Broadway Café’s owner wants one network design choice for each situation below: 1) connect devices within a single store; 2) connect multiple stores across different cities. Which pairing is best?

Question

BlackTom AI · Accepted Answer

A Local Area Network (LAN) connects devices within a single physical site, while a Wide Area Network (WAN) links sites across cities or countries.

1) Relevant knowledge points and concepts
- LAN: network confined to a building or campus (typical technologies: Ethernet, Wi‑Fi); low-latency, high-bandwidth, privately managed.
- WAN: connects geographically dispersed sites (multiple cities) using telecom/ISP links, leased lines, MPLS, VPN over the Internet.
- PAN: Personal Area Network (very short range, e.g., Bluetooth between a phone and headset).
- WLAN: Wireless LAN (Wi‑Fi) is a type of LAN—still local in scope.
- MAN: Metropolitan Area Network (covers a city or metropolitan area, larger than LAN but smaller than WAN).

2) Step-by-step reasoning process
- Requirement 1: "connect devices within a single store" implies a single physical location; that scale is exactly what a LAN is designed for.
- Requirement 2: "connect multiple stores across different cities" implies wide geographic dispersion; that requires WAN infrastructure to interconnect multiple LANs across long distances.

3) Intermediate steps / clarifications
- For one store: choose LAN (wired Ethernet or WLAN inside that store).
- For multiple cities: connect each store’s LAN via WAN services (VPN over the Internet, leased circuits, or MPLS) so they can communicate as one enterprise network.

4) Why the correct answer is correct
- LAN fits the single-store scope and provides necessary local connectivity. WAN fits the multi-city scope because WANs span large geographic distances and are explicitly designed to interconnect remote LANs.

5) Why other options are incorrect
- "PAN for one store; WLAN for multiple cities": PAN is too limited (personal devices only); WLAN is still local and cannot span cities.
- "WAN for one store; LAN for multiple cities": reversed scales; WAN is overkill and not necessary for intra-store linking; LAN cannot span cities.
- "Bluetooth for one store; MAN for multiple cities": Bluetooth (a PAN technology) is unsuitable for a full-store network; MAN covers a single metropolitan area, not multiple cities.

6) Conclusion
Therefore the best pairing is: LAN for one store; WAN for multiple cities. This matches the provided correct answer.

Broadway Café’s owner wants one network design choice for each situation below: 1) connect devices within a single store; 2) connect multiple stores across different cities. Which pairing is best?单项选择题

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