Specialist Networking devices
What’s a hub?: A hub is "a collection of network supply sockets and devices" for nodes =other computers to join to on a network-usually the server-=, inclusive is a set of NIC cards in the hub for the data flow
control. Newer hubs often combine router/NIC/sockets=generally RJ45 connector= .
Problems with hubs: Mainly their management by their composition of hardware parts and data flow handling ratings.
What’s a switch?
A switch is a loose term to me since they come in the mentioned variety of software and their standard block lump of a physical electrical line data flow controller. e.g. CLUNK! exactly.
What’s a router?
A router is "a physical hardware gateway between domains" often is a combination of NIC card=for data flow control= and slave computer "to control data flow by and with NIC card settings=Adress and port=" but also with some software=router driver libraries=.
What it "actually does" is "sit between two domains=set of node computers or servers= as a physical gateway". A "domain" is "a software registered network group"=a set of computer nodes, server / router / workstation= in the being that it does not require to be registered to or known of by computers on the other side of the
"gateway"=router / server / switch / bridge=.
A domain has a "name"=alias and a software network address=of an address scheme of type A B C D or E=.
The address is assigned to the gateway router through its software at setup using port numbers assigned to relevent IRQ's=physical main-board hardware port of the router= and often operates by an action called "port forwarding" =redirection from the assigned IRQ on one side out its other IRQ=to be brief= to an assigned machine subnet-mask-address and port on the other side. note: effectively an IRQ is physical, and a port is software alias for the IRQ.