CompTIA A+ again
Which ports are used by the IMAP protocol? A. 53 and 68 B. 80 and 443 C. 110 and 995 D. 143 and 993
143 and 993
Which are the most common laptop hard drive form factors? (select two) A. 5.1 B. 2.5 C. 7.1 D. 1.8
2.5" and 1.8"
What is the module format for a stick of SODIMM DDR4 RAM? A. 200-pin B. 204-pin C. 260-pin D. 1.8 inch
260-pin
Which standard can attain a data transfer rate of 1 Gbps over a wireless connection? A. 802.11a B. 802.11b C. 802.11g D. 802.11ac E. 802.3ab
802.11ac can attain speeds in excess of 1 Gbps over wireless.
What are bridges?
A bridge is a device that can either connect two LANs together, or separate them into two sections. Bridges can be wired and wireless. They are used for increasing the size of networks.
What is a managed switch?
A managed switch can be configured when accessed from a browser, SSH, or similar configuration tool. You can change the device's IP, turn on STP (Spanning Tree Protocol to avoid network looping), enable system logging (syslog), and monitor the switch and other devices with SNMP.
Which of the following devices can be configured when accessed from a browser or SSH or similar configuration tool? A. Managed switch B. Unmanaged switch C. Patch panel D. Network interface card (NIC)
A managed switch.
What are network controllers and cloud-based network controllers?
A network controller is software (or a device and software) that provides for centralized management, configuration, and monitoring of a computer network, physical or virtual. Network controllers are often programmable, and can automate the tasks of managing network infrastructure. A cloud-based network controller can be accessed over the internet at your cloud provider.
What are patch panels?
A patch panel is a physical hardware device that acts as a termination point for all of the network cables in a building. It can be located in a wiring closet, server room, or data center. A patch panel consists of multiple RJ45 ports on the front that connect to switches via twisted-pair patch cables, and 110 IDC termination points on the back for connecting all of the individual wires in twisted-pair cables. Those cables lead out to the various computer ports in the building.
Which type of server acts as a go-between for clients and websites? A. Proxy server B. Print server C. Syslog server D. DHCP server
A proxy server is a caching server used to store commonly accessed websites by clients. It can be incorporated into a web server but often it runs as a standalone server.
How does a router work?
A router examines a data packet header's destination IP address and compares it against a routing table to determine the packet's next best hop. A typical home office router directs all outbound traffic to its ISP. Many routers also perform NAT (Network address translation), shielding the private IP addresses of a LAN by readdressing all outgoing traffic with a single shared public IP address.
What is a switch?
A switch is a central connecting device that all computers connect to in a wired fashion (star topology). A switch sends the signal (frames of data) to the correct computer instead of broadcasting it to every port. It does that start by identifying the MAC address of each computer (mapping).
Which of the following network devices moves frames of data between the source and destination based on their Mac addresses? A. Hub B. Switch C. Router D. Modem
A switch. It sends frames of data between computers by identifying the systems by their MAC addresses.
A user doesn't see anything on his laptop's screen. He tries to use AC power and thinks that the laptop is not receiving any. Which of the following are two possible reasons for this? (Select the two best answers.) A. He is using an incorrect AC adapter. B. The AC adapter is not connected to the laptop. C. Windows won't boot. D. The battery is dead.
A. He is using an incorrect AC adapter. B. The AC adapter is not connected to the laptop.
What kinds of hard drives are used by laptops? Select all that apply. A. SSD B. M.2 C. Magnetic disk D. DVD-ROM
A. SSD B. M.2 C. Magnetic disk
What is an unmanaged switch?
An unmanaged switch doesn't have the capabilities of a managed switch. They simply connect devices and computers together for transmission of data over the Ethernet network. they are a less expensive way of adding computers to your network.
While looking at the details of a server in your provider's control panel, you notice that it says "Apache" in the HTTP summary. What kind of server is this? A. File server B. Web server C. E-mail server D. Authentication server
Apache is a type of web server that runs on Linux. It is also known as Apache HTTP Server.
Which of the following are possible reasons that a laptop's keyboard might fail completely? (Select the two best answers.) A. A key is stuck. B. A ribbon cable is disconnected. C. The user spilled coffee on the laptop. D. The keyboard was disabled in the Device Manager.
B. A ribbon cable is disconnected. C. The user spilled coffee on the laptop. * Keyboard cannot be disabled in Device Manager, only uninstalled.
You have been tasked with connecting a wireless earpiece to a smartphone. which technology would you most likely use? A. Wi-fi B. NFC C. 3.5 mm D. Bluetooth
Bluetooth
Which of the following are ways that a laptop can communicate with other computers? Select all that apply. A. Bluetooth B. WLAN C. DC jack D. Cellular WAN
Bluetooth, WLAN, Cellular WAN
You are helping a project manager with a presentation using a laptop which feeds video to a projector. During your tests, the projector's image begins to flicker. The laptop's display does not have any problems. You attempt to change the resolution on the laptop, but the issue continues. Which of the following should you do next? A. Change the projector settings. B. Check the connectivity of the video cable. C. Change the aspect ratio of the laptop. D. Check the connectivity of the power cable.
Check the connectivity of the video cable. If it is flickering, chances are that the cable is loose, or the cable's quality is lacking. Screen flicker is more common with VGA cables, but it can happen with just about any connection.
One of your customers reports said she walked away from her laptop for 30 minutes. When she returned, the display was very dim. She increased the brightness setting and moved the mouse but to no effect. What should you do first? A. replace the LCD screen B. check the operating system for corruption C. connect an external monitor to verify that the video card works D. Check whether the laptop is now on battery power
Check whether the laptop is now on battery power
Which of the following are two possible reasons why a laptop's LCD suddenly went blank with no user intervention? (select the two best answers) A. Damaged inverter B. damaged LCD C. burned out backlight D. incorrect resolution setting
Damaged inverter or burned out backlight
Which of the following is not a mobile device? A. Tablet B. Smartphone C. Desktop PC D. E-reader
Desktop PC
When manually configuring a Wi-Fi connection, which step occurs after successfully entering the SSID? A. Select POP3. B. Check whether the device is within range of the WAP. C. Enter a passcode for the network. D. Scan for networks.
Enter a passcode for the network.
Which of the following keys should you press to enable a secondary display on a laptop? (select the two best answers) A. FN key B. Caps Lock key C. Num Lock key D. Special function key E. Insert key
FN key or Special function key
A router makes a connection between two networks, and a bridge is used to connect two LANs or separate a single LAN into two sections. What device protects a network from unwanted intrusion? A. Switch B. Router C. Access point D. Firewall
Firewall
Which of the following is described as the simultaneous sending and receiving of network data? A. Half-duplex B. Latency C. PoE D. Full-duplex
Full-duplex is when a network adapter (or other device) can send and receive information at the same time.
You have been tasked with setting up a device for a salesperson's vehicle. It should be able to display maps and give directions to the person while driving. Which of the following devices would perform these tasks? (select the two best answers) A. GPS B. Smart camera C. smartphone D. e-reader E. VR headset
GPS or smartphone
A user doesn't see anything on his laptop's screen. He tries to use AC power and thinks that the laptop is not receiving any. Which of the following are two possible reasons for this? (select the two best answers) A. He is using an incorrect AC adapter B. The AC adapter is not connected to the laptop C. Windows won't boot D. The battery is dead
He is using an incorrect AC adapter, or the AC adapter is not connected to the laptop.
What are hubs?
Hubs work kind of like switches. They have multiple ports and only one main circuit that all ports connect to. Hubs broadcast data to all computers, the one it's meant for accepts it, and the rest drop the information. Because of this, hubs allows only two computers to communicate with each other at any given time.
Which of the following identifies the user of the device? A. IMSI ID B. IMEI ID C. S/MIME D. VPN
IMSI ID - International Mobile Subscriber Identity.
What is APIPA and link-local addresses?
IP addresses can also be self-assigned by the computer. In Windows, this is known as Automatic Private IP Addressing (APIPA), and it occurs when a computer cannot contact a DHCP server to obtain an IP address. When APIPA self-assigns an address, it will be on the 169.254.0.0 network. Addresses on this network are also known as link-local addresses.
Which of the following is often broken down into groups of channels including 1-5, 6-10, and 11? A. 802.11ac B. 2.4 GHz C. 5 GHz D. 802.11a
In the United States, the 2.4-GHz frequency range is broken down into three categories: Channel 1-5, 6-10, and 11.
What is a PoE injector?
It is a cheaper PSE solution when one needs to connect just 1-2 devices. The injector is installed into the main network switch, into one of its ports, and powered with an AC outlet. The injector also has a second RJ45 port used to connect out to the remote device.
What is a network interface card (NIC)?
It is a physical device that can be added to a computer or networking device that has an open compatible slot (like a PCI Express slot X1 or X4.) This allows for connectivity to a computer network. Most PCs and laptops have an NIC integrated into the motherboard. But sometimes workstations and servers require a more powerful separate NIC, or even several, which have multiple RJ45 ports for increased data throughput and higher availability.
What type of cabling should be used with PoE technology?
It is important to use the correct type of cabling so that it can handle the amperage required -- typically, a Category 5 twisted-pair cabling (and higher).
What is ethernet over power?
It's a similar idea to PoE, only in this case data can be sent over electrical lines (PLC - power line communication).
Which type of charging connector would you find on an iPad? A. Micro USB B. Lightning C. Thunderbolt D. IP68
Lightning
Which of the following allows other mobile devices to wirelessly share your mobile device's Internet connection? A. NFC B. Airplane mode C. IMAP D. Mobile hotspot
Mobile hotspot.
The organization you work for allows employees to work from their own mobile devices in a BYOD manner. You have been tasked with setting up the devices so that they can "beam" information back and forth between each other. What is this known as? A. Mobile hotspot B. IoT C. CYOD D. IR E. NFC
NFC. "Beaming" the information back and forth can be accomplished in a couple of ways, primarily by using near field communication (NFC). This can only be done if the devices are in close proximity to each other.
What is NFC?
Near Field Communication. You can send small amounts of data wirelessly over a limited area. it's built into your phone, and it can be used for payment systems, transportation, in-person information exchange.
Which of the following uses an organic compound that emits light? A. TFT active matrix B. IPS C. OLED D. LCD E. LED
OLED
Which of the following connections require a username, password, and SMTP server? (select the two best answers) A. Bluetooth connection B. Wi-fi connection C. POP3 connection D. Exchange connection E. IMAP connection
POP3 connection and IMAP connection
What is power over Ethernet (PoE)?
PoE is an Ethernet standard that allows for passing of electrical power in addition to data over Ethernet cabling. PoE is described in IEEE 802.3af-2003, 802.3at-2009, and 802.3bt standards. PoE can deliver between 15.4W and 100W maximum to a variety of devices, as long as they are PoE compliant. The exact amount of wattage will depend on the standard, but 15 to 30 watts is common.
Which of the following forwards an external network port to an internal IP address/port on a computer on the LAN? A. NAT B. Port forwarding C. DMZ D. DHCP
Port forwarding is used to forward external network ports to an internal IP and port. This is done so a person can host services such as FTP internally.
Which of the following network devices allows a remote device to obtain ethernet data as well as electrical power? A. PD B. PoE injector C. Repeater D. Router
Power over Ethernet (PoE) injector sends Ethernet data and power over a single twisted-pair cable to a remote device.
Which of the following allows for network throttling of individual computers or applications? A. QoS B. Port forwarding C. DMZ D. DHCP
QoS -- Quality of service is a technology used in SOHO routers that can throttle bandwidth and give higher priority to individual computers or applications.
Which of the following would a company most likely use for authentication to a server room? A. 802.11ac B. 802.15-4 C. RFID D. Z-Wave E. MIMO
RFID -- radio-frequency identification -- is commonly used for access to areas of a building such as a server room. It is often implemented as a proximity-based ID card or badge.
You just added a second memory module to a laptop. However, after rebooting the system, the OS reports the same amount of memory as above. What should you do next? A. Replace both memory modules B. Run Windows update C. Replace the motherboard D. Reseat the laptop memory
Reseat the laptop memory.
A user can receive email but cannot send any. Which protocol is not configured properly? A. POP3 B. FTP C. SMTP D. SNMP
SMTP -- simple mail transfer protocol
Which protocol uses port 22? A. FTP B. Telnet C. SSH D. HTTPS
SSH -- Secure Shell
What is it known as when a user connects to several services using several apps but with only one username and password? A. Android Auto B. SSO C. iTunes D. BT E. Exchange ActiveSync
SSO - single sign-on.
Which type of memory do most mobile devices store long-term data to ? A. LPDDR4 B. SATA magnetic disk C. SATA SSD D. Solid-state flash memory
Solid-state flash memory
Which of the following is most often used to connect a group of computers in a LAN? (select all that apply): A. Router B. Switch C. Bridge D. WAP
Switch and WAP (wireless access point).
Which standards define switches?
Switches work within the Ethernet standard, specifically 802.3 set of standards. For instance 802.3ab is 1000 Mbps, and 802.3an is 10 Gbps.
Which kind of video technology do most laptop LCDs use? A. TFT active matrix B. Passive matrix C. OLED D. MAC ID
TFT active matrix
Which of the following can be useful in areas where a smartphone has cellular access but the PC (or laptop) cannot connect to the Internet? A. Proprietary vendor-specific connector B. Accessories C. IP codes D. Tethering
Tethering.
You are helping a customer with a laptop issue. The customer said that two days ago the laptop was accidentally dropped while it was charging. You observe that the laptop will not turn on and that it is connected to the correct power adapter. Which of the following is the most likely cause? A. The battery B. The power adapter C. The hard drive D. The DC jack E. The BIOS/UEFI
The DC jack was probably damaged from the fall.
What are repeaters?
The repeater or extender is a device used to lengthen the signal farther than it was designed to do. For example, standard wired LAN from a switch can transmit data 328ft (or 100m), but a repeater could increase the distance by as much as two times. There are repeaters for WAPs, as well, that can increase the range of wireless network.
What are cable and DSL modems?
These are devices that allow a computer (or SOHO network) to access the internet. Cable internet: a client will use a device with an RG-6 port for the provider's coaxial cable. DSL internet: a client will use a device with an RJ11 port that makes use of a client's telephone line. Both devices use an RJ45 port that connects to the consumer's computer or SOHO router via twisted-pair patch cable.
How does PoE work?
This technology consists of two devices: 1) the power sourcing equipment (PSE), which could be a switch or other similar device; 2) the power device (PD), which can be an IP camera, a WAP, IP phone, mini networks switch, lightning controller, and so on.
Which of these would be used for streaming media? A. TCP B. UDP C. RDP D. DHCP
UDP -- User Datagram Protocol
Which of the following is the most common connection method when synchronizing data from a mobile device to a PC? A. Wi-Fi B. Bluetooth C. USB D. Lightning
USB
What is a wireless access point (WAP)?
WAP enables data communications over the air when your computer is equipped with a wireless networking adapter. The WAP and the adapter transmit data over radio waves on either 2.4 GHz or 5 GHz frequencies.
Which of the following allows us to access WLAN? A. LED B. webcam C. Digitizer D. Stylus E. Wi-fi card
Wi-fi card
Which of the following is used to synchronize contacts from an iPad to a PC? (select the best answer) A. Gmail B. Google Play C. iTunes D. Sync Center
iTunes
You are required to add long-term storage to a smartphone. Which type would you most likely add? A. DDR4 B. microSD C. LPDDR4 D. SSD E. SIM
microSD