Comp TIA Core 1

tcp20

FTP server

udp161/162

SNMP (agent/manager)

udp69

TFTP

What is the command line prompt to fix “operating system not found” after installing a second drive

bootrec /fixmbr

tcp21

FTP client

tcp22

SSH

tcp23

Telnet

tcp25

SMTP

tcp587

SMTPS

tcp/udp53

DNS

udp67

DHCP server

udp68

DHCP client

tcp80

HTTP

tcp443

HTTPS

tcp110

POP3

tcp143

IMAP (Insecure)

tcp993

IMAP (Secure)

tcp/udp137

NetBIOS Name Service

udp138

NetBIOS Datagram Service

tcp139

NetBIOS Session Service

tcp/udp445

SMB/CIFS

tcp389

LDAP

tcp636

LDAPS

tcp3389

RDP

What do you check when a battery is draining quick when not in heavy use and warm to the touch

Excessive background application activity

What should you do before replacing a broken screen

Backup data

What is the first troubleshooting step when testing if a device is charging properly

Check cable and adapter for physical damage

What is the best tool to use to check for power delivery issues

USB Multimeter

Is it best to regularly allow the battery to fully discharge before recharging it to preserve the lifespan of the battery

No

What is the best troubleshooting step to take if a device is frequently losing Wi-Fi connection or cannot connect

Restart the devices W-Fi adapter to reset the connection

What do you check when checking for a device that is intermittently losing Wi-Fi connection

1. Move closer to Wi-Fi router or access point

2. Restart Wi-Fi adapter

3. Check for and reduce Wi-Fi interference from other devices

4. Forget and reconnect to network

What step do you check if a device has no cellular signal and cannot call or text

Toggle airplane mode on and off to reestablish signal

What should you do to minimize water damage

1. Leave device powered off until dry

2. Remove battery if possible

3. Disconnect external cables or accessories

4. Remove SIM card and memory card if accessible

What are the best practices for drying a smartphone

1. Apply desiccant-based drying methods to remove moisture

2. Keep the device off for 24-48 hours

3. Place device in a sealed bag with silica gel packets

What can prevent overheating

1. Keeping device out of intense heat

2. Using an original or certified charger

3. Closing unused background apps

4. Reduce brightness

5. Enable built-in power-saving

6. Keep device OS and apps up to date

What can reduce the risk of digitizer issues

1. Avoid dropping device or excessive pressure

2. Use a high-quality case and screen guard

3. Keep the device away from moisture and extreme temps

What is the first step after dropping a device to fix touchscreen issues

Power cycle the device

What could help troubleshoot a non-responsive touchscreen

1. Perform a soft reset

2. Remove screen protector

3. Boot into safe mode

4. Perform a factory reset after backing up data

What is the next step after thinking a USB port is physically damaged

Test with a known working cable

What are some symptoms that indicate malware on a mobile device

1. Frequent pop-ups

2. Unauthorized activity

3. Unusual performance issues

What is the best approach for eliminating malware

Factory reset

What is a good way to reduce malware risk

Only install apps from designated app stores (Google Play, Apple’s App Store)

What is a common fix for cursor drift

Calibration

What is the first thing to check when you are unable to install apps

Check available storage

What must be changed to allow an app to be installed for testing if it is blocked by security settings

Enable the “Install unknown apps” or “Unknown sources” settings

What is the most likely cause for users not being able to install app updates or download new ones

Policy enforcement of an MDM

What is the first thing to check if a stylus isn’t working

Check stylus battery

What do you check if a stylus is working intermittently but works with finger input

Inspect stylus tip for damage or wear

What is the first thing to check if a new Bluetooth device isn’t appearing

Is the device in pairing mode

What factors can contribute to unexpected performance drops on a mobile device

1. Outdated OS software

2. Too many background apps

3. Malware

4. Excessive app data

What is the cause of an app taking really long to launch

Heavy CPU load or insufficient memory

What can cause connectivity issues with Wi-Fi

Physical obstructions or electronic interference

What tool measures signal strength and dead zones

Wi-Fi analyzer

What can remedy unstable wireless connection even after restarting the system

Update the wireless adapter drive

What steps can help resolve intermittent wireless connectivity caused by interference

Switching frequency bands or changing the wireless channel

What can cause speed transfer limitations

Older cabling not supporting the higher transfer rates

What symptoms indicate a slow network is caused by congestion

Slowness is noticeable across multiple devices and only during busy periods

What can cause high latency and lag spikes

Background processes or applications

What is the cause of limited network connectivity on a device in the 169.254.x.x IP range

DHCP

What action should you take to troubleshoot a limited connectivity in Windows with no active network connection

Verify network adapter status and check physical network connection

What is the problem if you can ping an IP address but not the domain name

DNS

What is variation in packet delay

Jitter

What network application types are most sensitive to jitter

Real-time

What can cause a VoIP call to hear your own voice with a slight delay

High latency

What causes choppy or distorted audio during a VoIP call

Jitter

What is the primary purpose of a jitter buffer in VoIP systems

To even out packet delays

What is the condition where a network port light rapidly alternates between up and down states loosing and regaining connection

Port Flapping

What is the primary causes of port flapping

1. Mismatched speed and duplex settings

2. Loose, faulty, or unsupported cabling

Network issues directly linked to port flapping

Intermittent connectivity and degraded data transfer speeds

What is the first step to take when troubleshooting port flapping

Check physical connections

What conditions lead to increased latency

Network congestion

Physical distance

Wireless interference and signal degradation

Outdated or inefficient network hardware

What solutions decrease network latency

1. Using wired connections

2. Reducing network congestion

3. Reducing physical distance

4. Upgrading hardware

What cabling is most susceptible to external interference

UTP

What cabling provides immunity against external interference

Fiber optic

What can result in a network authentication failure even if username and password are correct

1. Expired user password

2. User account locked out

3. Disabled or deleted user account

4. Time synchronization issues

What do you do if you realize the issue is on the WAN side

Contact the ISP

What causes vertical lines appearing on each output page of a laser printer

Imaging drum

Which step would resolve vertical lines on an inkjet printer

Cleaning printheads

What causes garbled characters on printers

Faulty or outdated drivers, corrupted print jobs, or communication errors.

What can cause paper jams

1. Obstructed paper path

2. Curled paper

3. Incorrect paper type or size

4. High humidity

5. Overloaded trays

6. Dirty or worn pickup rollers

What are best practices when clearing paper jams

1. Open all access doors

2. Inspect all areas of the paper path

3. Check for worn or dirty pickup rollers

4. Power cycle printer after

Common cause of faded laser printer printouts

Low or uneven toner

Common cause of faded inkjet printer printouts

Low ink or clogged printhead

What can cause paper to not feed

1. Overloaded tray

2. Foreign objects in paper path

3. Worn or dirty feed rollers

4. Paper quality or type issues

What can cause a printer to pull two pages at once causing jams

1. Paper quality

2. Worn or faulty separation pad

3. Overfilled tray

4. Worn or dirty pickup rollers

5. Humidity

What should a technician do first to fix stuck jobs in queue

Restart the print spooler service

Common cause for speckling on prints in a laser printer

1. Leaking toner

2. Paper dust, debris. or excess toner buildup

3. Contaminated or faulty imaging drum

What can cause dark spots on inkjet printer printouts

1. Excess paper dust, debris, or ink residue on the paper path

2. Partial blockages on printhead nozzles

3. Leaking ink

What causes double or echo images in a laser printer

residual latent images on imaging drum being reused in same print cycle

What causes grinding noises in an inkjet printer

1. Worn, damaged or misaligned paper feed rollers

2. Small paper pieces or foreign objects in paper path

3. Printhead carriage mechanism malfunctions

What can be done to troubleshoot echo images in a laser printer

1. Check imaging drum for wear and toner buildup

2. Verify fuser is operating at the correct temp

What should be checked when you hear grinding in an laser printer

1. Faulty or worn fuser rollers and bearings

2. Worn or damaged gears and bearings

3. Paper path obstructions

4. Improperly aligned, worn, or faulty paper feed rollers

Where do you check paper orientation settings

Printer driver settings

What can cause a failed tray recognition

1. Dirty or malfunctioning sensor

2. Printer settings do not match

3. Unseated or improperly inserted tray

What do you check to troubleshoot network connectivity

1. Verify physical connections

2. Restart devices

3. Check firewall settings

4. Update printer drivers

5. Check printers IP config

6. Uninstall/reinstall printer software on computer

What can solve a frozen print queue

1. Restart print spooler service

2. Manually cancel all pending jobs

3. Power cycle computer and/or printer

4. Update or reinstall driver/software

What is the most common cause when a display shows no signal but the device is powered on

Incorrect input source

What should be done first to fix if a monitor displays a distorted image after connecting with an HDMI cable

Ensure the HDMI cable is not damaged or loose

What troubleshooting steps can help identify physical cabling issues with a display

1. Inspect cable for visible damage

2. Ensure cable is securely connected at both ends

3. Test connection with a known good cable

What is a common symptom of a burnt-out projector bulb

Projector is on but no image is displayed