201 · Question #172
A BIG-IP Administrator defines a device Self IP . The Self IP is NOT reachable from the network. What should the BIG-IP Administrator verify first?
The correct answer is B. The correct VLAN has been selected. If a Self IP is unreachable from the network, the primary verification step should be confirming its association with the correct VLAN, as VLANs define the broadcast domain for Self IPs.
Question
A BIG-IP Administrator defines a device Self IP . The Self IP is NOT reachable from the network. What should the BIG-IP Administrator verify first?
Options
- AThe correct interface has been selected.
- BThe correct VLAN has been selected.
- CVerify if auto last hop is disabled.
- DThe correct Trunk has been selected.
How the community answered
(37 responses)- A14% (5)
- B78% (29)
- C3% (1)
- D5% (2)
Why each option
If a Self IP is unreachable from the network, the primary verification step should be confirming its association with the correct VLAN, as VLANs define the broadcast domain for Self IPs.
While an interface is part of the path, the Self IP is fundamentally tied to the VLAN, which then uses the interface; checking the interface first before the VLAN is less direct.
A Self IP is directly associated with a specific VLAN, which defines the Layer 2 broadcast domain it belongs to; if the wrong VLAN is selected, the Self IP will not be on the expected network segment and thus unreachable.
Auto Last Hop affects how return traffic is sent from the BIG-IP, not the initial reachability of the Self IP itself from the network.
A trunk bundles interfaces for VLANs, but the Self IP's direct association is with the VLAN itself, not directly with the trunk.
Concept tested: BIG-IP Self IP and VLAN association
Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-network-management/managing-self-ip-addresses.html
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