Flashcards in 1001 Deck (74)
Advantages of LCD
- Low power Usage
- Relatively Inexpensive
Disadvantages of LCD
- Struggles to display true black due to backlight
- Requires seperate backlight
- Difficult to replace
How does OLED work?
- Organic compounds that emit light when receiving an electric current.
Advantages of OLED
- Thinner and lighter
- No glass required
- No backlight leading to better colour representation
Disadvantages of OLED
- Organic materials decay over time
- Decayed images can remain on screen
- Power Hungry
Keyboard hotkey for dual display options
FN + F4
What is a LCD Switch?
Displays to another screen when laptop is closed. Physical switch on older systems but newer ones use a magnetic strip. Functionality can be altered in the BIOS.
What are the possible wireless control options on a laptop?
What does GPS stand for?
Global Positioning System
How do GPS devices work?
Location is determined via GPS signal. GPS requires periodic updates and needs a view of the sky.
What are the different types of headsets?
Hands-free audio (earphones + microphone)
What is the a TRRS connector?
Also known as 3.5mm jack.
Used in wired headsets
Whats the difference between a Screen Protector and a Device Protector?
Screen protector covers the screen. It prevents scratches but can be difficult to install.
A device protector wraps around the entire device. It can be waterproof but tends to cause an issue for docks/wireless chargers.
How can credit card readers connect to a phone?
- Audio/mic connections (TRRS Jack)
- Lightning connector
What type of network is Bluetooth?
PAN (Personal area network)
What is PRL
Preferred roaming list.
What are the types of cellular networks?
GSM - Used globally
CDMA - Used in American & Russia. Higher capacity (uses whole band).
No SIM so is locked to network provider.
What are PRI updates?
Product Release Instructions.
Updates specific radio settings such as ID numbers, network codes, country codes.
Updated over the air.
What are the two ways used to identify mobile devices.
IMEI - International Mobile Station Equipment Identity.
- Identifies phones.
- Unique to each phone
IMSI - International Mobile Subscriber Identity
- Identifies user of the network.
- Common on SIM Card (allows data etc to be carried over as SIM card does).
What is FTP?
- File Transfer Protocol
- Allows the transfer of files between Systems.
- Can be encrypted using username/password
- Supports anonymous log in (anon username any password)
- Full featured functionality - allows control of files on target system.
What is the tcp/20 port?
FTP Active mode data port
What is tcp/21 port?
FTP Control port
What is SSH and how does it work?
- Secure Shell
- Encxrypted communication link via console.
- Looks and acts the same as Telnet
What is Telnet?
- Telecommunication network
- Older version of SSH, used in legacy devices with no SSH support.
- Allows login to devices remotely and is not encrypted.
What is SMTP?
- Simple mail transfer protocol
- Server to server email transfer.
- Commonly used to send mail from a device to a mail server (computers and mobile devices)
Name what technologies belong to which protocol:
tcp/20 - FTP Active protocol
tcp/21 - FTP control protocol
tcp/22 - SSH (Secure Shell)
tcp/23 - Telnet (Telecommunication Network)
tcp/25 - SMTP
tcp/80 - HTTP
tcp/110 - POP3
tcp/143 - IMAP4
tcp/389 - LDAP
tcp/443 - HTTPS
tcp/427 - Service Location Protocol
tcp/445 - NetBIOS-less
tcp/548 - Apple Filing Protocol
tcp/3389 - RDP
udp/53 - DNS
udp/67 - Dynamic Host configuration protocol #1
udp/68 - Dynamic Host configuration protocol #2
udp/137 - Netbios Datagram Services
udp/138 - Netbios Session service
udp/161 - SNMP Queries
udp/162 - SNMP Traps
udp/427 - Service Location Protocol
What are the alternatives to SMTP (2)
What is DNS and how does it work?
Domain Name System
- Upon typing URL sends request to DNS server which responds with required IP for webserver.
What does tcp stand for?
Transmission control protocol