100-150 Endpoints and Media Types Practice Test 4 — 15 Questions

Question 1

Which endpoint media issue is most likely caused by the use of asymmetric paths in a bi-directional voice call?

Accepted Answer

Increased jitter due to varying path delays in each direction.. Asymmetric routing occurs when packets follow different paths to and from an endpoint. This often causes jitter and latency variations that exceed the capabilities of the endpoint's jitter buffer. Identifying this issue is crucial because it is a network-layer problem that cannot be solved by upgrading phone firmware or codecs, requiring instead a review of the routing protocol design and load balancing configurations.

Answer

One-way audio where the caller cannot hear the callee.

Answer

Ghost calls that register spontaneously on the gateway.

Answer

Registration failure between the endpoint and the Call Agent.

Question 2

Which protocol is primarily used for the delivery of real-time voice and video media streams across a network?

Accepted Answer

RTP (Real-time Transport Protocol). The Real-time Transport Protocol (RTP) is the standard for delivering audio and video over IP networks. Because it operates over UDP, it provides the low-overhead delivery mechanism necessary for real-time applications. Understanding RTP is foundational for network troubleshooting, as most packet analysis of voice media will involve inspecting RTP streams to detect drops, out-of-order delivery, or timestamp mismatches that impact audio clarity.

Answer

SIP (Session Initiation Protocol)

Answer

TCP (Transmission Control Protocol)

Answer

DNS (Domain Name System)

Question 3

A help desk technician is asked to connect a new laptop to the corporate network. The wall jack provides a copper Ethernet connection, and the laptop does not have a built-in RJ-45 port. Which type of adapter should the technician use to provide a wired connection?

Accepted Answer

USB-to-RJ-45 Ethernet adapter. A USB-to-RJ-45 Ethernet adapter is the correct endpoint media because it adds a physical Ethernet interface to a laptop that lacks an integrated RJ-45 port. It allows the laptop to use standard copper cabling and connect to the corporate LAN. The other adapters provide serial, video, or direct-transfer functions, none of which deliver Ethernet connectivity.

Answer

USB-to-VGA display adapter

Answer

USB-to-RS-232 serial adapter

Answer

USB-to-USB null modem cable

Question 4

A network administrator is connecting a Cisco switch to another Cisco switch using a copper cable. The administrator wants to avoid manual crossover configuration and ensure the link works regardless of cable type. Which technology should be enabled on the switch ports?

Accepted Answer

Auto-MDIX. Auto-MDIX is the correct feature because it automatically adjusts the port's transmit and receive pins to match the cable type, whether straight-through or crossover. This eliminates the need for manual crossover cables on switch-to-switch links. Port security, STP, and LACP serve different purposes and do not resolve cable pinout issues.

Answer

Spanning Tree Protocol

Answer

Port security

Answer

Link Aggregation Control Protocol

Question 5

A technician is deploying an IP phone in a small branch office and needs to ensure both voice traffic and the phone's power are delivered over a single Ethernet cable. Which IEEE standard should the technician verify the switch port supports?

Accepted Answer

802.3af. Power over Ethernet lets a single cable carry both data and DC power, eliminating the need for a separate power adapter at the desk. The IEEE 802.3af standard is the baseline PoE specification that supplies enough wattage for standard IP phones and similar low-power endpoints, making it the correct standard to confirm on the switch port.

Answer

802.11ac

Answer

802.1Q

Answer

802.3ad

Question 6

A network technician is terminating a new Cat 6a cable run in an office. The cable will connect a workstation to a wall jack. Which connector type should the technician use to terminate the cable?

Accepted Answer

RJ-45. Twisted-pair copper Ethernet cabling, including Cat 6a, is terminated with RJ-45 connectors. These eight-pin connectors mate with standard Ethernet ports on workstations, switches, and patch panels, supporting the four-pair signaling needed for gigabit and multi-gigabit speeds. Fiber connectors and coaxial connectors serve entirely different media types.

Answer

BNC

Answer

RJ-11

Answer

LC

Question 7

A network administrator is connecting two switches directly using a copper cable. Both switches are modern and support auto-MDI/MDIX. Which cable type is required for this connection?

Accepted Answer

A straight-through cable. Auto-MDI/MDIX eliminates the need to choose between straight-through and crossover copper cables for device-to-device links. When both switches support this feature, a standard straight-through cable is sufficient because the ports negotiate the correct transmit and receive pairing automatically. Crossover cabling is only mandatory when auto-detection is absent on at least one side.

Answer

A rollover cable

Answer

A fiber-optic patch cord

Answer

A crossover cable

Question 8

A network administrator is replacing older copper cables with fiber optic cables to connect two buildings 500 meters apart. Which type of fiber optic cable is best suited for this distance and provides the highest bandwidth over long distances?

Accepted Answer

Single-mode fiber. Single-mode fiber is designed for long-distance, high-bandwidth applications. Its small core eliminates modal dispersion, allowing signals to travel many kilometers without significant loss. Multimode fiber is limited to shorter distances, typically within a campus or data center. Copper cables cannot reach 500 meters at high speeds. Thus, single-mode fiber is the best choice for connecting two buildings 500 meters apart.

Answer

Coaxial cable

Answer

Multimode fiber

Answer

Cat 6a twisted pair

Question 9

A technician is troubleshooting a workstation that cannot connect to the network. The workstation's network interface card (NIC) shows a link light, but no data is being transmitted. The cable is a straight-through Cat 5e patch cord. Which tool should the technician use to verify the cable's pinout and detect any wiring faults?

Accepted Answer

Cable tester. A cable tester is specifically designed to verify the integrity and pinout of network cables. It can detect common wiring faults such as opens, shorts, and crossed pairs that might allow link but prevent data flow. The other tools serve different purposes: tone generators trace cables, loopback plugs test ports, and multimeters check basic electrical properties. Thus, a cable tester is the correct tool for this scenario.

Answer

Loopback plug

Answer

Multimeter

Answer

Tone generator and probe

Question 10

A network administrator is troubleshooting a workstation that cannot connect to the network. The workstation's NIC shows a link light, but the switch port is not forwarding traffic. The administrator suspects a duplex mismatch. Which symptom is most indicative of a duplex mismatch?

Accepted Answer

High number of late collisions and CRC errors. Late collisions and CRC errors are the hallmark of a duplex mismatch. When one side is full-duplex and the other half-duplex, the full-duplex side may transmit while the half-duplex side is sending, causing collisions that are detected late. This results in CRC errors and reduced throughput. The other symptoms are not typical of duplex mismatch.

Answer

Intermittent connectivity with no error counters increasing

Answer

No link light on the switch port

Answer

The switch port shows up/up but MAC address table is empty

Question 11

A network engineer is deploying a wireless network in a warehouse with metal shelving and forklifts. Users report intermittent connectivity and slow speeds. Which phenomenon is most likely causing the signal degradation?

Accepted Answer

Multipath interference. In a warehouse with metal shelving and moving forklifts, radio signals reflect off these surfaces, creating multiple paths to the receiver. This multipath interference causes signal fading, distortion, and intermittent connectivity. Channel overlap is a configuration issue, attenuation is gradual signal loss, and EMI from forklifts is less likely. Therefore, multipath interference is the most probable cause of the reported problems.

Answer

Attenuation

Answer

Electromagnetic interference

Answer

Channel overlap

Question 12

A network administrator is evaluating endpoint media types for a new VoIP deployment. The IP phones will be powered by the access switches and must negotiate power requirements automatically. Which TWO statements correctly describe how Power over Ethernet (PoE) negotiation works between a Power Sourcing Equipment (PSE) switch and a Powered Device (PD) phone? (Choose two.)

Accepted Answer

The PSE applies a low voltage to detect a valid PD signature resistance before supplying full power.. PoE negotiation begins with a physical-layer detection phase where the PSE checks for a valid PD signature resistance, then proceeds to classification. Later standards add LLDP-MED for dynamic power negotiation, allowing the phone and switch to agree on precise power levels. DHCP and manual static budgeting are not part of the PoE power negotiation process, and Gigabit Ethernet supports PoE without limitation.

Answer

The PSE supplies power on the same pairs used for data in 10BASE-T and 100BASE-TX, which is why Gigabit Ethernet cannot support PoE.

Answer

The PD must be manually configured with a static power budget on the switch port before it will receive any power.

Answer

The PD sends a DHCP request to the PSE to request a specific power class before link negotiation.

Question 13

A technician is troubleshooting a workstation that cannot connect to the network. The workstation's network interface card (NIC) shows a solid link light, but the technician cannot ping the default gateway. The technician suspects a duplex mismatch. Which command should the technician use on a Cisco switch to verify the duplex settings of the port connected to the workstation?

Accepted Answer

show interfaces gigabitethernet0/1. The show interfaces gigabitethernet0/1 command provides detailed operational status, including the current duplex and speed, as well as error counters that can confirm a duplex mismatch. The show interfaces status command gives a summary but lacks error details. The show interfaces counters errors command focuses on errors but not duplex. The show running-config shows configured settings, not operational status. Thus, the detailed interface command is best for verifying duplex.

Answer

show running-config interface gigabitethernet0/1

Answer

show interfaces status

Answer

show interfaces counters errors

Question 14

A network engineer is deploying a fiber-optic link between two buildings 550 meters apart. The engineer selects 1000BASE-SX multimode fiber with a wavelength of 850 nm. Which statement accurately describes the expected performance or limitation of this choice?

Accepted Answer

1000BASE-SX supports distances up to 550 meters on 50-micron multimode fiber, so the link should operate correctly if the fiber meets that specification.. 1000BASE-SX is specified for 850 nm transmission over multimode fiber, with a maximum reach of 550 meters on 50-micron multimode fiber. Because the buildings are exactly 550 meters apart, the link is at the limit but still within the standard. The engineer must confirm the fiber core size and modal bandwidth to ensure the link operates reliably.

Answer

1000BASE-SX uses a 1310 nm wavelength and can reach 550 meters on single-mode fiber only.

Answer

1000BASE-SX cannot be used for inter-building links because it is limited to 100 meters regardless of fiber type.

Answer

1000BASE-SX supports distances up to 10 kilometers on single-mode fiber, so the engineer should use single-mode instead.

Question 15

A technician is troubleshooting a workstation that cannot reach the network. The workstation's NIC shows a link light, but the switch port statistics indicate a high number of FCS errors and late collisions. The cable run is approximately 120 meters of Cat 5e UTP. Which is the most likely cause of the problem?

Accepted Answer

The cable exceeds the maximum supported distance for Ethernet, causing signal degradation and errors.. Ethernet over Cat 5e UTP is limited to 100 meters. A 120-meter run exceeds this limit, causing attenuation and signal distortion that produce FCS errors and late collisions. While duplex mismatch can also cause late collisions, the explicitly stated cable length makes the distance violation the most likely and direct cause. The technician should shorten the run or insert a repeater.

Answer

The switch port is configured with port security and has shut down due to a MAC address violation.

Answer

The workstation NIC is configured for half-duplex while the switch port is set to full-duplex.

Answer

The cable is a crossover cable instead of a straight-through cable.