F5
101 · Question #115
101 Question #115: Real Exam Question with Answer & Explanation
The correct answer is A: It comes from BIND database (zone) files on the GTM System.. When a GTM System is authoritative for a domain and receives a query for a non-WideIP name, it resolves the name using its local BIND zone files.
Question
A GTM System performs a name resolution that is not a WideIP. The name is in a domain for which the GTM System is authoritative. Where does the information come from?
Options
- AIt comes from BIND database (zone) files on the GTM System.
- BGTM System cannot resolve a host name that is not a WideIP.
- CIt comes from the database of previously cached name resolutions.
- DIt comes from a zone transfer initiated when the request was received.
Explanation
When a GTM System is authoritative for a domain and receives a query for a non-WideIP name, it resolves the name using its local BIND zone files.
Common mistakes.
- B. GTM can resolve any name within its authoritative zones - not only WideIPs - because non-WideIP records are served from the BIND zone files it hosts.
- C. Cached resolutions apply to recursive or non-authoritative lookups, not to names for which the GTM itself holds authoritative zone data.
- D. Zone transfers replicate zone data between servers and are not triggered per query - the local zone files already contain the authoritative answer.
Concept tested. F5 GTM BIND zone file authoritative resolution
Reference. https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-dns-implementations.html
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