Advanced Spanning Tree Protocols (MSTP/VSTP) JN0-650 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   In MSTP, which instance is always present and used for inter-region communication?

   • AInstance 1, which is the highest-priority instance.
   • BThe VLAN instance, which is created automatically for each VLAN.
   • CThe Common Spanning Tree (CST), which is a separate protocol instance.
   • DInstance 0, also known as the Internal Spanning Tree (IST).
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   What is the primary characteristic of VLAN Spanning Tree Protocol (VSTP)?

   • AIt runs a separate spanning tree instance for each VLAN.
   • BIt runs a single spanning tree instance for all VLANs.
   • CIt groups multiple VLANs into a few instances to reduce overhead.
   • DIt uses a single instance but with faster convergence than RSTP.
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4. 18application · medium

   A network engineer is designing a new campus network with 20 VLANs and wants to use MSTP to reduce the number of spanning tree instances compared to VSTP. The engineer plans to map VLANs 1-10 to instance 1 and VLANs 11-20 to instance 2. What is the primary benefit of this design over VSTP?

   • AMSTP allows VLANs to be in different regions, which VSTP cannot do.
   • BMSTP automatically load-balances across all links without manual configuration.
   • CMSTP provides faster convergence than VSTP because it uses fewer BPDUs.
   • DMSTP reduces CPU and memory overhead by running only two instances instead of 20.
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5. 19foundation · easy

   What happens when a VSTP switch connects to a switch running classic STP?

   • AThe VSTP switch runs a separate instance for each VLAN, and the STP switch runs a single instance, causing a conflict.
   • BThe VSTP switch sends a single BPDU for all VLANs to the STP switch, which treats it as a regular STP BPDU.
   • CThe STP switch cannot understand VSTP BPDUs and will block the port.
   • DThe VSTP switch automatically disables VSTP and runs STP on that interface.
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6. 20foundation · easy

   What is the role of the Internal Spanning Tree (IST) in MSTP?

   • AIt is a separate spanning tree instance for each VLAN, used to load-balance traffic.
   • BIt is a backup instance that activates only when the primary instance fails.
   • CIt provides a loop-free path for inter-region communication and acts as a common spanning tree for the entire network.
   • DIt is used only within a single region to prevent loops among access switches.
   Reveal Solution Discussion Select an answer first