Module 1: Computer Networks and Security Flashcards
it is a worldwide collection of interconnected networks, cooperating with each other to exchange information using common standards
Internet
four network types
small home network
small office and home office network
medium to large network
internet
Network type that is used by corporations and schools, can have many locations with hundreds or thousands of interconnected hosts.
medium to large network
Network type that is a network of networks that connects hundreds of millions of computers world-wide.
internet
Network type that connects a few computers to each other and to the internet.
small home network
Network type that allows computers in a home office or a remote office to connect to a corporate network, or access centralized, shared resources.
small office and home office network
What are example of mobile devices
smart phone
tablet
smartwatch
wearable computer
A mobile device that is in the form of glasses, such as Google Glass, contains a tiny screen that displays information to the wearer in a similar fashion to the Head-Up Display (HUD) of a fighter pilot.
wearable computer
A mobile device that can help people who are wearing the device to track their health.
smartwatch
A mobile device that combine the functions of many different products together, such as a telephone, camera, GPS receiver, media player, and touch screen computer.
smart phone
A mobile device that come with on-screen keyboards, so users are able to do many of the things they used to do on their laptop computer, such as composing emails or browsing the web.
tablet
What are example of connected home devices
security system
household appliance
smart television
gaming console
A connected home device that can be monitored and configured remotely using a mobile device, such as lighting and climate controls.
security system
A connected home device that can be connected to the internet such as refrigerators, ovens, and dishwashers
household appliance
A connected home device that can be connected to the internet to access content without the need for its service provider equipment.
smart television
A connected home device that can connect to the internet to download games and play with friends online.
gaming console
Give example of other connected devices
smart car
radio frequency identification tag
sensor
medical device
A connected device that can connect to the internet to access maps, audio and video content, or information about a destination.
smart car
A connected device that can be placed in or on objects to track them or monitor sensors for many conditions.
radio frequency identification tag
A connected device that can provide users or medical professionals with direct feedback or alerts when vital signs are at specific level.
medical device
A connected device that can provide temperature, humidity, wind speed, barometric pressure, and soil moisture data
sensor
Three types of personal data
Volunteered data
Observed data
Inferred data
A type of data that is created and explicitly shared by individuals, such as social network profiles.
Volunteered data
A type of data that is based on analysis of volunteered or observed data.
Inferred data
A type of data that is captured by recording the actions of individuals, such as location data when using cell phones.
Observed data
It refers to the physical medium on which the signals are transmitted.
media
Three common methods of signal transmission used in networks
Electrical signal
Optical signal
Wireless signal
Method of signal transmission where transmission is achieved by representing data as electrical pulses on copper wire.
Electrical signal
Method of signal transmission where transmission is achieved by using infrared, microwave, or radio waves through the air.
Wireless signal
Method of signal transmission where transmission is achieved by converting the electrical signals into light pulses
Optical signal
Computers and networks only work with this number system
binary digit
it is the capacity of a medium to carry data.
bandwidth
It is the measure of the transfer of bits across the media over a given period of time.
throughput
It refers to the amount of time, including delays, for data to travel from one given point to another
latency
A computer host that have software installed that requests services from the server.
client
A computer host that have software installed which provides information to other hosts on the network.
server
Three types of server
email
web
file
An application that allows a device to act as both a client and a server within the same communication.
peer-to-peer (P2P)
Three categories of hardware components
end devices
intermediate devices
network media
These devices form the interface between users and the underlying communication network
end devices
A device where the voice signal is relayed from one tower to another tower until it is delivered to its destination.
mobile phone
Mobile phones are often referred to as “_____” because the geographic area in which an individual tower can provide a signal to a phone.
cell phones
Mobile phones use _____ to transmit voice signals to antennas mounted on towers located in specific geographic areas.
radio waves
What are other examples of wireless network?
global positioning system
wi-fi
bluetooth
near field communication
A wireless technology that allows devices to communicate over short distances.
bluetooth
A wireless technology that uses satellites to transmit signals that cover the globe.
global positioning system
A wireless technology that lets the phone connect to local networks and the internet.
wi-fi
A wireless technology that enables data to be exchanged by devices that are in very close proximity to each other, usually less than a few centimeters.
near field communication
What are main categories of LAN components?
hosts
peripherals
network devices
network media
A main category of LAN component that sends and receives user traffic.
host
A main category of LAN component that relies on their connected host to perform all network operations.
peripheral
A main category of LAN component that is a generic name for most end-user devices.
host
A main category of LAN component that do not communicate directly on the network.
peripheral
A main category of LAN component that moves and controls network traffic.
network device
Examples of this main category are hubs, switches, and routers.
network device
Examples of this main category are personal computers and network attached printers.
host
Examples of this main category are cameras, scanners, and locally attached printers
peripheral
Examples of this main category are copper, fiber optic, and wireless technologies
network media
A main category of LAN component that provides connections between hosts and network devices.
network media
A main category of LAN component that connect other devices, mainly hosts.
network device
To physically connect to a network, an end-user device must have a _______ and some configuration of the operating system so that the device can participate in the network.
network interface card (NIC)
This identifies the host on the network.
IP (internet protocol) address
This is used to identify the network on which the host is connected.
subnet mask
This identifies the networking device that the host uses to access the internet or another remote network.
default gateway
What is the protocol used to dynamically assign address to devices in a network.
dynamic host configuration protocol
It shows where the wiring is installed and the locations of the
networking devices that connect the hosts.
physical topology
A topology shows how network devices connect.
physical topology
A topology that illustrates the relevant network configuration information.
logical topology
What are the most common network cables?
twisted-pair cable
coaxial cable
fiber-optic cable
This cable is constructed of either glass or plastic and it is immune to EMI and RFI.
fiber-optic cable
This network cable was one of the earliest network cabling types developed.
coaxial cable
This cable is used by cable television companies to provide service and for connecting the various components that make up satellite communication systems.
coaxial cable
This cable consists of one or more pairs of insulated copper wires that are twisted together and housed in a protective jacket.
twisted-pair cable
This cable uses pulses of electricity to transmit data.
twisted-pair cable
Data transmission over copper cable is sensitive to ____________.
electromagnetic interference (EMI)
A source of interference that occurs when cables are bundled together for long lengths.
crosstalk
two commonly installed types of twisted-pair cable
Unshielded twisted-pair (UTP)
Shielded cables (STP)
A type of twisted-pair cable that is used almost exclusively in European countries.
Shielded cables (STP)
A type of twisted-pair cable that is used to connect workstations, hosts and network devices.
Unshielded twisted-pair (UTP)
A type of twisted-pair cable that is the most common in North America and many other areas.
Unshielded twisted-pair (UTP)
A twisted-pair cable that consists of 4 pairs of twisted cables.
Unshielded twisted-pair (UTP)
A twisted-pair cable that are immune to EMI and RFI interference.
Shielded cables (STP)
This cable provides improved shielding compared to UTP and can therefore carry more data.
Coaxial cable
This cable that is used to directly connect unlike devices.
straight-through cable
A UTP cable that is used for voice communication.
category 3
A UTP cable that supports 1000Mb/s.
category 5e
A UTP cable that is manufactured with higher standard than Cat 3 to allow for higher data transfer rates
category 5
A UTP cable that supports 100Mb/s to 1000Mb/s.
category 5
This cable carries data in the form of electrical signals.
coaxial cable
This cable transmit data using pulses of light.
fiber-optic cable
A part of fiber-optic cable that tends to act like a mirror.
cladding
A part of fiber-optic cable that protects the fiber against abrasion, moisture, and other contaminants.
jacket
A part of fiber-optic cable that surrounds the buffer, prevents the fiber cable from being stretched when it is being pulled
strengthening material
A part of fiber-optic cable that helps shield the core and cladding from damage.
buffer
A part of fiber-optic cable where light pulses travel.
core
What are the 2 TIA/EIA standards (wiring scheme) are widely implemented for typical Ethernet installation?
t568a
t568b
A utility that can be used to test end-to-end connectivity between the IP address of the sending host and the IP address of the destination host.
ping
A command that displays each hop along the way and the time it takes for the message to get to that network and back.
traceroute
Each individual network through which the message travels is referred to as a ____.
hop
A utility that traces the route a message takes from its source to the destination.
traceroute
A command that measures the time that it takes test messages to make a round trip from the source to the destination, and whether the transmission is successful.
ping
The traceroute utility is called ____ in the Windows environment.
tracert
