Informatics 3a- Networking Flashcards
1
Q
networking
A
- connecting to other items
- talking to other items
- privilege’s define what you can get into -> what you have access to
- interconnected collection of autonomous computers and peripheral devices
2
Q
informatics
A
- increase productivity of everyone else
- decrease productivity of doctors
3
Q
Local area network (LAN)
A
- talking only to people in this classroom
- people on stony brook can only talk to people on stony brook
- talking to only one person -> no one else can join in
- ex. stony brook hospital
4
Q
Wide area network (WAN)
A
- talking to people outside the classroom
- people from stony brook can talk to people outside of stony brook
- you and someone else talking to each other -> if other people jump in it becomes wide area
- ex. internet
5
Q
devices on a network
A
- computers- PC’s, services, workstations, mass storage devices (backup), PDA’s pocket pc’s
- printers
- point of sales devices- cash registers
- medical devices- physiological monitors, OB-CIS system, radiology (PACS), lab analyzers
- other hardware- routers, switches, bridges, firewalls, gateways, moderns, etc.
6
Q
what can you do with a network
A
- move information from system to system, data base to data base
- share resources
- share printers
- use applications that are shared on a network
- send e-mail
- participate in electronic discussion groups
- monitor and control users access to resources*
7
Q
past computer networks
A
- centralized systems
- main frame (were all the data is held) and dumb terminals
- controlled
- you have to connect a wire from the main frame to the dumb terminal in order to get access
- finite connections
- closed system
- computing takes place on the mainframe
- easier for mgmt to control
- stand alone (PCs)
- hard wired terminals connected to a central unit (mainframes)
- no hacking
- ran slow
8
Q
dumb terminals
A
- terminal that is able to see a signal
- you need to run a wire to the main frame to the dumb terminal
9
Q
current computer networks
A
- decentralized networking
- client/server computing
- computing takes place on client
- open system
- as long as you have internet and permissions you can have access
- easily hackable
- LAN and WAN
- hard to manage
- peer networks
10
Q
transmission media
A
- network components
- wired media (phone line, DSL)
- coaxial cable
- fiber optic media
- radio media
11
Q
transmitters/receivers
A
- network components
- network interface cards
- modems
- bridges
- gateways
- routers
12
Q
network operating system
A
- authentication
- file security- different roles, different access
- connection to resources
- running in the background
13
Q
authentication
A
- network operating system
- username and password
- based on the authentication it defines what you can access and where you can go
- very important for healthcare
- file access
- how much speed you get*
14
Q
wired media
A
- one or more strands of metal
- conductors of electricity
- data are transmitted along these conductors in the form of changing electrical voltages
- copper wire transmits electrical signal
- signal strength
- if youre using a copper wire -> after a certain amount of distance it starts losing its speed****
15
Q
twisted pair cable
A
- has a special conducting layer located within the insulation -> makes the cable less susceptible to interference -> shielding
- wires need to be shielded
- electromagnetic wires are susceptible to interference -> need to be shielded -> keeps cable from emitting energy that would interfere with other nearby equipment
- shielding leads to thickness
-after 320 ft the signal deters 50% or greater -> needs to be plugged in again to revamp
