Explain the role of a router in the OSI model and its functions in data transmission.

Explain the concept of WAN routing and the role of routing protocols in determining the optimal path for data packets.

Explain the role of a network switch in the OSI model. What layer does it primarily operate at, and how does it facilitate communication between devices?

Explain the concept of MPLS (Multiprotocol Label Switching) and its role in WAN traffic routing and prioritization.

What are routers' four major functions?

Explain the role of a router in the OSI model and how it facilitates communication between different networks.

Explain the functionality of routers in the OSI model, emphasizing their role in connecting different network segments and facilitating communication between them.

Explain the concepts of MPLS (Multiprotocol Label Switching) and its role in improving network routing and traffic engineering.

Unlike datagram and virtual-circuit networks, circuit-switched networks do not need a routing or switching table to establish the output port from which destination-related data may be sent. Explain the cause of this disparity.