Question 1

What term describes the physical connection between a customer's premises equipment (CPE) and the service provider's nearest point of presence?

Accepted Answer

The local loop (also called the last mile). It is the physical link connecting the customer site to the service provider's central office or point of presence.

Question 2

What is the demarcation point (demarc) in a WAN installation?

Accepted Answer

The demarcation point is the physical location where the service provider's responsibility ends and the customer's responsibility begins, typically marked by a device such as a smart jack or NID.

Question 3

What is the difference between a packet-switched WAN and a circuit-switched WAN?

Accepted Answer

A circuit-switched WAN establishes a dedicated physical path for the duration of a call (e.g., PSTN). A packet-switched WAN shares bandwidth among multiple users by routing individual packets across a shared network (e.g., MPLS, Frame Relay).

Question 4

Which WAN device converts digital signals from a router into analog signals suitable for transmission over the PSTN local loop?

Accepted Answer

A modem (modulator-demodulator) converts digital signals to analog for transmission over the PSTN and converts incoming analog signals back to digital for the router.

Question 5

What is the function of a CSU/DSU in a WAN connection?

Accepted Answer

A CSU/DSU (Channel Service Unit/Data Service Unit) connects a router to a digital leased line. It terminates the digital signal, provides clocking, and performs line conditioning to ensure signal integrity.

WAN Technologies – CCNA Flashcards

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