Level 11
Level 12

## Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

Ignore?
five
IP version 4 (IPv4) defines __ address classes.
host, interface
Unicast addresses identify a single __ or __ so that the address uniquely identifies the device.
1–126
Class A
128–191
Class B
192–223
Class C
224–239
Class D
240–255
Class E
Class A
Unicast (large networks)
Class B
Unicast (medium-sized networks)
Class C
Unicast (small networks)
Class D
Multicast
Class E
Experimental
1.0.0.0 – 126.0.0.0
Valid network numbers for Class A:
128.0.0.0 – 191.255.0.0
Valid network numbers for Class B:
192.0.0.0 – 223.255.255.0
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:
network part
The addresses in the same network have the same values in the __.
host part
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.
255.0.0.0
255.255.0.0
255.255.255.0
11111111, 00000000
Decimal 255 converts to the binary value __ Decimal 0, converted to 8-bit binary, is __.
2^N
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 __.
Each classful network has four key numbers that describe the network:
lowest number
The network number is the numerically __ in the network.
one larger
The first (numerically lowest) host IP address is __ than the network number.
The TCP/IP RFCs define a __ as a special address in each network.
A __ is always the highest (last) number in the network.
one less
If you can find the __ and __, finding the first and last usable IP addresses in the network is easy.
first octet
 Determine the class (A, B, or C) based on the __.
class
 Mentally divide the network and host octets based on the __.
host octets
 To find the network number, change the IP address’s __ to 0.
fourth octet of the network ID
255
 To find the broadcast address, change the network ID’s host octets to __.
subtract 1
0, 127
For Class A, the first odd fact is that the range of values in the first octet omits the numbers __ and __.
reserved
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 __.
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).
128.0.0.0
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.
128.0
The first octet is 128, making it a Class B network with a two-octet network part (__).
191.255.0.0
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