Module 1 Lecture 5 Flashcards
(16 cards)
1990/2020:
First web browser, called worldwideweb/Global internet population of 4.5 billion.
Wired internets:
Cable, DSL, Fiber, electrical wiring.
Wireless internets:
Satellite, radio, cellular, Wi-Fi.
Internet can be accessed by:
Electricity, light, and radio.
Technology situation will change in the future:
More devices connected to internet, bigger homes, more people in family, more complex technology, technology will become smarter, cybersecurity will become a bigger issue.
Top technical challenges in a home this week:
Whys the Wi-Fi not working, the printer isn’t working, I can’t find my charging cord, I need you to improve this app, the smart lights are being dumb, what is our HBO Max password, I need to get through to the VPN at work, how do I connect my smartphone to my camera, how do I get the Fire TV to work with Alexa and the fire blaster and the TV?
Bandwidth considerations:
Broadband connection into house is 100-200 MB/Second, Wi-Fi bandwidth speed is 802.11ac – 1.3 GB/Second, wired network is 1 GB/second, 4k streaming is 25 MB/second.
Internet protocols:
TCP/IP layers, moving up and down protocol layers.
Analogy for layers:
The Link Layer is your vehicle, the Internet Layer is the address of your destination and your map, the Transport Layer is the road you travel on, the Application Layer is your reason for traveling.
Internet Protocol address (IP):
A unique string of numbers separated by periods that identifies each computer using the internet.
Bandwidth isn’t what is seems to be:
1 GB ethernet is not going to transfer a 1 GB file in one second due to latency and traffic, and analogy would be water in your house.
Dynamic IP address:
From your Internet service provider, from your WiFi router, DHCP server- dynamic hose configuration protocol.
Static IP addresses:
When you need a permanent static IP address; people can find you or you can find a device, website, mail server, server in your home, printer in your home, FTP server.
Transmission control protocol (TCP):
TCP is a connection-oriented protocol, meaning a connection is established and maintained until the application programs at each end have finished exchanging messages. It determines how to break application data into packets that networks can deliver, sends packets to and accepts packets from the network layer, manages flow control, and – because it is meant to provide error-free data transmission – handles retransmission of dropped or garbled packets as well as acknowledgment of all packets that arrive.
Application protocols:
Telnet, FTP, HTTP, Email; Pop3, SMTP, IMAP.
HTTP, HTML, HTTPS
Hypertext Transfer Protocol, Hypertext Markup Language – Web Site Demo (optional exercise), Hypertext Transfer Protocol Secure
