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Exam 400-007 topic 1 question 166 discussion

Actual exam question from Cisco's 400-007
Question #: 166
Topic #: 1
[All 400-007 Questions]

Two routers R1 and R2 are directly connected through an Ethernet link. Both routers are running OSPF over the Ethernet link and OSPF has been registered with BFD. R1 has been set up to transmit BFD at a 50 ms interval, but R2 can receive only at a 100 ms rate due to platform limitations. What does this mean?

  • A. After the initial timer exchange, R2 sets its transmission rate to the R1 Desired Min TX interval
  • B. After the initial timer exchange, R1 sets its transmission rate to the R2 Required Min RX interval
  • C. Timers renegotiate indefinitely, so the timer exchange phase never converges
  • D. R2 sets the P-bit on all BFD control packets until R2 sends a packet with the F-bit set
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Suggested Answer: B 🗳️
by bdp123 at May 16, 2023, 8:58 p.m.

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J_W
5 months, 3 weeks ago
Selected Answer: B
During the BFD session establishment, the routers exchange timer values: Desired Min TX interval and Required Min RX interval. The Desired Min TX interval indicates the desired transmission rate from the local router (R1 in this case), while the Required Min RX interval indicates the required reception rate on the remote router (R2 in this case). In the given scenario, R1 will adjust its transmission rate to match the Required Min RX interval of R2, which is 100 ms. This ensures that R2 can receive BFD packets at its maximum capability without being overwhelmed by a higher transmission rate from R1.
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bdp123
6 months, 1 week ago
Selected Answer: B
Each system, upon receiving a BFD control packet will take the "Required Min RX Interval" and compare it to its own "Desired Min TX Interval" and take the greater (slower) of the two values and use it as the transmission rate for its BFD packets. Thus, the slower of the two systems determines the transmission rate. https://www.cisco.com/en/US/technologies/tk648/tk365/tk480/technologies_white_paper0900aecd80244005.html
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