Hardware devices in computer network include servers, switches , routers, client terminals, firewalls, transmission media, transceiver , etc. Any problems with these devices will cause network to work abnormally.
server refers to a computer device that manages resources and provides services to users. In a network environment, according to the service type provided by the server, it is divided into file server, database server , application server, WEB server , etc.
router is a device connected to each LAN in Internet and WAN . It will automatically select and set the route according to the channel situation, and send signals in the best path and in the order of front and back. Routers are the hub of the Internet.
switch is a network device used for electro-optical signal forwarding. It can provide any two network nodes that access the switch. The most common switch is an Ethernet switch. Other common ones include phone voice switches, fiber switches, , etc.
Firewall: Firewall refers to a protective barrier composed of software and hardware devices, constructed on the interface between the internal network and the external network, and between the dedicated network and the public network. It is an image saying that the method of obtaining security is obtained.
It is a combination of computer hardware and software, which establishes a secure gateway between Intranet and Intranet, thereby protecting the intranet from intrusion by illegal users. The firewall mainly consists of four parts: service access rules, verification tools, package filtering and application gateway. The firewall is a software or hardware located between the computer and the network it is connected to. All network communication and data packets flowing in and out of the computer must pass through this firewall.
