What does SATA stand for? - ANSWER Serial advanced technology connection
What does PCI stand for? - ANSWER Peripheral component interconnect, legacy
Type of communication of PCI? - ANSWER 32bit and 64bit parallel communication
Voltage of PCI? - ANSWER 3.3V and 5V
What is the NFC range? - ANSWER 4cm
What does LCD stand for and how does it work? - ANSWER Liquid crystal display, light
shines through liquid filters
What are the types of LCD and what do they stand for? - ANSWER TN = twisted
nemantic
IPS = in plane switching
VA = vertical alignment
Difference between different LCD types? - ANSWER TN = better response time, bad
wide angles, low power
IPS = better colors, more expensive, good angles
VA = best contrast, bad angles
1
,Different types of LCD backlights? - ANSWER CCFL = cold cathode fluorescent lamp
LED
What is special about CCFL? - ANSWER Uses AC power when the computer requires
DC, so need an inverter
How many pins is USB-C? What makes it special? - ANSWER 24pins, can be used to
transmit other signals (HDMI, DisplayPort)
What was used before USB connectivity and with what kind of signal? How many pins? -
ANSWER DB-9 cable with RS232 signal, 9pin
What kind of stylus' are there? - ANSWER Capacitive stylus = touch pen
Active stylus = apple pencil, can communicate independently of the screen
What is the older type of headset connection? With what type of signal? -
ANSWER 3.5mm TRRS (tip ring ring sleeve) with an analog signal
What were the 2G networks? What did they stand for? - ANSWER GSM = global
system for mobile communication
CDMA = code division multiple access
What companies used GSM and how did it work? - ANSWER AT+T and T-Mobile, has
multiplexing
What does multiplexing mean? - ANSWER Multiple data signals use the same channel
without interference
What companies used CDMA? How did it work? - ANSWER Verizon and Sprint, each
person used a different code
2
,What was the purpose of 4G? What did it stand for? - ANSWER To combine GSM and
CDMA, LTE = long term evolution
What does EDGE stand for? - ANSWER Enhanced data rates for GSM evolution
What is PRL? How does it update? - ANSWER Preferred roaming list, so your cell
phone can connect to the right tower, updates OTA (over the air)
How does GPS work? - ANSWER 30 satellites in the air, your device needs to see 4 for
accurate location
What does MDM stand for? And do? - ANSWER Mobile device management,
companies can manage user devices through one console
What is meant by a partition? - ANSWER Keeping company data and private data
separate
What are the two types of IP payloads? What do they stand for? - ANSWER TCP =
transmission control protocol
UDP = user datagram protocol
What does in the clear mean? - ANSWER Not encrypted
Why not just have the IP payload? - ANSWER TCP and UDP allow for multiplexing with
different applications and ports
How does TCP work? - ANSWER Requires formal setup/teardown process to establish
protocol, called a reliable system because will make sure data reaches server, also has flow
control to make sure one side is not getting data too quickly
3
, Examples of TCP? - ANSWER HTTPS = hypertext transfer protocol secure
SSH = secure shell
How does UDP work? - ANSWER No formal setup process, no confirmation of data
sent, for real time communication
Examples of UDP? - ANSWER DHCP = dynamic host config protocol
TFTP = trivial file transfer protocol
What are the different kinds of ports? - ANSWER Non-ephemeral (permanent port) =
same port for the same service
Ephemeral = client side port that changes
What is a key fact about ports? About TCP and UDP using ports? - ANSWER For
communication, not security
TCP and UDP can use the same port numbers at the same time
FTP? - ANSWER File transfer protocol tcp/20 tcp/21 file transfer between systems
Telnet? - ANSWER tcp/23 in the clear remote command console access
SSH? - ANSWER Secure shell tcp/22 encrypted communication for command console
SMTP? - ANSWER Simple mail transfer protocol tcp/25 only sending mail not receiving
DNS? - ANSWER Domain name system udp/53 converts web addresses to IPs and vice
versa
4
What does PCI stand for? - ANSWER Peripheral component interconnect, legacy
Type of communication of PCI? - ANSWER 32bit and 64bit parallel communication
Voltage of PCI? - ANSWER 3.3V and 5V
What is the NFC range? - ANSWER 4cm
What does LCD stand for and how does it work? - ANSWER Liquid crystal display, light
shines through liquid filters
What are the types of LCD and what do they stand for? - ANSWER TN = twisted
nemantic
IPS = in plane switching
VA = vertical alignment
Difference between different LCD types? - ANSWER TN = better response time, bad
wide angles, low power
IPS = better colors, more expensive, good angles
VA = best contrast, bad angles
1
,Different types of LCD backlights? - ANSWER CCFL = cold cathode fluorescent lamp
LED
What is special about CCFL? - ANSWER Uses AC power when the computer requires
DC, so need an inverter
How many pins is USB-C? What makes it special? - ANSWER 24pins, can be used to
transmit other signals (HDMI, DisplayPort)
What was used before USB connectivity and with what kind of signal? How many pins? -
ANSWER DB-9 cable with RS232 signal, 9pin
What kind of stylus' are there? - ANSWER Capacitive stylus = touch pen
Active stylus = apple pencil, can communicate independently of the screen
What is the older type of headset connection? With what type of signal? -
ANSWER 3.5mm TRRS (tip ring ring sleeve) with an analog signal
What were the 2G networks? What did they stand for? - ANSWER GSM = global
system for mobile communication
CDMA = code division multiple access
What companies used GSM and how did it work? - ANSWER AT+T and T-Mobile, has
multiplexing
What does multiplexing mean? - ANSWER Multiple data signals use the same channel
without interference
What companies used CDMA? How did it work? - ANSWER Verizon and Sprint, each
person used a different code
2
,What was the purpose of 4G? What did it stand for? - ANSWER To combine GSM and
CDMA, LTE = long term evolution
What does EDGE stand for? - ANSWER Enhanced data rates for GSM evolution
What is PRL? How does it update? - ANSWER Preferred roaming list, so your cell
phone can connect to the right tower, updates OTA (over the air)
How does GPS work? - ANSWER 30 satellites in the air, your device needs to see 4 for
accurate location
What does MDM stand for? And do? - ANSWER Mobile device management,
companies can manage user devices through one console
What is meant by a partition? - ANSWER Keeping company data and private data
separate
What are the two types of IP payloads? What do they stand for? - ANSWER TCP =
transmission control protocol
UDP = user datagram protocol
What does in the clear mean? - ANSWER Not encrypted
Why not just have the IP payload? - ANSWER TCP and UDP allow for multiplexing with
different applications and ports
How does TCP work? - ANSWER Requires formal setup/teardown process to establish
protocol, called a reliable system because will make sure data reaches server, also has flow
control to make sure one side is not getting data too quickly
3
, Examples of TCP? - ANSWER HTTPS = hypertext transfer protocol secure
SSH = secure shell
How does UDP work? - ANSWER No formal setup process, no confirmation of data
sent, for real time communication
Examples of UDP? - ANSWER DHCP = dynamic host config protocol
TFTP = trivial file transfer protocol
What are the different kinds of ports? - ANSWER Non-ephemeral (permanent port) =
same port for the same service
Ephemeral = client side port that changes
What is a key fact about ports? About TCP and UDP using ports? - ANSWER For
communication, not security
TCP and UDP can use the same port numbers at the same time
FTP? - ANSWER File transfer protocol tcp/20 tcp/21 file transfer between systems
Telnet? - ANSWER tcp/23 in the clear remote command console access
SSH? - ANSWER Secure shell tcp/22 encrypted communication for command console
SMTP? - ANSWER Simple mail transfer protocol tcp/25 only sending mail not receiving
DNS? - ANSWER Domain name system udp/53 converts web addresses to IPs and vice
versa
4
