Question # 1
technician is troubleshooting a user's laptop that is unable to connect to a corporate server. The technician thinks the issue pertains to routing. Which of the following commands should the technician use to identify the issue? | A. tcpdump | B. dig | C. tracert | D. arp |
C. tracert
The tracert (Traceroute) command is used to determine the path packets take from the source to the destination. It helps in identifying routing issues by showing each hop the packets pass through, along with the time taken for each hop. This command can pinpoint where the connection is failing or experiencing delays, making it an essential tool for troubleshooting routing issues.
References: CompTIA Network+ study materials and common network troubleshooting commands.
Question # 2
Which of the following network cables involves bounding light off of protective cladding? | A. Twinaxial
| B. Coaxial
| C. Single-mode
| D. Multimode |
D. Multimode
Explanation:
Multimode fiber optic cables involve the transmission of light signals that bounce off the
core's cladding as they travel down the fiber. This characteristic differentiates it from singlemode
fiber, where the light travels directly down the fiber without reflecting off the cladding.
Here are some detailed points about multimode fiber cables: -
Construction: Multimode fibers have a larger core diameter, typically 50 or 62.5
microns, compared to single-mode fibers, which have a core diameter of about 9
microns.
-
Light Propagation: The larger core of multimode fiber allows multiple light modes
to propagate. These modes travel at different angles, leading to reflections off the
core-cladding boundary.
-
Distance and Bandwidth: Due to modal dispersion, where different light modes
arrive at the receiver at different times, multimode fibers are suited for shorter
distance applications compared to single-mode fibers. Typical distances are up to
550 meters for 10 Gbps Ethernet using OM4 multimode fiber.
-
Applications: Multimode fibers are commonly used in LANs (Local Area Networks),
data centers, and for shorter distance data transmission due to their costeffectiveness
and ease of installation.
Question # 3
Which of the following should a network administrator configure when adding OT devices to an organization’s architecture?
| A. Honeynet
| B. Data-at-rest encryption
| C. Time-based authentication
| D. Network segmentation
|
D. Network segmentation
Explanation:
Network segmentation involves dividing a network into smaller segments or subnets. This is particularly important when integrating OT (Operational Technology) devices to ensure that these devices are isolated from other parts of the network. Segmentation helps protect the OT devices from potential threats and minimizes the impact of any security incidents. It also helps manage traffic and improves overall network performance.References: CompTIA Network+ study materials.
Question # 4
A newtwork administrator needs to create an SVI on a Layer 3-capable device to separate voice and data traffic. Which of the following best explains this use case?
| A. A physical interface used for trunking logical ports
| B. A physical interface used for management access
| C. A logical interface used for the routing of VLANs
| D. A logical interface used when the number of physical ports is insufficent.
|
C. A logical interface used for the routing of VLANs
Explanation:
An SVI (Switched Virtual Interface) is a logical interface on a Layer 3-capable switch used to route traffic between VLANs. This is particularly useful in environments where voice and data traffic need to be separated, as each type of traffic can be assigned to different VLANs and routed accordingly.
SVI (Switched Virtual Interface): A virtual interface created on a switch for inter-VLAN routing.
VLAN Routing: Enables the routing of traffic between VLANs on a Layer 3 switch, allowing for logical separation of different types of traffic, such as voice and data.
Use Case: Commonly used in scenarios where efficient and segmented traffic management is required, such as in VoIP implementations.
Network References:
CompTIA Network+ N10-007 Official Certification Guide: Discusses VLANs, SVIs, and their applications in network segmentation and routing.
Cisco Networking Academy: Provides training on VLAN configuration and inter-VLAN routing using SVIs.
Network+ Certification All-in-One Exam Guide: Covers network segmentation techniques, including the use of SVIs for VLAN routing.
Question # 5
A small business is deploying new phones, and some of the phones have full HD
videoconferencing features. The Chief Information Officer (CIO)is concerned that the
network might not be able to handle the traffic if it reaches a certain threshold. Which of the
following can the network engineer configure to help ease these concerns? | A. A VLAN with 100Mbps speed limits
| B. An IP helper to direct VoIP traffic | C. A smaller subnet mask
| D. Full duplex on all user ports |
D. Full duplex on all user ports
Explanation: Comprehensive and Detailed Explanation:
Full duplex mode allows devices to send and receive data simultaneously, improving
network performance and reducing congestion, which is critical for VoIP and video
conferencing.
Breakdown of Options:
A. A VLAN with 100Mbps speed limits– VLANs segment traffic but limiting
speedsto100Mbpswouldworsenvideo performance.
B. An IP helper to direct VoIP traffic–IP helper is used for DHCP relay, not for VoIP
optimization.
C. A smaller subnet mask– A smaller subnet reduces IP address availability but
does not improve network performance.
D. Full duplex on all user ports–Correct answer. Full duplex eliminates collisions,
allowing better VoIP and video performance.
Question # 6
A network engineer is completing a wireless installation in a new building. A requirement is
that all clients be able to automatically connect to the fastest supported network. Which of
the following best supports this requirement? | A. Enabling band steering
| B. Disabling the 5GHz SSID
| C. Adding a captive portal
| D. Configuring MAC filtering | E. Configuring MAC filtering |
A. Enabling band steering
Explanation:
Band steering is a feature in wireless networks that encourages dual-band capable devices
to connect to the 5GHz band instead of the 2.4GHz band.
Why Band Steering?
The 5GHz band supports higher speeds and less interference compared to 2.4GHz.
If a device supports both bands, the access point (AP) can "steer" it to connect to 5GHz
instead of 2.4GHz.
This helps ensure users always connect to the fastest available network.
Incorrect Options:
B. Disabling the 5GHz SSID: Would force devices onto 2.4GHz, which is slower and more
congested.
C. Adding a Captive Portal: Used for guest authentication, not for speed optimization.
D. Configuring MAC Filtering: Used for security, not for optimizing network speed.
Question # 7
A storage network requires reduced overhead and increased efficiency for the am out of data being sent. Which of the following should an engineer likely configure to meet these
requirements>? | A. Link speed
| B. Jumbo frames
| C. QoS
| D. 802.1q tagging |
B. Jumbo frames
Explanation:
Jumbo frames are Ethernet frames with a payload greater than the standard maximum
transmission unit (MTU) of 1500 bytes. Configuring jumbo frames can reduce overhead
and increase efficiency in storage networks by allowing more data to be sent in each frame,
thus reducing the number of frames needed to transmit the same amount of data.
Reduced Overhead: By sending larger frames, the relative overhead for headers
and acknowledgments is reduced.
Increased Efficiency: Larger frames mean fewer packets to process, leading to
better utilization of network bandwidth and improved performance in high through put
environments like storage networks.
Configuration: Requires support from all devices in the network path, including
switches and network interface cards (NICs).
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