Refer to the exhibit.
 
All ports are members of VLAN 10. Considering the default cost of upstream bridges to the root bridge is equal, which option will be the new root port for VLAN
10?

A. interface f0/13

B. interface f0/14

C. interface f0/15

D. interface f0/21








 

Suggested Answer: D

Root Port election on each bridge
✑ Total Path Cost to root - lowest prevails (local Root Port cost added upon receipt of Configuration  PDUs on that port, from the direction of Root Bridge)
✑ Connected Bridge ID - lowest prevails
✑ Connected Port ID (Port Priority + Port#) - lowest prevail
✑ Local Port ID - lowest prevails
In this case, fa0/21 has the lowest cost, so it will be the root port.
Reference: https://community.extremenetworks.com/extreme/topics/802_1d_spanning_tree_election_rules

This question is in 300-115 Implementing Cisco IP Switched Networks (SWITCH) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate





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