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Commtech 4 > Commtech 4 > Flashcards

Commtech 4 Flashcards

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WSET ® Level 4 D2 Business of Wine flashcards
1
Q

Codec

A

Compression/decompression

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1
Q

Mpeg

A

Moving picture expert group

Name of a family of standards for coding video and audio information in a digital compressed format

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1
Q

I-picture

A

Intra-coded picture

Single compressed picture that contains all the spatial information of a video picture

Encoded as free standing image (no B-pic or P-pic reference)

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1
Q

P-picture

A

Predictive

Computed based on nearest previous I- or P-pic

More compressed than I- pictures and provide a reference for the calculations

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1
Q

B-pictures

A

Bi-directional pictures

Use both past and subsequent pictures as references to calculate the compressed picture data

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1
Q

DTCP

A

Digital transmission content protection

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1
Q

ACP

A

Analog copying & piracy

Prevents or distorts copies made over an analog connection

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1
Q

CA

A

Conditional access

The protection of content by requiring certain criteria to be met before granting access to this content

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1
Q

HTIB

A

Home theater in a box

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1
Q

Direct view tv

A

CRT
Least expensive
Highest quality picture
Size limitations

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2
Q

Rear projection tv

A

CRT,DLP, LCD,LCos

Larger screen size
Lower profile
Affordable

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3
Q

Front projection tv

A

CRT, DLP, LCFD, LCos

Largest size
Needs highly reflective screen

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4
Q

Flat panel

A

LCD, Plasma

Larger size screen
Lowest profile

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5
Q

Four actions performed by a virus

R,Ew,C,D

A

Replication, event watching, camouflage, delivery

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6
Q

Main types of viruses

E,Em,W,Th

A

Executable, email, worms, Trojan horses

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7
Q

Replication

A

Inserts copies of itself into other program files

Replicates itself

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8
Q

Event watching

A

Checks for conditions (usually a specific date)

When conditions exist, virus delivers its destructive payload.

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9
Q

Camouflage

A

Disguise themselves to avoid antivirus detection

May falsify information in header so program file appears to be the correct size

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10
Q

Delivery

A

When triggering condition is met
, virus unleashes payload

May be harmless or destructive

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11
Q

Executable virus

A

Software that piggybacks on rep programs

When program runs, the virus runs too

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12
Q

E-mail virus

A

Contained in an email or its attachments or both

Usually replicates itself by mailing itself to dozens of people in victims email address book

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13
Q

Worms

A

Software: uses computer networks and security holes to replicate itself

A copy of the worm scans the network for another machine that has a specific security hole.

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14
Q

Trojan horses

A

Small program

Claims to be something it’s not (like a game) but when it runs it does damage (sending e,ails, erasing files)

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15
Q

Spyware

A

A program that sends information about you and how you use your PC to makers and advertisers, usually without you being aware

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16
Q

Spammers target

A 
Email
Instant messaging
Newsgroup
Search engines
Blogs
Mobile phones
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17
Q

3 main types of firewall rules

A

Packet filtering
Proxy
Stateful inspection

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18
Q

MPOE

A

Minimum point of entry

Commercial demarcation point for business class digital voice

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19
Q

Telemetry cable

*Color sequence

WBBOG

A

White brown blue orange green

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20
Q

Network

A

A system of computers, peripherals, terminals, and databases connected by communications lines

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21
Q

LAN

A

Local area network

Close set of computers on a single network

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22
Q

WAN

A

Wide area network

Example Internet

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23
Q

Firewall

A

A firewall permits and blocks traffic

Hardware or software

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24
Q

VPN

A

Virtual private network

Uses a public network to establish a secure connection with an organization private network

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25
Q

NAT

A

Network address translation

Technique by which several computers share a single IP address for access to the Internet

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26
Q

PAT

A

Port address translation

Forwards requests for a particular ip port pair to another ip port pair

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27
Q

Subnetworks

A

Subnetting is the concept of partitioning large networks into smaller segments

255.255.255.0

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28
Q

Consider IP address 150.215.017.009

The first set (150.215) represents?

The second set (017.009) represents?

A

First set network

Second set define host (device)

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29
Q

IP address contained within a subnetwork

N,R,G,B

A

Network, routable, gateway, broadcast

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30
Q

Subnet mask

A

Combined with the IP address the sub IP subnet mask allows a device to know which other addresses are local to it and which must be reached through a gateway or router. a number that explains which part of an IP address comprises the network address and which part is the host address on that network.

255.255.255.0

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31
Q

Signal leakage limits at 30 m

A

15 µV per meter

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32
Q

Signal leakage limits at 3 m

A

20 µV per meter

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33
Q

Ghosts

A

Caused when a TV signal of the same frequency and video content arrives at the receiver just before or just after the desired TV signal

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34
Q

Thermal noise

A

Caused by random electron activity of the atoms that make up the conductor, resistor or any part of the passive circuit in question
Happens at any temperature above absolute zero

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35
Q

Carrier to noise

(C/N) ratio

A

The difference NP carrier level, to the noise level
Levels both are measured in dBmv
-59.2dBmv

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36
Q

Cross modulation

XMOD

A

Crossing of modulation from one channel to another

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37
Q

CTB

A

Composite triple beat
The tv carriers on a cable system are spaced in 6 MHz increments

Channels 5&6 are more than 6 MHz apart.

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38
Q

Interference threshold of beats

A

57 dB below the carrier

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39
Q

Hum mod

A

Horizontal bar

60 cycle and 120 cycle modulation of the TV carriers

Carrier to him ratio of 30 DB or better is considered acceptable

40
Q

QPSK

A

Quadrature phase shifting keying

Modulation algorithm where in the carrier is shifted in 90° Steps

41
Q

QAM

A

Quadrature amplitude modulation

Allows two channels of information to be transmitted at the same time on a particular frequency by changing the phase and amplitude

42
Q

Signal-to-noise ratio

A

A measure of signal strength relative to background noise in analog and digital communications

43
Q

NPR

A

Noise power ratio

Measures activity levels in the unused portion of multi-channel system when there is random activity in the active channel

44
Q

MER

A

Modulation error ratio

Measures the ratio of the airpower to the average power in an ideal QAM signal

45
Q

FEC

A

Forward error correction

A method where additional data bits are added to the digital video bit stream to help identify and correct any errors that may be caused by the transmission system

46
Q

BER

A

Bit error rate

Measures how often an error occurs in a given amount of data

47
Q

POP

A

Proof of performance

48
Q

Funneling effect

A

Problems in the return path adding together

49
Q

FDM

A

Frequency division multiplexing

Being able to carry and individually select different channels on a single cable by their unique frequency

50
Q

AP

A

Access point

51
Q

POS

A

Point of sale

Baud rate 9600

52
Q

LPSU

A

Local power supply unit

53
Q

CPE

A

Customer premise equipment

54
Q

eMTA

A

Embedded multimedia terminal adapter

55
Q

C-RAN

A

Converged regional area network
Provides a single common infrastructure in which all services are delivered via IP over a consistent transport and routing architecture.
CRAN connects regional markets using HE, hubs

56
Q

LCFD

A

Liquid crystal front display

57
Q

LCos

A

Liquid crystal on silicone

57
Q

DCT

A

Digital consumer terminal

57
Q

DSL

A

Digital subscriber line

57
Q

NAS

A

Network attached storage

57
Q

DMZ

A

Demilitarized zone

57
Q

MAC

A

Media access control

58
Q

DHCP

A

Dynamic host configuration protocol

59
Q

Tracert

A

Trace route

60
Q

FQDN

A

Fully qualified domain name

61
Q

Power diplex

A

Separates or combines the AC currents two parts: AC power and RF signal

62
Q

Diplex filter

A

Separates forward and return frequency

63
Q

Response equalizer

A

Used to try and correct for any undesired peaks or valleys within the passband of the amplifier

64
Q

AGC

A

Automatic gain control

Used to come it’s safer fluctuations of the input signal

65
Q

ALS

A

Automatic level and slope control

Maintains the proper tilt and output level despite changes in the input signal

66
Q

Feedermaker

A

Signal splitter device that plugs into a trunk/bridger chassis

67
Q

TP

A

Test point

68
Q

Inline conditioner

A

Contains diplex filters but allows attenuator pads to be installed in the return portion of the spectrum.

69
Q

Fiber system components

Fc,T,R

A

Fiber cable, transmitter, receiver

70
Q

Three parts of fiber optic cable

C,C,C

A

Coating, cladding, core

71
Q

Wavelengths of light used in broadband telecommunication are centered at …… nanometers and …… nanometers

A

1550 & 1310 Nanometers

72
Q

Cbone

A

The Comcast private backbone

73
Q

Ibone

A

Internet backbone

73
Q

Virus protection types

Hd,Mra,Ss

A

Signature scanners
Heuristic detectors
Memory-resident antivirus

74
Q

Main security threats

V,A,S

A

Virus
Spyware
Adware

75
Q

Mpeg picture types

A

I pictures
P pictures
B pictures

76
Q

Six key techniques for selling

B,A,L,Pp,Cb,Afs

A 
Build rapport
Ask questions
Listen
Position the product
Communicate the benefits
Ask for the sale
77
Q

Three learning styles

V,A,T

A

Visual
Auditory
Tactile

78
Q

110 punch down block is used for?

A

Data applications

79
Q

Video modulator does what?

A

Places baseband signal onto standard rf channel carrier

80
Q

Patch bay

A

Connects building data wiring to Ethernet switch! Which is a focal point in the data network.

81
Q

/29 subnet

A

255.255.255.248

5 static ip address

82
Q

/28 subnet

A

255.255.255.240

13 static ip address

83
Q

/30 subnet

A

255.255.255.252

1 static IP address

84
Q

What what a data only

Be used for

A

Fax, point of sale

84
Q

What is the MTTR for business-class voice customers

A

4 hours

85
Q

What is the maximum power consumption of an eight line EMTA

A

60 watts

86
Q

Channel deletion filter does what?

A

Deletes unused channel for the insertion of a local feed

87
Q

RJ-11 is used for what?

A

1 line telephone jack

88
Q

RJ-14 is used for what?

A

2 line telephone jack

89
Q

RJ-25 is used for what?

A

3 line telephone jack

90
Q

RJ-21x is used for what?

A

It interfaces with multiple line telephone equipment

91
Q

RJ-45 is used for what?

A

Ethernet

Straight (PC to Router) 568A
Crossover (PC to PC) 568B

92
Q

RJ-31x is used for what?

A

Connecting a monitored alarm system with line seizure.

93
Q

Beats

A

The unwanted signal entering the network can create a number of beat patterns on the tv.

94
Q

HFC

A

Hybrid fiber coax

95
Q

Core components of CRAN

H,U,S,R,R,

A 
Hub sites
U ring
S ring
Regional core
Regional network
96
Q

Name the two backbones

A

The Comcast private backbone (Cbone) comcast

The second logical backbone (Ibone) Internet

97
Q

Name the five types of maps used in designing a cable network

B,A,B,D,S

A 
Base
Strand
Design
Amp
Build
98
Q

Name the 5keys to receive information

BERVS

A

Brevity, experience, relevance, variety, self discovery.

99
Q

When verifying proper loop current for off hook status what should it be

A

33mA

99
Q

What does REN stand for?

A

Ringer equivalency number

100
Q

A basic set up rule for a 66 block is?

A

In from left out to right
Lead with the tip
Only one wire per terminal

101
Q

Heuristic detectors looks for?

A

Sections of code triggered by time or date events, searches for files such as .com, .exe, .bat, .vbs

Commtech 4 (3 decks)

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