300-445 Question 217
Select 2Your organization has deployed a network monitoring solution to track key metrics and ensure optimal performance. You are tasked with configuring alert rules to proactively identify network issues. One of the requirements is to detect high latency and packet loss in a site-to-site VPN connection. Additionally, you need to monitor for any anomalies in BGP routing table states that could indicate route flapping. Which combination of alert rules should you configure to meet these requirements?
- A
Create a rule to alert on excessive TCP retransmissions observed over the VPN connection.
- B
Configure an alert to trigger when the VPN latency exceeds a defined threshold.
- C
Set up a rule to monitor the error counters for the site-to-site VPN interface.
- D
Enable an alert based on significant changes in the BGP routing table size or frequent route withdrawals.
- E
Configure an alert to monitor the throughput of the VPN connection.
Show answer and explanation
Correct answers: B, D
Explanation
To meet the requirements, you need to configure alert rules that directly address high latency and packet loss in the VPN connection, as well as BGP routing table anomalies. Configuring latency threshold alerts ensures that VPN performance issues are detected, while monitoring BGP routing table changes identifies potential route flapping or instability. TCP retransmissions, error counters, and throughput monitoring are useful for other network issues but do not specifically address the requirements outlined in the scenario.
- A. Incorrect.
While excessive TCP retransmissions can indicate network issues, it is not a direct metric for monitoring latency or packet loss in a site-to-site VPN. This option does not fully address the requirements.
- B. Correct.
Latency thresholds are a direct method for detecting high delays in a VPN connection, making this an appropriate alert rule to configure.
- C. Incorrect.
Monitoring error counters can help identify hardware or interface issues but does not directly address the requirement to detect high latency or packet loss.
- D. Correct.
Changes in the BGP routing table, such as frequent route withdrawals or significant size changes, can indicate route flapping or instability, which aligns with the requirements.
- E. Incorrect.
Monitoring throughput is useful for bandwidth utilization but is not directly related to detecting latency, packet loss, or BGP anomalies.