Netpractice 42 Tutorial Info

You will often see IPs written like 192.168.1.1/24. The /24 indicates how many bits are set to 1 in the mask.

Tricky ones:

Example:
Left host: 192.168.1.10/24 gateway 192.168.1.1
Right host: 192.168.2.10/24 gateway 192.168.2.1

Scenario: Two routers connected directly – only 2 usable IPs. netpractice 42 tutorial

Recommended mask: /30 (255.255.255.252)

| Network | Mask | Usable IPs | |---------|------|------------| | 10.0.0.0/30 | 255.255.255.252 | .1 and .2 |

Example:

✅ Always use /30 for point-to-point links unless specified otherwise.

Scenario: Two different subnets connected via a router. Client must reach a server.

Key: Client needs a gateway (router’s interface IP on its own subnet). You will often see IPs written like 192

Example:

✅ Ensure each device's gateway is inside its own subnet and matches router’s IP.

Example:
A: 192.168.0.1/24
B: 192.168.0.2/24 Tricky ones:

Between two routers, you almost always see a /30 subnet mask.
Example: 10.0.0.0/30

NetPractice will not give you a calculator. You need to do binary math in your head or on paper. Here is the 5-minute crash course.