Give a short note on Switch , repeater, hub, router bridge, gateway

1.	Give a short note on Switch , repeater, hub, router bridge, gateway
Answer» H \tA repeater is a device that operates only in the physical layer. Signals that carry information within a network can travel a fixed distance before attenuation endangers the integrity of the data.\tA bridge operates in the physical layer as well as in the data link layer. It can regenerate the signal that it receives and as a data link layer device, it can check the physical (MAC) addresses of source and destination contained in the frame.\tA router is a three-layer device that routes packets based on their logical addresses (host-to-host addressing). A router normally connects LANs and WANs in the Internet and has a routing table that is used for making decisions about the route.\xa0\tA gateway is normally a computer that operates in all five layers of the Internet or seven layers of OSI model.

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