To answer this question, you need to understand the purpose and functionality of different network devices.
Option A) Router - A router is a network device that forwards data packets between computer networks. While routers can connect different networks, they primarily route traffic within a network or between networks with similar protocols. They are not specifically designed to connect dissimilar systems.
Option B) Gateway - A gateway is a network device that connects two or more different networks that use different protocols. It acts as a bridge or translator between the networks, allowing dissimilar systems to communicate with each other. Therefore, a gateway is the best device for connecting dissimilar systems.
Option C) NIC (Network Interface Card) - A NIC is a hardware component that allows a computer to connect to a network. It provides the physical interface between the computer and the network. While a NIC is essential for connecting a system to a network, it is not specifically designed to connect dissimilar systems.
Option D) Bridge - A bridge is a network device that connects two or more network segments and forwards data at the data link layer (Layer 2) of the OSI model. It is primarily used to extend a network and create a single logical network. While a bridge can connect different network segments, it does not specifically handle dissimilar systems.
Option E) Firewall - A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. While firewalls play a crucial role in network security, their primary function is not to connect dissimilar systems.
The correct answer is B) Gateway. A gateway is specifically designed to connect different networks with different protocols and allows dissimilar systems to communicate with each other.