CompTIA N10-009 Online Practice Questions and Exam Preparation

CompTIA N10-009 Online Questions & Answers

• Question 261:

  Which of the following physical installation factors is the most important when a network switch is installed in a sealed enclosure?

  A. Fire suppression
  B. Power budget
  C. Temperature
  D. Humidity
  C. Temperature

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  Explanation

  Switches in sealed enclosures are at risk of overheating because airflow is restricted. The temperature factor is critical since heat buildup can damage components, shorten device lifespan, and cause outages. Proper cooling or ventilation must be ensured.

  Option A: Fire suppression is important for data centers but not the primary concern in a sealed box.

  Option B: Power budget applies to PoE allocations, not environmental safety.

  Option D: Humidity matters, but overheating is far more immediate in sealed environments.

  References:

  Domain: Network Infrastructure -- Environmental considerations, switch installation, temperature control.

• Question 262:

  Which of the following OSI model layers can utilize a connectionless protocol for data transmission?

  A. Physical
  B. Network
  C. Transport
  D. Application
  B. Network

• Question 263:

  A network administrator is connecting two Layer 2 switches in a network. These switches must transfer data in multiple networks.

  Which of the following would fulfill this requirement?

  A. Jumbo frames
  B. 802.1Q tagging
  C. Native VLAN
  D. Link aggregation
  B. 802.1Q tagging

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  Explanation

  802.1Q tagging, also known as VLAN tagging, is used to identify VLANs on a trunk link between switches. This allows the switches to transfer data for multiple VLANs (or networks) over a single physical connection. This method ensures that traffic from different VLANs is properly separated and managed across the network.

  References:

  CompTIA Network+ study materials.

• Question 264:

  SIMULATION

  A network administrator receives a ticket stating there is a connectivity issue between the server and the storage devices. The administrator needs to identify any issues and implement the appropriate solutions.

  INSTRUCTIONS

  Click on each access and core switch. Enter commands into the terminal to identify any problems and select the appropriate resolutions. Type help in each terminal to view a list of available commands.

  If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

  

  

  

• Question 265:

  Which of the following describes a connectionless protocol?

  A. TCP
  B. UDP
  C. FTP
  D. HTTPS
  B. UDP

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  Explanation

  User Datagram Protocol (UDP) is a connectionless protocol that does not establish a session before transmitting data. It sends packets without guaranteeing delivery, order, or duplication protection, making it faster and suitable for real-time applications like streaming and VoIP. TCP is connection-oriented and ensures reliable delivery. FTP and HTTPS operate over TCP. UDP sacrifices reliability for speed and efficiency.

• Question 266:

  A network engineer needs to prioritize traffic over a link with the goal of more effectively utilizing the connection.

  Which of the following should the engineer implement?

  A. CDN
  B. VPN
  C. TTL
  D. QoS
  D. QoS

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  Explanation

  To prioritize traffic and utilize a constrained link more effectively, the engineer should implement QoS (Quality of Service). QoS is a set of mechanisms that classifies and marks traffic (for example, voice, video, business-critical apps) and then applies queuing and scheduling behaviors to ensure important traffic receives preferential treatment during congestion. Network+ objectives commonly connect QoS to supporting real-time applications (VoIP/video) by reducing latency, jitter, and packet loss, while preventing less critical traffic (bulk transfers, updates) from consuming all available bandwidth. Techniques can include traffic classification, DSCP marking, priority queuing, and traffic haping/policing.

  A CDN improves content delivery by caching closer to users, but it doesn't provide link-level rioritization for all traffic types. A VPN provides secure tunneling/encryption, not prioritization. TTL (Time To Live) is an IP header value used to prevent routing loops by limiting packet lifespan; it does not manage bandwidth or prioritize flows. QoS is the standard solution when the goal is to control how bandwidth is allocated under load and to ensure critical services remain performant.

• Question 267:

  Users are reporting issues with mobile phone connectivity after a cellular repeater was recently installed. Users also note that the phones are rapidly losing battery charge.

  Which of the following should the technician check first to troubleshoot the issue?

  A. WPS configuration
  B. Signal strength
  C. Channel frequency
  D. Power budget
  B. Signal strength

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  Explanation

  When signal strength is poor, mobile devices constantly boost their transmission power in an attempt to maintain a stable connection. This results in dropped calls/data and rapid battery drain. Since a repeater was installed, misalignment or misconfiguration could be degrading the signal strength.

  Option A: WPS applies to Wi-Fi, not cellular repeaters.

  Option C: Channel frequency might matter for interference, but signal strength is the most direct cause of the described symptoms.

  Option D: Power budget applies to PoE and wired devices, not mobile phones.

  References:

  Domain: Network Troubleshooting -- Wireless/cellular troubleshooting, signal strength impact, user symptoms (battery drain, poor connectivity).

• Question 268:

  A network administrator is preparing new switches that will be deployed to support a network extension project. The lead network engineer has already provided documentation to ensure the switches are set up properly.

  Which of the following did the engineer most likely provide?

  A. Physical network diagram
  B. Site survey reports
  C. Baseline configurations
  D. Logical network diagram
  D. Logical network diagram

• Question 269:

  Which of the following connector types would most likely be used to connect to an external antenna?

  A. BNC
  B. ST
  C. LC
  D. MPO
  A. BNC

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  Explanation

  BNC connectorsare commonly used for coaxial cables, including those connecting to external antennas Wi-in Fi, radio, and surveillance systems.

  Breakdown of Options:

  Option

  A. BNC-Correct answer. Used for coaxial cables wireless and antenna connections in Option

  B. ST-Used for fiber optic cables not antennas Option

  C. LC-A fiber optic connector not for antennas Option

  D. MPO-Used for multi-fiber optic cables not RF antennas

• Question 270:

  A user notifies a network administrator about losing access to a remote file server. The network administrator is able to ping the server and verifies the current firewall rules do not block access to the network fileshare.

  Which of the following tools would help identify which ports are open on the remote file server?

  A. dig
  B. nmap
  C. tracert
  D. nslookup
  B. nmap

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  Explanation

  Nmap (Network Mapper) is a powerful network scanning and reconnaissance tool used to discover hosts and services on a network. It can be used to determine what ports are open and what services are running on those ports on the remote file server. This would help in identifying any accessible services or potential issues with specific ports that might be causing the loss of access.