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101 · Question #197

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 clientside connection and the serverside. A standard virtual server on F5 BIG-IP performs destination NAT by default but not source NAT, so the client IP is always preserved on the server-side connection.

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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 clientside connection and the serverside
  • BThe server IP address is unchanged between the clientside connection and the serverside
  • CThe TCP ports used in the clientside 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

(22 responses)
  • A
    82% (18)
  • B
    5% (1)
  • C
    9% (2)
  • D
    5% (1)

Why each option

A standard virtual server on F5 BIG-IP performs destination NAT by default but not source NAT, so the client IP is always preserved on the server-side connection.

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

By default, a standard virtual server translates only the destination IP address from the VIP to a pool member IP via destination NAT (DNAT), leaving the client source IP address completely unchanged on the server-side connection. No SNAT is applied unless explicitly configured, so the server always sees the original client IP.

BThe server IP address is unchanged between the clientside connection and the serverside

The destination IP always changes from the virtual server's VIP address to the selected pool member's IP address through DNAT, so the server IP is never the same on both sides.

CThe TCP ports used in the clientside connection are the same as the TCP ports serverside

The destination port is typically preserved but is not guaranteed to match in all configurations; additionally, this choice is a narrower claim that does not hold 'always true' across all default standard virtual server setups.

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

The destination IP address always differs between client-side and server-side because DNAT is always performed, translating the VIP to a pool member address.

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

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

Topics

#virtual server#client IP address#SNAT#connection processing

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