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質問 # 103
Which of the following steps of the troubleshooting methodology should a technician take to confirm a theory?
- A. Determine any changes.
- B. Duplicate the problem.
- C. Gather information.
- D. Identify the symptoms.
正解：B
解説：
* Troubleshooting Methodology:
* Troubleshooting involves a systematic approach to diagnosing and resolving issues. It typically includes steps such as identifying symptoms, gathering information, formulating and testing theories, and implementing solutions.
* Confirming a Theory:
* Duplicate the Problem:To confirm a theory, the technician should reproduce the problem in a controlled environment. This helps verify that the identified cause actually leads to the observed issue.
* Verification:By duplicating the problem, the technician can observe the issue firsthand, validate the hypothesis, and rule out other potential causes.
* Comparison with Other Steps:
* Identify the Symptoms:Initial step to understand what the problem is, not specifically for confirming a theory.
* Gather Information:Involves collecting data and details about the issue, usually done before formulating a theory.
* Determine Any Changes:Involves checking for recent changes that could have caused the issue, a part of the information-gathering phase.
* Implementation:
* Use similar equipment or software in a test environment to recreate the issue.
* Observe the results to see if they match the original problem, thereby confirming the theory.
References:
* CompTIA Network+ study materials on troubleshooting methodologies and best practices.
質問 # 104
A support agent receives a report that a remote user's wired devices are constantly disconnecting and have slow speeds. Upon inspection, the support agent sees that the user's coaxial modern has a signal power of
-97dB.
- A. Lowering the network speed
- B. Moving the devices closer to the modern
- C. Switching the devices to wireless
- D. Removing any spliters connecte to the line
正解：D
解説：
A signal power of -97dB indicates a very weak signal, which can cause connectivity issues and slow speeds.
Splitters on a coaxial line can degrade the signal quality further, so removing them can help improve the signal strength and overall connection quality.
* Signal Quality: Splitters can reduce the signal strength by dividing the signal among multiple lines, which can be detrimental when the signal is already weak.
* Direct Connection: Ensuring a direct connection from the modem to the incoming line can maximize signal quality and reduce potential points of failure.
Network References:
* CompTIA Network+ N10-007 Official Certification Guide: Discusses troubleshooting connectivity issues and the impact of signal strength on network performance.
* Cisco Networking Academy: Provides insights on maintaining optimal signal quality in network setups.
* Network+ Certification All-in-One Exam Guide: Covers common network issues, including those related to signal degradation and ways to mitigate them.
質問 # 105
Which of the following most likely determines the size of a rack for installation? (Select two).
- A. Cooling fan speed
- B. Hard drive size
- C. Switch depth
- D. Server height
- E. KVM size
- F. Outlet amperage
正解：C
解説：
* Understanding Rack Size Determination:
* The size of a rack for installation is determined by the dimensions of the equipment to be housed in it, primarily focusing on the depth and height of the devices.
* Switch Depth:
* Depth of Equipment:The depth of network switches and other rack-mounted devices directly influences the depth of the rack. If the equipment is deeper, a deeper rack is required to accommodate it.
* Industry Standards:Most racks come in standard depths, but it is essential to match the depth of the rack to the deepest piece of equipment to ensure proper fit and airflow.
* Server Height:
* Height of Equipment:The height of servers and other devices is measured in rack units (U), where 1U equals 1.75 inches. The total height of all equipment determines the overall height requirement of the rack.
* Rack Units:A rack's height is typically described in terms of the number of rack units it can accommodate, such as 42U, 48U, etc.
* Why Other Options are Less Relevant:
* KVM Size:While important for management, KVM (Keyboard, Video, Mouse) switches do not typically determine rack size.
* Hard Drive Size:Individual hard drives are installed within servers or storage devices, not
* directly influencing rack dimensions.
* Cooling Fan Speed:Fan speed affects cooling but not the physical size of the rack.
* Outlet Amperage:Power requirements do not determine rack dimensions but rather the electrical infrastructure supporting the rack.
References:
* CompTIA Network+ study materials on rack installation and equipment sizing.
質問 # 106
A VoIP phone is plugged in to a port but cannot receive calls. Which of the following needs to be done on the port to address the issue?
- A. Disable VLANs.
- B. Tag the traffic to voice VLAN.
- C. Configure the native VLAN.
- D. Trunk all VLANs on the port.
正解：B
解説：
* Understanding VoIP and VLANs:
* VoIP (Voice over IP) phones often use VLANs (Virtual Local Area Networks) to separate voice traffic from data traffic for improved performance and security.
* Tagging Traffic to Voice VLAN:
* Voice VLAN Configuration:The port on the switch needs to be configured to tag traffic for the specific voice VLAN. This ensures that voice packets are prioritized and handled correctly.
* VLAN Tagging:VLAN tagging allows the switch to identify and separate voice traffic from other types of traffic on the network, reducing latency and jitter for VoIP communications.
* Comparison with Other Options:
* Trunk all VLANs on the port:Trunking all VLANs is typically used for links between switches, not for individual device ports.
* Configure the native VLAN:The native VLAN is for untagged traffic and does not address the need for separating and prioritizing voice traffic.
* Disable VLANs:Disabling VLANs would mix voice and data traffic, leading to potential performance issues and lack of traffic separation.
* Implementation:
* Configure the switch port connected to the VoIP phone to tag the traffic for the designated voice VLAN, ensuring proper network segmentation and quality of service.
References:
* CompTIA Network+ study materials on VLAN configuration and VoIP implementation.
質問 # 107
SIMULATION
Users are unable to access files on their department share located on flle_server 2. The network administrator has been tasked with validating routing between networks hosting workstation A and file server 2.
INSTRUCTIONS
Click on each router to review output, identity any Issues, and configure the appropriate solution If at any time you would like to bring back the initial state of trie simulation, please click the reset All button;
正解：
解説：
See the solution configuration below in Explanation.
質問 # 108
SIMULATION
Users are unable to access files on their department share located on flle_server 2. The network administrator has been tasked with validating routing between networks hosting workstation A and file server 2.
INSTRUCTIONS
Click on each router to review output, identity any Issues, and configure the appropriate solution If at any time you would like to bring back the initial state of trie simulation, please click the reset All button;
正解：
解説：
See the solutio nconfiguration below in Explanation
Explanation:
質問 # 109
After installing a series of Cat 8 keystones, a data center architect notices higher than normal interference during tests. Which of the following steps should the architect take to troubleshoot the issue?
- A. Connect the RX/TX wires to different pins.
- B. Use passthrough modular crimping plugs instead of traditional crimping plugs.
- C. Check to see if the end connections were wrapped in copper tape before terminating.
- D. Run a speed test on a device that can only achieve 100Mbps speeds.
正解：C
質問 # 110
Which of the following is the most closely associated with segmenting compute resources within a single cloud account?
- A. Network security group
- B. VPC
- C. laaS
- D. Hybrid cloud
正解：B
質問 # 111
A network manager wants to implement a SIEM system to correlate system events. Which of the following protocols should the network manager verify?
- A. DNS
- B. LDAP
- C. NTP
- D. DHCP
正解：C
解説：
Role of NTP (Network Time Protocol):
NTP is used to synchronize the clocks of network devices to a reference time source. Accurate time synchronization is critical for correlating events and logs from different systems.
Importance for SIEM Systems:
Event Correlation: SIEM (Security Information and Event Management) systems collect and analyze log data from various sources. Accurate timestamps are essential for correlating events across multiple systems.
Time Consistency: Without synchronized time, it is challenging to piece together the sequence of events during an incident, making forensic analysis difficult.
Comparison with Other Protocols:
DNS (Domain Name System): Translates domain names to IP addresses but is not related to time synchronization.
LDAP (Lightweight Directory Access Protocol): Used for directory services, such as user authentication and authorization.
DHCP (Dynamic Host Configuration Protocol): Assigns IP addresses to devices on a network but does not handle time synchronization.
Implementation:
Ensure that all network devices, servers, and endpoints are synchronized using NTP. This can be achieved by configuring devices to use an NTP server, which could be a local server or an external time source.
Reference:
CompTIA Network+ study materials on network protocols and SIEM systems.
質問 # 112
A client with a 2.4GHz wireless network has stated that the entire office is experiencing intermittent issues with laptops after the WAP was moved. Which of the following is the most likely reason for these issues?
- A. The signal is reflecting too much.
- B. A microwave is in the office.
- C. The network uses a non-overlapping channel.
- D. The network has excessive noise.
正解：B
解説：
Microwaves are known to interfere with the 2.4GHz frequency, which is the same frequency used by many wireless networks. This can cause signal degradation and intermittent connectivity issues, especially if the WAP is placed near such devices.
質問 # 113
Which of the following is a characteristic of the application layer?
- A. It encrypts data in transit.
- B. It performs address translation.
- C. It relies upon other layers for packet delivery.
OB. It checks independently for packet loss.
正解：C
解説：
* Introduction to OSI Model:
* The OSI model is a conceptual framework used to understand network interactions in seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
* Application Layer:
* The application layer (Layer 7) is the topmost layer in the OSI model. It provides network services directly to end-user applications. This layer facilitates communication between software applications and lower layers of the network protocol stack.
* Reliance on Other Layers:
* The application layer relies on the transport layer (Layer 4) for data transfer across the network.
The transport layer ensures reliable data delivery through protocols like TCP and UDP.
* The network layer (Layer 3) is responsible for routing packets to their destination.
* The data link layer (Layer 2) handles node-to-node data transfer and error detection.
* The physical layer (Layer 1) deals with the physical connection between devices.
* Explanation of the Options:
* A. It relies upon other layers for packet delivery:This is correct. The application layer depends on the lower layers (transport, network, data link, and physical) for the actual delivery of data packets.
* B. It checks independently for packet loss:This is incorrect. Packet loss detection is typically handled by the transport layer (e.g., TCP).
* C. It encrypts data in transit:This is incorrect. Encryption is typically handled by the presentation layer or at the transport layer (e.g., TLS/SSL).
* D. It performs address translation:This is incorrect. Address translation is performed by the network layer (e.g., NAT).
* Conclusion:
* The application layer's primary role is to interface with the end-user applications and ensure that data is correctly presented to the user. It relies on the underlying layers to manage the actual data transport and delivery processes.
References:
* CompTIA Network+ guide covering the OSI model and the specific roles and functions of each layer (see pageRef 10†How to Use Cisco Packet Tracer).
質問 # 114
A network technician needs to resolve some issues with a customer's SOHO network. The customer reports that some of the PCs are not connecting to the network, while others appear to be working as intended.
INSTRUCTIONS
Troubleshoot all the network components.
Review the cable test results first, then diagnose by clicking on the appropriate PC, server, and Layer 2 switch.
Identify any components with a problem and recommend a solution to correct each problem.
If at any time you would like to bring back
the initial state of the simulation, please
click the Reset All button.
正解：
解説：
See the answer and solution below:
質問 # 115
A network administrator configured a router interface as 10.0.0.95 255.255.255.240. The administrator discovers that the router is not routing packets to a web server with IP 10.0.0.81/28. Which of the following is the best explanation?
- A. Thesubnet is in a private address space.
- B. TheIP address spaceis a class A network.
- C. Theweb server Is In adifferent subnet.
- D. Therouter interface isa broadcast address.
正解：D
解説：
* Understanding Subnetting:
* The subnet mask 255.255.255.240 (or /28) indicates that each subnet has 16 IP addresses (14 usable addresses, 1 network address, and 1 broadcast address).
* Calculating the Subnet Range:
* Subnet Calculation:For the IP address 10.0.0.95 with a /28 subnet mask:
* Network address: 10.0.0.80
* Usable IP range: 10.0.0.81 to 10.0.0.94
* Broadcast address: 10.0.0.95
* Router Interface Configuration:
* Broadcast Address Issue:The IP address 10.0.0.95 is the broadcast address for the subnet
10.0.0.80/28. Configuring a router interface with the broadcast address will cause routing issues as it is not a valid host address.
* Comparison with Other Options:
* The web server is in a different subnet:The web server (10.0.0.81) is within the same subnet range (10.0.0.80/28).
* The IP address space is a class A network:While 10.0.0.0 is a Class A network, this does not explain the routing issue caused by the broadcast address.
* The subnet is in a private address space:The private address space designation (RFC 1918) does not impact the routing issue related to the broadcast address configuration.
* Resolution:
* Reconfigure the router interface with a valid host IP address within the usable range, such as
10.0.0.94.
References:
* CompTIA Network+ study materials on subnetting and IP address configuration.
質問 # 116
After installing a series of Cat 8 keystones, a data center architect notices higher than normal interference during tests. Which of the following steps should the architect take to troubleshoot the issue?
- A. Connect the RX/TX wires to different pins.
- B. Use passthrough modular crimping plugs instead of traditional crimping plugs.
- C. Check to see if the end connections were wrapped in copper tape before terminating.
- D. Run a speed test on a device that can only achieve 100Mbps speeds.
正解：C
解説：
* Importance of Proper Termination:
* Cat 8 cabling requires precise termination practices to ensure signal integrity and reduce interference. One common requirement is to wrap the end connections in copper tape to maintain shielding and reduce electromagnetic interference (EMI).
* Interference Troubleshooting:
* Interference in high-frequency cables like Cat 8 can be caused by improper shielding or grounding. Checking the end connections for proper wrapping in copper tape is a crucial step.
* Why Other Options are Less Likely:
* Passthrough modular crimping plugs:Not specifically related to interference issues and are typically used for ease of cable assembly.
* Connecting RX/TX wires to different pins:Would likely result in no connection or incorrect data transmission rather than interference.
* Running a speed test on a device that can only achieve 100Mbps speeds:This would not diagnose interference and would not provide relevant information for Cat 8 cabling rated for higher speeds.
* Corrective Actions:
* Verify that all end connections are properly wrapped with copper tape before termination.
* Ensure that the shielding is continuous and properly grounded throughout the installation.
* Retest the cabling for interference after making corrections.
References:
* CompTIA Network+ study materials and structured cabling installation guides.
質問 # 117
A company's marketing team created a new application and would like to create a DNS record for newapplication.comptia.org that always resolves to the same address as www.comptia.org. Which of the following records should the administrator use?
- A. SOA
- B. CNAME
- C. NS
- D. MX
正解：B
解説：
A CNAME (Canonical Name) record is used in DNS to alias one domain name to another. This means that newapplication.comptia.org can be made to resolve to the same IP address as www.comptia.org by creating a CNAME record pointing newapplication.comptia.org to www.comptia.org. SOA (Start of Authority) is used for DNS zone information, MX (Mail Exchange) is for mail server records, and NS (Name Server) is for specifying authoritative DNS servers.
Reference:
The DNS section of the CompTIA Network+ materials describes the use of CNAME records for creating domain aliases.
質問 # 118
A network administrator performed upgrades on a server and installed a new NIC to improve performance.
Following the upgrades, usera are unable to reach the server. Which of the following is the most likely reason.
- A. The PoE power budget was exceeded.
- B. A port security violation occured.
- C. TX/RX was transposed.
- D. An incorrect cable type was installed.
正解：D
解説：
When a network administrator installs a new Network Interface Card (NIC) and users are unable to reach the server, one of the common issues is the use of an incorrect cable type. Network cables must match the specifications required by the NIC and the network infrastructure (e.g., Cat5e, Cat6 for Ethernet).
* NIC Compatibility: The new NIC might require a specific type of cable to function properly. Using a cable not rated for the NIC's required speeds or capabilities can result in connectivity issues.
* Cable Standards: Different NICs and network devices might need different cabling standards (straight-through vs. crossover cables, or specific fiber optic types).
* Connection Types: Ensuring that the cable connectors are appropriate for the NIC ports (e.g., RJ45 for Ethernet, LC connectors for fiber optics).
Network References:
* CompTIA Network+ N10-007 Official Certification Guide: Discusses network cabling standards and NIC specifications.
* Cisco Networking Academy: Provides insights into cabling and NIC configurations for optimal network performance.
* Network+ Certification All-in-One Exam Guide: Offers comprehensive details on troubleshooting network connectivity issues, including cabling problems.
質問 # 119
A network administrator is connecting two Layer 2 switches in a network. These switches must transfer data in multiple networks. Which of the following would fulfill this requirement?
- A. 802.1Q tagging
- B. Jumbo frames
- C. Native VLAN
- D. Link aggregation
正解：A
解説：
802.1Q tagging, also known as VLAN tagging, is used to identify VLANs on a trunk link between switches.
This allows the switches to transfer data for multiple VLANs (or networks) over a single physical connection.
This method ensures that traffic from different VLANs is properly separated and managed across the network.
References: CompTIA Network+ study materials.
質問 # 120
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