101 · Question #116
A site wishes to delegate the name .wmysite.com to a GTM System. Which entry would be appropriate in their current DNS servers?
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.
How the community answered
(22 responses)- A9% (2)
- B5% (1)
- C82% (18)
- D5% (1)
Why each option
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.
An A record maps a hostname directly to a static IP address and does not delegate resolution authority to the GTM System.
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.
A CNAME record redirects resolution of the alias name to the canonical WideIP name managed by the GTM System. When a client queries the aliased name, the upstream DNS returns the CNAME pointing to the GTM WideIP, and the GTM then applies its load-balancing and health-check logic to return the appropriate IP address.
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
Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-gtm-implementations.html
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