Unit 8 Network Fundamentals Describe a network Explain the benefits of a network Identify risks in...
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Transcript of Unit 8 Network Fundamentals Describe a network Explain the benefits of a network Identify risks in...
• Describe a network• Explain the benefits of a network• Identify risks in computing• Describe the roles of clients & servers• List & describe types of networks• List & describe communications media &
hardware• Describe network security
Objectives
Local Area Network◦ In a small area◦ Office, school, house
WLAN◦ Wireless◦ Need Wi-Fi card
Network Types- LAN
Wide Area Network Large geographic area
◦ Two or more LANs connected by routers◦ Big businesses with office around country or
world Internet is biggest WAN Connected by fiber, satellites, telephone
Network Types- WAN
Server manages & provides a service to client
Network OS Username & password
Network Types- Client-Server
Global network of connected, smaller networks
You connect to it through an ISP World Wide Web & email are most popular
Network Types- Internet
Web based for internal company use◦ Handbooks, manuals, employment forms, work
news, etc◦ Only can access from within that company◦ Through web browser
Network Types- Intranet
Similar to Intranet
Outside users with user name & password can have access to internal info
Network Types- Extranet
Which type of network…
Has no server & all PCs are equal?◦ Peer to Peer
Is a bunch of connected LANs over a large area?◦ WAN
Can only be viewed within a company network?◦ Intranet
Review- 3Q
Modulate-Demodulate Digital to analog/analog to digital
Allows data to be transmitted over a line and changed from one signal to another
Modem
Dial-Up Modem ◦ Internal or External
◦ Data over phone lines Dialed into a phone number
◦ SLOWWWWW Old- 300 bits per second
(bps) or baud rate Now- 56k or kilobits per
second
Dial-up Modem
Data over Coaxial (Coax) cable
High speed, always on◦ Broadband◦ 20Mbps (Megabits per
second) & up
Broadband Cable Modem
Digital Subscriber Line
High speed, always on◦ Broadband◦ Through phone lines◦ 1.5-3Mbps
Can use phone & Internet at same time◦ Filters on phones
DSL Modem
Router/Multipurpose Device◦ Connects computers◦ Shares one Internet connection◦ May allows wireless access◦ Firewall
Wireless Adapters or NIC
Communication Hardware
Network devices need an IP Address & MAC Address to communicate (TCP/IP)◦ IP: 192.168.1.120 (assigned logically)◦ MAC: 0A-B5-74-C3-1E-FF (physically on NIC)
DNS◦ Translates names to IP addresses
Addressing
Which Internet connection sends high speed broadband over analog phone lines?◦ DSL
If a coax cable connects to your modem, which Internet service do you have?◦ Cable modem or FiOS
Every computer needs an ___ & ____ to communicate on a network.◦ IP address & MAC address
The 4 LAN ports on the back of a home router is really what device?◦ Switch
Review- 4Q
T or F. Hackers invade other people’s computers only for fun.
T or F. Software sharing is one of the benefits of networking.
When you are on a network, you should assume that your email is not _____________?◦ Private
T or F. It is easier for a virus to spread on a network.
Review- 5Q
How is the network at school different than your home one? ◦ How is it the same?
Which type of network has an OS & requires a username/password for access?◦ Client-server
What are two popular Internet features?◦ Email & Web
At BK, you can access the Internet with your laptop & no wires. What type of network is this?◦ WLAN
Review- 4Q
T or F. A modem converts analog to digital signals.
T or F. Hackers invade other people’s computers only for fun.
A _______ is confined to a limited geographical area.
A _______ is made up of several local area networks.
A _______ is a simple device that connects multiple computers together.
Review- 5Q
Dial-Up◦ Slow◦ Telephone Lines
Broadband◦ High Speed◦ Always On◦ Cable, DSL, Satellite
Cable, Phone, Dish/Air, Fiber Optics Wi-Fi
◦ Wireless access◦ Public (Starbucks)
ISP Services
ISDN (Old)◦ Faster than dial-up, over phone line
T1◦ High speed for business (1.5Mbps)◦ Dedicated fiber optic line
FiOS◦ Faster speed over fiber◦ Comparable to Cable modem◦ Limited areas
Other Types of Connections
Control access to computer◦ User name, passwords◦ If none, unauthorized people can gain access &
take/read valuable info OR change it so no one can use it
Passwords◦ Change often◦ Use upper & lowercase letters, numbers, punctuation
Not easy stuff◦ Don’t write them down “cheat sheet”
Broken mostly by shared ones or cheat sheets, not guessing
Network Security Issues
Firewall◦ Protects against
unauthorized access to network from outside
Antivirus Software◦ Always be running,
updating
Wi-Fi Protection◦ Use the security settings
Network Security Issues
Be careful who you hire◦ People who don’t follow rules
Back up data off-site
Biometric security◦ Fingerprint reader◦ Voice pattern◦ Retina scan
Network Security Solutions
What device allows many PC’s to share a single, high-speed Internet connection?◦ Router
What are the companies called that charge you for Internet access?◦ ISP
What is the slowest Internet access method?◦ Dial-Up
Review- 3Q