Refer to the exhibit. An engineer receives a P1 incident from an office that is experiencing issues with Microsoft Teams. What is the root cause of the issue?

Question

Options

• AAn HTTP handshake failed due to degraded network conditions.
• BA firewall is blocking the communication.
• CThe web application returned an error code.
• DThe TLS certificate on the server expired.

• A
  6% (3)
• B
  21% (11)
• C
  62% (33)
• D
  11% (6)

Explanation

Option C is correct because the exhibit (typically a packet capture or application log) shows the server successfully responding with an HTTP error status code (such as a 4xx or 5xx), meaning the TCP connection and TLS handshake both completed - traffic reached the application layer, and the Teams web service itself returned the error.

• A is wrong - degraded network conditions cause TCP timeouts, retransmissions, or handshake failures, not a clean HTTP error code response from the server.
• B is wrong - a blocking firewall would drop or reset the connection before any HTTP response could be returned; you'd see no response or a TCP RST, not an HTTP status code.
• D is wrong - an expired TLS certificate causes a TLS handshake failure (the connection dies before HTTP traffic flows), so no HTTP response code would appear in the capture.

Memory tip: Think of it as a progression - firewall blocks first, TLS handshakes second, HTTP runs third. If you see an HTTP error code, the first two layers worked fine, so the fault lives in the application itself (Layer 7).

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