Refer to the exhibit. An industrial ruggedized network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line attachment to the Internet. Which…

Question

Exhibit

Options

• Aa router with two Ethernet interfaces
• Ba switch with two Ethernet interfaces
• Ca router with one Ethernet and one serial interface
• Da switch with one Ethernet and one serial interface
• Ea router with one Ethernet and one modem interface

• A
  3% (1)
• B
  3% (1)
• C
  78% (31)
• D
  13% (5)
• E
  5% (2)

Explanation

Option C is correct because a leased line is a dedicated WAN connection that uses a serial interface - not Ethernet - and only a router has the Layer 3 capability needed to route traffic between the local network and the Internet. The Ethernet interface handles the LAN side, while the serial interface connects to the leased line's CSU/DSU equipment on the WAN side.

Why the distractors fail:

• A (router, two Ethernet): Routers can handle routing, but Ethernet cannot terminate a leased line - serial is required.
• B (switch, two Ethernet): Switches only operate at Layer 2 and cannot route between networks, plus no serial interface.
• D (switch, one Ethernet + one serial): Even with the correct interface types, a switch lacks routing capability to forward traffic to the Internet.
• E (router, one Ethernet + one modem): A modem interface is for analog dial-up connections, not leased lines, which require serial.

Memory tip: Remember the phrase "Lease the Serial to the Router" - leased lines always terminate on a serial interface, and only a router can connect two different networks (LAN and WAN). If you see "leased line" on an exam, eliminate any answer without both a router and a serial interface.

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