ITPEC IP October 2018 Question 34

Topic: Networks

Among the examples of conducting communication between a PC, a server, a communication device, a printer, etc., which of the following is the list that contains all and only the examples that require the use of a WAN?

A:In a server room, a PC and a web server are connected to the same network hub, and a company overview web page is uploaded from the PC to the web server.B:A notebook PC is connected to an access point in a LAN within a campus of a university, and lecture materials are downloaded from a web server on the same campus.C:A file server connected to a LAN in the Tokyo headquarters is accessed from a PC in the Osaka branch office, and files are downloaded.

Explanation

C only — only the Osaka branch reaching the Tokyo headquarters links sites in different cities, which needs a WAN.

A LAN covers one site, a room, building or campus, over equipment the organisation owns, wired or wireless. Distant sites are joined by a WAN, which uses lines provided by a telecommunications carrier, such as a leased line or an Internet VPN.

  • •A: PC and web server on the same hub in one server room, the same LAN
  • •B: notebook PC through an access point on the campus LAN to a server on the same campus, still a LAN
  • •C: Osaka to Tokyo, hundreds of kilometres apart, a WAN

Answer (d)

Why not others:

  • •(a) A, B — both stay within one site, and C is left out
  • •(b) A, C — A never leaves the server room; the upload goes through one hub
  • •(c) B — wireless does not mean wide area; the access point is part of the campus LAN, and C is left out

Key rule: Within one site, a LAN, wired or wireless; between geographically separate sites, a WAN over a carrier's lines.

Networks · AI-written, may contain errors

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