201 · Question #175
when they connect to /resources/201.1.2h.l_l.com they are unable to receive content. What is the likely cause of the issue?
The correct answer is B. The virtual address does not have ARP enabled. If clients cannot connect to a virtual address, a common cause is that ARP is not enabled on the virtual address, preventing the BIG-IP from responding to Layer 2 address resolution requests.
Question
when they connect to /resources/201.1.2h.l_l.com they are unable to receive content. What is the likely cause of the issue?
Exhibit
Options
- AThe pool associated with the virtual server does not have priority group activation enabled.
- BThe virtual address does not have ARP enabled.
- CThe virtual address does not have route advertising enabled.
- DThe pool associated with the virtual server is falling its health check.
How the community answered
(50 responses)- A14% (7)
- B74% (37)
- C4% (2)
- D8% (4)
Why each option
If clients cannot connect to a virtual address, a common cause is that ARP is not enabled on the virtual address, preventing the BIG-IP from responding to Layer 2 address resolution requests.
Priority group activation affects how traffic is distributed among pool members, not the reachability of the virtual server itself.
If ARP is not enabled on a virtual address, the BIG-IP will not respond to ARP requests for that IP, meaning clients on the same broadcast domain cannot resolve the virtual IP to a MAC address and thus cannot establish a connection.
Route advertising is relevant for dynamic routing protocols to inform routers about the virtual IP, but ARP is a more fundamental Layer 2 issue for direct client connectivity.
If the pool is failing its health check, the virtual server would still be reachable, but connections would typically be reset or rejected, rather than an inability to connect to the virtual address itself.
Concept tested: BIG-IP Virtual Address ARP configuration
Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-local-traffic-management-concepts/virtual-addresses.html
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