Network/Data Flow Flashcards
why use a network?
communication
share resources
security/backup/collaboration
what is a network?
a telecommunication made up of a collection of computers used to transfer data between endpoints using a variety of mediums and software
network types
wired
wireless
radio
infared (remote)
wired network
Ethernet: direct connection
pro: secure, speed is all yours
con: stuck to Ethernet port
wireless network
pro: convenient
con: unsecure, speed affected by other users’ speed and large influx of other users
ad hoc network
> = 2 devices
easy to set up and disassemble
limited resources, 1 person leaves their resources leave too
LAN
local area network
devices connected with network equipment
requires planning and equipment
stable resources
MAN
municipal area network
covers a particular geographical area
consists of multiple LANs
WAN
wide area network
covers large geographical area
made of multiple LANs
NFC
near field communications
short range wireless, send and receive
ex: paying with phone, tap to pay
TCP/IP
uses ip addresses to direct and send data
connection oriented/reliable
data kept in order
UDP
connectionless/unreliable
data sent out of order
data flow
data broken into packets and broken up farther in network, reassembled at destination
data sent between devices
equipment
dce dte cabling network card hub switch router hybrid
DTE
endpoints, sends and receives data
ex: pc, cellphone
DCE
connects endpoints and directs data through the network
ex: hubs, switches, routers
cabling
connects DTEs and DCEs
Ethernet (solid, plenum, stranded)
Fiber Optics
ethernet
max distance of 333 ft can be extended every 333 ft by a hub, max 3 solid: for longer distances plenum: fire rated, ceilings and walls stranded: short distance, loses signal
fiber optic
uses glass and lights
can go for miles (10-20mi)
single mode and multi mode
cable speeds
cat5: <=1 Gb/s
cat6: 1-10Gb/s
cat7: 10-100Gb/s
network card
gate keeper basic error checking (is data for me?) uses unique mac address provides: communication, encapsulation/encapsulation, CRC check 46 bytes Wired Wireless
f
f
wired network card
secure
bandwidth and speed all yours
wireless network card
unsecure: anyone can see
bandwidth and speed shared
Hub
extend wireless connections
broadcasts traffic to ALL and remembers NOTHING
switch
uses mac addresses to make a table of connections each packet inspected for destination can only talk to connected devices unmanaged = plug and play managed = advanced, customizable
router
uses IP addresses to communicate
gateway between networks: inspects every package
understands internal and external protocols
hybrid
router and switch
