To find out specific information about your computers network security you can contact your network admin
If a computer system is operating then it should be utilizing network security. So the answer would be all the time.
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Gerald D. Cole has written: 'Design alternatives for computer network security' -- subject(s): Computer networks, Computer security, Security measures 'Implementing OSI networks' -- subject(s): Computer network architectures, Computer network protocols, Computer networks 'Computer networking for systems programmers' -- subject(s): Computer networks, Systems programming (Computer science)
Computers in a lab are typically on a shared system or network, so it's incredibly important for that system to have multiple layers of security. This would include internal and external measures.
Network & Computer security
Network security can be done in a variety of manners. In general, the methods to perform network security involve constantly updating hardware and software to combat potential computer threats.
computer network security
A router can improve network security if it includes the use of NAT (network address translation) and/or a firewall.
network server
A network security consultant's job is to analyze the possible security risks displayed by the hiring company's computer network. They report on risks discovered, advise as to the severity of these risks, and determine an appropriate plan of action to minimize or eliminate threats to a network's smooth and safe operation.
There are several companies in London that can offer one with network security assessment in London. There is Calyx, Commissum, and Computer Network Defence.