| jdenisco | 0923a23 | 2018-08-29 13:19:43 -0400 | [diff] [blame] | 1 | .. _prefixes: |
| 2 | |
| 3 | Prefixes |
| 4 | ^^^^^^^^ |
| 5 | |
| 6 | Some nomenclature used to describe prefixes: |
| 7 | |
| 8 | * 1.1.1.1 This is an address since it has no associated mask |
| 9 | * 1.1.1.0/24 This is a prefix. |
| 10 | * 1.1.1.1/32 This is a host prefix (the mask length is the size of the address). |
| 11 | |
| 12 | Prefix A is more specific than B if its mask length is longer, and less specific if |
| 13 | the mask is shorter. For example, 1.1.1.0/28 is more specific than 1.1.1.0/24. A |
| 14 | less specific prefix that overlaps with a more specific is the **covering** prefix. |
| 15 | For example, 1.1.1.0/24 is the covering prefix for 1.1.1.0/28 and 1.1.1.0/28 is termed |
| 16 | the **covered** prefix. A covering prefix is therefore always less specific than its |
| 17 | covered prefixes. |