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101 · Question #66

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. Applying the load balancing algorithm defined in the referenced graphic to the connection history (C, D, A, B, B), the next connection from 205.12.45.52 is assigned to pool member D at 172.16.20.4:80.

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.

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

(48 responses)
  • A
    13% (6)
  • B
    2% (1)
  • C
    4% (2)
  • D
    79% (38)
  • E
    2% (1)

Why each option

Applying the load balancing algorithm defined in the referenced graphic to the connection history (C, D, A, B, B), the next connection from 205.12.45.52 is assigned to pool member D at 172.16.20.4:80.

A172.16.20.1:80

172.16.20.1:80 is not selected because the load balancing algorithm, as applied to the prior connection history shown in the graphic, does not designate this member as the next recipient.

B172.16.20.2:80

172.16.20.2:80 received two of the last five connections, making it a lower priority candidate under least-connections or weighted round-robin methods that account for prior distribution.

C172.16.20.3:80

172.16.20.3:80 already appeared in the recent connection sequence and is not next in the rotation or selection order according to the configured algorithm.

D172.16.20.4:80Correct

Based on the pool configuration and load balancing algorithm shown in the graphic - such as round robin, ratio, or least connections - the connection history of C, D, A, B, B results in 172.16.20.4:80 being the next designated member. The load balancing method tracks which member is next in rotation or has the fewest active connections, and that calculation points to member D for this new client connection.

E172.16.20.5:80

172.16.20.5:80 is not selected because the algorithm's current state, as determined by the graphic and prior connection history, routes this connection to member D instead.

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

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-local-traffic-manager-concepts/load-balancing-decisions.html

Topics

#load balancing#round robin#pool members#least connections

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