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IP version 4 (IPv4) defines __ address classes.
Unicast addresses identify a single __ or __ so that the address uniquely identifies the device.
Unicast (large networks)
Unicast (medium-sized networks)
Unicast (small networks)
18.104.22.168 – 22.214.171.124
Valid network numbers for Class A:
126.96.36.199 – 188.8.131.52
Valid network numbers for Class B:
192.0.0.0 – 184.108.40.206
Valid network numbers for Class C:
2^7 – 2 = 126
Total networks for Class A:
2^14 = 16,384
Total networks for Class B:
2^21 = 2,097,152
Total networks for Class C:
The addresses in the same network have the same values in the __.
The addresses in the same network have different values in the __.
Each network class has an associated __ that defines the size of the network and host parts of an unsubnetted Class A, B, and C network.
Default Mask for Class A:
Default Mask for Class B:
Default Mask for Class C:
Decimal 255 converts to the binary value __ Decimal 0, converted to 8-bit binary, is __.
With 2 bits, you can make four combinations: 00, 01, 10, and 11. As it turns out, the total combination of unique values you can make with N bits is __.
Network number, First usable address, last usable address, Network broadcast address
Each classful network has four key numbers that describe the network:
The network number is the numerically __ in the network.
The first (numerically lowest) host IP address is __ than the network number.
network broadcast address
The TCP/IP RFCs define a __ as a special address in each network.
network broadcast address
A __ is always the highest (last) number in the network.
The highest (last) number usable as an IP address is the address that is simply __ than the network broadcast address.
network number, network broadcast address
If you can find the __ and __, finding the first and last usable IP addresses in the network is easy.
 Determine the class (A, B, or C) based on the __.
 Mentally divide the network and host octets based on the __.
 To find the network number, change the IP address’s __ to 0.
fourth octet of the network ID
 To find the first address, add 1 to the __.
 To find the broadcast address, change the network ID’s host octets to __.
 To find the last address, __ from the fourth octet of the network broadcast address.
For Class A, the first odd fact is that the range of values in the first octet omits the numbers __ and __.
What would be Class A network 0.0.0.0 was originally __ for some broadcasting requirements, so all addresses that begin with 0 in the first octet are __.
software testing, loopback address
What would be Class A network 127.0.0.0 is still reserved because of a special address used in __, called the __ (127.0.0.1).
However, even the very first (lowest number) Class B network number (__) looks a little like a Class A network number, because it ends with three 0s.
The first octet is 128, making it a Class B network with a two-octet network part (__).
For another Class B example, the high end of the Class B range also might look strange at first glance (__), but this is indeed the numerically highest of the valid Class B network numbers.
Class A, Class B
This network’s broadcast address, 220.127.116.11, might look a little like a __ broadcast address because of the three 255s at the end, but it is indeed the broadcast address of a __ network.
128 to 191
Other valid Class B network IDs that look unusual include 18.104.22.168, 22.214.171.124, 126.96.36.199, and 188.8.131.52. All of these follow the convention of a value from __ in the first octet.
Class C network __ looks a little like a Class A network because of the last three octets being 0, but because it is a Class C network, it consists of all addresses that begin with three octets equal to ***.0.0.
Other valid __ network IDs that look unusual include 184.108.40.206, 220.127.116.11, 18.104.22.168, and 22.214.171.124.