Networking scope classification: when a group of computers is connected together in a small area (such as a room, floor, or building) without relying on public telephone lines, what is this network commonly called?

Introduction / Context:
Networks are often categorized by geographic scope. The smallest common category interconnects endpoints within a limited area using private cabling or Wi-Fi, providing high speeds and low latency without the need for carrier-provided telephony links.

Given Data / Assumptions:

• The area is small (room, floor, building, campus segment).
• No dependency on public telephone lines is implied.
• Private cabling or wireless infrastructure is used.

Concept / Approach:
Such a network is a Local Area Network (LAN). It contrasts with WANs, which span cities or countries and usually involve carrier services. VANs refer to value-added networks offering overlays/services; RCN is not a standard term in this context.

Step-by-Step Solution:

Verification / Alternative check:
Textbooks and certifications define LANs as local interconnections typically using Ethernet/Wi-Fi within private premises.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming any network using wireless must involve the telephone network; LANs can be fully private.

Final Answer:
Local area network (LAN).