---
title: "Comment by David Cao on \"What is a TCP?\" | Hashnode"
description: "Thanks for the article. We can use tcpdump command to capture tcp packets and learn more about what TCP packets look like. We can also capture particular TCP pa"
url: "https://hashnode.com/posts/what-is-a-tcp/6000fee1c162d710c9b15abe/comment/607bd452c99e200d08f7c1e8"
---

[Discussion](https://hashnode.com/posts/what-is-a-tcp/6000fee1c162d710c9b15abe)

Comment [What is a TCP?](https://hashnode.com/posts/what-is-a-tcp/6000fee1c162d710c9b15abe)

[David Cao](https://hashnode.com/@linux732)

[Apr 18, 2021](https://hashnode.com/posts/what-is-a-tcp/6000fee1c162d710c9b15abe/comment/607bd452c99e200d08f7c1e8)

Thanks for the article. We can use tcpdump command to capture tcp packets and learn more about what TCP packets look like. We can also capture particular TCP packets based on the [TCP flag](https://www.howtouselinux.com/post/tcp-flags) like syn, ack, etc.