CompTIA CompTIA Certifications N10-008 Questions & Answers

• Question 481:

  A network administrator is troubleshooting a client's device that cannot connect to the network. A physical inspection of the switch shows the RJ45 is connected. The NIC shows no activity lights. The network administrator moves the device to another location and connects to the network without issues. Which of the following tools would be the BEST option for the network administrator to use to further troubleshoot?

  A. Tone generator

  B. Multimeter

  C. Optical time-domain reflectometer

  D. Cable tester

  Correct Answer: D

• Question 482:

  An engineer is using a tool to run an ICMP sweep of a network to find devices that are online. When reviewing the results, the engineer notices a number of workstations that are currently verified as being online are not listed in the report.

  The tool was configured to scan using the following information:

  Network address: 172.28.16.0

  CIDR: /22

  The engineer collected the following information from the client workstation:

  1.

  IP address: 172.28.17.206

  2.

  Subnet mask: 255.255.252.0

  Which of the following MOST likely explains why the tool is failing to detect some workstations?

  A. The scanned network range is incorrect.

  B. The subnet mask on the client is misconfigured.

  C. The workstation has a firewall enabled.

  D. The tool is unable to scan remote networks.

  Correct Answer: C

  A firewall is a device or software that filters and controls the incoming and outgoing network traffic based on predefined rules. A firewall can block ICMP packets, which are used for ping and other diagnostic tools. If the workstation has a firewall enabled, it may not respond to the ICMP sweep and appear as offline. The engineer should check the firewall settings on the workstation and allow ICMP traffic if needed. References: Network+ Study Guide Objective 4.1: Given a scenario, use the appropriate tool.

• Question 483:

  A network administrator is investigating reports about network performance and finds high utilization on a switch uplink. The administrator is unsure whether this is an anomaly or normal behavior that will require an upgrade to resolve. Which of the following should the administrator reference to gain historical perspective?

  A. Device configuration review

  B. ARP table export

  C. Service-level agreement

  D. Network performance baseline

  Correct Answer: D

  A network performance baseline is a set of metrics that represents the normal or expected behavior of a network under various conditions and scenarios. A network performance baseline can help a network administrator to investigate reports about network performance by comparing the current metrics with the historical metrics and identifying any deviations or anomalies. A network performance baseline can also help to plan and justify network upgrades by showing the trends and patterns of network utilization and performance over time. A device configuration review is a process that involves checking and verifying the settings and parameters of a network device, such as a switch, router, firewall, or server. A device configuration review can help a network administrator to troubleshoot network issues by finding and fixing any errors, inconsistencies, or vulnerabilities in the device configuration. A device configuration review can also help to ensure compliance with security policies and best practices by applying the latest updates and patches to the device. An ARP table export is a file that contains the contents of the ARP (Address Resolution Protocol) table of a network device. The ARP table is a data structure that maps IP addresses to MAC addresses on a local network. An ARP table export can help a network administrator to monitor and manage the network devices on a local network by showing their IP addresses and MAC addresses. An ARP table export can also help to detect and prevent ARP spoofing attacks by identifying any duplicate or malicious entries in the ARP table. A service-level agreement (SLA) is a contract that defines the expectations and responsibilities of both parties in terms of service quality, availability, performance, and response time. An SLA can help a network administrator to provide and maintain a satisfactory level of service to the customers or users of the network by setting and measuring specific goals and metrics. An SLA can also help to resolve any disputes or issues that may arise between the service provider and the service consumer by establishing clear terms and conditions for the service delivery.

• Question 484:

  A large number of PCs are obtaining an APIPA IP address, and a number of new computers were added to the network. Which of the following is MOST likely causing the PCs to obtain an APIPA address?

  A. Rogue DHCP server

  B. Network collision

  C. Incorrect DNS settings

  D. DHCP scope exhaustion

  Correct Answer: D

  B and C are irrelevant to the topic.

  A rogue DHCP server would be handing out addresses from outside to APIPA range, which would most likely cause IP Conflict, which is when 2 or more devices on the same network shares the same IP Address.

  D is correct because when you run out of Addresses to hand out, the DHCP can't do anything and so APIPA takes over and hands out an random address from within the APIPA range.

• Question 485:

  A network administrator notices excessive wireless traffic occurring on an access point after normal business hours. The access point is located on an exterior wall. Which of the following should the administrator do to limit wireless access outside the building?

  A. Set up a private VLAN.

  B. Disable roaming on the WAP.

  C. Change to a directional antenna.

  D. Stop broadcasting of the SSID.

  Correct Answer: C

  Changing to a directional antenna can help limit wireless access outside the building. Directional antennas focus the wireless signal in a specific direction, reducing the signal strength outside the targeted area. This can help prevent unauthorized access from outside the building and reduce the potential for interference from other sources.

• Question 486:

  Which of the following can be used to limit the ability of devices to perform only HTTPS connections to an internet update server without exposing the devices to the public internet?

  A. Allow connections only to an internal proxy server.

  B. Deploy an IDS system and place it in line with the traffic.

  C. Create a screened network and move the devices to it.

  D. Use a host-based network firewall on each device.

  Correct Answer: A

  Allow connections only to an internal proxy server.

  By allowing connections only to an internal proxy server, you can limit the devices to perform only HTTPS connections to the internet update server without exposing them to the public internet. The proxy server can be configured to allow only HTTPS connections to the specific update server while blocking all other traffic, providing a secure and controlled connection.

• Question 487:

  Which of the following layers is where TCP/IP port numbers identify which network application is receiving the packet and where it is applied?

  A. 3

  B. 4

  C. 5

  D. 6

  E. 7

  Correct Answer: B

• Question 488:

  A technician thinks one of the router ports is flapping. Which of the following available resources should the technician use in order to determine if the router is flapping?

  A. Audit logs

  B. NetFlow

  C. Syslog

  D. Traffic logs

  Correct Answer: C

  Syslog is a protocol that allows network devices to send event messages to a centralized server or console for logging and analysis1. Syslog can help a technician to determine if a router port is flapping by providing timestamps, severity levels, and descriptions of the events that occur on the router, such as interface up or down, link state change, or error messages. Syslog can also help to identify the cause and frequency of the port flapping and troubleshoot the issue. Audit logs are records of actions or events that occur on a system or network, such as user login, file access, configuration change, or policy violation. Audit logs can help to monitor and verify the activities and behaviors of users, devices, or applications on a system or network. Audit logs can also help to detect and investigate security incidents, compliance issues, or performance problems. However, audit logs do not provide detailed information about router port flapping. NetFlow is a protocol that collects and analyzes network traffic data for monitoring and troubleshooting purposes2. NetFlow can help to identify the sources, destinations, volumes, and types of traffic on a network. NetFlow can also help to optimize network performance, security, and capacity planning. However, NetFlow does not provide detailed information about router port flapping. Traffic logs are records of network traffic that pass through a device or application, such as a firewall, proxy, or web server. Traffic logs can help to monitor and filter the network traffic based on rules or policies. Traffic logs can also help to detect and prevent malicious traffic, such as malware, attacks, or unauthorized access. However, traffic logs do not provide detailed information about router port flapping.

• Question 489:

  A network engineer is investigating reports of poor performance on a videoconferencing application. Upon reviewing the report, the engineer finds that available bandwidth at the WAN connection is low. Which of the following is the MOST appropriate mechanism to handle this issue?

  A. Traffic shaping

  B. Flow control

  C. NetFlow

  D. Link aggregation

  Correct Answer: A

  Traffic shaping is a network management technique that controls the flow of network traffic to ensure that certain types of traffic are given higher priority over others. In this case, by implementing traffic shaping, the network engineer can prioritize and allocate sufficient bandwidth for the videoconferencing application to ensure its performance and quality.

• Question 490:

  A network engineer is designing a wireless network that has the following requirements:

  1.

  Network speed must be higher than 100Mbps

  2.

  Must use the 2.4GHz and 5GHz bands

  Which of the following 802.11 standards should the engineer select?

  A. 802.11a

  B. 802.11b

  C. 802.11g

  D. 802.11n

  Correct Answer: D

  802.11n is a wireless standard that supports up to 600 Mbps data rate and operates in both the 2.4 GHz and 5 GHz frequency bands. 802.11n uses multiple-input multiple-output (MIMO) technology to increase the number of spatial streams and improve the wireless performance and range. 802.11n meets the requirements of the wireless network design. References: Network+ Study Guide Objective 1.6: Explain the functions of network services.