What are the commonly used network devices? What is the approximate functional application of each?

Network adapter: also known as network interface card (network card), it is plugged into the bus of the computer to connect the computer to other network equipment, and the network adapter generally only realizes the functions of the network physical layer and the data connection layer.

Network transceiver: It is an interface device for network adapters and transmissions. It provides signal level translation and signal isolation.

Network Conversion Equipment: It is a conversion device between different transmissions in the network. Such as twisted pair and optical fiber, etc.

Multiplexer: A type of terminal controller. It is used to improve the utilization of communication channels.

Interrupter: also known as a disruptor, extends the transmission distance, such as an Ethernet interrupter can be used to connect different Ethernet segments to form an Ethernet.

Hub: Abbreviation, hub, can be thought of as a multi-port interrupter (one interrupter is dual-ported).

The above devices are all network devices working at the physical layer.

Bridge: Two LANs can be connected into a logical LAN. Network-connected devices that operate at both the physical and data connection layers.

Switches: Early switches were the equivalent of multi-port bridges.

Router: An interconnected device that operates between multiple networks at the network layer. It provides the ability to select paths between networks.

Gateway: It can be regarded as a general term for multiple interconnected devices between networks, but generally refers to the equipment that realizes the interconnection of multiple networks above the transportation layer, also known as the application layer gateway.

Cat: It's ADSL, which is the first gateway between computers and Internet games, and a necessity for personal broadband users.

Switches: In the early stage, it was a hub, but with the development of technology, it has been gradually replaced by switches. It is said that the current state-of-the-art smart switch can already replace routers.

Switches are mainly used in large-scale network environments for network development, connection, and data distribution. It is equivalent to a splitter in a circuit.

Routers: This plays a vital role in digital networks.

Wireless routers, 3G wireless routers, and so on.

Network interconnection devices: hub (physical layer), bridge (data link layer), switch (data link layer), router (network layer), gateway (upper layer).

Function: 2. Hub (hub): It is equivalent to a cable to connect each network node, while the switch can provide a data channel between any two network nodes, which prevents the occurrence of conflicts and can meet the current user's demand for high-speed data exchange.

3. Bridge: It works at the data link layer, connects the two LANs, and can be regarded as one according to the MAC address"Low-level routers"(The router works at the network layer and is based on the network address such as the IP address**). It is a storage device that connects two LANs and can be used to connect network systems with the same or similar architecture.

4. Routers: Handle data at the network layer, so it is easier for them to interconnect different data link layers, such as the Token Ring segment and the Ethernet segment. Bridges are often more difficult to control than routers.

Network cards, network cables, switches, routers. Moden (cat) This is a common device.

The NIC function is to receive data packets, decompose data packets, convert and read data content, package data content, and send data to a specified address.

ADSL is responsible for signal conversion, routers are responsible for Layer 3 IP addressing, which is used as a gateway to connect to the Internet, and switches are responsible for Layer 2 MAC address speed, which is used in LAN.

This range is too wide, the display, host, router, and so on are too wide.

The router, which has routing function and subnet function, is suitable for a small network at the edge of a large network, and can shield internal communication externally.

Switches, like the LAN part of a router, can communicate with each other in a network and can have some additional Layer 2 and Layer 3 features.

Common network devices include:

1.Router: Used to select and route data between different networks.

2.Switch: Used for data mating within the local area network.

3.Firewalls: Used to secure the network and prevent unauthorized access and attacks.

4.Network storage devices: used to store and share data, such as network hard disks and NAS.

5.Network Printers: Codes are used to share printer resources on a network. Pei Xiao.

9.Network Power Manager: Used to remotely control and manage the power supply of network devices.

10.Network fax machine: Used to send and receive faxes over the network.

<>1. Switches. Switching technology is used to increase the sum of data input and output and the bandwidth of the mounting medium. Typical switches** have very low latency and can economically divide the network into small, collision domains, providing higher bandwidth for each workstation.

It can be understood as an advanced bridge, which has the function of a bridge, but the performance is stronger than that of a bridge.

2. Bridge. A bridge, also known as a bridge, is a storage device that connects two LANs, and can be used to connect network systems with the same or similar architecture.

3. The repeater is a device for connecting network lines, and is often used for the two-way operation of physical signals between two network nodes. The repeater is the simplest network interconnection device, which mainly completes the function of the physical layer, is responsible for transmitting information bitwise on the physical layer of the two nodes, and completes the replication, adjustment and amplification of the signal, so as to extend the length of the network. It is a simple signal amplifier, the signal is attenuated in the process of transmission, and the role of the repeater is to amplify the signal so that the signal can be transmitted farther.

4. A router. A router is a connection at the network layer, that is, a connection between different networks. The choice of path is the main task of the router. Path selection includes two basic activities: one is the determination of the best path; The second is the transmission of inter-network information packets.

5. a gateway. A gateway (protocol converter) is a facility with a hand-sparrow protocol translation function that operates on top of the OSI network layer in an interconnected network, so it is called a facility because the gateway is not necessarily a device, and it is possible to implement the gateway function in a host.