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.
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
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)- A5% (3)
- B10% (6)
- C81% (47)
- D3% (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.
A large number of connections overwhelming a server, causing slowdowns, is a strong indicator of malicious activity rather than common, legitimate traffic.
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.
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.
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
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