network system

Network routing topology (Topology) Structure refers to the physical layout of interconnecting various devices with transmission media. To realize the interconnection of computers and other devices in the network, they need to be connected in a certain structural manner. This connection method is called"Topology", Popularly talk about how these network devices are connected together. Topology can be divided into four categories: star, bus, ring, and hybrid.

The first layer: physical layer(PhysicalLayer)

Layer 2: Data link layer(DataLinkLayer)

Layer 3: Network layer(Network layer)

Layer 4: Transport layer(Transport layer)

The fifth layer: conversation layer(Session layer)

Sixth layer: presentation layer(Presentation layer)

Layer 7: Application layer(Application layer)、

Network architecture equipment composition:

The main components of the network architecture are: firewall, router, Internet behavior manager, UTN (unified security gateway), switch, server, and wireless AP device. The following is a description of specific devices:

  • 01

    Firewall(Firewall), Also known as a protective wall, it is a network security system located between the internal network and the external network. The so-called firewall refers to a protective barrier formed by the combination of software and hardware equipment and constructed on the interface between the internal network and the external network, and between the private network and the public network. It is an image saying of obtaining security method. It is a combination of computer hardware and software, which makes a security gateway between the Internet and Intranet.(Security Gateway)In order to protect the internal network from illegal users.

  • 02

    The English name of the router is Router, which is a network device used to connect multiple networks or network segments. These networks can be several networks using different protocols and architectures (such as the Internet and local area network), or can be several networks with different network segments (such as networks of different departments in the large Internet). When data information is transmitted from a department network to In another department network, it can be done with a router.

  • 03

    The online behavior manager can effectively regulate employees' online behavior, protect the internal information security of the unit, prevent the abuse of bandwidth resources, prevent irrelevant network behavior from affecting work efficiency, record online trajectories to meet regulatory requirements, control outgoing information, reduce the risk of leakage, and grasp organizational dynamics Optimizing employee management, providing decision-making basis for network management and optimization, preventing network risks such as virus Trojans, low-cost and effective implementation of IT systems, etc.

  • 04

    Unified threat management(Unified Threat Management) Put antivirus, intrusion detection and firewall security equipment under unified threat management(Unified Threat Management, Referred to as UTM) New category, UTM refers to a device with special purpose composed of hardware, software and network technology, which mainly provides one or more security functions, integrates multiple security features into a hard device, constitutes a Standard unified management platform.

  • 05

    switch(Switch)It means "switch" is a kind of network equipment used to forward electrical (optical) signals. It can provide a unique electrical signal path for any two network nodes of the access switch. A common switch is an Ethernet switch. Other common ones include telephone voice switches and fiber optic switches. The switch works at the second layer of the network routing architecture, the data link layer.

  • 06

    A server, also called a server, is a device that provides computing services. Since the server needs to respond to the service request and process it, in general, the server should have the ability to undertake the service and guarantee the service. In the network environment, according to the different types of services provided by the server, it is divided into file server, database server, application server, WEB server, etc.

  • 07

    Wireless AP is an access point for users to enter the wired network using wireless devices (mobile phones and other mobile devices and laptops and other wireless devices). It is mainly used for broadband homes, buildings, campuses, campuses, warehouses, and factories that require wireless monitoring. Locally, the typical distance covers tens of meters to hundreds of meters, and it can also be used for long-distance transmission. At present, the farthest can reach about 30KM.