Transcript CS101 Lectures 18&19

CS101
Network Basics
Computers love bytes and a factor of ____
Up to now we have been using bytes as our main unit of
measurement with a factor of ____
For instance storage measured in bytes
– 1 bit = 0 or 1
– 1 bit * 8 = 8 bits = one byte
– 1 byte * 1024 = 1024 bytes = 1 Kilobyte
– 1 byte * 1024 * 1024 = 1,048,576 bytes = 1 Megabyte
– 1 byte * 1024 * 1024 * 1024 = 1,073,741,824 bytes = 1 Gigabyte
– 1 byte * 1024 * 1024 * 1024 * 1024 = 1,099,511,627,776 bytes = 1 Terabyte
Networks Love Bits and a Factor of 1000
Movement measured in:
____ ___ _____ (bps)
– bps = How many bits go by a point in one second
– Also called Data Transmission Rate
•
1 bps = 1 ___ per second
•
1bps*1000 = 1000bps = 1 ___ bit per second = 1 kbps
•
1bps*1000*1000 = 1,000,000bps = 1 ___ bit per second = 1 Mbps
•
1bps*1000 *1000*1000 = 1,000,000,000bps = 1 ___ bit per second = 1 Gbps
•
etc
What is a ______?
• ________ = Devices connected together so
that they can exchange information
A network needs 3 things
• ________ ________
– Instructions to move information between
devices
• Standalone software or built into most operating
systems
• ___________
– Agree upon way to do things
• TCP/IP = Transmission Control Protocol/Internet
Protocol
• __________
– Way to move information between devices
• Wired or Wireless
Home Network Software
• Built into the operating system since
everyone wants to network related things
with their computer
– Windows = Control Panels > Network and
Internet
– Macintosh = Apple menu > System Preferences
> Network
Home Network Protocols
• Handled by the networking software
• Since everyone wants their computer to be
able to communicate with everyone else's
computer we all want to use the same
protocols
• ___/__ = ________ _______ ________/
________ _______
– About 100 protocols
• Example = http = Hyper Text Transfer Protocol to
move web pages around in an agreed upon way
To have a connection you need a
NIC
• NIC = ________ _________ _____
• A ___ allows a device like a computer,
printer, scanner, etc, to connect to a network
• A ____ has a ___ address
– Media Access Control address
– Unique address for each item on a network
• Can be found in System Information under Network
Adapter
Home network connection options
• Wired
– ________ cables
• Fast ______ 10Mbps/100Mbps
• Gigabit ______ 10Mbps/100Mbps/1000Mbps
– _______ _____ Networking (electrical system)
– ______ _____ Networking (phone system)
Home network connection options
• Wireless
– ______ either _, _, _, _, _
• A wireless router radios the information to
devices on the network.
• Each device on the wireless network needs
a wireless NIC card to receive and send
signals.
If you go wireless…
• _________ usually is off by default
• Password Protect _______
– Change default password of router
• Turn on wireless ________ and create very
long password
• WEP = Not quite as bad as nothing
• WPA = Better
• WPA2 = Best
• Think about ___ address filtering and other
options.
– Ready wireless router manual