101 · Question #132
What is the purpose of the GTM Systems Address Exclusion List concerning local DNS servers?
The correct answer is A. to prevent probing of specific local DNSs. The GTM Address Exclusion List controls which local DNS server IP addresses the GTM system will skip when sending probes, preventing unnecessary or unwanted monitoring traffic to those servers.
Question
What is the purpose of the GTM Systems Address Exclusion List concerning local DNS servers?
Options
- Ato prevent probing of specific local DNSs
- Bto prevent name resolution to specific Virtual Servers
- Cto prevent name resolution for requests from specific local DNSs
- Dto prevent probing of any local DNS servers by specific F5 devices
How the community answered
(19 responses)- A95% (18)
- B5% (1)
Why each option
The GTM Address Exclusion List controls which local DNS server IP addresses the GTM system will skip when sending probes, preventing unnecessary or unwanted monitoring traffic to those servers.
The Address Exclusion List is specifically used to suppress GTM probing activity toward designated LDNS IP addresses, which prevents the GTM from sending probe packets to those servers when calculating topology-based or proximity-based load balancing decisions.
Restricting name resolution to specific virtual servers is controlled by pool membership and DNS policies, not the Address Exclusion List.
Blocking resolution for requests originating from specific LDNS clients is an ACL or topology record function, not the purpose of the exclusion list.
The exclusion list targets specific LDNS addresses to exclude from probing universally, not restricting which F5 devices may probe them.
Concept tested: F5 GTM LDNS probe exclusion configuration
Source: https://techdocs.f5.com/en-us/bigip-14-1-0/big-ip-dns-implementations/big-ip-dns-implementations.html
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