Do network routers forward packets toward their destinations and, based on routing metrics, attempt to select efficient paths across interconnected networks?

Introduction / Context:
Routers are core devices in packet-switched networks. They use routing tables and protocols to decide where to send IP packets next. The question probes a foundational understanding of routing behavior and path selection.

Given Data / Assumptions:

• Routers operate primarily at the network layer.
• They consult routing tables built via static entries or dynamic protocols (e.g., OSPF, BGP).
• “Efficient pathway” refers to routes optimized by metrics like cost, hop count, latency, or policy.

Concept / Approach:
Routers examine destination IP addresses, look up the best next hop, and forward packets accordingly. Dynamic routing protocols compute paths using algorithms and metrics, striving for efficiency or policy compliance. Thus, saying routers forward packets and try to use efficient pathways is correct.

Step-by-Step Solution:

Verification / Alternative check:
Observe traceroute outputs: routers along the path forward traffic hop by hop following routing decisions.

Why Other Options Are Wrong:

• Incorrect: contradicts networking fundamentals.
• “Only in a LAN”: routers interconnect different networks, not just a single LAN.
• Switches work at the data link layer using MAC forwarding; they are not routers.

Common Pitfalls:
Confusing routers with switches; assuming “most efficient” always means shortest path—policy-based routing may choose otherwise.

Final Answer:
Correct