Practice Free N10-009 Exam Online Questions
Which of the following steps of the troubleshooting methodology comes after testing the theory to determine cause?
- A . Verify full system functionality.
- B . Document the findings and outcomes.
- C . Establish a plan of action.
- D . Identify the problem.
C
Explanation:
The CompTIA Troubleshooting Methodology states that after testing the theory, the next step is to establish a plan of action to resolve the issue.
Troubleshooting Steps:
Identify the problem.
Establish a theory of probable cause.
Test the theory to determine the cause.
Establish a plan of action and implement the solution. ✅ (Correct step)
Verify full system functionality.
Document findings, actions, and outcomes.
Breakdown of Options:
A small company has the following IP addressing strategy:
A user is unable to connect to the company file share server located at 192.168.10.1.
The user’s networking configuration is:
Which of the following will most likely correct the issue?
- A . Changing the IPv4 address to 192.168.10.1
- B . Changing the subnet mask to 255.255.255.0
- C . Changing the DNS servers to internet IPs
- D . Changing the physical address to 7A-01-7A-21-01-50
B
Explanation:
If the user cannot communicate with 192.168.10.1, they might be on a different subnet. Changing the subnet mask to 255.255.255.0 ensures the user and the file server are in the same subnet.
Breakdown of Options:
A network engineer needs to virtualize network services, including a router at a remote branch location.
Which of the following solutions meets the requirements?
- A . NFV
- B . VRF
- C . VLAN
- D . VPC
A
Explanation:
Network Functions Virtualization (NFV): NFV is a technology that virtualizes network services like routing, firewalls, and load balancers. It allows these services to run on virtual machines rather than requiring dedicated hardware. This is ideal for remote branch locations where deploying physical devices is costly and complex.
VRF (B): Virtual Routing and Forwarding is used for segmenting routing tables but does not virtualize services.
VLAN (C): Virtual Local Area Networks help segregate broadcast domains but are unrelated to virtualizing network functions.
VPC (D): Virtual Private Cloud is used for cloud computing but does not pertain to virtualizing network services.
Reference: CompTIA Network+ Official Study Guide, Domain 2.1 (Virtualization and Cloud Concepts).
Which of the following network traffic type is sent to all nodes on the network?
- A . Unicast
- B . Broadcast
- C . Multicast
- D . Anycast
B
Explanation:
Broadcast traffic is sent to all nodes on the network. In a broadcast, a single packet is transmitted to all devices in the network segment. This is commonly used for tasks like ARP (Address Resolution Protocol) requests.
Broadcast Domain: All devices within the same broadcast domain will receive broadcast traffic. Network Types: Ethernet networks commonly use broadcast traffic for certain functions, including network discovery and addressing.
IPv4 Broadcast: An IPv4 broadcast address (e.g., 255.255.255.255) ensures the packet is sent to all devices on the network.
Network
Reference: CompTIA Network+ N10-007 Official Certification Guide: Explains network traffic types, including broadcast, unicast, and multicast.
Cisco Networking Academy: Provides training on network communication methods and traffic types. Network+ Certification All-in-One Exam Guide: Discusses different types of network traffic and their uses in various network scenarios.
Broadcast traffic is essential for network operations that require communication with all nodes, such as ARP requests or DHCP discovery messages.
A network engineer connects a business to a new ISP. A simple ping test to 8.8.8.8 is successful. However, users complain of extreme slowness to any website and periods of no connectivity.
Which of the following is the most likely cause?
- A . Incorrect default gateway
- B . VLAN mismatch
- C . Subnet mask configuration
- D . Duplicate ISP IP address
D
Explanation:
If the business shares or duplicates the ISP-assigned public IP address, routing instability and conflicts will occur. Pinging a public IP like 8.8.8.8 may work (since ICMP can bypass certain conflicts), but browsing websites (which requires stable sessions and return traffic) will fail intermittently.
A company recently experienced outages of one of its critical, customer-facing applications. The root cause was an overutilized network router, but the Chief Technology Officer is concerned that the support staff was unaware of the issue until notified by customers.
Which of the following is the best way to address this issue in the future?
- A . Packet capture
- B . SNMP
- C . Syslog collector
- D . SIEM
B
Explanation:
The best answer is SNMP (Simple Network Management Protocol). SNMP enables monitoring of network devices (routers, switches, firewalls, servers) and provides performance data such as CPU usage, bandwidth utilization, and interface status. In this scenario, if SNMP monitoring had been in place, administrators would have received alerts that the router was overutilized before customers noticed outages.
Which of the following is used to describe the average duration of an outage for a specific service?
- A . RPO
- B . MTTR
- C . RTO
- D . MTBF
B
Explanation:
MTTR (Mean Time to Repair) is the average time it takes to repair a system or service after a failure.
It helps in measuring the downtime and planning recovery processes.
Newly crimped 26ft (8m) STP Cat 6 patch cables were recently installed in one room to replace cables that were damaged by a vacuum cleaner. Now, users in that room are unable to connect to the network. A network technician tests the existing cables first. The 177ft (54m) cable that runs from the core switch to the access switch on the floor is working, as is the 115ft (35m) cable run from the access switch to the wall jack in the office.
Which of the following is the most likely reason the users cannot connect to the network?
- A . Mixed UTP and STP cables are being used.
- B . The patch cables are not plenum rated.
- C . The cable distance is exceeded.
- D . An incorrect pinout on the patch cable is being used.
D
Explanation:
An incorrect pinout on the patch cable could prevent network connectivity due to mismatched wiring. Even if the cables are the correct length and type, a pinout issue can cause continuity problems and prevent data transmission. Proper crimping with the correct pinout is essential for network cables to function. (Reference: CompTIA Network+ Study Guide, Chapter on Network Media and Topologies)
A network engineer is designing an internal network that needs to support both IPv4 and IPv6 routing.
Which of the following routing protocols is capable of supporting both IPv4 and IPv6?
- A . OSPFv3
- B . RIPv2
- C . BGP
- D . EIGRP
D
Explanation:
EIGRP (Enhanced Interior Gateway Routing Protocol) supports bothIPv4 and IPv6. While OSPFv3 is specific to IPv6 and RIPv2 only supports IPv4, EIGRP was extended to handle dual-stack environments efficiently.
Reference: Section 2.1 C Characteristics of Routing Technologies C “EIGRP”
Which of the following steps in the troubleshooting methodology comes after using a top-to-top bottom examination of the OSI model to determine cause?
- A . Test in the theory
- B . Establish a plan of action
- C . Verify full system functionality
- D . Identify the problem