CCNA Cisco Networking Certification Sample Test

Try 5 free practice questions with instant feedback. See how ready you are.

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Sample Questions

Question 1

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

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?

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?

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?

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?

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.