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The device that connects two networks at the highest level
of the ISO-OSI framework ( i.e., application layer) is a
A. Gateway
B. Router
C. Bridge
D. Brouter
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Answer: A
Gateway is used to connect two networks using dissimilar
protocols at the lower layers through which connectivity is
established namely physical, data link, network and
transport layers. Router is a network layer device for which
the two connecting networks must have the same network layer
protocol. Bridge operates in the data link layer. It should
have data link layer protocols, such as token ring,
Ethernet, in use in both the networks. Brouter is
essentially a bridge with some routing functionality.
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