Volume 2 : Network Security

In Section 6, Video 35 regarding to WiFi Weaknesses, the tutor mentions using commonly used SSID name are vulnerable to password guessing attack and dictinary attack, may I know how commonly used SSID name would make the router more vulnerable?

Every router ships with default SSID and password. The majority of people don’t change the password or both password and SSID. This is what makes it easy for attackers to perform dictionary attacks or password guessing attacks as most of the routers have the default credentials posted on their website.