Practice exam (3) Flashcards
In a laptop computer, which component is responsible for providing the right kind of energy to light the display?
Inverter
Backlight
Screen
Inverter
Fluorescent lighting, and LCD backlights in particular, require fairly high-voltage, high-frequency energy. The component that provides the right kind of energy is the inverter. The inverter is a small circuit board installed behind the LCD panel that takes DC current and inverts it to AC for the backlight
A user complains of a burning smell and smoke coming from his computer. After shutting it down, you notice that the motherboard has burn marks on it. You replace the motherboard. The next day, the user complains of more smoke, and you see this motherboard is burnt as well. What should you do next?
Replace the motherboard
Replace the motherboard and power supply
Replace the computer into a different wall outlet
Replace the motherboard and power supply
If you have scorch marks on a component, say a video card or a motherboard, it could be that the specific component went bad. It could also be a sign of a problem with the power supply. If you replace the component and a similar problem occurs, definitely replace the power supply as well as the damaged component
You have a network installation that requires transmission speeds of 10 Gbps at a distance of 85 meters. Among the UTP standards listed, which one is the oldest one that meets the requirements for this network?
CAT5
CAT6
CAT7
CAT7
CAT7 UTP can handle 10 Gbps transmissions over 100 meters. CAT6 will transmit at 10 Gbps, but only for 55 meters, while CAT6A can handle the same transmission speed up to 100 meters. CAT5 has a maximum speed of 100 Mbps, and CAT5e has a maximum of 1 Gbps
You are troubleshooting a Windows 10 computer and suspect the hard drive has some bad sectors. Which utility should you use to scan the hard drive and attempt to fix the bad sectors?
format
bootrec
chkdsk
chkdsk
You can use the Windows chkdsk utility to create and display status reports for the hard disk. chkdsk can also correct file system problems (such as cross-linked files) and scan for and attempt to repair disk errors
Which of the following is not verified as part of the POST routine?
BIOS integrity
Hard drive integrity
System buses
Hard drive integrity
The POST routine verifies the BIOS integrity as well as the presence of multiple hardware devices, including RAM, boot devices, and system buses. It does not verify the integrity of the hard drive (such as looking for bad sectors)
You are installing and configuring DHCP on one of your severs. What port numbers are used by DHCP? (Choose two)
TCP 67
TCP 68
UDP 67
UDP 68
UDP 67
UDP 68
Dynamic Host Configuration Protocol (DHCP) dynamically assigns IP addresses and other IP configuration information to network clients. It’s not considered a critical service requiring guaranteed data delivery, so it uses the connectionless UDP as its host-to-host layer protocol. It uses UDP 67 and UDP 68
A user reports having error message pop up saying that Windows has detected an IP address conflict. Your network uses a DHCP server. What should you do to resolve the problem?
On the user’s computer, run ipconfig /release and ipconfig /renew
On the user’s computer, ensure that it’s set to Obtain An IP Address Automatically
On the user’s computer, ensure that it’s set to Use The Following IP Address
On the user’s computer, ensure that it’s set to Obtain An IP Address Automatically
The most common cause of an IP address conflict is if someone configures a computer with a static IP address that’s part of the DHCP server’s range. The DHCP server, not knowing that the address has been statically assigned somewhere, doles out the address and now there’s a conflict. Rebooting the computer won’t help, and neither will be releasing the address and getting a new lease from the DHCP server—it’s just going to hand out the same address again because it doesn’t know that there’s a problem
A technician is troubleshooting a RAID-5 array with four hard disks. Two of the disks have failed. What can he do to recover the array?
Rebuild the failed disks and restore from backup
Replace the failed disks and rebuild the array
Replace the failed disks and restore from backup
Replace the failed disks and restore from backup
If you’re using RAID-5 (disk striping with parity), a single drive failure usually means that your data will be fine, provided you replace the failed drive. If you lose multiple drives at the same time, you will need to restore from backup
You are at a Windows sever with a command prompt open. You want to share the D:\corp\acctrec directory and have users connect to it with the name receipts. Which command is correct to do this?
net share receipts=D:\corp\acctrec
net share D:\corp\acctrec=receipts
netdom share receipts=D:\corp\acctrec
net share receipts=D:\corp\acctrec
The net share command is used to share folders on a network. (And net use will allow users to connect to them.) The proper syntax is net share = :
MicroSD cards, often used in mobile phones, are the smallest memory cards commonly used. What is the size of a MicroSD card?
21.5 x 20 mm
15 x 11 mm
11 x 8 mm
15 x 11 mm
MicroSD cards are 15mm × 11mm. xD Picture Cards are 25mm × 20mm, and miniSD cards are 21.5mm × 20mm. There is no current standard for an 11mm × 8mm memory card. For comparison, standard SD cards measure 32mm × 24mm
You are troubleshooting a laptop that will not power up while plugged into a wall outlet. You verified that the outlet works and have tried a second AC adapter, but it still won’t power up when plugged in. If you unplug it from the wall, it will power up from the battery. What should you do to get it to power up while plugged into the wall outlet?
Remove the battery, power it up, and reinsert the battery
Drain the battery completely and then power it up
Replace the battery
Remove the battery, power it up, and reinsert the battery
The first thing to try is to remove the battery and then see whether it will power up using AC power. This usually works. Longer term, you may want to replace the battery
When setting up your network, you configured your clients to obtain IP addressing information automatically from a DHCP server. Which of the following configuration items can the DHCP server provide?
IP address and subnet mask
IP address and subnet mask, and default gateway
IP address and subnet mask, and default gateway, and DNS server address
IP address and subnet mask, and default gateway, and DNS server address
The DHCP server can provide all required and optional TCP/IP configuration information to clients. This includes an IP address, subnet mask, default gateway, and DNS server address
Your office just increased from 20 to about 40 people. Everyone uses the same laser printer. When you print, jobs are often processed very slowly. Other than get a new printer, what can you do to help eliminate the problem?
Upgrade the printer’s memory
Upgrade the printer’s processor
Stop and restart the print spooler
Upgrade the printer’s memory
If print jobs are processed very slowly or if you are continually seeing “low memory” error messages, it might be a good time to upgrade the memory in the printer
A user with a 802.11g network adapter is trying to join your new 802.11ac network. Her laptop is next to yours, which is connected to the network. However, she is unable to locate the SSID. What is most likely the cause of the problem?
The user is out of range of the wireless access point
The SSID has been changed
802.11g is not compatible with 802.11ac
- 11g is not compatible with 802.11ac
- 11g operates at 2.4 GHz, whereas 802.11ac operates at 5 GHz. Therefore, her network adapter may not see the 802.11ac network. Many 802.11ac routers are dual-band, which means they do support 2.4 GHz devices for backward compatibility. But the standards themselves operate on different frequencies
During the transferring step of the laser printing imaging process, what charge is applied to the paper?
-100 VDC
+600 VDC
+100 VDC
+600 VDC
The charging corona or wire applies a strong positive charge (+600 VDC) to the paper. This allows the paper to attract the negatively charged toner from the imaging drum
