ITPEC IP April 2020 Question 32
Which of the following is the appropriate combination of terms or phrases to be inserted into blanks A through C in the description below concerning networks?
A network of a relatively small area that is installed in the building, etc. is called A, and a network connecting A that are installed at geographically distant points is called B. Generally, for the IP addresses set in the devices that are connected to A, C can be used freely if A is a closed network within the organization, etc.
Explanation
A: LAN(s), B: WAN, C: private IP addresses — a LAN is local, a WAN links distant LANs, and a closed network may use private addresses freely.
- •A: a network covering a limited area, such as one building or one site, is a LAN (Local Area Network).
- •B: a network connecting LANs at geographically distant sites, such as a head office and its branches, usually over a carrier's lines, is a WAN (Wide Area Network).
- •C: private IP addresses are ranges reserved for internal use (
10.,0. 0. 0/8 172.,16. 0. 0/12 192.). They are not routed on the Internet, so any organisation may assign them as it likes inside its own network.168. 0. 0/16
Answer (b)
Why not others:
- •(a) — LAN and WAN are right, but global IP addresses must be unique across the whole Internet and are allocated by registries and ISPs, so they cannot be used freely
- •(c) — swaps LAN and WAN, and also uses global IP addresses
- •(d) — private IP addresses are right, but LAN and WAN are swapped: the network inside a building is the LAN, and the WAN is what connects distant LANs
Key rule: Private addresses can be reused by every organisation because they never appear on the Internet; to reach the Internet, NAT translates them into a global IP address.
Networks · AI-written, may contain errors
This question comes from an official ITPEC past paper. ITPEC Practice is an independent study tool and is not affiliated with ITPEC. See the official IP past-paper collection or Report an issue.