Grade 10 - Computer Networking

schoolstudycanada's version from 2017-11-30 04:52

Home network

Question Answer
What is a home network?system of connected computers
Why start a home network?share internet.
Benefits of home networkconnect devices together and/or to the internet
Things to consider when beginning a network1. equipment to be networked
2. networking adaptors
3. networking devices (router, switches)
4. internet access equipment
5. networking connection options (wired, wireless)
LANLocal Area Network
WANWide Area Network
access pointallows wireless devices to connect via radio waves
HUB- old device for connection
- "dumb" device
- basic way of linking computers together
- broadcasts information to all equipment connected to it
- slows down network
SWITCH- "smart" hub
- examines information and forwards to correct equipment
- allows equipment to send and receive information at the same time
ROUTER- connects two or more networks
- allows connection to internet
- some contain built in switch
- connects all computers to one internet connection
Why are wireless routers popular"all-in-one" functionality
- switch for wired devices
- access point for wireless
- router for sharing internet
BROADBAND MODEM- allows access to internet through telephone or cable company
- translates data from ISP into networking data
- connects to router (which broadcasts it)
DSL MODEMconnect to phone outlet
CABLE MODEMconnect to cable TV outlet
GatewayCombines router and modem into one
Network adapter- Allows connection to network
- Also known as NIC
- adapts computer to send and receive network data
PCI Network adapterinstalled in desktops
PCMCIA Network adaptersmall, credit card sized devices that plug into a notebook computer
USB Network adapterused on desktop or notebook computer.
do not require installation
Things to consider of choosing network technology- Speed
- Cost
- Ease of installation
- Appearance
- Home access
- Public access
Choosing network tech - Network speedHow fast files are delivered from one device to another
Choosing network tech - Cost- Wired is cheaper, but more wires
Choosing network tech - Ease of installation- wireless networks are easer to manage
Choosing network tech - Appearance- wireless networks look cleaner because less wires
Choosing network tech - Home Access- wireless network means access everywhere around the house
Advantages of wireless network1. Freedom to work anywhere
2. Access hotspots
3. easy to install
4. (almost) no cables
Mixed solutionRouter with both wired and wireless

Wireless Standards

Question Answer
802.11b- most established
- 11Mbs network speed
- slowest standard
- 2.4GHz frequency
- transfer of small files
802.11g- 54Mbs
- 2.4Ghz
- Compatible with 802.11b
802.11a- 54Mbs
- 5GHz
- Less chance of interference
- Not compatible for other wireless technologies

Home Security

Question Answer
Ways to secure network- Change Service Set Identifier (SSID)
- Change default passwords
- MAC Address filtering
NATNetwork Address Translation
- Protect all computers on a network
- Hides all computers "behind it" when viewing router
- Assigns new IP addresses which only it knows
SPIStateful Packet Inspection
- Inspects incoming data to check if it corresponds to outgoing data
VPNVirtual Private Network
- Allows device to access private network as-if it were physically connected
- Encrypts traffic
SSIDService Set Identifier
Name of wireless network
Firewallprotective barrier between computer and "outsiders"
Firewall types- Software firewall
- SPI Firewall
Software firewallinstalled on computer. only offers protection for individual computer
Wireless security- WEP
- MAC Address filtering
MACMedia Access Control
MAC Address filtering- Uses unique MAC Address to filter out non-existing computers
- only for wireless
WEPWired Equivalency Protocol
- Encrypts data
- Uses encryption key 64-128 bits long
- Not secure anymore
- only for wireless
WPAWi-Fi Protected Access
- Uses dynamic encryption key (changes often)
- Encrypts data
- 256 bit keys
- only for wireless

OSI Model

Question Answer
What does the OSI model offer?- standardizes interfaces
- makes modular engineering easier
- accelerates evolution in technology
Applicationprovides network services to application processes
i.e.: What the user see's
Presentation- Ensure data is readable by receiving system
- Format data
- data structures
- negotiate data transfer syntax for application layer
SessionManages sessions between applications
- opens a connection
Transport- Error correction
- Maintain virtual circuits
- Concerned with data transport issues between hosts
- i.e.: fixes errors
Network- Provides connection and path selection between two systems
- Finds fastest path
- provides connection via routers on different networks
- i.e.: path determination and IP
Data Link- LLC and MAC
- Reliable transfer of data across media
- Physical addressing
Physical- Binary transmission
- wires, connectors, data rates