300-445 Question 144
Select 4Your organization has deployed a network assurance solution to monitor and ensure the performance of business-critical web applications. During the monitoring, your team notices intermittent slowdowns in page load times for a customer-facing web portal. To diagnose the issue, which of the following actions would help identify the root cause effectively?
- A
Analyze HTTP response codes to check for server-side errors.
- B
Examine end-to-end network latency metrics for the web traffic flows.
- C
Inspect DNS resolution times for the web portal’s domain.
- D
Configure a firewall rule to block traffic from external web users temporarily.
- E
Monitor SSL/TLS handshake duration to identify encryption-related delays.
Show answer and explanation
Correct answers: A, B, C, E
Explanation
Web application performance issues can originate from multiple layers, including server-side processing, network latency, DNS resolution, or encryption overheads. By analyzing HTTP response codes, network latency, DNS resolution times, and SSL/TLS handshake duration, you can gather comprehensive insights into potential bottlenecks without disrupting the service. Blocking traffic, on the other hand, is not a valid diagnostic approach for this scenario.
- A. Correct.
Analyzing HTTP response codes can indicate whether server-side errors (e.g., 500-series errors) are contributing to the slowdowns.
- B. Correct.
Examining end-to-end network latency metrics is crucial for identifying delays in packet delivery that might affect web application performance.
- C. Correct.
DNS resolution times can reveal if domain name lookups are contributing to the observed slowdowns.
- D. Incorrect.
Blocking traffic from external users is not a diagnostic action and could disrupt service for legitimate users, making it counterproductive.
- E. Correct.
Monitoring SSL/TLS handshake duration can help identify if encryption-related delays are impacting the web application's performance.