Comptia A+
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1
What does an inverter do?
Converts DC power to AC power; powers a screen's backlight.
2
What is a port replicator?
A simple, small docking station using USB, usually without an expansion option.
3
What is the Preferred Roaming List (PRL)?
Helps phones connect to the right tower; updated over the air.
4
What is Mobile Device Management (MDM)?
Centralized control of company and personal devices, including policies and app access.
5
Name two connectionless protocols.
DHCP, TFTP.
6
Name two connection-oriented protocols.
DHCP, TFTP.
7
What does a PoE injector do?
Adds power to an Ethernet cable.
8
What is the power capacity of PoE (IEEE 802.3af)?
15.4 watts, 350 mA maximum current.
9
How much power does PoE+ (IEEE 802.3at) provide?
25.5 watts, 600 mA maximum current.
10
What is Software-Defined Networking (SDN)?
Turns physical networking into a cloud-managed software platform.
11
What does SCADA stand for, and what is its purpose?
Supervisory Control and Data Acquisition; manages industrial machines in real time.
12
What are embedded systems?
Answer: Purpose-built devices.
Answer: Purpose-built devices.
Purpose-built devices.
13
List the private IPv4 address ranges.
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
14
What is the APIPA range?
169.254.0.1 - 169.254.255.254.
15
What is a TPM?
Trusted Platform Module; handles encryption, supported by the motherboard.
16
What is a redundant power supply?
Two or more power supplies sharing the load, hot-swappable.
17
What is jitter in networking?
Variable delay between frames, causing missed information.
18
What is latency?
Delay between a request and a response.
19
What is a Type 1 hypervisor?
Bare metal; runs directly on hardware.
20
What is a Type 2 hypervisor?
Runs on an operating system as a software layer.
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