CompTIA N10-009 Online Practice Questions and Exam Preparation

CompTIA N10-009 Online Questions & Answers

• Question 671:

  After changes were made to a firewall, users are no longer able to access a web server. A network administrator wants to ensure that ports 80 and 443 on the web server are still accessible from the user IP space.

  Which of the following commands is best suited to perfom this testing?

  A. Dig
  B. Ifconfig
  C. Ping
  D. nmap
  D. nmap

• Question 672:

  Which of the following protocols is commonly associated with TCP port 443?

  A. Telnet
  B. SMTP
  C. HTTPS
  D. SNMP
  C. HTTPS

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  Explanation

  TCP port 443 is reserved for HTTPS (Hypertext Transfer Protocol Secure), which uses TLS encryption to secure web traffic. It is the standard port for encrypted web communications.

  Option A: Telnet uses TCP port 23.

  Option B: SMTP commonly uses TCP ports 25, 465, or 587.

  Option D: SNMP typically uses UDP ports 161 (queries) and 162 (traps).

  References:

  Domain: Network Standards, Protocols, and Implementations -- Common ports and services.

• Question 673:

  Which of the following ports is used for secure email?

  A. 25
  B. 110
  C. 143
  D. 587
  D. 587

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  Explanation

  Port 587 is used for secure email submission. This port is designated for message submission by mail clients to mail servers using the SMTP protocol, typically with STARTTLS for encryption. Port 25: Traditionally used for SMTP relay, but not secure and often blocked by ISPs for outgoing mail due to spam concerns. Port 110: Used for POP3 (Post Office Protocol version 3), not typically secured. Port 143: Used for IMAP (Internet Message Access Protocol), which can be secured with STARTTLS or SSL/TLS. Port 587: Specifically used for authenticated email submission (SMTP) with encryption, ensuring secure transmission of email from clients to servers.

  References:

  CompTIA Network+ N10-007 Official Certification Guide: Discusses email protocols and ports, including secure email transmission. Cisco Networking Academy: Provides training on securing email communications and the use of appropriate ports.

  Network+ Certification All-in-One Exam Guide: Explains email protocols, ports, and security considerations for email transmission.

• Question 674:

  A company is deploying wireless access points in a different country.

  Which of the following should be considered FIRST?

  A. WPA3 compatibility
  B. Regulatory compliance
  C. Channel bonding
  D. SSID naming
  B. Regulatory compliance

• Question 675:

  Which of the following would be used to indicate when unauthorized access to physical internal hardware has occurred?

  A. Motion detectors
  B. Radio frequency identification tags
  C. Tamper evident seal
  D. Locking racks
  C. Tamper evident seal

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  Explanation

  A tamper-evident seal is used to indicate when unauthorized access to physical internal hardware has occurred. These seals are designed to break or show visible signs of tampering if someone tries to open or access a piece of equipment or hardware. This provides a visual indication that unauthorized access or tampering has taken place, alerting security personnel to investigate further.

• Question 676:

  A network administrator is managing network traffic so that classified services and applications are prioritized.

  Which of the following technologies should the network administrator use?

  A. Load balancing
  B. Time to live
  C. Quality of service
  D. Content delivery network
  C. Quality of service

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  Explanation

  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.

• Question 677:

  Which of the following connector types is most commonly associated with Wi-Fi antennas?

  A. BNC
  B. SFP
  C. MPO
  D. RJ45
  A. BNC

• Question 678:

  A network administrator replaced a faulty NIC in a printer, but the printer is still not reachable. The printer is configured with the correct IP address, mask, and gateway, and a link light is lit on the switch port that the printer is attached to.

  Which of the following is the best command for the administrator to run first on the switch?

  A. show vlan
  B. show route
  C. show arp
  D. show config
  A. show vlan

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  Explanation

  The best command for the administrator to run first on the switch is show vlan, which displays the VLAN configuration information on the switch, such as the VLAN IDs, names, and ports. The show vlan command can help the administrator to verify if the printer is assigned to the correct VLAN, and if there is any mismatch or misconfiguration that prevents the printer from being reachable. The show route command displays the routing table on the switch, which is not relevant for the printer connectivity, as the printer is configured with the correct gateway. The show arp command displays the ARP cache on the switch, which maps the IP addresses to the MAC addresses of the devices. The show arp command can help the administrator to check if the switch has learned the MAC address of the printer, but it is not the best command to run first, as the ARP cache can be cleared or updated frequently. The show config command displays the running configuration on the switch, which includes the VLAN configuration, but it also includes other information that is not related to the printer issue, such as the hostname, the interface settings, the security settings, and so on. The show config

  command can be overwhelming and time-consuming to analyze, so it is not the best command to run first.

  References:

  1: VLANs and Trunking -N10-008 CompTIA Network+ : 2.3

  2: N10-008 CompTIA Network+ : 5.5

  3: Interface Configurations -N10-008 CompTIA Network+ : 2.3

  4: Configuring VLANs -CompTIA Network+ N10-006 -2.6

• Question 679:

  A user's desk has a workstation and an IP phone. The user is unable to browse the internet on the workstation, but the phone works.

  Which of the following configurations is required?

  A. Voice VLAN
  B. Native VLAN
  C. Data VLAN
  D. Trunk port
  C. Data VLAN

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  Explanation

  If the IP phone works but the workstation doesn't, it indicates that the Voice VLAN is functioning correctly, but the Data VLAN (C) is either misconfigured or missing. The workstation typically connects through the phone, which tags voice and data traffic separately using VLANs.

  Option A. Voice VLANis for the IP phone, which is already working.

  Option B. Native VLANis for untagged traffic on trunk ports, but doesn't control access directly.

  Option D. Trunk portis more relevant to switch interconnections than individual workstation ports.

  References:

  CompTIA Network+ N10-009 Official Objectives: 2.3-Given a scenario, configure and verify VLANs.

• Question 680:

  After a recent merger, a large number of alerts are coming in regarding extremely high utilization.

  Which of the following should be generated to help inform new alerting requirements?

  A. SLA
  B. Network diagram
  C. Baseline
  D. Heat map
  C. Baseline

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  Explanation

  A baseline establishes normal performance levels for network utilization, latency, jitter, and other metrics. After a merger, traffic patterns change, so a new baseline is needed to recalibrate monitoring thresholds and avoid excessive false alerts.

  Option A: SLA defines performance agreements with customers but doesn't adjust alerting.

  Option B: Network diagrams show topology, not traffic norms.

  Option D: Heat maps show wireless coverage, not utilization baselines.

  References:

  Domain: Network Operations -- Baselines, monitoring, alerting, performance tuning.