A network engineer is connecting two branch offices using a traditional T1 leased line. To facilitate this point-to-point connection, a router is placed at each office. Which interface type should the engineer configure on the routers for this type of WAN link?
Serial
ISDN
Fiber Optic
Ethernet
For traditional WAN connections like T1 leased lines, serial interfaces are the correct choice. These interfaces are specifically designed for point-to-point links over long distances, which were common for technologies like T1. Ethernet interfaces are primarily used for Local Area Networks (LANs), although modern WAN services (often called Metro Ethernet) now use Ethernet over fiber. ISDN is an older WAN technology but is not typically used for a dedicated T1 line. Fiber Optic is a Layer 1 physical medium (the cable itself), not a Layer 2 interface type like Serial or Ethernet, which defines the communication protocol and connector.
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