CompTIA Updated N10-009 Exam Questions and Answers by alistair

When high-bandwidth services like videoconferencing are introduced, two primary factors may degrade performance:

Incorrect QoS Settings (E):QoS (Quality of Service) is used to prioritize traffic. If not configured correctly, critical services like video may not get the necessary bandwidth and prioritization.

Network Congestion (F):Video services consume large amounts of data. If the network doesn’t have sufficient bandwidth or is not segmented properly, congestion will slow down all services.

DNS misconfiguration (A) would affect name resolution, not bandwidth.

Malware (C) could degrade performance, but is not tied to the described scenario.

Outdated software (D) may affect performance in some cases, but not directly linked to network congestion in this case.

Inadequate network security (B) isn ' t likely to cause general slowness related to video traffic.

✅ So, the most likely culprits are E. Incorrect QoS settings and F. Network congestion.

The 802.11n standard supports MIMO (Multiple Input Multiple Output), which allows multiple antennas to increase data throughput and improve reliability. Additionally, it uses non-overlapping channels in the 5 GHz band (and optionally the 2.4 GHz band), making it a good choice for high-speed, interference-resistant wireless connections. (Reference: CompTIA Network+ Study Guide, Chapter on Wireless Technologies)

A Power Distribution Unit (PDU) provides multiple power outlets in a data center or IDF (Intermediate Distribution Frame), while offering features like surge protection, load balancing, and sometimes remote monitoring, making it a cost-effective and reliable solution. The document confirms:

“PDUs (Power Distribution Units) are a cost-effective way to expand outlet capacity in a structured cabling environment like an IDF. They ensure safe power delivery to networking equipment and often include monitoring features.”

Quality of Service (QoS) is used to prioritize certain types of traffic to ensure critical applications receive the bandwidth, low latency, and low jitter they need—especially during congestion. Network+ objectives cover QoS concepts such as classification, marking, queuing, and policing/shaping to manage how traffic is handled on interfaces and across links. If the requirement is to prioritize “classified services and applications,” QoS policies can match traffic using ports, protocols, DSCP markings, VLAN tags, or application identifiers and then place that traffic into higher-priority queues or reserve bandwidth for it. Load balancing distributes traffic across multiple servers/paths but does not inherently prioritize one class of traffic over another on congested links. TTL (time to live) is an IP header field used to prevent routing loops and is unrelated to prioritization. A CDN improves content delivery and caching for distributed users, but it is not a traffic-prioritization mechanism within an organization’s network. Therefore, QoS is the correct technology for prioritizing specific services and applications.