Microsoft Networking Essentials Exam Quality Control & Assurance 3 — Questions and Answers
Question 1: What is the purpose of a network baseline in quality assurance?
- To document normal performance for comparison during issues (Correct answer)
- To reset all network devices to factory defaults
- To block unauthorized network access
- To assign static IP addresses to all hosts
Correct answer: To document normal performance for comparison during issues
A baseline records normal network performance metrics so deviations can be detected and diagnosed.
Question 2: Which command-line tool measures the path and latency between a source and destination on Windows?
- tracert (Correct answer)
- ipconfig
- netstat
- nslookup
Correct answer: tracert
Tracert (traceroute) displays each hop along the network path and the round-trip time to each hop.
Question 3: A VoIP call quality degrades during business hours. Which QoS feature would best address this?
- Prioritizing voice traffic over data traffic (Correct answer)
- Increasing DHCP lease time
- Disabling spanning tree protocol
- Changing the DNS suffix
Correct answer: Prioritizing voice traffic over data traffic
Prioritizing voice traffic ensures VoIP packets are forwarded before lower-priority data during congestion.
Question 4: What does Mean Time Between Failures (MTBF) measure in network quality assurance?
- Average operational time between equipment failures (Correct answer)
- Average time to repair a failed device
- Total downtime over a calendar year
- Number of network errors per hour
Correct answer: Average operational time between equipment failures
MTBF represents the average time a device operates reliably between failures, indicating hardware dependability.
Question 5: Which protocol allows network devices to send alerts to a management system when thresholds are exceeded?
- SNMP (Simple Network Management Protocol) (Correct answer)
- FTP (File Transfer Protocol)
- SMTP (Simple Mail Transfer Protocol)
- HTTP (Hypertext Transfer Protocol)
Correct answer: SNMP (Simple Network Management Protocol)
SNMP traps and notifications alert network management systems when device metrics exceed defined thresholds.
Question 6: A network switch port shows excessive CRC errors in its statistics. What does this indicate?
- Physical layer problems such as bad cable or NIC (Correct answer)
- IP address conflict on the segment
- Duplicate MAC addresses
- Spanning tree loop detected
Correct answer: Physical layer problems such as bad cable or NIC
CRC errors indicate data corruption during transmission, typically caused by faulty cables, connectors, or NICs.
Question 7: In the context of network SLAs, what does 'five nines' availability refer to?
- 99.999% uptime, equaling about 5.26 minutes of downtime per year (Correct answer)
- 99.5% uptime, equaling about 1.8 days of downtime per year
- 5 Gbps guaranteed bandwidth
- Five redundant network paths
Correct answer: 99.999% uptime, equaling about 5.26 minutes of downtime per year
Five nines (99.999%) availability allows only ~5.26 minutes of unplanned downtime annually.
Microsoft Networking Essentials Exam Quality Control & Assurance 3
What is the purpose of a network baseline in quality assurance?