What are the differences between a bridge and a repeater?
A, transparent bridges, simply speaking, do not need to change hardware and software using this bridge without setting up address switches without routing tables or parameters. Simply plug in the cable and the existing LAN is completely free from any impact of the bridge. The core idea of B, source routing, and Bridge source routing is to assume that the sender of each frame knows whether the receiver is on the same local area network (LAN). When sending a frame to another segment, the source machine sets the destination address to 1 as a mark.
1) data link layer, the two local area network (LAN) together, according to the MAC address (physical address) to transmit the frame, can be seen as a "low-level router" (routers in the network layer, such as the network address IP address forwarding).2) it can effectively connect two LAN, restrict the local communication to the network segment, and forward the corresponding signal to another segment. The bridge is usually used to connect the same type of network segment with a small number of connections.3) bridges usually have two categories: transparent bridges and source routing bridges.
A repeater is a form of bridge,1) a repeater is a device for connecting network lines, often used for two-way forwarding of physical signals between two network nodes. 2) is the most simple repeater network interconnection equipment, mainly to complete the physical layer, is responsible for the physical layer of two nodes according to a transmission of information, copy, adjust and complete the signal amplification function, in order to prolong the network length.3) because of the loss, the signal power transmitted on the line will be gradually attenuated. When attenuation to a certain extent, it will cause signal distortion, which will lead to a reception error. Repeaters are designed to solve this problem.4) it completes the connection of the physical circuit and amplifies the attenuated signal to keep the same as the original data.5) in general, both ends of the repeater are connected to the same media, but some repeaters can also do the switching of different media.6) in theory, the use of repeaters is unlimited, and the network can therefore be indefinitely extended. In fact, this is impossible, because the network standards are specific to the delay range of the signal, the repeater can only work effectively within this set of regulations, otherwise it will cause network failure.
Repeater。 The physical layer device, divided into two kinds of active and passive, active repeater signal amplifying and shaping the role of passive repeater role is purely connecting the two segments (or two devices) of the physical link, it does not provide the signal shaping amplifier, passive relay equipment and a cable network is not what difference. Repeaters on the market have now been eliminated by the HUB.Bridge. English name Bridge, link layer device. The main function is to divide the collision domain and reduce the broadcast traffic in the network. Usually in large network early, when the HUB number, the collision domain is too large, it will cause the broadcast storm, when appropriately placed on the intermediate network bridge can separate collision domains, may reduce the broadcast storm. The key point is to study the working principle of the bridge, that is, the learning and maintenance function of the MAC address table. Because it is more advanced than HUB and repeaters, it can process data frames, the bridge can determine whether a data frame belongs to the network A or network B, and then intelligently forward or discard.
