in handy as a means to save valuable public IP address space.  Without private IP addressing, we would not have anymore public IP addresses to hand out today to new devices. That’s really good considering IoT hasn’t even taken off yet.

Identify the private IP ranges

  • Class C: 192.168.0.0 - 192.168.255.255 (65,536 IP addresses)
  • Class B: 172.16.0.0 - 172.31.255.255 (1,048,576 IP addresses)
  • Class A: 10.0.0.0 - 10.255.255.255 (16,777,216 IP addresses)

 

PacketTracer Lab: CCNA-200-125-Lab-1.11

  • On Router0
    • Configure the first usable address in the first usable private class A network on Loopback0.  Use a classful subnet mask.
    • Configure the first usable address in the first usable private class B network on Loopback1.  Use a classful subnet mask.
    • Configure the first usable address in the first usable private class C network on Loopback2.  Use a classful subnet mask.
    • Verify each address is working by pinging them from Router0.
  • On Router1
    • Configure the first usable address in the last usable private class A network on Loopback0.  Use a classful subnet mask.
    • Configure the first usable address in the last usable private class B network on Loopback1.  Use a classful subnet mask.
    • Configure the first usable address in the last usable private class C network on Loopback2.  Use a classful subnet mask.
    • Verify each address is working by pinging them from Router1.

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