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201 · Question #333

A standard virtual server has been associated with a pool with multiple members. Assuming all other settings are left at their defaults, which statement is always true concerning traffic processed by

The correct answer is A. The client IP address is unchanged between the client side connection and the serverside. When a standard virtual server processes traffic with default settings, the client's original IP address is typically preserved for the server-side connection to the pool member.

Section 2: Configure Load Balancing Features

Question

A standard virtual server has been associated with a pool with multiple members. Assuming all other settings are left at their defaults, which statement is always true concerning traffic processed by the virtual server?

Options

  • AThe client IP address is unchanged between the client side connection and the serverside
  • BThe server IP address is unchanged between the client side connection and the serverside
  • CThe TCP ports used in the client side connection are the same as the TCP ports serverside
  • DThe IP addresses used in the clientside connection are the same as the IP addresses used in the

How the community answered

(50 responses)
  • A
    92% (46)
  • B
    2% (1)
  • C
    4% (2)
  • D
    2% (1)

Why each option

When a standard virtual server processes traffic with default settings, the client's original IP address is typically preserved for the server-side connection to the pool member.

AThe client IP address is unchanged between the client side connection and the serversideCorrect

By default, a standard virtual server acts as a full proxy. In configurations where Source Network Address Translation (SNAT) is not explicitly enabled or set to automap, the virtual server establishes a new connection to the backend server using the original client IP address as the source, thus preserving it from the client-side to the server-side connection. This allows backend servers to log the true client IP without additional configuration like X-Forwarded-For headers.

BThe server IP address is unchanged between the client side connection and the serverside

The server IP address on the client-side is the Virtual Server IP (VIP), but on the server-side, the connection is made to the specific pool member's IP, which is different from the VIP.

CThe TCP ports used in the client side connection are the same as the TCP ports serverside

The TCP source port used in the server-side connection is typically an ephemeral port chosen by the load balancer, which may not be the same as the client-side source port.

DThe IP addresses used in the clientside connection are the same as the IP addresses used in the

The destination IP on the client-side is the Virtual Server IP, while the destination IP on the server-side is the specific pool member's IP; therefore, the IP addresses are not the same.

Concept tested: Virtual Server default client IP preservation

Source: https://techdocs.f5.com/en-us/bigip-15-0-0/big-ip-local-traffic-management-concepts/standard-virtual-servers.html

Topics

#standard virtual server#IP address translation#default behavior

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