Leson 6: Acronyms And Definitions Flashcards
CIFS
Common Internet File System
URL
Uniform Resource Locator
MSA
Message submission agents
NAS
network access server
NAP
network access point
TTY
teletype device
what is the TTY?
the terminal or endpoint for communication between the computer and the user.
handles text I/O between the user and the shell, or command environment.
MIB
management interface base
what is a MIB?
database that holds statistics relating to the activity of the device.
what is port address translation (type of NAT)
maps a networks private internal IPv4 addresses to a single public IP address
what is overloading network address translation?
dynamic NAT using different ports to map multiple private, local, unregistered IP addresses to a single registered IP address and distinguish which traffic belongs to which NAT IP
what is DLP data leak/loss prevention?
scan outgoing traffic for information that is marked as confidential or personal.
DLP
Data Leak/Loss Prevention
what is an embedded system?
electronic system that’s designed to perform a specific, dedicated function.
ex: such as a microcontroller in a medical drip or components in a control system managing a water treatment plant.
ICS
industrial control system
ICS is what?
controls machinery used in critical infrastructure
ex: power suppliers, water suppliers, health services, telecommunications, and national security services.
PLC
programmable logic controllers
What are PLC’s
programmable logic controllers.
embedded in ICS industrial control systems
they are linked by a cabled network to actuators that operate valves, motors, circuit breakers, and other mechanical components, plus sensors that monitor some local state such as temperature.
actuator=component of a machine that produces force, torque, or displacement, usually in a controlled way, when an electrical, pneumatic or hydraulic input is supplied to it in a system.
OT
operational technology
HMI
human machine interface
what is a HMI?
human machine interface
local control panel
software running on a computing host.
SCADA
supervisory control and data acquisition
What is SCADA?
type of industrial control system that manages large-scale, multiple-site devices and equipment spread over geographically large areas from a host computer.
what is port flapping?
network error where a port transitions rapidly between up and down states.
RSSI
received signal strength indicator
what is RSSI
signal strength as measured at the receiver, using either decibel units or an index value.
index level calculated from the signal strength level.
ie weaker signal lowers data rate
what is jitter?
(referring to problems with timing and sequence of packet delivery)
amount of variation in delay over time and measured by sampling the elapsed time between packets arriving.
QoS
Quality of Service
what does QoS mean in relation to VOIP?
switches, AP’s, and routers are all configured to identify VOIP data and prioritize it over bursty data.
bursty data=data that is transmitted as fast as possible, but the sequence in which packets are delivered and variable intervals between packets arriving don’t materially affect the application.
Troubleshooting Limited Connectivity:
in Windows, what does a limited connectivity message mean?
the host can establish a physical connection to the network but has not received a lease for an IP configuration from the DHCP server.
