100-150 Endpoints and Media Types Practice Test 3 — 15 Questions

Question 1

Refer to the exhibit. A workstation is experiencing intermittent connectivity and slow network speeds. Based on the provided CLI output, what is the most likely cause of the performance issue?

Accepted Answer

A duplex mismatch between the switch and the host. A duplex mismatch occurs when one side of a link is set to full-duplex while the other is set to half-duplex. This leads to the half-duplex side detecting collisions late in the frame transmission process, while the full-duplex side records CRC errors because the incoming frames are interrupted or corrupted by the collision attempts.

Answer

A faulty SFP module in the switch

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Excessive cable length beyond 100 meters

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Electromagnetic interference from nearby power lines

Question 2

A technician is installing a new set of outdoor wireless access points. Which TWO factors are most likely to cause signal attenuation or interference for these endpoints?

Accepted Answer

Thick concrete walls and metal structures. Option A is correct because thick concrete walls and metal structures are dense physical obstructions that absorb, reflect, and scatter RF energy, causing significant signal attenuation, especially at higher frequencies like 5 GHz and 6 GHz. Option C is correct because 2.4 GHz cordless phones and microwave ovens operate in or near the 2.4 GHz ISM band and emit RF energy that overlaps with WLAN channels, producing co-channel and adjacent-channel interference. Option B is not a factor because Category 6a cabling is a wired Ethernet medium for the backhaul and does not radiate or attenuate wireless signals in a way that affects RF propagation. Option D is not a factor because PoE+ (802.3at) is simply a power-delivery standard over Ethernet and does not cause RF attenuation or interference. Option E is not a factor because an LC-to-LC fiber patch cord carries optical signals for wired backhaul and is immune to RF interference and does not affect wireless signal quality.

Answer

The use of Category 6a cabling for the backhaul

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Configuring the access point for PoE+ (802.3at)

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Using an LC-to-LC fiber patch cord

Question 3

A company is upgrading its office network to support 10 Gbps speeds to the desktop over existing copper cabling distances of up to 100 meters. Which cable category is the minimum requirement for this objective?

Accepted Answer

Category 6a. Category 6a (augmented Cat6) is the minimum copper cabling standard that supports 10GBASE-T over the full 100-meter distance. Cat6 can support 10 Gbps but only up to 55 meters, and Cat5e is limited to 2.5/5 Gbps at 100 m. Cat6a extends the usable bandwidth to 500 MHz and is specifically designed for 10GBASE-T at 100 meters.

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Category 5e

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Category 6

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Category 3

Question 4

An administrator needs to deploy several new IP cameras in a parking lot. The cameras require 25 Watts of power each and are connected to a switch 80 meters away. Which technology must the switch support on its ports?

Accepted Answer

802.3at (PoE+). 802.3at (PoE+) delivers up to 30 W per port (25.5 W at the device after cable loss), which comfortably covers the 25 W requirement of each camera. It also supports the 80-meter distance because PoE standards are designed for standard Ethernet cabling up to 100 meters. 802.3af would be insufficient at 15.4 W, and while 802.3bt would also work, it is overkill and not the minimum required.

Answer

802.3af (PoE)

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802.3bt (UPOE+)

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Passive PoE (24V)

Question 5

In a high-density data center, a technician needs to connect a server to a fiber patch panel using a small form factor connector that supports a push-pull locking mechanism. Which connector should be used?

Accepted Answer

LC (Lucent Connector). Connector types are a vital part of media selection in modern networking. Small form factor connectors allow for higher port density on networking equipment. Choosing the correct connector ensures physical compatibility with transceivers and patch panels while providing the mechanical security needed for high-availability data center environments.

Answer

ST (Straight Tip)

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SC (Subscriber Connector)

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RJ-45

Question 6

A network technician is installing network drops in a factory with heavy machinery that generates significant electromagnetic interference (EMI). Which cable type would best protect the data from corruption?

Accepted Answer

STP (Shielded Twisted Pair). Electromagnetic interference can severely degrade network performance by introducing noise into copper cables. In environments like factories where high-voltage equipment is present, standard unshielded cabling is insufficient. Technicians must select cables with extra shielding to block external noise and maintain the integrity of the data signals.

Answer

UTP (Unshielded Twisted Pair)

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Plenum-rated UTP

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Category 5e Patch Cable

Question 7

When connecting a modern PC directly to a modern Cisco switch port, the technician uses a standard straight-through cable and the link comes up immediately. Which feature enabled this connection to work?

Accepted Answer

Auto-MDIX. Historically, connecting like-devices required crossover cables, while unlike-devices used straight-through cables. Modern networking equipment simplifies this with a feature that automatically detects the required cable type and adjusts the internal transmit and receive pairs accordingly, allowing for greater flexibility and fewer specialized cables in a technician's kit.

Answer

Full-Duplex Negotiation

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PoE Autonegotiation

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CSMA/CD

Question 8

Refer to the exhibit. Based on the JSON configuration for the switch port, what type of endpoint is most likely connected to this interface?

Accepted Answer

A Cisco IP Phone with a PC attached. Specific port configurations often reveal the type of endpoint connected. In this case, the presence of both a data VLAN and a voice VLAN, combined with the 'power_inline' setting, strongly indicates a device that handles both voice and data traffic while requiring power from the switch.

Answer

A high-speed network printer

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A wireless access point in bridge mode

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A server hosting virtual machines

Question 9

A technician is terminating a UTP cable. One end is terminated using the T568A standard, and the other end is terminated using the T568B standard. What type of cable has been created?

Accepted Answer

Crossover cable. A crossover cable is created when one end uses T568A pinout and the other uses T568B, which swaps the transmit and receive pairs (pins 1&2 with 3&6). This allows two like devices (e.g., switch-to-switch or PC-to-PC) to communicate without a crossover-capable port. The mismatched standards on each end is the defining characteristic of a crossover cable.

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Straight-through cable

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Rollover cable

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Console cable

Question 10

A network designer is choosing between SFP and SFP+ transceivers for a new switch deployment. Which TWO statements correctly describe the differences and compatibility between these media modules?

Accepted Answer

SFP modules typically support speeds up to 1 Gbps. Option A is correct because SFP (Small Form-factor Pluggable) transceivers are specified for Gigabit Ethernet and lower rates, typically up to 1 Gbps, making them the standard choice for 1000BASE-X/SX/LX/T connections. Option B is correct because SFP+ is the enhanced variant standardized for 10 Gbps Ethernet (10GBASE-SR/LR/ER and DAC), which is its primary design purpose. Option C is wrong because SFP+ in an SFP slot is not guaranteed; the slot must explicitly support 10 Gbps and often requires the same form factor with matching electrical characteristics, so it will not 'always' work. Option D is wrong because SFP modules support fiber connectors such as LC (and sometimes SC), plus copper variants like 1000BASE-T use RJ-45, so RJ-45 is not exclusive. Option E is wrong because SFP+ modules exist for both single-mode and multimode fiber (e.g., 10GBASE-SR for MMF, 10GBASE-LR for SMF), so single-mode-only is inaccurate.

Answer

An SFP+ module will always work in a standard SFP slot

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SFP modules use RJ-45 connectors exclusively

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SFP+ modules are only compatible with single-mode fiber

Question 11

A technician needs to connect a laptop to a Cisco router's console port to perform initial configuration. Which cable should be used for this task?

Accepted Answer

Rollover cable. A rollover cable (also called a console cable) is specifically wired to connect a computer's serial port (via a DB-9 or USB adapter) to a Cisco router's console port (RJ-45). The pinout is reversed end-to-end, which is why it is called a rollover cable. It is the standard cable for out-of-band initial configuration and password recovery.

Answer

Straight-through Ethernet cable

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Crossover Ethernet cable

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Single-mode fiber patch cord

Question 12

While testing a new 100-meter copper cable run, the technician notices that the signal is very weak at the far end, resulting in intermittent drops. What is the most likely cause of this signal weakening?

Accepted Answer

Attenuation. Attenuation is the weakening of a signal as it travels over distance through a medium. In copper cables, signal loss increases with length and frequency, so a 100-meter run may experience significant attenuation, causing weak signal and intermittent drops. This is the most likely cause of the described symptom.

Answer

Crosstalk

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Dispersion

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Refraction

Question 13

An endpoint is experiencing high latency and jitter during a VoIP call, but data traffic remains stable. Which QoS mechanism should be verified on the local switch port to ensure voice media frames are prioritized correctly?

Accepted Answer

Verify the ingress port trust state is configured for DSCP or CoS.. Voice traffic is highly sensitive to delay, jitter, and packet loss. Prioritizing voice packets via Class of Service or Differentiated Services Code Point (DSCP) tagging ensures that these frames bypass standard data queues. Verifying the trust state on the access port is critical, as it confirms the switch honors the classification assigned by the endpoint, preventing the media traffic from being relegated to the best-effort queue.

Answer

Enable port-security on the voice VLAN.

Answer

Increase the maximum transmission unit size on the interface.

Answer

Disable Spanning Tree Protocol on the voice port.

Question 14

Which characteristic best describes a softphone endpoint compared to a dedicated hardware-based IP phone?

Accepted Answer

Softphones are platform-independent applications running on general-purpose hardware.. Softphones are software applications residing on general-purpose computing devices, offering significant flexibility in deployment and updates. Because they share hardware resources like CPU and RAM with the OS, their performance is inherently dependent on the underlying system state. Understanding this distinction is vital for troubleshooting, as softphone issues often stem from local system resource contention rather than network-layer signaling or voice-specific hardware configuration errors.

Answer

Softphones require a dedicated physical Power over Ethernet switch port.

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Softphones always offer superior voice quality due to hardware acceleration.

Answer

Softphones lack support for standard SIP signaling protocols.

Question 15

Which TWO of the following are primary benefits of using G.729 audio codec for voice traffic in bandwidth-constrained environments? (Choose two)

Accepted Answer

It significantly reduces the required bandwidth per voice call.. G.729 is a highly efficient compression algorithm designed to minimize bandwidth usage for voice communication. By reducing the payload size significantly compared to G.711, it allows more concurrent calls over limited WAN links. Recognizing codec efficiency is essential for network engineers, as improper codec selection can lead to link saturation, dropping packets, and severely degrading user experience during peak business hours.

Answer

It provides the highest possible audio fidelity for high-end telepresence.

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It is natively supported by every legacy analog endpoint without an adapter.

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It lowers the processing overhead on the gateway's DSP hardware.