Your poll is asking a different question. You said people expected to know this. Implying that there is a minimum level of knowledge required to participate in hacker news.
Your poll is asking do they know what a TCP IP stack is. Even if 100 percent of respondents know, it doesn't validate your claim that hacker news requires this knowledge.
Btw I got really good responses to my questions about networking recently. Should I not be asking these types of questions?
