# LSA Types

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The OSPF LSDB is made up of LSAs.

There are 11 types of LSA, but there are only 3 you should be aware of for the CCNA:

1. Type 1 (Router LSA)
2. Type 2 (Network LSA)
3. Type 5 (AS External LSA)

## Type 1

* Every OSPF router generated this type of LSA.
* It identifies the router using its router ID.
* It also lists networks attached to the router's OSPF-activated interfaces.

## Type 2

* Generated by the DR of each 'multi-access' network (ie. the **broadcast** network type).
* Lists the routers which are attached to the multi-access network.

## Type 5

* Generated by ASBRs to describe routes to destinations outside of the AS (OSPF domain).

<figure><img src="https://1474932522-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAgItg4KAZpnXjAFPWRf8%2Fuploads%2FJkqenKVfYcqpJ89SN6UZ%2FScreenshot%20from%202023-07-07%2016-27-39.png?alt=media&#x26;token=8437af70-beaa-4f20-bef6-43d542299f5a" alt=""><figcaption></figcaption></figure>
