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201 · Question #71

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…

The correct answer is A. The client IP address is unchanged between the client side connection and the serverside connection. By default, a standard virtual server, acting as a full proxy, replaces the destination IP address with the pool member's IP while preserving the client's source IP address in the server-side connection.

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

How the community answered

(48 responses)
  • A
    94% (45)
  • B
    4% (2)
  • C
    2% (1)

Why each option

By default, a standard virtual server, acting as a full proxy, replaces the destination IP address with the pool member's IP while preserving the client's source IP address in the server-side connection.

AThe client IP address is unchanged between the client side connection and the serverside connection.Correct

With a standard virtual server acting as a full proxy and default SNAT (Secure Network Address Translation) disabled or set to 'auto map', the source IP address of the server-side connection will be the client's original IP, allowing backend servers to see the actual client IP.

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

The server IP address changes from the virtual server's IP address (on the client side) to the chosen pool member's IP address (on the server side).

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

While often the same, the TCP ports can be changed by the virtual server (e.g., port translation), so this is not always true by default.

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

This statement is incorrect because the destination IP address (from client to VS) is the virtual server's IP, while the destination IP address (from VS to server) is the pool member's IP.

Concept tested: F5 BIG-IP standard virtual server default behavior

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-local-traffic-manager-concepts/about-virtual-servers.html

Topics

#virtual server#standard virtual server#IP address translation#client-side#server-side

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