# Task 7 - UDP Scans

## Task 7 <mark style="color:green;background-color:green;">Scan Types</mark> UDP Scans

### If a UDP port doesn't respond to an Nmap scan, what will it be marked as?

> Nmap refers to the port as being open|filtered

<details>

<summary>Reveal Flag <span data-gb-custom-inline data-tag="emoji" data-code="1f6a9">🚩</span></summary>

:triangular\_flag\_on\_post:`open|filtered`

</details>

### When a UDP port is closed, by convention the target should send back a "port unreachable" message. Which protocol would it use to do so?

> When a packet is sent to a closed UDP port, the target should respond with an ICMP (ping) packet containing a message that the port is unreachable.

<details>

<summary>Reveal Flag <span data-gb-custom-inline data-tag="emoji" data-code="1f6a9">🚩</span></summary>

:triangular\_flag\_on\_post:`ICMP`

</details>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://thmflags.gitbook.io/thm-walkthroughs/difficulty-easy/nmap/task-7-udp-scans.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.