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**Dynamic routing** is a routing method in which **routers automatically exchange routing information and build and update routes themselves**.

Put simply:
**routers negotiate among themselves how best to forward packets, without manually configuring every path**.

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## How dynamic routing works

1. Routers:
  - exchange service information
  - tell each other which networks they know about
2. Based on this information:
  - **routing tables** are built
  - the **best routes** are chosen
3. When the network changes:
  - a link fails
  - a new network appears
  routes **rebuild themselves automatically**

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## What makes this possible

Dynamic routing works thanks to:

- **routing protocols**
- path selection algorithms
- metrics (route cost)

Routers:

- evaluate routes
- compare them
- choose the optimal ones

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## Where dynamic routing is used

Dynamic routing is applied when:

- the network is **large**
- the topology **changes often**
- **fault tolerance** is required
- automatic control of paths is needed

Typical examples:

- corporate networks
- providers
- the Internet

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## Advantages of dynamic routing

- automatic adaptation to changes
- good scalability
- less manual work
- support for backup routes

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## Disadvantages of dynamic routing

Important for an interview

- extra service traffic
- more complex configuration
- load on CPU and memory
- potential security risks

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## Comparison with static routing (briefly)

- **Static**: simple, manual, no adaptation
- **Dynamic**: automatic, flexible, scalable

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