The Ministry of Education (MOE) and Infocomm Development Authority (IDA) have confirmed that the new measure will not impact teachers at all levels, including those in universities.
In a memo sent on Wednesday to its teachers, MOE said that schools are more dependent on the use of the Internet for teaching and learning. As such, they will "continue to have access to teaching and learning resources on the Internet from their computers".
PM Lee added yesterday: "If your school page with your school anthem gets defaced, well, it's a nuisance but it's not the end of the world.
"So if the schools are on a different system... it's okay, but the government part, I think, must have a secure system to work."
The network that teachers are on is also separate from the Government's main system, said Cyber Security Agency chief executive David Koh.