F5
101 · Question #577
101 Question #577: Real Exam Question with Answer & Explanation
The correct answer is B: configure a tagged VLAN. When a new VLAN must share an existing physical interface on BIG-IP, the interface must be configured with 802.1Q VLAN tagging to carry traffic for multiple VLANs simultaneously.
Question
A new VLAN segment has been added to the network. Only the existing connected interface may be used. What should the BIG-IP Administrator do to allow traffic to both the existing and the new VLAN?
Options
- Aconfigure VLAN with Link Aggregation Control Protocols (LACP)
- Bconfigure a tagged VLAN
- Cconfigure an untagged VLAN
- Dconfigure VLAN to use interface with Multiple Spanning Tree Protocol (MSTP)
Explanation
When a new VLAN must share an existing physical interface on BIG-IP, the interface must be configured with 802.1Q VLAN tagging to carry traffic for multiple VLANs simultaneously.
Common mistakes.
- A. LACP (Link Aggregation Control Protocol) aggregates multiple physical interfaces into a single logical bundle for increased bandwidth or redundancy, but does not enable multiple VLANs to share one interface.
- C. An untagged VLAN assigns the interface to exactly one VLAN without inserting a frame tag, which means only a single VLAN can be active on that interface at a time.
- D. MSTP (Multiple Spanning Tree Protocol) is a loop-prevention protocol that maps VLANs to spanning tree instances, but it does not provide the frame-tagging mechanism needed to carry multiple VLANs over a single physical interface.
Concept tested. BIG-IP tagged VLAN 802.1Q configuration for multi-VLAN interface sharing
Reference. https://support.f5.com/csp/article/K7504
Community Discussion
No community discussion yet for this question.