F5
101 · Question #116
101 Question #116: Real Exam Question with Answer & Explanation
The correct answer is C: iw.mysite.com. IN CNAME wwip.mysite.com.. To delegate a hostname to an F5 GTM WideIP, the upstream DNS server should use a CNAME record pointing the name to the WideIP name on the GTM.
Question
A site wishes to delegate the name .wmysite.com to a GTM System. Which entry would be appropriate in their current DNS servers?
Options
- Avww.mysite.com. IN A 132.26.33.15
- B15.33.addrin.arpa.com IN PRT .wiw.mysite.com.
- Ciw.mysite.com. IN CNAME wwip.mysite.com.
- Dwwmysite.com. IN DEL wiwGTM.mysite.com.
Explanation
To delegate a hostname to an F5 GTM WideIP, the upstream DNS server should use a CNAME record pointing the name to the WideIP name on the GTM.
Common mistakes.
- A. An A record maps a hostname directly to a static IP address and does not delegate resolution authority to the GTM System.
- B. A PTR record is used for reverse DNS lookups mapping an IP address back to a hostname, which is not applicable for forward name delegation.
- D. DEL is not a valid DNS record type - no such record type exists in the DNS standard, making this option syntactically invalid.
Concept tested. F5 GTM WideIP CNAME delegation from upstream DNS
Reference. https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-gtm-implementations.html
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