CISA每日一题

Which of the following devices extends the network and has the capacity to store frames and act as a storage and forward device?

A.Router
B.Bridge
C.Repeater
D.Gateway

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A bridge connects two separate networks to form a logical network (e.g., joining an Ethernet and token network) and has the storage capacity to store frames and act as a storage and forwarding device. Bridges operate at the OSI data link layer by examining the media access control header of a data packet. Routers are switching devices that operate at the OSI network layer by examining network addresses (i.e., routing information encoded in an IP packet). The router, by examining the IP address, can make intelligent decisions in directing the packet to its destination. Repeaters amplify transmission signals to reach remote devices by taking a signal from a LAN, reconditioning and retiming it, and sending it to another. This functionality is hardware-encoded and occurs at the OSI physical layer. Gateways provide access paths to foreign networks.
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