(rewritten from PC World Oct Issue, Column of Fact Check)

Question:  I have a WI-FI router and heard that the wireless router has a built-in firewall; do I need bother installing any software firewall on my computer?

Answer:  Yes, you still need install software firewall. …; Ultimately, going online with only a router firewall is a bit like riding a motorcycle while wearing nothing but a helmet: Sure, you have a bit of protection, but you are mostly naked.