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BTM200 > 6 Comms > Flashcards

6 Comms Flashcards

1
Q

WAN

A

Country or world

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2
Q

Metropolitan area network

A

City or suburb

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3
Q

Local area network

A

Office, building

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4
Q

Client-server LAN

A

Clients use server

Allows users to share files and programs

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5
Q

Peer to peer LAN

A

No server
Less secure
Less stable

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6
Q

Node

A

Any device attached to network -

Printers included

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7
Q

Packets

A

Fixed-length block of data for transmission

1000 bytes

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8
Q

Protocols

A

A set of conventions governing the exchange of data between hardware and software components in a network

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9
Q

Switch

A

A device that connects computers to a network and facilitates communication by sending messages between send and receiver nodes

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10
Q

Bridge

A

An interface used to connect two similar networks

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11
Q

Gateway

A

An interface permitting communication between dissimilar networks

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12
Q

Router

A

Specialized devices for transmitting data, physical devices that join multiple networks

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13
Q

Backbone

A

The main highway - including gateways, routers - that connects all computer networks in an organization

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14
Q

Topology

A

Layout of a network

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15
Q

Star network

A

All computers and directly connected to a central network switch
Phone networks

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16
Q

Ring network

A

All microcomputers are connected in continuous loop
If one stops working…
Flows one way

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17
Q

Bus network

A

All nodes are connected to a single wire or cable.
Two endpoints, or terminators, which stop the network signal.
Each comms device on the network transmits electronic messages to other devices
Messages can collide without special software and hardware
Limited to 20 devices on 185 m cable
If one removed…

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18
Q

Tree network

A

Bus network of star networks

University departments linked by main bus

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19
Q

Mesh network

A

Each node has more than one connection to the other nodes
A message can take any possible shortest route
Internet

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20
Q

Twisted-par wire

A

Phone line
2 strands of insulated copper wire
Slowest, 128 megabits/sec

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21
Q

Coaxial cable

A

Insulated copper wire in metal shield and plastic
Cable TV and internet
Shielded

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22
Q

Fiber optic cable

A

Up to 2 billion pulses per second

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23
Q

Ethernet

A

Cat5

Requires cables, a few routers

24
Q

Phone line network

A

HomePNA tech

320 megabits/sec

25
Q

Power line

A

HomePlug

200 megabits/sec

26
Q

Narrowband

A

For voice and phone

27
Q

Broadband

A

1 gigabit/sec

28
Q

Wireless application protocol

A

A standard designed to link all mobile devices to carrier’s wireless network

29
Q

Wireless types

A 
IR
Broadcast radio
Cell radio
Micro radio (Bluetooth)
Communications satellites
30
Q

Satellites

A

Geo highest
Meo 10 000 miles
Leo 1000 miles

31
Q

Generations

A 
1 - analog cell
2 -digital cells and pdas
3 - smartphones
4 smarter phones
LTE long term evolution
32
Q

Short-range wireless

A

LAN - to 228 feet. Wi-fi
Personal area networks - to 33 ft. Bluetooth, wireless USB
Home automation networks - to 150 ft.

33
Q

Wireless standards

A
  1. 11b home
  2. 11a business
  3. 11g over 54 mbps
  4. 11n over 600 mbs
34
Q

WiMax

A

Worldwide interoperability for microwave access

Up to 30 miles. More than wifi

35
Q

Ultra-wideband

A

Military radar

36
Q

Smart home

A

Insteon
\zigbee
Z-wave

37
Q

Trolls

A

Comments

38
Q

Hackers

A 
Script kiddies
Hacktivists - Anonymous
Black-hat hackers
Cyberterrorists
Benign hackers
Benevolent hackes
39
Q

Worm

A

Subclass of virus that copies itself repeatedly into computer’s memory

40
Q

Rootkit

A

Secret program installed in OS so someone can take control

41
Q

Zombie

A

Computer taken over covertly and programmed to respond to instructions sent remotely

42
Q

Botnet

A

Robot network waiting for commands

43
Q

Pharming

A

Malicious software in your computer redirects you to an impostor web page

44
Q

Evil twin attack

A

Fake wifi hot spot that your computer thinks offers safe access to a secure public network and then monitors your communications and steals data you input

45
Q

CERT

A

Computer emergency response team

USDDept

46
Q

Tools for fighting online fraud

A 
Rule-based detection software
Predictive statistical model software
Employee internet management software
Internet filtering software
Electronic surveillance
47
Q

Prism

A

Uses online data from 9 companies - google, fb, apple about the online activity of customers

48
Q

XKeyscore

A

Allows analysts to search with no authorization through dbs containing emails, chats, browsing histories

49
Q

FISA court

A

Foreign intelligence surveillance act court,

Group of 11 judges responsible for making decisions about gvt surveillance in ns cases

50
Q

Nsa

A

Gathers intell by targeting computers and comms of foreign entities
Protects nsa’s and military’s computers
Mines metadata

51
Q

Privacy and civil liberties oversight board

A

No power

52
Q

Tailored access operations unit

A

Harvests from overseas networks

53
Q

Switch

A

Transfers data packets between 2 networks

54
Q

Not a standard

A

802.11ac

55
Q

RAID 0

A

Automatically duplicates your data and saves it on 2 identical drives

56
Q

SDRAM

A

The most common type of RAM in current systems

57
Q

Virus

A

Means same thing as worm

BTM200 (6 decks)

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