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Network+ | 01.Basics Cheat Sheet by

CompTIA Network+ certification course sum up. Oriented for cybersecurity later courses.

Network Components

Client
end-user access
Server
provides resources to network
Hub
connects devices - rebroa­dcast data
Switch
idem but uses selective adressing (IP/MAC)
Wireless Access Point
(WAP) - wireless hub
Media
connecting media (cables, waves, electr­icity, ...)
WAN Link
DSL, Cable, leased lines, satellite, cellular, MW, ...

Wired Network Topologies

can be
physical (cabling) or logical (traffic flow)
Bus
backbone cable, old, single collision domain
Ring
circular loop, singular direction
 
token ring = devices wait their turn
 
FDDI (fiber) = 2-counter rotating, redundancy
Star
connected to central device, SPOF!
Hub & Spoke
Star topology with WAN i.o. LAN (hubs)
Full-Mesh
rendun­dant, everyone is connected, efficient, very expensive
Partial-Mesh
hybrid of Full-Mesh and Hub&Spoke

Wireless Network Topologies

Infras­tru­cture Mode
most common, cenralized mgmt, uses wireless securtiy control
Ad Hoc
P2P connec­tions, no routers
Wireless Mesh Topology
Different type of nodes or devices, client­-ro­ute­rs-­gatways
 

Network Resources

Client­/Server
Def
uses servers to provide access to files, printers, etc
 
+
centra­lized, easier mgmt, scalable
 
-
high cost, dedicated resources, network operating system
Peer-t­o-Peer
Def
Peers share resources directly to others
 
+
lower cost, no dedicated resource, no specia­lized system
 
-
decent­ralized mgmt, inefficent for large NW, poor scalab­ility

Network Geography

PAN
Personnal
bluetooth, cellphone, usb drive, watch
LAN
Local
limited distance, ethernet (802.3), WIFI (802.11),
CAN
Campus
connects several buildings, camps, MIL bases, schools
MAN
Metrop­olitan
up to 25-mile radius like city depart­ments, community over a region
WAN
Wide
across country, world, uing leased lines or VPN

Internet of Things (IoT)

802.11 WIFI
operates infras­tru­cture or ad-hoc
Bluetooth
low energy, mesh network, pairing sys
RFID
electr­oma­gnetic fields, ie badge reader
NFC
RFID but 4cm range, more precise
IR Infrared
in line-o­f-sight
Z-wave
short range, low-la­tency data transfer for home automation
Ant+
sensor data for remote control systems
 

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