Network Basics Flashcards
the 5 9’s
99.999% availability
5 minutes of downtime/ year
converged networks
combining multiple types of traffic: data, video and voice
client
end-user device to access network
server
provides resources to the rest of the network
email, file, web print servers
hub
old tech
just repeats signal to all ports
more network errors
wap
wireless access point
allows wireless device to connect to wired network
switch
layer 2
forward traffic based on mac address
more security and efficiently use bandwidth
router
layer 3
connects 2 different networks
forwards traffic based on ip addresses
media
connects 2 devices physically
copper, fiber, radio waves
wan link
wide area network link
physically connects networks to wan networks
leased lines, dsl, cable, etc..
client-server model
uses a dedicated server to provide resources
central admin, easier management, better scalability
costs more, dedicated resources and OS
p2p
peer-to-peer
everyone shares resources with each other directly
lower cost, no dedicated resources
bad management, poor scalability, bruh backups
pan
personal area network
smallest type
few meters
Bluetooth, usb hard drive, firewire
lan
local area network
100 meters
ethernet or wifi
ieee 802.3
ethernet
ieee 802.11
wifi
infrastructure or ad hoc
can
campus area network
square miles and buildings
connects building-centric lans across uni or business park
man
metropolitan area network
25 mile radius
scattered locations across a city
uni with multiple campuses, city departments
wan
wide area network
world
leased lines and vpns tunneled over internet
internet, international corporate networks
physical topology
how devices are physically connected by media
logical topology
how traffic flows through network
bus topology
single cable that each device taps into
single collision domain
ring topology
cable in circular loop
travels in single direction
fddi - fiber network with 2 redundant rings
token ring - wait to communicate by passing token
star topology
most popular lan
devices connect to single point
ethernet, wireless, fiber
if central fails, network fails
hub-and-spoke topology
star with wan links
full-mesh topology
most redundant
every node connects to every other node
expensive
all optimal routes
partial-mesh topology
mix of full-mesh and hub-and-spoke
optimal routes for some sites
consider traffic patterns
infrastructure mode
most common wireless network topology
wap as central point like star
ad hoc mode
decentralized wireless network
p2p connections made on the fly
no routers or access points
wireless mesh topology
interconnection of different types of devices
reliable and redundant
different radio frequencies to expand
bluetooth
low energy variant of bluetooth that allows for mesh network
rfid
radio frequency id
use electromagnetic fields to read data embedded in tags
nfc
near field communication
4cm range
ir
infared
operates with line of site
z-wave
short range, low latency, low power consumption
home automation
ant+
collection and transfer of sensor data
used with remote control systems
