Please enable JavaScript.
Coggle requires JavaScript to display documents.
ITCS: Networking and communications (Wi-Fi (SSID ("name" of…
ITCS: Networking and communications
Factors in internet design
No central controlling computer
Redundancy - nodes can fail and come up with alternative routes
Internet is a hierarchy of individual networks
Packet and/or Datagram
Uniformly sized chucks that information is sent over the internet
can travel through potentially unsecure routers
packet sniffing
comparmises
confidentialty
man-in-the-middle attack
comparmises
integrity
of data
Wi-Fi
wireless internet
wifi enables devices to wirelessly form a LAN
802.11 IEEE
individual nodes (eg laptop) are called "stations"
devices act as a radio station with a transmitter and receives
SSID
"name" of network"
service set identifier
set of wireless devices served by particular wireless LAN
Encryption
Turn information into different form
Can ensure
Confidentiality
Integrity
Authentication
On Wifi
WEP
serious problems
first wifi encryption method
many devices still suport WEP
WPA(2)
recommended security mechanism for wif networks
required to be compliant with 802.11
TCP/IP
TCP and IP are two important "communication protocols"
TCP
responsible for ensuring data is sent reliably
ports
indicates how data is handled when it reaches it destinations
well known ports
20 and 21 - FTP
22 - SSH for secure logins to computers
25 - SMTP
80 - HTTP
Data divided into TCP datagrams
Ensures data is received by destinations
Waits for acknowledgements
reliable but relatively slow