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201 · Question #5

A virtual server is defined using a sourceaddress based persistence profile. The last five connections were A, B, C, A, C . Given the conditions shown in the graphic, if a client with IP address…

The correct answer is B. 10.10.20.2:80. Source address persistence ensures that subsequent connections from the same client IP address are directed to the same pool member, bypassing standard load balancing for established sessions.

Configure Load Balancing Features

Question

A virtual server is defined using a sourceaddress based persistence profile. The last five connections were A, B, C, A, C . Given the conditions shown in the 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

201 question #5 exhibit

Options

  • A10.10.20.1:80
  • B10.10.20.2:80
  • C10.10.20.3:80
  • D10.10.20.4:80
  • E10.10.20.5:80

How the community answered

(25 responses)
  • A
    12% (3)
  • B
    56% (14)
  • C
    4% (1)
  • D
    8% (2)
  • E
    20% (5)

Why each option

Source address persistence ensures that subsequent connections from the same client IP address are directed to the same pool member, bypassing standard load balancing for established sessions.

A10.10.20.1:80

This pool member would be chosen only if the persistence entry for 205.12.45.52 pointed to it, or if the client was new and load balancing picked it, which contradicts the given correct answer for persistence.

B10.10.20.2:80Correct

With a source address persistence profile, the system maintains a record of which pool member previously served a specific client IP address. If the client 205.12.45.52 has a current persistence entry, the virtual server will direct this new connection to 10.10.20.2:80 as dictated by that persistence record.

C10.10.20.3:80

This pool member would be chosen only if the persistence entry for 205.12.45.52 pointed to it, or if the client was new and load balancing picked it, which contradicts the given correct answer for persistence.

D10.10.20.4:80

This pool member would be chosen only if the persistence entry for 205.12.45.52 pointed to it, or if the client was new and load balancing picked it, which contradicts the given correct answer for persistence.

E10.10.20.5:80

This pool member would be chosen only if the persistence entry for 205.12.45.52 pointed to it, or if the client was new and load balancing picked it, which contradicts the given correct answer for persistence.

Concept tested: Source address persistence in load balancing

Source: https://techdocs.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-concepts-11-2-0/ltm-persistence-profiles.html

Topics

#source-address persistence#virtual server#pool members#connection affinity

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