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Use of either NetBIOS or LLMNR services on Windows is essentially automatic, since using standard DNS client APIs will result in the use of either NetBIOS or LLMNR depending on what name is being resolved (whether the name is a local name or not), the network configuration in effect (e.g. DNS suffixes in effect) and (in corporate networks) the policies in effect (whether LLMNR or NetBIOS are disabled), although developers may opt into bypassing these services for individual address lookups.
The mDNS and LLMNR protocols have minor differences in their approach to name resolution. mDNS allows a network device to choose a ___domain name in the [[.local|local]] DNS [[namespace]] and announce it using a special multicast IP address. This introduces special semantics for the [[top-level ___domain name|top-level ___domain]] ''local'',<ref>{{Citation | publisher = IETF | type = electronic mail message | url = http://www1.ietf.org/mail-archive/web/ietf/current/msg37126.html | title = Re: Last Call: 'Linklocal Multicast Name Resolution (LLMNR)' to Proposed Standard | access-date = 2006-02-10 | archive-url = https://web.archive.org/web/20081207202354/http://www.ietf.org/mail-archive/web/ietf/current/msg37126.html | archive-date = 2008-12-07 | url-status = dead }}</ref> which is considered a problem by some members of the IETF.<ref>{{Citation | publisher = IETF | type = electronic mail message | url = http://www1.ietf.org/mail-archive/web/ietf/current/msg37773.html | title = Re: Summary of the LLMNR Last Call | access-date = 2006-02-10 | archive-url = https://web.archive.org/web/20081207202402/http://www.ietf.org/mail-archive/web/ietf/current/msg37773.html | archive-date = 2008-12-07 | url-status = dead }}</ref> The current LLMNR draft allows a network device to choose any ___domain name, which is considered a security risk by some members of the IETF.<ref>{{Citation | publisher = IETF | type = electronic mail message | url = http://www1.ietf.org/mail-archive/web/ietf/current/msg37740.html | title = Summary of the LLMNR Last Call | access-date = 2005-11-11 | archive-url = https://web.archive.org/web/20081207202357/http://www.ietf.org/mail-archive/web/ietf/current/msg37740.html | archive-date = 2008-12-07 | url-status = dead }}</ref> mDNS is compatible with DNS-SD as described in the next section, while LLMNR is not.<ref>{{Citation | publisher = IETF | type = electronic mail message | url = http://www.mhonarc.org/archive/html/ietf/2005-08/msg00494.html | title = More details on the differences}}</ref>
==Service discovery==
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