Test

Question 1

Front (Question & Answer Choices)

Answer 1

Back (Answer, Explanation, and Details)

Question 2

A 40 Gbps fiber link in a data center is experiencing intermittent packet loss and high latency. What is the most likely cause?
A) Using an LC connector instead of MPO
B) Dust contamination on fiber connectors
C) Single-mode fiber used in multimode transceivers
D) Electromagnetic interference (EMI) from nearby power sources

Answer 2

Correct Answer: D) Electromagnetic interference (EMI) from nearby power sources.

Why? High-frequency fiber optics are immune to EMI, but transceivers and switches may be affected, causing performance degradation.

Why Others Are Incorrect:
A) LC connectors are used in single fiber connections, but 40 Gbps often requires MPO for parallel optics.
B) Dust contamination causes signal degradation but not intermittent issues at high speeds.
C) A mode mismatch would result in a hard failure, not intermittent packet loss.

Practical Use: Ensure proper shielding for network equipment near high-EMI environments.

Exam Objective Reference: Domain 1.5 - Troubleshooting fiber optic performance.

Follow-Up: How does OM4 multimode fiber improve performance in 40 Gbps networks?

Question 3

Which protocol operates at Layer 4 and provides reliable communication?
A) TCP
B) UDP
C) ICMP
D) ARP

Answer 3

Correct Answer: A) TCP

Why? TCP ensures reliable, ordered, and error-checked delivery of data.

Why Others Are Incorrect:
B) UDP is connectionless and unreliable.
C) ICMP is used for network diagnostics.
D) ARP resolves MAC addresses, not transport layer communication.

Practical Use: Used for applications requiring guaranteed delivery, such as web browsing and email.

Exam Objective Reference: Domain 1.2 - Transport Layer Protocols.

Follow-Up: What is the difference between TCP and UDP in video streaming?