Microsoft Networking Essentials Exam Quality Control & Assurance 4 — Questions and Answers
Question 1: Which Windows Performance Monitor counter is most useful for monitoring network quality?
- Network Interface\Packets/sec (Correct answer)
- Processor\% Processor Time
- Memory\Available Bytes
- PhysicalDisk\Disk Reads/sec
Correct answer: Network Interface\Packets/sec
The Network Interface Packets/sec counter reveals traffic volume and can expose abnormal network activity.
Question 2: What is the function of a network protocol analyzer in quality assurance?
- Capturing and inspecting packet data to diagnose problems (Correct answer)
- Assigning IP addresses to network hosts
- Blocking malicious network traffic
- Routing packets between network segments
Correct answer: Capturing and inspecting packet data to diagnose problems
A protocol analyzer (like Wireshark) captures packets for detailed inspection to identify errors, delays, and anomalies.
Question 3: A technician suspects a duplex mismatch between a switch and a server NIC. What symptom would confirm this?
- High late collisions and poor throughput (Correct answer)
- IP address conflicts on the subnet
- DNS resolution failures
- DHCP lease exhaustion
Correct answer: High late collisions and poor throughput
Duplex mismatches cause late collisions and significantly reduced throughput because one side operates half-duplex.
Question 4: Which IP header field is used to prevent packets from circulating indefinitely on a network?
- TTL (Time to Live) (Correct answer)
- Protocol
- TOS (Type of Service)
- Identification
Correct answer: TTL (Time to Live)
The TTL field decrements at each hop; when it reaches zero the packet is discarded, preventing routing loops.
Question 5: What does the 'netstat -e' command display that is useful for quality assurance?
- Ethernet statistics including errors and discards (Correct answer)
- Active TCP connections and listening ports
- Current routing table entries
- DNS cache contents
Correct answer: Ethernet statistics including errors and discards
Netstat -e shows Ethernet statistics such as bytes sent/received, errors, and discarded packets for quality assessment.
Question 6: In wireless networking quality assurance, what does SNR (Signal-to-Noise Ratio) measure?
- The difference between signal strength and background noise (Correct answer)
- The total number of connected wireless clients
- The encryption strength of the wireless signal
- The maximum distance from the access point
Correct answer: The difference between signal strength and background noise
SNR measures how much stronger the desired signal is compared to background noise; higher SNR means better wireless quality.
Question 7: Which approach best ensures ongoing network quality after initial deployment?
- Continuous monitoring with defined thresholds and alerts (Correct answer)
- Replacing all hardware every six months
- Disabling unused network features permanently
- Running manual ping tests weekly
Correct answer: Continuous monitoring with defined thresholds and alerts
Continuous monitoring with automated alerts ensures issues are caught and resolved before they impact users.
Microsoft Networking Essentials Exam Quality Control & Assurance 4
Which Windows Performance Monitor counter is most useful for monitoring network quality?