DNS Listeners - Order Of Operations Flashcards
1
Q
What is the order of precedence when BigIP DNS provides a response to a client?
A
1 GSLB (wide-ip)
2 GTM iRules
3 DNS Express
4 DNS Cache (DNS profile) - DNS response has been cached
5 Resolve Cache (DNS profile) - DNS response has not been cached
6 DNS Load Balancing
7 ZoneRunner (BIND)
2
Q
What is an F5 listener?
A
A listener is a specialized virtual server that passively checks for DNS packets on port 53 and the IP address you assign to the listener. When a DNS query is sent to the IP address of the listener, BIG-IP DNS either handles the request locally or forwards the request to the appropriate resource.
