CompTIA N10-009 Online Practice Questions and Exam Preparation

CompTIA N10-009 Online Questions & Answers

• Question 91:

  Which of the following DNS records maps an alias to a true name?

  A. AAAA
  B. NS
  C. TXT
  D. CNAME
  D. CNAME

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  Explanation

  A CNAME (Canonical Name) record is a type of DNS (Domain Name System) record that maps an alias name to a canonical or true domain name. For example, a CNAME record can map blog.example.com to example.com, which means that blog.example.com is an alias of example.com. A CNAME record is useful when you want to point multiple subdomains to the same IP address, or when you want to change the IP address of a domain without affecting the subdomains.

• Question 92:

  A network administrator is reviewing switchport metrics. The port shows a high number of giant frames.

  Which of the following is the MOST likely cause?

  A. The connected device is exceeding the configured MTU.
  B. The connected device is sending too many packets
  C. The switchport has been up for too long
  D. The connected device is receiving too many packets.
  E. The switchport does not have enough CRCs
  A. The connected device is exceeding the configured MTU.

• Question 93:

  A network engineer needs to enable device monitoring using authentication and encryption.

  Which of the following protocols offers this option?

  A. ESP
  B. SNMPv3
  C. NetFIow
  D. SSLv3
  B. SNMPv3

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  Explanation

  SNMPv3 is a protocol that offers device monitoring using authentication and encryption. SNMP stands for Simple Network Management Protocol, and it is a standard way of collecting and organizing information about network devices, such as routers, switches, servers, printers, and so on. SNMPv3 is the latest version of SNMP, and it provides enhanced security features, such as data integrity, data origin authentication, data confidentiality, and access control. SNMPv3 can use different algorithms to encrypt and authenticate the communication between the network management system and the network devices.

• Question 94:

  Which of the following does BGP use for loop avoidance?

  A. Autonomous system path
  B. Peer autonomous system
  C. Autonomous system length
  D. Public autonomous system
  A. Autonomous system path

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  Explanation

  The correct answer is Autonomous system path because BGP (Border Gateway Protocol) prevents routing loops by using the AS_PATH attribute. According to CompTIA Network+ (N10-009) objectives under routing protocols, BGP is a path vector protocol used to exchange routing information between autonomous systems (AS) on the internet.

  When a BGP router advertises a route, it includes its autonomous system number (ASN) in the AS_PATH attribute. As the route passes through additional autonomous systems, each AS appends its own ASN to the path. If a BGP router receives a route advertisement that already contains its own ASN in the AS_PATH list, it recognizes this as a loop and rejects the route. This mechanism effectively prevents routing loops across large-scale networks such as the internet.

  Option B (Peer autonomous system) refers to neighboring BGP routers but does not describe the loop prevention mechanism.

  Option C (Autonomous system length) relates to path selection metrics, as shorter AS_PATH lengths are generally preferred, but this is not the loop avoidance function itself.

  Option D (Public autonomous system) is not a loop prevention mechanism.

  Therefore, BGP uses the AS_PATH attribute for loop avoidance.

• Question 95:

  A network administrator wants to install new VoIP switches in small network closet but is concerned about the current heat level of the room.

  Which of the following should the administrator take into consideration before installing the new equipment?

  A. The power load of the switches
  B. The humidity in the room
  C. The fire suppression system
  D. The direction of airflow within the switches
  D. The direction of airflow within the switches

• Question 96:

  Ten new laptops are added to an existing network, and they can only communicate with one another.

  An administrator reviews documentation and sees the following:

  Subnet: 10.8.100.0/24

  Scope: 10.8.100.50 - 10.8.100.150

  Reservation: 10.8.100.151 - 10.8.100.175

  A technician scans the network and receives the following results:

  IP addresses used: 10.8.100.45 - 10.8.100.175

  Which of the following should be done to ensure connectivity on all laptops?

  A. Increase the scope to 10.8.100.35 - 10.8.100.150
  B. Increase the scope to 10.8.100.40 - 10.8.100.150
  C. Increase the scope to 10.8.100.40 - 10.8.100.175
  D. Increase the scope to 10.8.100.50 - 10.8.100.175
  D. Increase the scope to 10.8.100.50 - 10.8.100.175

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  Explanation

  The issue indicates that the DHCP scope is too limited and does not align with the active address usage.

  Expanding the scope to include the full active range ensures devices can obtain valid IP addresses.

  Option C is correct because it extends the scope to include all currently used addresses without overlapping unintended lower ranges unnecessarily.

  Option D incorrectly overlaps the reservation range, which should remain excluded from the dynamic pool.

• Question 97:

  Which of the following topologies uses a central device to connect all nodes?

  A. Bus
  B. Ring
  C. Star
  D. Mesh
  C. Star

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  Explanation

  A star topology connects all devices to a central device, such as a switch or hub. All communication passes through this central point, making management and troubleshooting easier. Bus topology uses a single backbone, ring topology connects devices in a circular fashion, and mesh topology connects devices with multiple redundant paths. The star topology is widely used in modern Ethernet networks due to its simplicity and scalability.

• Question 98:

  After extremely high temperatures cause a power outage, the servers automatically shut down, even though the UPSs for the servers still have hours of battery life.

  Which of the following should a technician recommend?

  A. Include backup power for air-conditioning units
  B. Configure door locks to automatically lock during power outages
  C. Increase UPS battery size
  D. Add an IoT-enabled thermostat
  A. Include backup power for air-conditioning units

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  Explanation

  Servers shut down due to overheating, not loss of electrical power. Although UPS units had battery life, without cooling systems (HVAC/air conditioning) running on backup power, server rooms overheated. Backup power for air-conditioning is essential in data center design.

  Option B: Door locks are unrelated to server shutdown.

  Option C: Increasing UPS capacity won't help cooling.

  Option D: IoT thermostats may monitor temperature but won't prevent overheating.

  References:

  Domain: Network Infrastructure -- Environmental controls, power redundancy, HVAC systems.

• Question 99:

  A technician is implementing a new SD-WAN device with a default configuration. The technician receives a URL via email and connects the new device to the internet to complete the installation.

  Which of the following is this an example of?

  A. SASE device installation
  B. Zero-touch provisioning
  C. Infrastructure as code
  D. Configuration management
  B. Zero-touch provisioning

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  Explanation

  This process describes Zero-touch provisioning (ZTP), where a device automatically pulls its configuration from a cloud controller or URL once connected to the internet. It's common in SD-WAN and modern network appliances.

  Option A. SASE(Secure Access Service Edge) refers to cloud-delivered network security, not a provisioning method.

  Option C. Infrastructure as codeautomates infrastructure deployment using code, but this scenario specifically fits ZTP.

  Option D. Configuration managementtracks and maintains system configurations but doesn't describe the installation process.

  References:

  CompTIA Network+ N10-009 Official Objectives: 4.3?Explain remote access methods and automation.

• Question 100:

  Which of the following is a cost-effective advantage of a split-tunnel VPN?

  A. Web traffic is filtered through a web filter.
  B. More bandwidth is required on the company's internet connection.
  C. Monitoring detects insecure machines on the company's network.
  D. Cloud-based traffic flows outside of the company's network.
  D. Cloud-based traffic flows outside of the company's network.

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  Explanation

  A split-tunnel VPN allows some traffic to be routed through the VPN while other traffic goes directly to the internet. This setup offers several advantages, with a primary one being cost-effectiveness due to cloud-based traffic not consuming company bandwidth.

  Bandwidth Utilization: Split-tunnel VPNs reduce the amount of traffic passing through the company's network, freeing up bandwidth for other uses.

  Performance: By allowing internet-bound traffic to bypass the VPN, it can reduce latency and improve the performance for users accessing cloud services directly.

  Cost Savings: Reduced load on the company's VPN infrastructure can lead to lower costs in terms of both hardware and bandwidth.

  References:

  CompTIA Network+ N10-007 Official Certification Guide: Covers VPN types, including split-tunnel configurations and their advantages. Cisco Networking Academy: Discusses VPN technologies and the benefits of split-tunneling. Network+ Certification All-in-One Exam Guide: Provides detailed information on VPN setups, including the cost-effectiveness of split-tunnel VPNs. By allowing cloud-based traffic to flow outside the company's network, a split-tunnel VPN optimizes resource usage and enhances the overall network performance without incurring extra costs for bandwidth.