Leson 6: Acronyms And Definitions

Question 1

CIFS

Answer 1

Common Internet File System

Question 2

URL

Answer 2

Uniform Resource Locator

Question 3

MSA

Answer 3

Message submission agents

Question 4

NAS

Answer 4

network access server

Question 5

NAP

Answer 5

network access point

Question 6

TTY

Answer 6

teletype device

Question 7

what is the TTY?

Answer 7

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.

Question 8

MIB

Answer 8

management interface base

Question 9

what is a MIB?

Answer 9

database that holds statistics relating to the activity of the device.

Question 10

what is port address translation (type of NAT)

Answer 10

maps a networks private internal IPv4 addresses to a single public IP address

Question 11

what is overloading network address translation?

Answer 11

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

Question 12

what is DLP data leak/loss prevention?

Answer 12

scan outgoing traffic for information that is marked as confidential or personal.

Question 13

DLP

Answer 13

Data Leak/Loss Prevention

Question 14

what is an embedded system?

Answer 14

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.

Question 15

ICS

Answer 15

industrial control system

Question 16

ICS is what?

Answer 16

controls machinery used in critical infrastructure

ex: power suppliers, water suppliers, health services, telecommunications, and national security services.

Question 17

PLC

Answer 17

programmable logic controllers

Question 18

What are PLC’s

programmable logic controllers.
embedded in ICS industrial control systems

Answer 18

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.

Question 19

OT

Answer 19

operational technology

Question 19

HMI

Answer 19

human machine interface

Question 20

what is a HMI?

human machine interface

Answer 20

local control panel
software running on a computing host.

Question 21

SCADA

Answer 21

supervisory control and data acquisition

Question 22

What is SCADA?

Answer 22

type of industrial control system that manages large-scale, multiple-site devices and equipment spread over geographically large areas from a host computer.

Question 23

what is port flapping?

Answer 23

network error where a port transitions rapidly between up and down states.

Question 24

RSSI

Answer 24

received signal strength indicator

Question 25

what is RSSI

Answer 25

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

Question 26

what is jitter?

Answer 26

(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.

Question 27

QoS

Answer 27

Quality of Service

Question 28

what does QoS mean in relation to VOIP?

Answer 28

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.

Question 29

Troubleshooting Limited Connectivity:

in Windows, what does a limited connectivity message mean?

Answer 29

the host can establish a physical connection to the network but has not received a lease for an IP configuration from the DHCP server.