OSPF - OSPF Database Exchange - Requesting, Getting, and Acknowledging LSAs

3 important questions on OSPF - OSPF Database Exchange - Requesting, Getting, and Acknowledging LSAs

What kind of packet do the routers use the request one or more LSA's from its neighbor?

LSR (Link state Request)
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What kind of packet do the routers use to respond to a LSR and what does it consist?

LSU (Link-state Update)

One or more full LSAs.
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What methods can be used to acknowledge an LSU?

-Repeating same LSU
-Send back an LSAck (contains list of ack LSA headers).
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