How does a new node get all the previous blocks in a blockchain?

How does a new node get all the previous blocks in a blockchain?

From what I understand, when a new full node is started, it begins by fetching all the previous blocks in the blockchain from it's peers.

I want to know how exactly it does that? Does it ask for a local copy of the blockchain from other peers and save it? In case multiple peers have different chains, how does it resolve?

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