# IP-Adressierung
## Adressierung im L3
  - Hierarchisch

### Subnetting
Mögliche Zahlen in Subnetzmasken:


| Wert (dezimal) | Wert (Hexadezimal) |              Wert (Binär)               | Alternative Schreibweise | Anzahl adressierbarer Interfaces |
| :------------: | :----------------: | :-------------------------------------: | ------------------------ | :------------------------------: |
| 255.255.255.0  |     0xFFFFFF00     | 1111'1111'1111'1111'1111'1111'0000'0000 | /24                      |            $256 - 2$             |
| 255.255.254.0  |     0xFFFFFE00     | 1111'1111'1111'1111'1111'1110'0000'0000 | /23                      |            $512 - 2$             |
| 255.255.252.0  |     0xFFFFFC00     | 1111'1111'1111'1111'1111'1100'0000'0000 | /22                      |            $1024 - 2$            |
| 255.255.248.0  |     0xFFFFF800     | 1111'1111'1111'1111'1111'1000'0000'0000 | /21                      |            $2048 - 2$            |
| 255.255.240.0  |     0xFFFFF000     | 1111'1111'1111'1111'1111'0000'0000'0000 | /20                      |            $4096 - 2$            |
| 255.255.224.0  |     0xFFFFE000     | 1111'1111'1111'1111'1110'0000'0000'0000 | /19                      |            $8192 - 2$            |
| 255.255.192.0  |     0xFFFFC000     | 1111'1111'1111'1111'1100'0000'0000'0000 | /18                      |           $16384 - 2$            |
| 255.255.128.0  |     0xFFFF8000     | 1111'1111'1111'1111'1000'0000'0000'0000 | /17                      |           $32768 - 2$            |
|  255.255.0.0   |     0xFFFF0000     | 1111'1111'1111'1111'0000'0000'0000'0000 | /16                      |           $65536 - 2$            |

## Routing
## IP-Adressen/Header
## ARP, Kapselung
## Fragmentierung