Differences between version 7 and predecessor to the previous major change of ClasslessInterDomainRouting.
Other diffs: Previous Revision, Previous Author, or view the Annotated Edit History
| Newer page: | version 7 | Last edited on Tuesday, August 19, 2003 6:10:44 pm | by JamieCurtis | Revert |
| Older page: | version 4 | Last edited on Tuesday, August 12, 2003 12:10:17 pm | by DanielLawson | Revert |
@@ -6,15 +6,15 @@
|<110|Class C|2^21 networks of 256 hosts each|/24|>192.0.0.0 - 223.255.255.255
|<1110|Class D|2^28 multicast ID's| |>224.0.0.0 - 239.255.255.255
|<11110|Class E|2^27 Reserved addresses| |>240.0.0.0 - 247.255.255.255
-There was a lot of use of Class C networks since a lot of people had about 250 odd machines, and a lot of people using Class B addresses, however not many people required more than that. Now half the address space was "Wasted" reserved for "A" spaces and B and C spaces were running out fast. So the idea was to stop using the class bits and store the network information independently.
+There was a lot of use of Class C networks since a lot of people had about 250 odd machines, and a lot of people needed more than 250 machines, but less than 65530ish machines and they ended up
using Class B addresses, however not many people required more than that. Now half the address space was "Wasted" reserved for "A" spaces and B and C spaces were running out fast. So the idea was to stop using the class bits and store the network information independently. This also let them give out ranges larger than a /24 (254 usable addresses), but smaller than a /16 (65534 useable addresses)
-Many large organisations have (or used to have) class A networks assigned to them - a couple of quick examples are many universities (eg StanfordUniversity) and some car manufacturers (eg BMW?
- reserved a class A in expectation that all their cars would eventually have a unique IP address).
+Many large organisations have (or used to have) class A networks assigned to them - a couple of quick examples are many universities (eg StanfordUniversity) and some car manufacturers (eg Ford
- reserved a class A in expectation that all their cars would eventually have a unique IP address).
-The notation commonly called "CIDR notation" is to suffix / and the number of bits that form the network. For example, the "10.1.1.1" Class A address would be shown as "10.1.1.1/8". The idea is that any length of bits from 1 to 32 can be used after "/". Its fairly unlikely you'll ever see anything greater than a /8 however.
+The notation commonly called "[
CIDR]
notation" is to suffix / and the number of bits that form the network. For example, the "10.1.1.1" Class A address would be shown as "10.1.1.1/8". The idea is that any length of bits from 1 to 32 can be used after "/". Its fairly unlikely you'll ever see anything greater than a /8 however.
-The introduction of CIDR meant that RouteAggregation could be implemented effectively.
+The introduction of [
CIDR]
meant that RouteAggregation could be implemented effectively.
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Part of CategoryNetworking
