201 · Question #287
Assume a BIG-IP has no NATs or SNATs configured. Which two scenarios are possible when client traffic arrives on a BIG-IP that is NOT destined to a self-IP? (Choose two.)
The correct answer is A. If the destination of the traffic does not match a virtual server, the traffic will be discarded. C. If the destination of the traffic matches a virtual server, the traffic will be processed per the virtual. This question clarifies the default behavior of an F5 BIG-IP system when client traffic arrives, without NAT/SNAT configured, based on whether it matches a virtual server.
Question
Assume a BIG-IP has no NATs or SNATs configured. Which two scenarios are possible when client traffic arrives on a BIG-IP that is NOT destined to a self-IP? (Choose two.)
Options
- AIf the destination of the traffic does not match a virtual server, the traffic will be discarded.
- BIf the destination of the traffic does not match a virtual server, the traffic will be forwarded based on
- CIf the destination of the traffic matches a virtual server, the traffic will be processed per the virtual
- DIf the destination of the traffic matches a virtual server, the traffic will be forwarded, but it cannot be
How the community answered
(19 responses)- A79% (15)
- B5% (1)
- D16% (3)
Why each option
This question clarifies the default behavior of an F5 BIG-IP system when client traffic arrives, without NAT/SNAT configured, based on whether it matches a virtual server.
If incoming client traffic is not addressed to a self-IP and does not match any configured virtual server, the BIG-IP system will discard the traffic by default, as there is no specific instruction for its processing.
Without a matching virtual server or self-IP, and in the absence of explicit forwarding rules, the BIG-IP will not forward the traffic based on routing, but instead, it will discard the unmatched traffic.
If incoming client traffic, not destined for a self-IP, successfully matches a configured virtual server, the BIG-IP will then process that traffic according to the virtual server's specific configuration, including load balancing and any associated profiles or iRules.
If client traffic matches a virtual server, it will be processed and directed according to that virtual server's configuration, which includes the capability to load balance and forward to a backend server, even without explicit NAT or SNAT if the network path supports it.
Concept tested: F5 BIG-IP default traffic handling and virtual server matching
Source: https://techdocs.f5.com/en-us/big-ip-ltm-networks-and-system-management-15-1-0/packet-flow-across-the-big-ip-system/packet-flow-through-a-standard-virtual-server.html
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