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Mark works as a project engineer in Tech Perfect Inc. His office is configured with Windows XP-based computers. The computer that he uses is not configured with a default gateway. He is able to access the Internet, but is not able to use e-mail services via the Internet. However, he is able to access e-mail services via the intranet of the company. Which of the following could be the reason of not being able to access e-mail services via the Internet?
Correct Answer:
C is incorrect. A router is a device that routes data packets between computers in different networks. It is used to connect multiple networks, and it determines the path to be taken by each data packet to its destination computer. A router maintains a routing table of the available routes and their conditions. By using this information, along with distance and cost algorithms, the router determines the best path to be taken by the data packets to the destination computer. A router can connect dissimilar networks, such as Ethernet, FDDI, and Token Ring, and route data packets among them. Routers operate at the network layer (layer 3) of the Open Systems Interconnection (OSI) model.