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101 · Question #17

A virtual server is defined per the charts. The last five client connections were to members C, D, A, B, B . Given the conditions shown in the above graphic, if a client with IP address 205.12.45.52 o

The correct answer is D. 172.16.20.4:80. This question tests knowledge of F5 BIG-IP pool load balancing and connection routing based on a member rotation sequence defined by the pool's configured method.

Section 3: Load Balancing and High Availability Basics

Question

A virtual server is defined per the charts. The last five client connections were to members C, D, A, B, B . Given the conditions shown in the above graphic, if a client with IP address 205.12.45.52 opens a connection to the virtual server, which member will be used for the connection.

Exhibit

101 question #17 exhibit

Options

  • A172.16.20.1:80
  • B172.16.20.2:80
  • C172.16.20.3:80
  • D172.16.20.4:80
  • E172.16.20.5:80

How the community answered

(26 responses)
  • A
    12% (3)
  • B
    4% (1)
  • C
    4% (1)
  • D
    81% (21)

Why each option

This question tests knowledge of F5 BIG-IP pool load balancing and connection routing based on a member rotation sequence defined by the pool's configured method.

A172.16.20.1:80

Member A (172.16.20.1:80) was used two rotations ago and does not appear next in the current active member sequence.

B172.16.20.2:80

Member B (172.16.20.2:80) already received the last two consecutive connections and would not be selected again before other eligible members are used.

C172.16.20.3:80

Member C (172.16.20.3:80) was used earlier in the sequence and is not the next member due in the active rotation.

D172.16.20.4:80Correct

Based on the pool configuration shown in the graphic (likely Round Robin with member E marked unavailable or disabled), after the five connections to C, D, A, B, B, the active rotation cycles back to D (172.16.20.4:80) as the next eligible member. The repeated connection to B indicates E was skipped due to being unavailable, and the resulting effective rotation of the four active members places D next in sequence.

E172.16.20.5:80

Member E (172.16.20.5:80) is likely disabled or marked down per the graphic, which is why B received two consecutive connections instead of E receiving one.

Concept tested: F5 BIG-IP pool member load balancing rotation

Source: https://techdocs.f5.com/en-us/bigip-16-1-0/big-ip-local-traffic-management-getting-started-with-local-traffic-management/big-ip-local-traffic-management-getting-started-with-local-traffic-management/load-balancing-decisions.html

Topics

#round robin#load balancing#pool members#connection distribution

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