CompTIA
N10-005 · Question #573
N10-005 Question #573: Real Exam Question with Answer & Explanation
The correct answer is A: PSTN. PSTN uses circuit switching, which establishes a dedicated end-to-end path for the duration of a call, unlike the packet-switched technologies in the other options.
Question
Which of the following mediums is circuit switched?
Options
- APSTN
- BATM
- CFrame relay
- DMPLS
Explanation
PSTN uses circuit switching, which establishes a dedicated end-to-end path for the duration of a call, unlike the packet-switched technologies in the other options.
Common mistakes.
- B. ATM (Asynchronous Transfer Mode) is a cell-switching (packet-switched) technology that breaks data into fixed 53-byte cells and routes them across shared network paths.
- C. Frame Relay is a packet-switched WAN technology that routes variable-length frames across a shared network without dedicating a fixed circuit.
- D. MPLS (Multiprotocol Label Switching) is a packet-switched technique that uses short path labels rather than long network addresses to forward packets efficiently across a shared network.
Concept tested. Circuit switching vs packet switching - PSTN
Reference. https://www.techtarget.com/searchnetworking/definition/circuit-switched
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