Server Name Indication
A TLS extension transmitting the server name during connection establishment. It helps select a certificate on shared addresses and is not a DNS record.
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Glossary
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Clear filtersSplit-horizon DNS
DNS returning different data according to query source or view. Useful internally, it complicates diagnosis and configuration consistency.
Definition and sourcesSubdomain
A name below another in the DNS hierarchy, such as blog.example.com under example.com. It may have separate delegation or services and is not a website folder.
Definition and sources