Consult about hub issues, networking issues hubs

There are many things you can't be sure of in your description, so I'll give you the answer according to your own speculation:

1. If all four can access the Internet, only yours is relatively slow, it should be caused by unreasonable network architecture, it is recommended to change to a switch or a router with a switching function, and set it to DHCP to automatically assign an IP address to surf the Internet, and the effect is much better than using a hub.

2. Your computer can't access the Internet, no problem with other people, you check if it is caused by the repeated conflict between your IP address and the IP address of the new computer, if so, modify the IP address of one of the computers.

The hub is replaced with a switch. Or try changing the IP address.

Is there a conflict of IP addresses?

Troubleshooting ideas:

1.Judge whether the router itself is working normally, after the router is powered on, the lights of all the interfaces will be lit, the router is divided into WAN port and LAN port, the incoming line is connected to the WAN port (1), the computer is connected to the LAN port (multiple), first of all, you can use the computer to connect to the LAN port and log in to the router, Go in to see if the router is normal (note: to ensure that the network cable from the computer to the router is available, after connecting to the LAN port, the normal light corresponding to the LAN port will be on, if not, please check the network cable and crystal head!)

2.If the first step is normal, connect the incoming wire to the WAN port, will the light be on? Change to the LAN mouth test, if it is not lit up, it is likely that there is a problem with the router itself, 3

If you are sure that the router is good, then carefully observe the line sequence of the crystal head to see if it meets the standard (there are two A and B), you can try to make the crystal head again according to the standard method, the following is the line sequence, A is commonly used.

A: White-orange-white-green-blue-white-blue-green-green-white-brown-brown.

b: white-green-green-white-orange-blue-white-blue-orange-white-brown-brown.

I was depressed. The router is not a hub at all, and you use it too?

Wouldn't it be nice if you switched to a hub and went up, or a switch to go up?

I don't know how your problem is. I'm going to copy someone else's for you. Hope you can use it.

Switches are generally used for LAN connections, switches are bridges, are devices at the data link layer, and some switches can also realize Layer 3 switching. The router is used for the connection between wans and wans, which can solve the ** packet between networks of the opposite sex and act on the network layer. They simply accept input packets from one line and then send them to the other line**.

The two lines may belong to different networks and use different protocols. Comparatively speaking, routers are more powerful than switches, but they are also relatively slow and expensive. So the router is slightly slower than the switch (not much relevant), but much faster than a 10m hub.

You can use the route directly as a switch or hub without any changes.

Seriously. Look at this issue for others. Make me feel like your router is broken.

Is there a problem with the line? Is the router good?

**device: This concept is more general, it can be said that other devices are called **device, but there is a narrow term is a layer one device, which does not provide data**, only provides the transfer of bit streams.

Hub: Layer 1 devices, all devices are in the same conflicting broadcast domain, all devices are assembled, and the maximum bandwidth of the frame is provided, which can only provide a maximum of 10M.

Bridge: Strictly speaking, it is a layer 2 device with its own collision domain, in the same broadcast domain, a bit like a switch.

Bridge: A type of bridge.

Switch: Layer 2 devices (Cisco can also be Layer 3 switches), each port is a collision domain, all devices are in the same broadcast domain, providing packet forwarding and MAC addressing. Provides 10-100-1000M bandwidth.

Router: Layer 3 device (Cisco refers to Layer 3 switch or a commercial product of switch), each port has its own broadcast domain and conflict domain. Provides logical addressing, packet**, filtering, paths, and other functions to connect different network segments into internetwork interconnection.

Bridge: I haven't heard of it, but it's probably a bridge with routing, or a simple router.

Gateway: This thing has a broad concept, let me give a simple example, for example, if the people in your classroom have to leave the classroom after class, then they must pass through the door, and this door is like a gateway, and the classmates are the data packets. Here you can simply think of it as an outbound interface from one network to another.

If you don't understand, just q me, 78111148

From the perspective of working mode, the hub is a broadcast mode, that is to say, when a certain port of the hub is working, all other ports have a name to listen to the information, which is prone to broadcast storms. When the network is large, the network performance will be greatly affected, so how to avoid this phenomenon? The switch can play this role, when the switch is working, only the port that makes the request and the destination port respond to each other without affecting the other ports, then the switch can isolate the collision domain and effectively suppress the generation of broadcast storms.

From the perspective of bandwidth, no matter how many ports the hub has, all ports share a bandwidth, and only two ports can transmit data at the same time, and the other ports can only wait; At the same time, the hub can only work in half-duplex mode. For switches, each port has an exclusive bandwidth, when the two ports work, it does not affect the work of other ports, and the switch can work not only in half-duplex mode but also in full-duplex mode.

The network, such as the early hub, is the basic equipment in the data communication system, and it is a hardware device that does not require any software support or requires little management software management, like the transmission medium such as twisted pair.

A router is a device that connects various LANs and WANs on the Internet, and it will automatically select and set routes according to the situation of the channel, and send signals in the order of the best path. A router is the hub of the Internet"Traffic police"。At present, routers have been widely used in all walks of life, and various products of different grades have become the main force to realize the internal connection of various backbone networks, the interconnection between backbone networks, and the interconnection between backbone networks and the Internet.

The main difference between routing and switching is that the switch takes place at the second layer of the OSI reference model (data link layer), while the routing takes place at the third layer, which is the network layer. This difference determines that routers and switches need to use different control information in the process of moving information, so the way they achieve their respective functions is different.

A router, also known as a gateway, is used to connect multiple logically separated networks, and the so-called logical network represents a single network or a subnet. When data is transferred from one subnet to another, it can be done through the router's routing function. Therefore, the router has the function of judging the network address and selecting the IP path, it can establish a flexible connection in the multi-network interconnection environment, can connect various subnets with completely different data packets and media access methods, the router only accepts the information of the origin server or other routers, and belongs to a kind of interconnection device at the network layer.

a.Physical Layer Hunger Bureau.

b.Data link layer bucket.

c.Network layer.

d.Application layer.

Correct answer to the bad hidden case: a