Advanced Spanning Tree Protocols (MSTP/VSTP) JN0-650 Practice Questions (Page 5)

Questions 21–24

1. 21application · medium

   A network administrator wants to implement per-VLAN load balancing across two links between two switches. The network has 10 VLANs, and the administrator wants each link to carry half of the VLANs. Which spanning tree protocol is best suited for this requirement?

   • ARSTP, because it provides fast convergence and can load-balance VLANs automatically.
   • BVSTP, because it runs a separate spanning tree instance per VLAN, allowing different VLANs to use different links.
   • CMSTP, because it groups VLANs into instances, but it cannot load-balance across links.
   • DSTP, because it is the most stable and supports per-VLAN load balancing.
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   What is a common symptom of a VLAN-to-instance mapping inconsistency in an MSTP network?

   • AAll VLANs are blocked on the same port.
   • BThe switch stops learning MAC addresses.
   • CThe switch continuously reboots.
   • DSome VLANs are not forwarding traffic even though the port is up.
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A small network has 5 VLANs and two switches connected by two links. The administrator wants to use VSTP to load-balance the VLANs across the links. What is the primary advantage of VSTP over MSTP in this scenario?

   • AVSTP uses fewer resources than MSTP because it does not require region configuration.
   • BVSTP is more compatible with legacy switches than MSTP.
   • CVSTP converges faster than MSTP because it uses fewer BPDUs.
   • DVSTP provides per-VLAN load balancing, allowing each VLAN to use a different link independently.
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5. 24expert · hard

   A company has two data centers connected by a dark fiber link. Each data center runs MSTP with the same region name 'DC' and revision 5. However, Data Center 1 maps VLANs 100-200 to instance 1, while Data Center 2 maps VLANs 100-200 to instance 2. The engineer observes that VLAN 150 is blocked on the dark fiber link. What is the most effective fix?

   • AAdd VLAN 150 to instance 0 on both data centers to ensure it is carried by the IST.
   • BChange the revision number to 0 on both data centers to force them into the same region.
   • CReconfigure Data Center 2 to map VLANs 100-200 to instance 1, matching Data Center 1.
   • DEnable VSTP on the dark fiber link to allow per-VLAN forwarding.
   Reveal Solution Discussion Select an answer first