Objective 1.14 Given a Scenario with a Specific Query Source IP Address and Various Pool and Wide IP Loading Balancing Methods and Topology Rules/regions Determine the Response That Will Be Given 302 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A DNS query arrives at a BIG-IP DNS system via a recursive resolver. The original client IP is 203.0.113.5, but the resolver's IP is 198.51.100.1. The BIG-IP DNS system is configured to use the original client IP. What IP address is used for topology matching?

   • A203.0.113.5, because the system is configured to use the original client IP
   • BNeither IP, because the system cannot determine the source
   • C198.51.100.1, because it is the resolver's IP
   • DBoth IPs, because the system uses both for matching
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   A DNS query arrives at a BIG-IP DNS system through a network where the client's actual IP address is 203.0.113.10. The query passes through a recursive resolver at 198.51.100.25, which forwards the query to the BIG-IP DNS. The BIG-IP DNS receives the query from the resolver's IP address. Which IP address does BIG-IP DNS use as the source IP for topology and load balancing decisions by default?

   • AThe IP address of the client's local DNS server if different from the resolver
   • B198.51.100.25
   • CThe IP address of the BIG-IP DNS self IP that received the query
   • D203.0.113.10
   Reveal Solution Discussion Select an answer first
4. 3expert · hard

   A Wide IP has three pools: PoolA, PoolB, and PoolC. A topology record matches 10.0.0.0/8 to PoolA. The Wide IP method is 'Round Robin'. A query arrives from source IP 10.1.1.1. PoolA is up, but PoolB is down. What is the response?

   • APoolB, because round robin selects the next pool
   • BPoolC, because PoolB is down
   • CNo response, because PoolB is down
   • DPoolA, because the topology record matches and the pool is up
   Reveal Solution Discussion Select an answer first
5. 4expert · hard

   A Wide IP uses 'Ratio' as the Wide IP method with PoolA ratio 2 and PoolB ratio 1. A topology record matches 10.0.0.0/8 to PoolB. A query arrives from source IP 10.1.1.1. What is the final response?

   • APoolB, because the topology record matches the source IP
   • BEither pool, because the ratio and topology conflict
   • CPoolA, because it has a higher ratio
   • DPoolB, because it has a lower ratio
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A Wide IP has two pools: PoolA (US) and PoolB (Europe). A topology record matches source IPs in the 198.51.100.0/24 range to PoolA. A query arrives from source IP 198.51.100.200. The Wide IP method is 'Round Robin'. What pool is selected?

   • AEither pool, because the topology record and round robin conflict
   • BPoolA, because the source IP is in the US range
   • CPoolA, because the topology record matches the source IP
   • DPoolB, because round robin alternates
   Reveal Solution Discussion Select an answer first