220-1201 Practice Test 48 — 15 Questions

Question 1

A technician is troubleshooting a DHCP issue where clients are not receiving IP addresses. Which port must be open on the firewall for DHCP server communication?

Accepted Answer

67. DHCP servers listen on UDP port 67 for incoming client requests (DHCPDISCOVER, DHCPREQUEST). For the server to receive these messages, the firewall must allow inbound traffic to port 67. Without this port open, the server cannot process client requests, and no IP addresses are assigned.

Answer

68

Answer

53

Answer

123

Question 2

A user complains that their wireless connection drops frequently, but only when they are in the conference room. Other areas of the office have stable connections. What is the most likely cause?

Accepted Answer

The conference room has thick walls or electronic interference that weakens the signal.. The issue is location-specific: the connection drops only in the conference room, while other areas are stable. This strongly points to a local environmental factor, such as thick walls (e.g., concrete or metal) that attenuate the 2.4 GHz or 5 GHz signal, or electronic interference from devices like projectors, fluorescent lights, or microwave ovens. A faulty adapter or overloaded AP would cause problems everywhere, not just in one room.

Answer

The user's laptop has a faulty wireless adapter.

Answer

The access point is overloaded with too many connections.

Answer

The access point's firmware is outdated.

Question 3

A network administrator is deploying a new wireless network in a large office building. They need to ensure seamless roaming for users moving between floors. The building has concrete floors and metal studs. Which hardware configuration will best support this requirement?

Accepted Answer

Deploy thin access points connected to a wireless LAN controller.. Thin access points (APs) are designed to be managed centrally by a Wireless LAN Controller (WLC). The WLC coordinates channel selection, power levels, and client handoffs, enabling seamless roaming across floors. In a building with concrete floors and metal studs, multiple thin APs with controlled overlap ensure consistent coverage and fast roaming without the interference issues that would plague overlapping channels on thick APs.

Answer

Install multiple thick access points with overlapping channels.

Answer

Use a single high-power access point in the center of the building.

Answer

Use mesh access points with wireless backhaul.

Question 4

A technician is configuring a company-issued Android tablet for a field worker. The worker needs to use a specific business app that requires location access to log job sites. What should the technician do to ensure the app works correctly?

Accepted Answer

Grant the location permission when the app requests it.. This question tests understanding of mobile app permissions. For an app that needs location data to function, the technician must grant the location permission when prompted or via settings. Denying or ignoring the permission will prevent the app from accessing location services, leading to malfunction.

Answer

Disable location services to save battery.

Answer

Install a third-party location spoofing app.

Answer

Set the tablet to Airplane mode to prevent network interference.

Question 5

A customer reports that their multifunction printer (MFP) is not scanning to email. The MFP is connected to the network via Ethernet, and other network functions like printing work fine. What is the most likely cause of this issue?

Accepted Answer

The SMTP server settings are incorrect.. Scan to email requires the MFP to communicate with an SMTP server to send the email. Incorrect SMTP server settings are a common misconfiguration that prevents this function while other network services remain operational.

Answer

The MFP is out of toner.

Answer

The network cable is loose.

Answer

The scanner glass is dirty.

Question 6

During a network upgrade, a technician configures a new VoIP phone to use a dedicated VLAN for voice traffic. After connecting the phone to a switch port configured for voice VLAN, the phone powers on but cannot register with the call manager. The switch port is set to trunk mode. Which protocol is essential for the phone to obtain its VLAN assignment?

Accepted Answer

LLDP. Link Layer Discovery Protocol (LLDP) is essential because it allows the switch to inform the VoIP phone of the configured voice VLAN ID. When a switch port is in trunk mode, the phone uses LLDP (specifically LLDP-MED) to learn which VLAN to tag its voice traffic with, enabling it to communicate with the call manager. Without LLDP, the phone would not know which VLAN to use and would fail to register.

Answer

STP

Answer

RSTP

Answer

GVRP

Question 7

A user reports that their smartphone's screen protector has a large bubble in the center and the edges are lifting. They installed it themselves two days ago. What is the most likely cause of this issue?

Accepted Answer

The user did not properly clean the screen before installation.. Screen protector bubbles and lifting edges are almost always caused by improper installation, such as not cleaning the screen thoroughly or not aligning the protector correctly. Even high-quality protectors will fail if the surface isn't perfectly clean and dust-free. The correct answer is improper installation.

Answer

The screen protector is incompatible with the phone model.

Answer

The phone's screen has a manufacturing defect.

Answer

The screen protector is a tempered glass type, which is prone to bubbles.

Question 8

A user's workstation has intermittent connectivity issues. You suspect the Ethernet cable might be damaged or improperly terminated. You need to test the cable for continuity, shorts, and correct pinout. Which tool should you use, and what is a key feature of this tool?

Accepted Answer

Cable tester; it can detect split pairs. A cable tester is the correct tool because it verifies continuity, detects shorts, and confirms the correct pinout (e.g., T568A/B) of an Ethernet cable. A key feature is its ability to detect split pairs, which can cause crosstalk and intermittent connectivity even if continuity appears fine, as the pairs are not properly twisted.

Answer

Toner probe; it can measure signal strength

Answer

Multimeter; it can measure resistance

Answer

Loopback plug; it can simulate network traffic

Question 9

You are setting up a new branch office and need to run Ethernet cables through ceiling plenums. You must ensure the cables meet fire safety codes. Which type of cable should you use, and which tool would you use to verify its integrity after installation?

Accepted Answer

Use plenum-rated cable; verify with a cable tester. Plenum-rated cable is required for installation in ceiling plenums because it is made with low-smoke, fire-retardant materials (e.g., FEP or PVDF) that do not emit toxic fumes or support flame spread, meeting fire safety codes such as NFPA 70 (NEC) Article 800. After installation, a cable tester (e.g., a wiremap tester or certification tool like a Fluke DSX) verifies integrity by checking for continuity, shorts, opens, and proper pin-to-pin wiring per T568A/B standards.

Answer

Use PVC cable; verify with a multimeter

Answer

Use shielded cable; verify with a toner probe

Answer

Use fiber optic cable; verify with a loopback plug

Question 10

A user complains that their new laptop only sees 2.4 GHz Wi-Fi networks, not the 5 GHz network that was previously visible on their old phone. The router is dual-band and configured to broadcast both bands. What is the most likely reason the laptop cannot see the 5 GHz network?

Accepted Answer

The laptop’s wireless adapter does not support 5 GHz frequencies. The most likely reason is that the laptop's wireless adapter only supports 2.4 GHz frequencies. Since the old phone could see the 5 GHz network, the router's 5 GHz radio is functioning correctly, but the laptop's hardware lacks the capability to detect or connect to 5 GHz bands, which is a common limitation in budget or older laptops.

Answer

The router’s 5 GHz radio is set to a channel not supported by the laptop

Answer

The 5 GHz SSID is hidden

Answer

Interference from microwave ovens is blocking the 5 GHz signal

Question 11

A network administrator needs to allow secure remote administration of a router using SSH. The router is configured to use the default SSH port. Which port must be opened on the firewall?

Accepted Answer

22. SSH (Secure Shell) operates on TCP port 22 by default. To allow secure remote administration of the router, the firewall must permit inbound TCP traffic on port 22. This enables encrypted management sessions, unlike Telnet which uses unencrypted port 23.

Answer

23

Answer

161

Answer

443

Question 12

A user says their monitor suddenly turned off and will not power on. The power LED on the monitor is off. They have checked the power cable and it is securely connected. What should the technician do next?

Accepted Answer

Test the power outlet with a known-working device. If the power LED is off and the cable is secure, the next step is to test the power outlet with another device to rule out a dead outlet. This follows a logical troubleshooting process.

Answer

Replace the monitor's internal power supply

Answer

Reseat the video cable connecting the monitor to the PC

Answer

Replace the monitor with a new one

Question 13

A hospital needs to connect multiple buildings across a large campus to share patient records and imaging data. The network must be private, high-speed, and cover the entire campus. Which network type should be implemented?

Accepted Answer

Metropolitan Area Network (MAN). A Metropolitan Area Network (MAN) is the correct choice because it is designed to interconnect multiple locations across a city or large campus, providing private, high-speed connectivity. In this scenario, the hospital requires a network that spans beyond a single building but is confined to a campus-sized area, which fits the MAN scope. Technologies like Metro Ethernet or MPLS can deliver the necessary bandwidth for sharing patient records and imaging data securely.

Answer

Local Area Network (LAN)

Answer

Wide Area Network (WAN)

Answer

Personal Area Network (PAN)

Question 14

A technician is deploying a wireless network in a large warehouse and needs to ensure seamless roaming for handheld scanners as workers move between access points. Which technology should the technician configure to support this requirement?

Accepted Answer

Implement 802.11r Fast Roaming.. 802.11r Fast Roaming (also known as Fast BSS Transition) is the correct technology because it reduces the time required for a client device to re-authenticate and reassociate when moving between access points. In a large warehouse with handheld scanners, this minimizes latency and prevents disconnections during active sessions, ensuring seamless roaming. The other options either address security or basic connectivity but do not specifically optimize the handoff process.

Answer

Enable WPA2-PSK with AES encryption.

Answer

Set all access points to the same SSID and password.

Answer

Use a wireless controller with load balancing.

Question 15

A small office uses a cable internet connection with a DOCSIS 3.0 modem. Users complain that speeds drop significantly during peak evening hours. What is the most likely cause?

Accepted Answer

Neighborhood congestion from shared bandwidth.. DOCSIS 3.0 cable internet uses a shared coaxial line to the neighborhood node. During peak evening hours, many subscribers contend for the same upstream and downstream channels, causing throughput to drop due to congestion. This is a classic symptom of shared bandwidth in cable broadband, not a device-level issue.

Answer

The modem's firmware is out of date.

Answer

The office's router is overheating.

Answer

The ISP is performing maintenance every evening.