300-445 Question 220
Select 3You are a network administrator tasked with configuring alert rules to monitor network performance and detect potential issues. Your organization reports intermittent slowness in accessing critical services hosted over an MPLS VPN. Upon investigation, you suspect issues related to congestion and TCP retransmissions. Which alert rules should you configure to effectively monitor and troubleshoot this issue?
- A
Alert on high TCP retransmission rates
- B
Alert on increased MPLS Label Switched Path (LSP) latency
- C
Alert on changes in the state of the BGP routing table
- D
Alert on high error counters for network interfaces
- E
Alert on excessive SNMP polling intervals
Show answer and explanation
Correct answers: A, B, D
Explanation
To effectively monitor and troubleshoot intermittent slowness in accessing services over an MPLS VPN, you need to focus on metrics related to congestion, packet loss, and MPLS performance. High TCP retransmission rates, increased MPLS LSP latency, and high error counters on interfaces are all indicative of conditions that can degrade network performance. Configuring alerts for these metrics will help you identify and address the root cause of the issue.
- A. Correct.
High TCP retransmission rates often indicate network congestion or packet loss, which can lead to slowness in service delivery. Monitoring this is critical for diagnosing the issue.
- B. Correct.
Increased MPLS LSP latency can indicate congestion within the MPLS network, which might be contributing to the intermittent slowness experienced by the organization.
- C. Incorrect.
While changes in the BGP routing table can impact network performance, this is not directly related to the symptoms of intermittent slowness and TCP retransmissions in this scenario.
- D. Correct.
High error counters on network interfaces can indicate physical or link-layer issues, which may contribute to packet loss or retransmissions. This is relevant to the problem at hand.
- E. Incorrect.
Excessive SNMP polling intervals do not directly contribute to network performance issues or the symptoms described, making this irrelevant in this scenario.