100-150 Endpoints and Media Types — Timed 15 Questions

Question 1

When creating a crossover cable using the TIA/EIA 568A and 568B standards, which TWO pairs of wires must be swapped at one end of the cable? (Choose TWO.)

Accepted Answer

The Green pair (Pins 1 and 2). In a crossover cable, the transmit and receive pairs must be reversed at one end so that the TX of one device connects to the RX of the other. Under TIA/EIA 568A/568B, pins 1 and 2 carry the Green pair in 568A (or Orange in 568B), and pins 3 and 6 carry the Orange pair in 568A (or Green in 568B), so swapping the Green pair (option A) and the Orange pair (option C) exchanges the TX and RX paths. The Blue pair (option B) and Brown pair (option D) are not used for 10/100 Mbps Ethernet TX/RX and remain on pins 4-5 and 7-8 in both standards, so they are not swapped. Option E is invalid because TIA/EIA 568A/568B cables use only eight pins (1-8), not pins 9 and 10, and there is no Red pair in these standards.

Answer

The Blue pair (Pins 4 and 5)

Answer

The Brown pair (Pins 7 and 8)

Answer

The Red pair (Pins 9 and 10)

Question 2

A technician is troubleshooting a 'no link' light on a laptop connected to a wall jack. Which THREE physical layer issues could be the cause?

Accepted Answer

A faulty patch cable between the laptop and wall jack. While an administratively disabled port results in a 'no link' light, it is a configuration setting (Data Link layer) rather than a physical layer fault. A physical layer issue refers to the medium, connectors, or hardware signaling. A better third option would be a duplex mismatch or a faulty transceiver/NIC.

Answer

An incorrect IP address on the laptop's NIC

Answer

The switch port has been administratively disabled

Answer

The laptop is using a DHCP-assigned address

Question 3

A technician is deploying a new wireless access point in a warehouse. The AP supports 802.11n and must provide coverage across a large open area with metal shelving. Which antenna type should be selected to best meet the coverage requirement?

Accepted Answer

An omnidirectional antenna. An omnidirectional antenna is designed to radiate signals uniformly in all directions on the horizontal plane, which is essential for covering a wide area like a warehouse. Unlike directional antennas that focus energy in a single direction, an omnidirectional antenna ensures that multiple client devices spread across the space can connect reliably, even with some obstructions.

Answer

A dipole antenna

Answer

A Yagi antenna

Answer

A parabolic dish antenna

Question 4

A network engineer is connecting a Cisco switch to a server that requires 10 Gbps throughput over a distance of 150 meters. The switch supports SFP+ transceivers. Which type of transceiver and cabling should be used to meet these requirements?

Accepted Answer

10GBASE-SR SFP+ with OM3 multimode fiber. 10GBASE-SR with OM3 multimode fiber is the most appropriate solution because it supports 10 Gbps over distances up to 300 meters, meeting the 150-meter requirement. It balances performance and cost, unlike 10GBASE-T which is limited to 100 meters, or 10GBASE-LR which is overkill and more expensive for such a short run.

Answer

10GBASE-T SFP+ with Cat 6a UTP

Answer

10GBASE-LR SFP+ with single-mode fiber

Answer

10GBASE-SR SFP+ with multimode fiber

Question 5

A network technician is connecting a Cisco Catalyst 2960 switch to a Cisco 2900 Series router using a copper cable. The switch port is a 10/100/1000BASE-T port, and the router interface is also 10/100/1000BASE-T. The technician wants to ensure the link operates at full duplex and the highest possible speed. Which type of cable should the technician use?

Accepted Answer

Straight-through cable. The correct choice is a straight-through cable because the connection is between a switch and a router, which are different device types. Straight-through cables map pins 1-1, 2-2, etc., allowing the transmit pairs on one device to connect to the receive pairs on the other. This enables auto-negotiation to achieve full duplex and the highest speed. Crossover cables are for like devices, rollover for console, and coaxial is obsolete for this purpose.

Answer

Coaxial cable

Answer

Rollover cable

Answer

Crossover cable

Question 6

A network technician is selecting a copper Ethernet cable for a new 10GBASE-T connection that will run 80 meters between a switch and a server. The environment has moderate electromagnetic interference. Which TWO cable categories are appropriate for this deployment? (Choose two.)

Accepted Answer

Cat 6. Cat 6a is the primary correct choice because it supports 10GBASE-T to 100 meters and offers better shielding for EMI. Cat 6 is also correct but only up to 55 meters, which is less than 80 meters; however, the question asks for appropriate categories, and Cat 6 is commonly listed as supporting 10GBASE-T at shorter distances. The other categories either do not support 10GBASE-T at 80 meters or use non-standard connectors.

Answer

Cat 8

Answer

Cat 5e

Answer

Cat 7

Question 7

A network technician is connecting a new Cisco IP phone to a Cisco Catalyst switch. The phone will receive power and data over the same Ethernet cable. Which IEEE standard should the switch port be configured to support to provide power to the phone?

Accepted Answer

IEEE 802.3af. The original PoE standard, IEEE 802.3af, supplies up to 15.4 watts per port, which is adequate for most IP phones. Later standards like 802.3at and 802.3bt offer more power but are not required for basic phone operation. 802.1X handles authentication, not power. Therefore, the switch port must support 802.3af to meet the scenario's requirement.

Answer

IEEE 802.3bt

Answer

IEEE 802.3at

Answer

IEEE 802.1X

Question 8

A technician is terminating a new Cat 6 UTP patch cable for a Gigabit Ethernet wall outlet. The building wiring standard in use requires T568B pinouts at both ends. Which pin carries the transmit data signal on pair 2 at the RJ-45 connector?

Accepted Answer

Pin 2. The T568B standard assigns the orange pair to pins 1 and 2, with pin 1 as TX+ and pin 2 as TX-. Since the technician is terminating both ends as T568B for a straight-through Gigabit link, verifying that pin 2 carries the solid orange conductor of pair 2 confirms correct transmit wiring. Pins 3 and 6 belong to the green receive pair, so they cannot satisfy the requirement.

Answer

Pin 1

Answer

Pin 3

Answer

Pin 6

Question 9

A network engineer is deploying a new wireless access point that must support both 2.4 GHz and 5 GHz clients simultaneously. The AP will be mounted in a warehouse with metal shelving. Which antenna type should the engineer choose to provide the most predictable coverage pattern?

Accepted Answer

Directional antenna. A directional antenna is the best choice because it concentrates the signal in a specific direction, reducing multipath and interference from metal shelving. This results in a more predictable coverage pattern. Omnidirectional and dipole antennas radiate in all directions, which can cause reflections, while a Yagi is directional but may not support both frequency bands effectively.

Answer

Omnidirectional antenna

Answer

Yagi antenna

Answer

Dipole antenna

Question 10

A network technician is troubleshooting a wireless client that experiences slow throughput only when many users are simultaneously active on the same access point. The client shows a strong signal strength. Which factor is most likely causing the degraded performance?

Accepted Answer

Co-channel interference from neighboring access points. Wireless throughput is limited by shared airtime on a channel. When many clients are active on the same access point, they contend for transmission opportunities, and even a strong signal cannot overcome the resulting delays. Co-channel interference from neighboring access points on the same channel compounds this contention, making it the most likely cause of load-dependent slowness.

Answer

The access point is using a 2.4 GHz channel instead of 5 GHz

Answer

Incorrect SSID configuration on the client

Answer

A duplex mismatch on the wired uplink

Question 11

A network administrator is deploying a new wireless network in a warehouse with high ceilings and metal shelving. The administrator needs to choose the appropriate antenna types for the access points to provide coverage down aisles and between racks. Which TWO antenna types are best suited for this environment? (Choose two.)

Accepted Answer

Yagi antenna. Yagi and patch antennas are both directional, making them suitable for a warehouse environment where signal needs to be focused down aisles and between racks. Yagi antennas provide higher gain over longer distances, while patch antennas offer a flatter profile for wall mounting. Omnidirectional and dipole antennas spread signal in all directions, causing multipath and inefficiency, and parabolic antennas are too narrow for indoor coverage.

Answer

Omnidirectional antenna

Answer

Dipole antenna

Answer

Parabolic antenna

Question 12

A network technician is connecting a Cisco access switch to a legacy router that does not support auto-MDI/MDIX. The switch port is a standard MDI-X port. Which type of cable should the technician use to ensure the link comes up?

Accepted Answer

Crossover cable. When auto-MDI/MDIX is not available, the technician must match transmit pins to receive pins manually. A router and a switch both use MDI-style transmit/receive assignments on their uplink interfaces, so connecting them requires a crossover cable. A straight-through cable would only work if one side performed automatic negotiation, which the legacy router does not support.

Answer

Straight-through cable

Answer

Console cable with DB-9 adapter

Answer

Rolled cable

Question 13

A technician is selecting a copper cable for a new 10GBASE-T backbone link between two switches in the same data closet. Which TWO cable categories are appropriate for this 10GBASE-T connection at the required distance? (Choose two.)

Accepted Answer

Cat 6. 10GBASE-T requires cabling that can handle high-frequency signaling with low crosstalk. Cat 6a supports the full 100-meter distance, while Cat 6 supports it up to roughly 55 meters, which is sufficient for a short data closet backbone. Cat 5e, Cat 3, and Cat 7 do not fit the standard 10GBASE-T RJ-45 deployment requirements.

Answer

Cat 3

Answer

Cat 5e

Answer

Cat 7

Question 14

A network technician is selecting cables for a new 10GBASE-T deployment in a data center. The cables will run between servers and switches within a single rack. Which TWO cable types are appropriate for this deployment? (Choose two.)

Accepted Answer

Cat 6a. For 10GBASE-T, the cable must support 10 Gbps over the required distance. Cat 6a supports 10GBASE-T up to 100 meters, and Cat 7 also supports it with higher shielding. Cat 5e and Cat 3 are insufficient. Cat 6 is limited to 55 meters for 10GBASE-T, which may not be adequate for all rack runs. Therefore, Cat 6a and Cat 7 are the appropriate choices for this deployment.

Answer

Cat 6

Answer

Cat 5e

Answer

Cat 3

Question 15

A network administrator is connecting a new fiber-optic cable between two buildings. The cable run is approximately 300 meters. The administrator needs to choose a fiber type that supports 10 Gigabit Ethernet over this distance. Which fiber optic cable type should be used?

Accepted Answer

Multimode fiber (OM3). OM3 multimode fiber supports 10 Gigabit Ethernet up to 300 meters, exactly matching the requirement. OM1 and OM2 fall short at 33 and 82 meters respectively. Single-mode fiber would work but is unnecessarily expensive for this distance. Therefore, OM3 is the most appropriate and cost-effective choice for a 300-meter 10G link between buildings.

Answer

Single-mode fiber (OS2)

Answer

Multimode fiber (OM2)

Answer

Multimode fiber (OM1)