networking class a b c quiz

What are classes D & E used for?

• Class D addresses are used for multicasting. • Class E addresses are reserved for testing & some mysterious future use.

How many total IP addresses are Class A?

• Half of all IP addresses are Class A addresses.

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What are the values for class A?

0 - 127

What are the 2 rules that govern the value of an address?

1. A host address cannot be designated by all zeros or all ones. 2. These are special addresses that are reserved for special purposes.

What are the values for class B?

128 - 191

What are the values for class C?

192 - 223

What are the values for class D?

224 - 239

What are the values for class E?

240 - 255

What is the largest decimal number that can be stored in an IP address octet?

255

IP addresses are divided into how many classes?

5 - Class A, Class B, Class C, Class D, Class E

What are some examples of what class an address is, based off the beginning number?

An address beginning with 120 is a Class A address, 155 is a Class B address & 220 is a Class C address.

What bits does a Class A address use to designate the network address?

Class A IP addresses use the 1st 8 bits (1st Octet) to designate the Network address.

What bits does a Class B address use to designate the network address?

Class B addresses use the 1st 16 bits (two octets) for the Network address.

What bits does a Class C address use to designate the network address?

Class C addresses use the 1st 24 bits (three octets) for the Network address & only the last octet for Host addresses.

In a Class B network, what is the difference between the 1st 2 bits and the remaining 14 bits?

The 1st 2 bit, which are always 10, designate the address as a Class B address & 14 bits are used to designate the Network. This leaves 16 bits (two octets) to designate the Hosts.

In a Class C network, what is the difference between the 1st 3 bits and the remaining 21 bits?

The 1st 3 bits of all class C addresses are set to 110, leaving 21 bits for the Network address, which means there can be 2,097,150 (2^21 - 2) Class C Networks, but only 254 (2^8 - 2) Hosts per Network.

In a Class A network, what is the difference between the 1st bit and the remaining 7 bits?

The 1st bit which is always a 0, is used to indicate the address as a Class A address & the remaining 7 bits are used to designate the Network.

What is an Octet?

The 32-bit IP address is broken up into 4 octets, which are arranged into a dotted-decimal notation scheme. Example of an IP version 4: 172.64.126.52

What do the 3 remaining octets in a network address do?

The other 3 octets contain the Host address.

How many Class A network addresses are there?

There are 128 Class A Network Addresses, but because addresses with all zeros aren't used & address 127 is a special purpose address, 126 Class A Networks are available.

How many host addresses are available in a Class A Address?

There are 16,777,214 Host addresses available in a Class A address. -- following formula to compute the number of hosts available in any of the class addresses, where "n" represents the number of bits in the host portion: (2n - 2) = Number of available hosts

How do you break down the number 124 (typically 100 + 20 + 4)?

To the computer, this number is 1111100, which is 64 (2^6) + 32 (2^5) + 16 (2^4) + 8 (2^3) + 4 (2^2) + 0 + 0

How many Class B networks can there be?

Using our formula, (2^14 - 2), there can be 16,382 Class B Networks & each Network can have (2^16 - 2) Hosts, or 65,534 Hosts.