Shared Flashcard Set

Details

Comptia A+ 220-801
Transcender Questions
89
Computer Networking
Beginner
05/06/2016

Additional Computer Networking Flashcards

 


 

Cards

Term
You are choosing from among several different laptop components. Which of the following operates at the fastest speed?
A. PC card using 16-bit bus
B. ExpressCard using USB 2.0 bus
C. ExpressCard using PCIe bus
D. PCMCIA card using 16-bit bus
Definition
ExpressCard using PCIe bus
Term
Which of the following drives generally provides the largest storage capacity?
A. a 2.5" SATA drive
B. a 3.5" SATA drive
C. a solid-state drive
D. a PCMCIA Type III drive
Definition
a 3.5" SATA drive
Term
When replacing laptop components, which device always involves the detaching and re-attaching of antenna connectors?
A. the screen
B. Mini-PCIe
C. the touchpad
D. the wireless card
Definition
the wireless card
Term
You need to configure a laptop computer so that its power usage is more efficient. Which technology should you use?
A. wake-on-LAN
B. APIPA
C. PCMCIA
D. ACPI
Definition
ACPI
Term
What is the maximum number of PCMCIA Type III cards that can be installed in a single Type III slot without the use of an adapter?
A. a
B. 2
C. 3
D. 4
Definition
1
Term
Which component of an LCD is responsible for converting the DC power back into AC?
A. the inverter
B. the backlight
C. the LCD panel
D. the LCD logic board
Definition
the inverter
Term
A user's laptop computer has an external display port. You want to attach an external projector and allow both the laptop display and the projector to display the laptop's image. Which Function key will allow you to scroll through the display options?
A. the Ctrl key
B. the F2 key
C. the F1 key
D. the Shift key
Definition
the F1 key
Term
Which of the following features is generally NOT included as part of the special Function keys in a laptop computer?
A. Volume controls
B. brightness controls
C. Screen resolution controls
D. Internal/external display controls
Definition
Screen resolution controls
Term
Electro-photographic (ELP) cartridges are found in which type of printers?
A. laser
B. thermal
C. dot-matrix
D. daisy-wheel
Definition
laser
Term
One of your clients needs to print to multi-part forms. Which printer type should you advise your client to consider?
A. laser
B. inkjet
C. thermal
D. dot-matrix
Definition
dot-matrix
Term
What does a dot-matrix printer use to ensure that ink is transferred onto a piece of paper?
A. ink nozzles
B. electrostatic charges
C. print head pins
D. heat fuser
Definition
print head pins
Term
which printer type uses a tractor feed?
A. laser
B. inkjet
C. dot-matrix
D. thermal
Definition
dot-matrix
Term
Which printer upgrade option allows a printer to act as a standalone printer on a network?
A. NIC
B. RAM
C. duplexer
D. finisher
Definition
NIC
Term
What is the purpose of configuring printer availability on the Advanced tab of a printer's Properties dialog box?
A. It configures the orientation that is available.
B. It configure the paper and print quality that is available.
C. It configures the days and times that a printer is available.
D. It configures the users to whom the printer is available.
Definition
It configures the days and times that a printer is available.
Term
You are responsible for performing all routine maintenance on your company's laser printers. Which of the following maintenance tasks would result in the need to reset the page count?
A. replacing the toner
B. installing the maintenance kit
C. calibrating the printer
D. cleaning the printer
Definition
installing the maintenance kit
Term
You are responsible for performing routine maintenance on your company's laser printers. Which of the following routine maintenance does NOT require that you disconnect the laser printer from its power source?
A. replacing the toner
B. installing the maintenance kit
C. calibrating the printer
D. cleaning the printer
Definition
calibrating the printer
Term
You want to prevent your computer from any type of electrostatic discharge (ESD) while servicing the computer.
Which actions should you NOT perform while servicing the computer? (Choose two.)
A. Wear an anti-static wristband.
B. Keep your one hand in contact with bare metal frame of computer at all times.
C. Ensure that the room in which computer is serviced is carpeted.
D. Ensure that the room in which computer is serviced is cool and dry.
E. Wear cotton clothes.
Definition
Ensure that the room in which computer is serviced is cool and dry.
&
Ensure that the room in which computer is serviced is carpeted.
Term
Which procedure should be performed off-site?
A. flashing a BIOS chip
B. disabling bus mastering
C. resolving an IRQ conflict
D. repairing a power supply for a cathode ray tube (CRT)
Definition
repairing a power supply for a cathode ray tube (CRT)
Term
You plan to replace some components within a computer. As a recommended practice, what should be the first step towards disassembling a computer?
A. The processor should be removed from the motherboard.
B. The power supply should be disconnected from the motherboard.
C. The memory modules should be removed from the motherboard.
D. The power cord of the system case should be disconnected.
Definition
The power cord of the system case should be disconnected.
Term
You are an IT technician for a company. You are required to implement CAT-5 cabling for your company's network. The cable will run to each user workstation along the floor. What should you do to secure the cable?
A. Install cables using a protective channel.
B. Install CAT-6 cable instead of CAT-5 cable.
C. Use duct tape to secure the cable.
D. Implement a wireless network.
Definition
Install cables using a protective channel.
Term
What should you do with the empty toner cartridge from a laser printer?
A. Deposit it in a municipal trash bin.
B. Refill it with general-purpose toner.
C. Return it to the manufacturer for recycling.
D. Send it to a standard plastic recycling center.
Definition
Return it to the manufacturer for recycling.
Term
Which detection systems should be installed in the server room to improve the safety of the room and to protect the integrity of the equipment? (Choose all that apply.)
A. temperature detection system
B. water detection system
C. smoke detection system
D. light detection system
Definition
temperature detection system
&
water detection system
&
smoke detection system
Term
Your company has moved to a new facility recently. When you inspect the server room after installation, you find water dripping from the air conditioning unit.
What should you do?
A. Inform building maintenance staff and the system administrator immediately.
B. Move all servers out of the server room and inform building maintenance staff immediately.
C. Move all servers out of the server room and inform senior management via e-mail.
D. Inform security staff immediately.
Definition
Inform building maintenance staff and the system administrator immediately.
Term
You are a desktop administrator for Nutex Corporation. A user in the human resources department is unable to open Internet Explorer on their computer. You go to the customer's desk to troubleshoot the problem. While you are there, you notice confidential documents regarding an employee's recent disciplinary action sitting next to the keyboard.
What should you do?
A. Read the information on the document, and inform your co-workers of its contents.
B. Store the papers in a drawer.
C. Turn the documents over.
D. Read the information on the document, but keep the information confidential.
Definition
Turn the documents over.
Term
You have been assigned a troubleshooting job for a user in the human resources department. When you arrive, you notice that a spreadsheet that contains confidential employee information is open on the user's computer. What should you do?
A. Close the spreadsheet.
B. Ask the user to close the spreadsheet.
C. Minimize the spreadsheet.
D. Leave the spreadsheet alone as long as the user is present.
Definition
Ask the user to close the spreadsheet.
Term
Two months after completing a service call, a customer sends you an e-mail message complaining about the work done. The customer also copies the message to your supervisor and other officers in your company.

You locate the Follow-up Report that was completed by the customer the day after the service was completed. In the report, the customer indicated he was satisfied with the work you completed.
What should you do?
A. Disregard the e-mail.
B. Call the customer and tell him why you think his actions are wrong.
C. Have a meeting with all those who received the e-mail message, explaining to them why you feel the customer is wrong.
D. Send a reply message and include everyone copied on the customer's message thanking the customer for his input and asking why he indicated satisfaction in your work on the Follow-up Report after the work was completed.
Definition
Send a reply message and include everyone copied on the customer's message thanking the customer for his input and asking why he indicated satisfaction in your work on the Follow-up Report after the work was completed.
Term
While servicing a computer at a customer location, you notice a memo regarding an upcoming secret merger that will affect the customer's publicly traded stock. What should you do?
A. Make a copy of the memo, and sell the memo to the press.
B. Contact your stockbroker and purchase the company's stock.
C. Keep the information confidential.
D. Tell your friends about the upcoming merger.
Definition
Keep the information confidential.
Term
While servicing a printer in the human resources department, you overhear a conversation about an increase in the health insurance rates. What should you do?
A. Keep the information confidential.
B. Tell your co-workers about the rate increase.
C. Tell your supervisor about the rate increase.
D. Send an anonymous e-mail to all company employees about the rate increase.
Definition
Keep the information confidential.
Term
You are an IT technician for a computer service company. You are dispatched to a customer location to troubleshoot a printer problem. After resolving the printer problem, the customer asks you to troubleshoot a software issue on one of his computers.

What should you do?
A. Instruct the customer to call the help desk first.
B. Contact your supervisor.
C. Tell the customer you can only work on the original issue.
D. Troubleshoot the software issue.
Definition
Contact your supervisor.
Term
You are at a customer's workplace troubleshooting a computer problem. Your mobile phone rings, and you notice it is a co-worker calling. You ask the customer for permission to take the call and you go into another room.

The co-worker wants to discuss a meeting that is planned for next week.

What should you do?
A. Discuss the meeting, and return to the customer when the call is complete.
B. Discuss the meeting while troubleshooting the computer problem.
C. Tell the co-worker you will return the call when your service call is complete.
D. Call your supervisor to report the co-worker.
Definition
Tell the co-worker you will return the call when your service call is complete.
Term
You are attempting to repair a computer in a customer's home. In the room in which the computer is located, the television is turned on and the volume is turned up. You keep losing your train of thought during the troubleshooting process.

What should you do?
A. Turn down the volume on the television.
B. Ask the customer to turn down the volume on the television.
C. Move the computer into another room to complete the repair.
D. Take the computer back to your office to complete the repair.
Definition
Ask the customer to turn down the volume on the television.
Term
What should you do if you discover inappropriate material on a company-owned computer but no specific company computer-use policy exists?
A. Inform your supervisor of the inappropriate material.
B. Inform the user's supervisor of the inappropriate material.
C. Ask the user to remove the inappropriate material.
D. Inform the company president of the inappropriate material.
Definition
Inform your supervisor of the inappropriate material
Term
While performing preventative maintenance on a user's computer, you notice several files that violate the Acceptable Usage Agreement the user signed when initially employed by the company. The IT department has specific policies for dealing with any violations. What should you do?
A. Contact your supervisor.
B. Contact the user's supervisor.
C. Inform the user that the files must be removed.
D. Follow the procedures for dealing with this violation.
Definition
Follow the procedures for dealing with this violation.
Term
Which cable connector is used in a 1000BaseT network?
A. SC
B. ST
C. MTRJ
D. RJ-45
Definition
MTRJ
Term
Which connector would you use to connect an S-video cable to a portable computer? there was 4 pictures to choose from on this practice test
Definition
it would be the black circular one with 2 holes towards top 2 holes in middle and vertical square shape hole at bottom of circle
Term
Why would you implement a KVM switch?
A. to segment a network
B. to protect an internal network
C. to cache Web data and images
D. to reduce device needs in a data center
Definition
to reduce device needs in a data center
Term
You need to connect two computers for a customer. The customer does not have a network and does not wish to purchase a concentrator, but both computers include functional Ethernet network interface cards with RJ-45 connectors.

Which component will allow you to meet your customer's needs?
A. an Accelerated Graphics Port (AGP) card
B. a passive hub
C. a crossover cable
D. a protocol analyzer
Definition
a crossover cable
Term
Which network topology supports the longest maximum cable length?
A. 10Base2
B. 10Base5
C. 10BaseF
D. 100BaseT
Definition
10BaseF
Term
You are installing the network cabling for your company. A diagram of the cabling is shown in the following image:
[image]
Which type of cable are you installing?
A. shielded twisted pair (STP) cable
B. unshielded twisted pair (UTP) cable
C. coaxial cable
D. fiber optic cable
Definition
fiber optic cable
Term
Which statement characterizes a Universal Serial Bus (USB) mouse?
A. You can plug a USB mouse into a computer while the computer is on.
B. You must connect a USB mouse to the computer through a parallel port.
C. You must restart the computer immediately after connecting the USB mouse.
D. You cannot connect a USB mouse if another USB device is already connected to the computer.
Definition
You can plug a USB mouse into a computer while the computer is on.
Term
For what purpose have IP addresses in the 192.168.0.0 through 192.168.255.255 range been reserved?
A. multicasting
B. private networks
C. military installations only
D. government organizations other than the military
Definition
private networks
Term
Which properties are true regarding IPv6? (Choose two.)
A. It has 4 billion available addresses
B. It has 340 undecillion available addresses
C. It uses 32-bit addresses
D. It uses 128-bit addresses
Definition
It has 340 undecillion available addresses
&
It uses 128-bit addresses
Term
You administer your company's 100BaseTX Ethernet network. TCP/IP is the networking protocol used on the network. You want the routers on the network to send you notices when they have exceeded specified performance thresholds.

Which protocol should you use to enable the routers to send the notices?
A. ARP
B. SMTP
C. SNMP
D. Telnet
Definition
SNMP
Term
You administer computers on a Microsoft Windows 2003 TCP/IP network. On the network, you want to use a domain name-to-Internet Protocol (IP) address name resolution system that provides a central database on a server to resolve domain names to IP addresses.

Which options should you implement on your network?
A. the Domain Name System (DNS)
B. the HOSTS file
C. the LMHOSTS file
D. the Windows Internet Name Service (WINS)
Definition
the Domain Name System (DNS)
Term
Match protocols to default ports
protocols: DEFAULT PORTS:
HTTPS PORT 21
POP3 PORT 110
FTP PORT 143
IMAP PORT 443
RDP PORT 3389
Definition
FTP = PORT 21
HTTPS = PORT 110
RDP = PORT 143
POP3 = PORT 443
IMAP = PORT 3389
Term
Which technology has the SHORTEST maximum range?
A. Bluetooth 1.0
B. Bluetooth 2.0
C. 802.11a
D. 802.11b
Definition
Bluetooth 2.0
Term
Which transmission mode is used in 802.11 WLANs?
A. mixed mode
B. simplex mode
C. full-duplex mode
D. half-duplex mode
Definition
half-duplex mode
Term
You are an IT technician at your company. The company has two small offices in different cities. The company's head office contains a DNS server and a DHCP server. The branch office does not contain a DHCP server.

A user travels frequently between the head office and the branch office. You are configuring the IP address on this user's laptop. You are required to ensure that the user is able to connect to the Internet from both offices.

How should you configure the Internet Protocol (TCP/IP) Properties dialog box on the user's laptop while expending the least administrative effort?
A. Configure the General tab to use the DHCP server at the head office. Configure a static IP address from the branch office network range on the Alternate Configuration tab.
B. Configure the General tab and the Alternate Configuration tab to use the DHCP server.
C. Configure a static IP address from the head office network range on the General tab. Configure a static IP address from the branch office network range on the Alternate Configuration tab.
D. Configure the General tab and the Alternate Configuration tab to use a static IP address from the branch office network range.
Definition
Configure the General tab to use the DHCP server at the head office. Configure a static IP address from the branch office network range on the Alternate Configuration tab.
Term
Which components are displayed in the Wireless Network Connection Status dialog box on a Windows XP-based client computer that is connected to a wireless network? (Choose all that apply.)
A. speed
B. EAP type
C. signal strength
D. enable or disable IEEE 802.1x authentication
Definition
SPEED
&
SIGNAL STRENGTH
Term
A salesman for your company travels primarily in Europe and Asia. You need to provide him with a wireless Internet technology that will work internationally on his laptop and that can be installed easily when he arrives at a new location. Which technology should you install?
A. CDMA cellular
B. GSM cellular
C. satellite
D. Bluetooth
Definition
GSM cellular
Term
You configure a Bluetooth network that connects a user's laptop computer with his cell phone. Which type of network have you created?
A. LAN
B. WAN
C. PAN
D. VPN
Definition
PAN
Term
You need to allow users to connect to your network remotely from the Internet. The connection must be secure. What should you configure?
A. firewall
B. screened subnet
C. demilitarized zone (DMZ)
D. virtual private network (VPN)
Definition
virtual private network (VPN)
Term
What is the purpose of PoE?
A. It allows a network of computers to appear to the Internet as a single entity.
B. It provides a file storage solution that is attached to the network.
C. It allows an Ethernet connection to be used as both a network and power connection.
D. It provides a cryptographic hardware platform for securely storing data.
Definition
It allows an Ethernet connection to be used as both a network and power connection.
Term
Which hardware device operates at the data-link layer of the Open Systems Interconnection (OSI) model and ensures that data is delivered only to the destination port?
A. switch
B. hub
C. bridge
D. router
Definition
switch
Term
Which tool would be used to measure the voltage supplied by a disk drive power connector?
A. ohmmeter
B. multimeter
C. SCSI terminator
D. Windows Resource Meter
Definition
multimeter
Term
After which procedure are you most likely to flash a computer's BIOS?
A. adding memory
B. upgrading CPU
C. replacing the system board
D. changing the boot sequence
Definition
upgrading CPU
Term
What is the purpose of scalable link interface (SLI) technology?
A. It groups two or more network links together to increase performance.
B. It groups two video cards together to increase video performance.
C. It utilizes multiple serial connections to increase performance.
D. It provides scalability for motherboard serial connections.
Definition
It groups two video cards together to increase video performance.
Term
You are scheduled to receive a new computer with an AGP slot. Which device is supported by this type of slot?
A. video cards
B. external hard disks
C. network interface cards
D. random access memory (RAM)
Definition
video cards
Term
You need to install several USB devices on a server. You have been asked to attach USB hubs to the computer. Only one USB port is available. How many hubs can you daisy chain using the single port?
A. 2
B. 3
C. 4
D. 5
Definition
5
Term
What is the maximum cable length supported for an RS-232C serial cable?
A. 12 feet
B. 15 feet
C. 30 feet
D. 50 feet
Definition
50 feet
Term
You have two RAM modules. One has a label that says PC4200, and the other has a label that says PC2-4200. Which statement is true about these two RAM modules?
A. Both RAM modules operate at a clock speed of 266 MHz.
B. Both RAM modules operate at a clock speed of 533 MHz.
C. Both RAM modules are DDR RAM.
D. Both RAM modules are DDR2 RAM.
Definition
Both RAM modules operate at a clock speed of 533 MHz.
Term
Which component detects both single-bit and multi-bit errors?
A. parity bit
B. ECC
C. L1 cache
D. L2 cache
Definition
ECC
Term
Which type of computer memory module has 168 pins?
SIPP
A. SIMM
B. DIMM
C. DIPP
D. RDRAM
Definition
DIMM
Term
THIS ? WAS MATCH ALL MOTHERBOARD COMPONENTS. IT WAS A DRAG AND DROP OF:
pci slots
pcie 16x slots
pcie 1x slots
northbridge
cpu socket
atx 4-pin power connector
cpu fan connector
memory slots
fdd connection
atx 12-pin power connector
ide hdd connection
sata connections
front panel connectors
southbridge
cmos battery
external usb connections
Definition
Term
You are a desktop engineer for Verigon Corporation. Gloria Taylor requires a PCI network interface card and a PCI sound card installed in her computer. Her computer has three PCI slots, two of which contain the video card and the modem, respectively.

Which card should you use to attach both the PCI network interface card and sound card to the computer?
A. riser card
B. PCMCIA card
C. USB PCI card
D. flash memory card
Definition
RISER CARD
Term
What is the name of the media of a hard drive where data is stored?
A. head actuator
B. disk platter
C. read/write heads
D. firmware
Definition
DISK PLATTER
Term
For which type of device should you use the Safely Remove Hardware icon to stop the device's operation before removing it from the computer?
A. CD-ROM drive
B. hard drive
C. DVD drive
D. USB flash drive
Definition
USB FLASH DRIVE
Term
Which statements about IDE drives are true? (Choose two.)
A. You must use a 40-pin connector with IDE drives.
B. You must terminate both ends of the IDE bus.
C. You can use either a 25-pin or a 50-pin data cable with IDE drives.
D. You can attach up to seven IDE drives together using the same controller card.
E. You can attach two IDE drives on the same controller as long as the drives are configured as master and slave.
Definition
You must use a 40-pin connector with IDE drives.
&
You can attach two IDE drives on the same controller as long as the drives are configured as master and slave.
Term
How many pins are in an IDE ribbon cable connector?
A. 34
B. 40
C. 50
D. 68
Definition
40
Term
Steven's computer includes a hard drive that connects to the computer's motherboard by means of a 7-wire cable with a single interface.

Which hard drive interface is used by Steven's disk drive?
A. IDE
B. EIDE
C. SCSI
D. Serial ATA
Definition
Serial ATA
Term
How many hard drives can be connected to a single IDE cable?
A. 1
B. 2
C. 4
D. 8
Definition
2
Term
You have a motherboard that includes an LGA 1155 CPU socket. Which CPU would NOT be supported with this motherboard?
A. Core 2 Duo
B. Core i7
C. Celeron
D. Xeon
Definition
Core 2 Duo
Term
Which of the following CPU sockets will NOT support an AMD Opteron CPU?
A. F
B. FM1
C. 940
D. AM2
Definition
FM1
Term
What is the primary purpose of a GPU?
A. processing gaming applications
B. processing video and graphics
C. providing additional memory
D. providing video capture capability
Definition
processing video and graphics
Term
If two SCSI devices on an 8-bit bus want to use the SCSI bus at the same time during normal operation, which device has priority?
A. The device with the lower ID number
B. The device with the higher ID number
C. The device closest to the Host Bus Adapter
D. The device farthest away from the Host Bus Adapter
Definition
The device with the higher ID number
Term
On which architecture are central processing unit (CPU) sockets built?
A. CHS
B. PGA
C. ATA
D. EIDE
Definition
PGA
Term
Which operating frequency band is used by Bluetooth technology?
A. 2.4 GHz to 2.485 GHz
B. 125 KHz to 134 KHz
C. 13.56 MHz
D. 860 MHz to 930 MHz
Definition
2.4 GHz to 2.485 GHz
Term
What is the operating range for Class 2 Bluetooth devices?
A. 10 meters or 33 feet
B. 1 meter or 3 feet
C. 100 meters or 300 feet
D. 200 meters or 600 feet
Definition
10 meters or 33 feet
Term
You have decided to enable overclocking to increase the performance of a computer. On which computer components can you specifically enable overclocking? (Choose all that apply.)
A. motherboard
B. processor
C. system bus
D. RAM
E. hard drive
Definition
PROCESSOR
&
SYSTEM BUS
&
RAM
Term
You have purchased a new 20-pin power supply to replace one that failed. However, the motherboard only has a 24-pin connector. What should you do?
A. Purchase a 24-pin power supply.
B. Plug the 20-pin power supply into the motherboard, leaving pins 1, 2, 13, and 14 on the motherboard unconnected.
C. Plug the 20-pin power supply into the motherboard, leaving pins 11, 12, 23, and 24 on the motherboard unconnected.
D. Purchase a motherboard with a 20-pin power connector.
E. Change the setting on the voltage selector switch.
Definition
Plug the 20-pin power supply into the motherboard, leaving pins 11, 12, 23, and 24 on the motherboard unconnected
Term
Which device provides a physical connection between a computer and a computer network using an Ethernet cable?
A. a modem
B. a firewall
C. a NIC
D. a riser board
E. a capture card
Definition
a NIC
Term
Which computer component uses passive and active matrix technologies?
A. cathode ray tube (CRT) monitor
B. liquid-crystal display (LCD) monitor
C. memory
D. hard drive
Definition
liquid-crystal display (LCD) monitor
Term
Which port is displayed in the exhibit? (Click the Exhibit(s) button.)
A. video graphics array (VGA) port
B. serial port
C. parallel port
D. S-video port
Definition
parallel port
Term
Which type of connector is shown in the exhibit? (Click the Exhibit(s) button.)
A. video graphics array (VGA)
Connector
B. serial connector
C. parallel connector
D. S-video connector
Definition
serial connector
Term
Which cable connector is used in a 1000BaseT network?
A. SC
B. ST
C. MTRJ
D. RJ-45
Definition
MTRJ
Term
Why would you implement a KVM switch?
A. to segment a network
B. to protect an internal network
C. to cache Web data and images
D. to reduce device needs in a data center
Definition
to reduce device needs in a data center
Term
You need to connect two computers for a customer. The customer does not have a network and does not wish to purchase a concentrator, but both computers include functional Ethernet network interface cards with RJ-45 connectors.

Which component will allow you to meet your customer's needs?
A. an Accelerated Graphics Port (AGP) card
B. a passive hub
C. a crossover cable
D. a protocol analyzer
Definition
a crossover cable
Term
Which network topology supports the longest maximum cable length?
A. 10Base2
B. 10Base5
C. 10BaseF
D. 100BaseT
Definition
10BaseF
Term
Which statement characterizes a Universal Serial Bus (USB) mouse?
A. You can plug a USB mouse into a computer while the computer is on.
B. You must connect a USB mouse to the computer through a parallel port.
C. You must restart the computer immediately after connecting the USB mouse.
D. You cannot connect a USB mouse if another USB device is already connected to the computer.
Definition
You can plug a USB mouse into a computer while the computer is on.
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