ACtE08 · Chapter 8Demo2 · Set 2🏛️ Past Licensure QuestionID: 371f6206
Which of the following communication tasks is strictly time-sensitive and delay-intolerant (real-time)?
Which of the following communication tasks is strictly time-sensitive and delay-intolerant (real-time)?
Multiple Choice Options
- A✓ Correct Option
Mobile telephony (voice communication)
- B
File download
- C
File transfer (FTP)
- D
Electronic mail (E-mail)
Detailed Technical Solution & Explanation
Communication applications fall into two fundamental classes:
•
Real-time / Delay-intolerant: Mobile telephony (voice calls) and video conferencing. Humans perceive interactive conversational lag if one-way latency exceeds 150 ms or if packet jitter causes audible stuttering. Packets arriving late are useless and must be dropped.
•
Elastic / Delay-tolerant: File downloads (HTTP), file transfers (FTP), and email (SMTP). These can tolerate delays of seconds or hours provided data is delivered without packet loss.
Option Analysis:
•
Option A (Mobile telephony (voice communication)): Correct; strictly delay and jitter sensitive.
•
Option B (File download): Incorrect; elastic transfer capable of buffering.
•
Option C (File transfer (FTP)): Incorrect; delay-tolerant service.
•
Option D (Electronic mail (E-mail)): Incorrect; asynchronous store-and-forward architecture.
Reference: Demo2 · Set 2NEC Licensure Syllabus