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Exam 300-101 topic 2 question 504 discussion

Actual exam question from Cisco's 300-101
Question #: 504
Topic #: 2
[All 300-101 Questions]

Your network has a mixture of Fast Ethernet and Gigabit Ethernet links. What needs to be done to ensure optimal data routing when using OSPF?

  • A. Nothing. OSPF will determine the most optimal path for routing data by default.
  • B. Adjust the hello and dead timers for more rapid detection of link failures.
  • C. Increase the reference-bandwidth used to calculate the interface default metrics, on all routers in your network.
  • D. Set the priority values on every broadcast interface to ensure that the designated and backup designated routers are the routers with the most processor and
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Suggested Answer: memory resources. 🗳️
Explanation -
The default formula to calculate the cost for the OSPF metric is (10 /BW). Therefore when using default reference bandwidth (100M) to calculate ospf, Gi and Fa interfaces could have the same cost (1). This problem can be fixed by configuring reference bandwidth to 1000M.

This is how to configure reference bandwidth to 1000Mbps:

Router(config)#router ospf 1 -
Router(config-router)#auto-cost reference-bandwidth 1000

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Nemanja
5 years, 2 months ago
C. Increase the reference-bandwidth used to calculate the interface default metrics, on all routers in your network.
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