Refer to the exhibit.
The exhibit shows the topology for a network with 30 access layer switches (only two are shown).
Every switch-to-switch link is a Gigabit link. Every virtual local area network (VLAN) interface runs
Open Shortest Path First (OSPF) and has the IP address shows in the exhibit. The interface
settings are at the defaults.
The access layer switches support more VLANs not shown in the exhibit and also run Multiple
Spanning Tree Protocol (MSTP) as a protection against loops.
What is one recommendation for enhancing convergence time and resiliency for this solution?
A.
Add a BPDU filter to the VLAN interfaces shown in the exhibit
B.
Lower the cost of the VLAN interfaces to reflect the high speed of the links
C.
Place all the switch-to-switch links in the same VLAN
D.
Raise the OSPF timers on the VLAN interfaces
B
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B
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yes right B
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correct A. according to exam prep guide
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Answer:A
On routing switches, you also need to consider how the routed links interact with MSTP, which you might enable for loop protection even if you are using routing.
Examine the figure below. The VLANs with VLAN ID 1XX (100-148) represent subnets 10.1.0.XX/30. Each interface represents a unique broadcast domain, so it cannot introduce a loop. However, MSTP does not take the VLANs actually assigned to a link into account when creating trees. Therefore, depending on the topology, it might try to shut down a redundant routed link. Enabling a BPDU filter
on the point-to-point subnets represented by the VLAN prevents this from happening
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