A backup method for resolving names on the local subnet when DNS lookups fail. Because replies can be faked, organisations often switch it off through Group Policy.
Also called Link-Local Multicast Name Resolution.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains LLMNR in context, with comparison tables and the common traps.
Terms in this definition
- backup method
Three schemes exist: forward incremental, forever forward incremental and reverse incremental. The one chosen fixes which files make up a chain and their sequence, and so how heavily and in what way the repository is read and written.
- LSDOU
The sequence in which Group Policy is processed: the local policy first, followed by site, domain and organisational unit policies. The nearest, last-processed setting takes effect unless Enforced or Block Inheritance alters that.
- Subnet
A segment of a VNet's address space from which resources receive private IPs. Azure holds back five addresses per subnet (the first four and the last), leaving 251 usable in a /24 and three in a /29, the smallest IPv4 subnet.
- DNS
The system that turns names into addresses. In Azure, private endpoints depend on private DNS zones, which are queried through 168.63.129.16.
- SWITCH
Checks one expression against several candidate values, returning whichever result pairs with the match (or a fallback otherwise). Writing SWITCH ( TRUE (), ... ) avoids nested IF chains: whichever condition is first true wins.
- Exclusions
Scopes taken out of a policy assignment; they can only narrow its coverage, never widen it.