1.7 Classfull Subnetting
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How many network bits does Class A have?
8 network bits (255.0.0.0).
What are the leading bits for class A?
0-127.
What what the network bits for Class B?
16 network bits (255.255.0.0).
What are the leading bits for Class B?
128-191.
What are the network bits for Class C?
24 network bits (255.255.255.0).
What are the leading bits for Class C?
192-223.
What are the leading bits for Class D (multicast)?
224-239.
What are the leading bits for Class E (reserved).
240-255.
How do you find the network address?
Set all host bits to 0.
How do you find the first usable host address?
One number higher than the network address.
How do you find the network broadcast address?
Set all host bits to 1.
What is the last usable host address?
One number lower than the broadcast address.
Note 
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