1.5 Flashcards
(23 cards)
Network Maps
Logical vs Physical
Physical-how devices are connected physically
Logical- how network is laid out across a large area, or for use with virtualized equipment.
Star Network
All devices connected to central device
Ring
All devices connected to each other in ring form
Still used in MANs and WANs
Dual rings can be used for built in fault tolerance
Mesh
Many different links
Fully connected or partially connected
Redundancy and load balancing
Used in WANs
Bus
Coaxial cable shared by clients
CAN bus (cars)
Wireless Infrastructure
All devices communicate through an access point
Most common
Wireless Ad hoc
No pre-existing infrastructure
Devices communicate amongst themselves
Wireless Mesh
Ad hoc devices work together to form mesh “cloud”
Can self form and self heal
LAN
Local is relative
Could be a building or group of buildings
Ethernet or 802.11 wireless
WLAN
Wireless 802.11
Within a building
Extend coverage with wireless access points
MAN
Metropolitan Area Network
City-wide network, larger than LAN smaller than WAN.
Metro ethernet, usually owned by governments
WAN
Spans the globe
Generally connects LANs, slower speeds than LAN
CAN
Campus area network
A group of buildings close to each other
Connect all buildings with fiber
NAS vs SAN
Network Attached Storage
Connect to a shared storage device across the network
File level access, must change whole file
Storage Area Network
Block level access, basically extension of your computer
Both require a lot of bandwidth, common to use on a separate network and connect via high speed
PAN
Your own private network
Bluetooth, IR, etc
IoT
Internet of Things
Wearable technology
Home automation
Z-Wave
Home automation
Control lights, locks, etc
Connects via wireless mesh
900 MHz on ISM band (industrial, scientific, medical)
ANT/ANT+
2.4GHz ISM band
Fitness and health devices
No encryption and could be jammed
Bluetooth
Connects many devices, type of PAN
NFC
Near field communication
Two way wireless, builds on RFID
Payment systems
NFC helps with other technology, Bluetooth, mobile token
IR
Control entertainment centers
RFID
Radio-frequency identification
It’s everywhere, badges, pet id
Powered by radio energy sent to tag
802.11
Wireless managed by IEEE 802 committee
Look for Wi-Fi trademark
