Multiple choice

Which of the following statements accurately describes a role that is played in establishing a WAN connection?

  1. ISDN and ATM are circuit-switched technologies that are used to establish on demand a path through the service provider network.

  2. Data link layer protocols like PPP and HDLC define how data is encapsulated for transmission across a WAN link.

  3. A packet-switching network establishes a dedicated circuit between nodes for the duration of the communication session.

  4. Frame relay switches are normally considered to be customer premises equipment (CPE) and are maintained by local administrators.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Data link layer protocols like PPP (Point-to-Point Protocol) and HDLC (High-Level Data Link Control) define how data is encapsulated into frames for transmission across WAN links. They handle framing, error detection, and authentication. Option A is incorrect because ISDN is circuit-switched but ATM is a cell-switched technology. Option C describes circuit-switching, not packet-switching. Option D is wrong because Frame Relay switches are service provider equipment, not customer premises equipment maintained by local administrators.

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