Exam 400-007 topic 1 question 27 discussion

d

here the explanation and the special keyword hold-queue If you increase the interface input queue depth (with the hold-queue in command) it helps reduce the number of dropped TCP ACKs, which reduces the amount of work BGP must do to converge. Normally, a value of 1000 resolves problems caused by input queue drops. Answer D

If the emphasis is on the management of BGP update messages and TCP acknowledgments, especially if the router is managing numerous or large update messages, option B might be particularly relevant. This would involve understanding how buffer management can impact the device’s ability to handle high volumes of data and acknowledgment messages during BGP convergence. If the emphasis is on packet processing and ensuring that data is not dropped during periods of high load, option D might be relevant, focusing on ensuring that packets have somewhere to "wait" if the device is temporarily unable to process them.

The hold queue is a buffer that holds packets temporarily when the device's processing capacity is overwhelmed. In the given situation, the route reflector is experiencing delays during large network changes, indicating that it is struggling to handle the TCP acknowledgments during route updates. This suggests that the hold queue may be filling up quickly, causing congestion and delays in processing the acknowledgments. By increasing the size of the hold queue, the router can accommodate a larger number of packets in the queue, reducing the likelihood of congestion and improving performance during route updates. This allows the router to handle a higher volume of TCP acknowledgments and facilitates faster convergence.