H11-811 · Question #7
Company A plans to deploy the automatic switchboard service, through which users can dial the desired extension numbers or dial 0 to connect to the secretary deployment as prompted. The short…
The correct answer is B. 4. Option B (4) is correct because the auto-attendant should only accept the number of digits matching the internal short extension format-four digits. By capping post-dial input at 4 digits, external callers can reach any valid internal extension but cannot dial longer digit…
Question
Company A plans to deploy the automatic switchboard service, through which users can dial the desired extension numbers or dial 0 to connect to the secretary deployment as prompted. The short numbers for company A's employees contain four digits, and the long numbers contain eight digits. To prevent toll fraud of external users, the length of the number dialed following the automatic switchboard number needs to be limited to () digits.
Options
- A1
- B4
- C8
- D2
How the community answered
(26 responses)- A8% (2)
- B85% (22)
- C4% (1)
- D4% (1)
Explanation
Option B (4) is correct because the auto-attendant should only accept the number of digits matching the internal short extension format-four digits. By capping post-dial input at 4 digits, external callers can reach any valid internal extension but cannot dial longer digit strings that might route out to external PSTN lines, which is the mechanism behind toll fraud.
Why the distractors fail:
- A (1): One digit only covers dialing "0" for the secretary; callers couldn't reach any four-digit extension at all.
- C (8): Allowing 8 digits defeats the purpose-callers could potentially dial external long numbers (e.g., a full PSTN route), which is exactly the toll fraud scenario the restriction is meant to block.
- D (2): Two digits is too short to accommodate any four-digit extension and has no logical basis in the system's numbering plan.
Memory tip: Match the limit to the shortest complete extension length-"short numbers, short limit." Since the smallest usable extension is 4 digits, that's your ceiling. Think: "4-digit extensions = 4-digit cap = fraud blocked."
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