CompTIA N10-009 Online Practice Questions and Exam Preparation

CompTIA N10-009 Online Questions & Answers

• Question 321:

  Which of the following is most commonly associated with many systems sharing one IP address in the public IP-addressing space?

  A. PAT
  B. NAT
  C. VIP
  D. NAT64
  A. PAT

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  Explanation

  Port Address Translation (PAT) allows multiple internal devices to share a single public IP address by assigning each device a unique port number. This is the most common method used in environments where many systems need internet access but there are limited public IP addresses.

• Question 322:

  Which of the following uses the longest prefix match to determine an exit interface?

  A. ARP table
  B. MAC address table
  C. Routing table
  D. Netstat table
  C. Routing table

• Question 323:

  A network deployment engineer is deploying a new single-channel 10G optical connection.

  Which of the following optics should the engineer MOST likely use to satisfy this requirement?

  A. QSFP
  B. QSFP+
  C. SFP
  D. SFP+
  D. SFP+

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  Explanation

  SFP+ is a type of optical transceiver that supports 10G single-channel transmission over fiber optic cables. SFP+ stands for small form-factor pluggable plus, and it is compatible with SFP slots on switches and routers.

• Question 324:

  A network technician wants to find the shortest path from one node to every other node in the network.

  Which of the following algorithms will provide the FASTEST convergence time?

  A. A static algorithm
  B. A link-state algorithm
  C. A distance-vector algorithm
  D. A path-vector algorithm
  B. A link-state algorithm

• Question 325:

  Which of the following involves an attacker traversing from one part of a network to another part that should be inaccessible?

  A. MAC flooding
  B. DNS poisoning
  C. VLAN hopping
  D. ARP spoofing
  C. VLAN hopping

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  Explanation

  VLAN hopping allows an attacker to send traffic into another VLAN without authorization, often by impersonating a switch and negotiating a trunk link. This lets the attacker traverse into normally inaccessible VLANs.

  Option A: MAC flooding disrupts switch operations but does not cross VLANs.

  Option B: DNS poisoning corrupts name resolution.

  Option D: ARP spoofing reroutes local traffic but doesn't grant VLAN traversal.

  References:

  Domain: Network Security -- VLAN attacks, unauthorized lateral movement.

• Question 326:

  A technician completed troubleshooting and was able to fix an issue.

  Which of the following is the BEST method the technician can use to pass along the exact steps other technicians should follow in case the issue arises again?

  A. Use change management to build a database
  B. Send an email stating that the issue is resolved.
  C. Document the lessons learned
  D. Close the ticket and inform the users.
  C. Document the lessons learned

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  Explanation

  Documenting the lessons learned is the best method for passing along the exact steps other technicians should follow in case the issue arises again. Lessons learned are the knowledge and experience gained from completing a project or solving a problem. Documenting the lessons learned helps to capture the best practices, challenges, solutions, and recommendations for future reference and improvement. Documenting the lessons learned can also help to update the knowledge base, standard operating procedures, or policies related to the issue.

  References:

  [CompTIA Network+ Certification Exam Objectives], Lessons Learned: Definition & Examples for Project Managers

• Question 327:

  A customer wants to separate the finance department from the marketing department. The network administrator suggests segmenting the existing Class C network into two sections and readdressing all devices appropriately.

  Which of the following subnet masks should the network administrator use?

  A. /24
  B. /25
  C. /26
  D. /27
  B. /25

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  Explanation

  The correct answer is /25, which is the appropriate subnet mask for dividing a network into two equal subnets.

  A /24 network provides 256 total addresses (254 usable). Borrowing one host bit results in a /25 subnet mask, creating two subnets. Each subnet provides 128 total addresses and 126 usable addresses.

  A /24 does not create subnetting.

  A /26 creates four subnets, which exceeds the requirement.

  A /27 creates eight subnets, which further reduces available host capacity per subnet.

  Therefore, /25 is the correct and most efficient choice.

• Question 328:

  Which protocol provides accurate and consistent time synchronization across network devices?

  A. SNMP
  B. DNS
  C. NTP
  D. SIP
  C. NTP

• Question 329:

  Which of the following cloud deployment models is most commonly associated with multitenancy and is generally offered by a service provider?

  A. Private
  B. Community
  C. Public
  D. Hybrid
  C. Public

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  Explanation

  The correct answer is public cloud. In public cloud models, a provider (such as AWS, Azure, or Google Cloud) hosts infrastructure and services that are shared across multiple customers, known as multitenancy. Each tenant is logically isolated, but physical infrastructure is shared, allowing providers to achieve economies of scale.

  Option A: Private cloud is dedicated to one organization, not multitenant.

  Option B: Community cloud is shared among organizations with common interests, but it's less common than public multitenancy.

  Option D: Hybrid cloud combines private and public but does not define tenancy alone.

  Public cloud services are the most cost-effective and scalable because they spread costs across many customers, but they require strong security and isolation to protect tenants.

  References:

  Domain: Networking Concepts -- Cloud models, multitenancy, public vs private.

• Question 330:

  A network administrator notices uncommon communication between VMs on ephemeral ports on the same subnet. The administrator is concerned about that traffic moving laterally within the network.

  Which of the following describes the type of traffic flow the administrator is analyzing?

  A. East-west
  B. Point-to-point
  C. Horizontal-scaling
  D. Hub-and-spoke
  A. East-west

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  Explanation

  When traffic moves laterally between VMs within the same network or subnet, it is known as east-west traffic. This contrasts with north-south traffic, which refers to communication between internal and external networks.

  Breakdown of Options:

  Option

  A. East-west-Correct answer. This refers to traffic between internal servers or VMs, which is a common security concern. Option

  B. Point-to-point-Point-to-point describes a direct connection between two devices, but does not specifically define lateral movement.

  Option C. Horizontal-scaling-This refers to adding more instances or nodes in cloud computing, unrelated to traffic flow.

  Option D. Hub-and-spoke-This network topology describes a centralized design, not lateral traffic.