Write about the three types of network connections and the differences between them

Bridge English name: bridge

Gateway English Name: gateway;

Definition: A facility used to provide network-compatible functions such as protocol conversion, routing, and data exchange when interworking between networks with different architectures or protocols.

Router English name: router

Definition: A device that selects a route for traffic or packets of data.

Common performance indicators for computer networks:

1. Rate: The rate at which the host connected to the computer network transmits data on the digital channel.

2. Bandwidth: the ability of the network communication line to transmit data.

3. Throughput of plum mu.

The amount of data that passes through the network per unit of time.

4. Latency: The time it takes for data to travel from one end of the network to the other.

5. Delay bandwidth product: propagation delay bandwidth.

6. Round-trip time RTT: the time taken from the start to the end of the data.

7. Utilization channel: the time when data passes through the channel.

Extended Information: Latency in a computer network is made up of several different parts:

1) Sending delay.

The send delay is when the host or router sends a data frame.

The time required is the time from the first bit of a data frame to the last bit of the frame to be sent. Therefore, the transmission delay is also called the transmission delay. The formula for calculating the send delay is as follows:

Sending delay = Frame length (bit) Sending rate (bits).

2) Propagation delay.

The propagation delay is an electromagnetic wave.

The time it takes to propagate a certain distance in a channel. The propagation delay is calculated by the following formula:

Propagation delay = channel length (m) The maximum propagation rate of electromagnetic waves on the channel (m s).

The propagation rate of electromagnetic waves in free space is the speed of light. Namely.

The transmission delay occurs in the transmitter inside the machine and has nothing to do with the length of the transmission channel. The propagation delay occurs on a transmission channel** outside the machine, regardless of the channel's transmit rate. The farther the signal is traveled, the greater the propagation delay.

3) Processing delay.

When a host or router receives a packet, it takes a certain amount of time to process it, such as analyzing the head of the packet, extracting the data part from the packet, performing error checking, or finding a suitable route, which results in processing delay.

4) Queue holes to slow down the delay.

Packets go through a number of routers during network transmission. However, packets must be queued in the input queue after entering the router, and queued in the output queue after the router determines the interface. Namo: This creates a queuing delay.

The length of the queuing delay depends on the amount of traffic on the network at that time. When the network has a large amount of traffic, a queue overflow occurs, causing packets to be lost, which is equivalent to an infinite queue delay.

In this way, the total delay experienced by data in the network is the sum of the above four delays: total delay = sending delay + propagation delay + processing delay + queuing delay.

In general, networks with hourly latency are better than networks with large latency.

A point-to-point connection is one in which only two devices have a denied connection. It is the most basic connection method in network communication and is often used to connect between local area networks and wide area networks. Ode to the Stove.

A multipoint connection is when multiple devices are connected. It is often used to establish connections between multiple devices within a local area network so that they can clearly share resources and data.

A virtual connection is a logical connection established through a network protocol that does not require a physical connection. Virtual connections are often used in virtual private networks (VPNs) so that remote users can access resources within the enterprise over a public network.

Answer]: The World Wide Web is not synonymous with the Internet, but a service operated by Sun Qiao on the Internet. Wide area networks and local area networks are computer networks that are classified according to the different network coverage.

These two concepts focus on the issue of network coverage. The Internet is an international computer network that is connected to each other through communication lines. According to the theme, so choose B.

6. Write new words on the Internet according to the meaning. +1.A network consisting of several computer networks connected to each other. +2.Finger.

The Internet is a network composed of several electronic computer networks connected to each other. The largest Internet at the moment is the Internet. China's Internet Oak Sparrow is developing rapidly.

In the network of the Zen computer, () is mainly used to connect different types of networks in Mingchen.

a.Hub.

b.Gateway. c.Repeaters.

d.Network card. Correct answer: Zheng Wei: b

According to the scope of the network, the network is divided into ().

Correct answer: ABCD

Answer]: C gateway can connect two different types of networks and complete network protocol conversion, C option is correct; The network card is an interface device that enables the computer to connect to the network for the first time, and option A is incorrect; A bridge is a network connection device that connects two networks of the same type, and the router connects multiple networks of the same type and implements routing according to the network state address, so options b and d are incorrect.