First of all you can use a separate room with limited access, also there are some special safes you can purchase. Safes allow to block physical access to equipment. They are pricey though.
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Router
bridge
STAR Topology
It is a network adapter whether it is wireless or wired type.
A virtual network adapter can also be used with a virtual private network (VPN), which is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or individual users with secure access to their organization's network.
Peer-to-peer
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.
Hard Copy
AnchorFree is a type of software that provides VPN, or virtual personal network services. This is a secure network that blocks mal-ware and protects the data that you are accessing.
Unicast.
An MSTV client device assigned a unique identity by the manufacturer is typically a set-top box. Each set-top box is equipped with a unique identifier, such as a MAC address or a device ID, which allows it to be recognized on a network. This unique identity facilitates secure communication and management of the device within the MSTV ecosystem.