nerdexam
Cisco

200-201 · Question #241

Refer to the exhibit. An engineer received a ticket about a slowed-down web application. The engineer runs the #netstat - an command. How must the engineer interpret the results?

The correct answer is C. The web application server is under a denial-of-service attack.. The netstat -an output showing a massive number of connections, particularly in a SYN_RECV state or from many diverse source IPs to the web server's port 80/443, strongly indicates a denial-of-service attack overwhelming the server.

Submitted by omar99· Mar 6, 2026Host-Based Analysis

Question

Refer to the exhibit. An engineer received a ticket about a slowed-down web application. The engineer runs the #netstat - an command. How must the engineer interpret the results?

Exhibit

200-201 question #241 exhibit

Options

  • AThe web application is receiving a common, legitimate traffic
  • BThe engineer must gather more data.
  • CThe web application server is under a denial-of-service attack.
  • DThe server is under a man-in-the-middle attack between the web application and its database

How the community answered

(58 responses)
  • A
    5% (3)
  • B
    10% (6)
  • C
    81% (47)
  • D
    3% (2)

Why each option

The `netstat -an` output showing a massive number of connections, particularly in a SYN_RECV state or from many diverse source IPs to the web server's port 80/443, strongly indicates a denial-of-service attack overwhelming the server.

AThe web application is receiving a common, legitimate traffic

A large number of connections overwhelming a server, causing slowdowns, is a strong indicator of malicious activity rather than common, legitimate traffic.

BThe engineer must gather more data.

While gathering more data is generally useful, the `netstat -an` output with numerous connections or specific connection states is a direct diagnostic indicator of a DoS attack.

CThe web application server is under a denial-of-service attack.Correct

A web application server experiencing a denial-of-service (DoS) attack will typically show a high number of half-open connections (SYN_RECV state) or an excessive number of established connections from various sources. These connections consume system resources, leading to the reported slowdowns and preventing legitimate users from accessing the application.

DThe server is under a man-in-the-middle attack between the web application and its database

A man-in-the-middle attack involves intercepting traffic between two parties, which would not typically manifest as an overwhelming number of connections *to* the web server itself in a `netstat -an` output.

Concept tested: Interpreting `netstat` for DoS attacks

Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/description-of-netstat-command-line-utility

Topics

#netstat#denial-of-service#DoS attack#network troubleshooting

Community Discussion

No community discussion yet for this question.

Full 200-201 Practice