1101 Exam Part 5 Flashcards
(23 cards)
Which kind of laptop display has a fluorescent backlight?
A LCD (TFT) with fluorescent backlight has been the standard display technology for the last few years. The backlight is a fluorescent bulb that illuminates the image, making it bright and clear. An inverter supplies the correct AC voltage to the backlight from the laptop’s DC power circuits. More modern laptops use LED displays that replace the fluorescent backlight with an LED backlight. OLED and plasma displays do not use a backlight.
Which kind of laptop display uses an inverter?
LCDs (older) use an inverter. LEDs do not.
What are the advantages and disadvantages of an IPS panel?
An in-plane switching (IPS) LCD panel uses technology designed to resolve the quality issues inherent in TN panel technology, including strong viewing angle dependence and low-quality color reproduction. IPS displays have great color accuracy, but they do not support higher refresh rates sought after by gamers.
What does TN mean when referring to an LED screen?
Twisted nematic
What kind of cable does a laptop keyboard use?
A ribbon cable. A ribbon cable is any cable with wires that run parallel on a flat plane down the length of the cable. Ribbon cables are typically used to connect internal components in laptops to save space. These laptop ribbon cables are usually hardwired into one component and connect to the motherboard or other components with a small connector clip.
What does ICS stand for?
Industrial Control System – part of the internet of things
Which two connection standards use the same port?
SFTP and SSH (they both use Port 22)
Describe POP3
The post office protocol (POP3) is a TCP/IP application protocol providing a means for a client to access email messages stored in a mailbox on a remote server over port 110. The server usually deletes messages once the client has downloaded them.
Which ports are used by NetBIOS or NetBT by default?
The network basic input/output system (NetBIOS)/NetBIOS over TCP/IP (NetBT) is a session management protocol used to provide name registration and resolution services on legacy Microsoft networks and those using WINS. NetBIOS/NetBT operates on TCP/UDP ports 137 and 139.
Name the private IP addresses
A private IP address is in the range of 10.x.x.x, 172.16-31.x.x, or 192.168.x.x. A localhost IP is 127.0.0.1. Any address from 169.254.1.0 to 169.254.254.255 is considered an APIPA address. All others are considered public IP addresses.
What is a PTR record?
PTR records are used for the Reverse DNS (Domain Name System) lookup. Using the IP address, you can get the associated domain/hostname. An A record should exist for every PTR record.
What is DHCP scope?
The DHCP scope is used as a pool of IP addresses that can be assigned automatically. The issue might be that there are no more IP addresses left in the scope, and is therefore exhausted.
What is a split horizon?
Split horizon is a method used by distance vector protocols to prevent network routing loops. With split horizon, if a router receives routing information from another router, the first router will not broadcast that information back to the second router, thus preventing routing loops from occurring.
What is an ACL?
An access control list (ACL) is a list of permissions associated with a system resource (object).
Describe Bonjour
Bonjour, Apple’s zero-configuration networking protocol, automates certain aspects of network configuration; the protocol enables devices connected to the local area network to discover and connect automatically. Businesses can use Bonjour to make the sharing of files and devices easier; the technology works with wired and wireless LANs. After enabling Bonjour on a workstation, other computers on the network can detect and install printers or scanners attached to the workstation or access files from shared folders.
What is POTS?
POTS (Plain Old Telephone System) is an older standard used for telephone systems. An RJ-11 wiring standard is used to terminate both ends of a standard phone line. This is also used for DSL lines and VoIP ATA (Analog Telephony Adapter) devices.
What cabling standards can reach 10 Gbps or greater?
To achieve 10 Gbps, you should use Cat 6a, Cat 7, Cat 8, or a fiber optic cable.
What is a rogue VM?
The process of developing, testing, and deploying images brings about the first major security concern with the virtual platform itself. This is the problem of rogue VMs. A rogue VM is one that has been installed without authorization.
What is S/MIME?
S/MIME (Secure/Multipurpose Internet Mail Extensions), a standard for the public key encryption and signing of MIME data within emails. The client may be unable to read the S/MIME contents due to a missing or corrupted digital certificate.
What is Crosstalk?
Crosstalk is defined as an effect caused by the unintentional and undesired transmission (leakage) of a signal from one cable to another. Crosstalk can occur if the twisted pairs are not twisted sufficiently, because the twisting of the cable pairs reduces crosstalk between neighboring cable pairs. The twisting is done to help cancel exterior electromagnetic interference.
What’s a common issue for fiber optic cables?
The transmit (Tx) and receive (Rx) reversed is a common issue with fiber optic patch cables.
What is a split pair error?
A split pair error occurs when one wire from each of two different pairs gets swapped identically on both ends of the cable. The result is a cable that will pass a standard continuity test, but will have serious cross-talk problems, and will most likely not perform adequately at specified data rates. Split pairs were commonly used in older Cat 3 copper networks, but are no longer used in Cat 5 or above networks.
What is a CRC error?
A cross-talk is when electrical interference data passing through can cause CRC (Cyclic Redundancy Check) errors. A CRC is used to calculate the before and after checksum is made when transferring data. If electrical interference gets in the way, such as proximity to fluorescent light bulbs, it can cause data to be corrupted and produce an error.
