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This page is a general FAQ that should answer most of the common questions about the Nintendo Switch.
You can't at the moment. The Switch is a fairly new device and it will be some time before any vulnerabilities are exploited and released.
Make sure your Switch only connects to a router that you can block connections or DNS resolution on, through use of a hosts file or similar.
Block the following servers:
atumn.hac.lp1.d4c.nintendo.net atum.hac.lp1.d4c.nintendo.net receive-lp1.dg.srv.nintendo.net receive-lp1.er.srv.nintendo.net
Some services may be disabled, but you can continue using the ReSwitched tools such as PegaSwitched.