Which type of network is most vulnerable to intrusion? 03/11/2017 – by Mod_GuideK 0 Which type of network is most vulnerable to intrusion? A. Dial-up B. Wireless C. Broadband D. Leased line SHOW ANSWERSCorrect Answer: B Explanation/Reference: Insecure Wi-Fi is the easiest way for people to access your home network, leech your internet, and cause you serious headaches with more malicious behavior.