CIDR and address planning
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
plan IP address space so nothing overlaps now or later.
Planned topics
- CIDR notation like 10.20.0.0/16 gives a network prefix; the number after the slash is how many bits are fixed, so a smaller number means a bigger block.
- Private ranges (RFC 1918) are reserved for internal use: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.
- Overlapping ranges cannot be peered or routed together; fixing it later means re-addressing.
- Plan one master allocation: per environment, per region, per store, plus the data center, with growth headroom.
- Some services reserve addresses in each subnet; leave margin (verify before recording).
Draft outline details
Demonstration
an address plan table: block, owner, purpose, size, example 10.10.0.0/16 for prod region A.
Check your understanding
Which is larger, a /16 or a /24?
Show answer
A /16; fewer fixed bits means more addresses.
Practice
Apply this lesson with the module's lab, exercises and quiz.
Marking a lesson complete is optional and you can undo it any time. Your progress stays in this browser.