See related link
Secure Network was created in 2004.
secure network
It is not safe if you don't secure your wifi network. Anyone near you such as your neighbor can share the network and possibly steal all your personal info.
VPN virtual privet network
More secure
BUS topology
Build a moat
# Harder to secure.
The best way to secure any computer network is by using an internet firewall or network security appliances. These appliances track the malicious activities in the network so that proper security action can be taken to protect the network from getting hacked.
Unsecured wireless network without MAC filter.
SMTPv3
The types of jobs that include duties such as keeping a network secure are found in the Information technology sector and revolve around network administration.