Repeaters can't connect different network network architecture such as Ethernet and token ring. Bridge Used to segment a network and reduce network traffic by examining the source and destination hardware address of the packet. Only Translation bridges can connect dissimilar network architectures like Ethernet and token ring. Router Used to route packets to remote networks by examining the packet's network source and destination address. Routers reduce broadcast storms because they don't route broadcast packets.
Routers can connect dissimilar network architectures.
Brouter A combination of Router and a Bridge. Used on networks that have both routable and non-routable protocols. Proxy server Used to isolate internal network computers from the internet. When users on the network want to access the Internet , they first access the Proxy server and the proxy server accesses the internet and retrieves the requested web page or document. The user then gets a copy of that page from the proxy server.