Why does NFS use UDP by default?

I'm sure there's some ancient legacy reason for it, but what is it? It seems like a service that's geared towards reliable data delivery.

Solution

NFS was originally designed to be used on a LAN where loss rates are very low.
UDP is faster, and has less overhead
NFS is stateless, so it's simple for clients to retry

Note that NFS v3+ can use TCP.

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