CompTIA CompTIA Certifications N10-009 Questions & Answers

• Question 81:

  A network technician added a new workstation to the network and needs to make a custom, shielded cable that is 492ft (150m) with both ends wired to TIA/EIA-568A standards. The workstation is not establishing a link to the switchport. Which of the following is the cause of the issue?

  A. Cable shielding

  B. Attenuation

  C. Incorrect pinout

  D. Near-end crosstalk

  Correct Answer: B

• Question 82:

  A user cannot connect to the network, although others in the office are unaffected. The network technician sees that the link lights on the NIC are not on. The technician needs to check which switchport the user is connected to, but the cabling is not labeled. Which of the following is the best way for the technician to find where the computer is connected?

  A. Look up the computer's IP address in the switch ARP table.

  B. Use a cable tester to trace the cable.

  C. Look up the computer's MAC address in the switch CAM table.

  D. Use a tone generator to trace the cable.

  Correct Answer: D

• Question 83:

  A Chief Information Officer is concerned about environmental issues in the data center at corporate headquarters. Which of the following are the most common sensors installed in a data center? (Choose two.)

  A. Carbon monoxide

  B. Air flow

  C. Flooding

  D. Humidity

  E. Electrical

  F. Temperature

  Correct Answer: DF

• Question 84:

  After installing a new 6E wireless router in a small office, a technician notices that some wireless devices are not able to achieve the rated speeds. Which of the following should the technician check to troubleshoot the issue? (Choose two.)

  A. Client device compatibility

  B. Back-end cabling

  C. Weather phenomena

  D. Voltage source requirements

  E. Interference levels

  F. Processing power

  Correct Answer: AE

• Question 85:

  Users are reporting issues with connecting to the wireless router. The technician discovers neighboring wireless APs that are not part of the network are on the same 5GHz frequency. Which of the following best describes the issue?

  A. Distance limitation

  B. Absorption

  C. Signal-to-noise ratio

  D. Interference

  Correct Answer: D

• Question 86:

  Which of the following kinds of targeted attacks uses multiple computers or bots to request the same resource repeatedly?

  A. On-path

  B. DDoS

  C. ARP spoofing

  D. MAC flooding

  Correct Answer: B

  A DDoS makes the most sense because in a DDoS attack, the threat actor uses multiple computers that are infected to constantly make requests to a server which overwhelms it and causes network interruption.

• Question 87:

  A network administrator for a small office is adding a passive IDS to its network switch for the purpose of inspecting network traffic. Which of the following should the administrator use?

  A. SNMP trap

  B. Port mirroring

  C. Syslog collection

  D. API integration

  Correct Answer: B

  Port mirroring (also known as SPAN - Switched Port Analyzer) is the process of forwarding a copy of network packets from one port on a network switch to another port, where the packets can be analyzed. In this scenario, the network administrator should use port mirroring to send a copy of the network traffic to the passive IDS (Intrusion Detection System) for inspection without interrupting the normal flow of traffic on the network. This allows the IDS to monitor the network traffic and detect any suspicious or malicious activity.

• Question 88:

  An IT administrator is creating an alias to the primary customer's domain. Which of the following DNS record types does this represent?

  A. CNAME

  B. MX

  C. A

  D. PTR

  Correct Answer: A

  A CNAME (Canonical Name) record is used in the Domain Name System (DNS) to create an alias that points to another domain name, which is often referred to as the canonical domain name. This allows you to have multiple domain names pointing to the same IP address without having to create an A record for each one. It's commonly used to associate new subdomains with an existing domain's DNS records.

• Question 89:

  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

  Correct Answer: B

  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.

• Question 90:

  Which of the following ports is a secure protocol?

  A. 20

  B. 23

  C. 443

  D. 445

  Correct Answer: C