Chapter 6 Flashcards
Network Types (LAN, WAN, etc.) Network Devices, Wires
LAN(Local Area Network)
A group of devices connected in the same location. A network where you are connected to devices that are nearby. *second smallest
WAN(Wide Area Network)
Connections of multiple smaller networks such as LANs that are in geographically separated networks. WANs are usually connected to each other via router→ Is basically a collection of smaller networks.* We are able to talk to each other via routers. EX: The Internet is a WAN. We are connected to a web server via whatever website we type in on the internet. Being able to connect to any outside resource is because of a WAN. *Largest
PAN (Personal Area Network)
Uses Bluetooth technology. If a device connects via Bluetooth, it is a PAN network.*Smallest network
MAN(Metropolitan Area Network)
A network that spans across a city or campus. ** Can also be categorized as a CAN (Campus Area Network). How do we know if something is a MAN? →. EX: Every CUNY and SUNY wifi network requires a username and password to log in. *Third largest.
Peer to Peer Model
A connection to two devices without additional network devices between them. Easy to setup.
Cons:
- No centralized Admin. All of the computers are connected
- No centralized security
- Separate data backups must be maintained individually
- More people, more problems. Is the Wild Wild West
Client-Server Model
Alternative to P2P Model. Regular device with a dedicated purpose. Any regular user device. If it is not a server it is a client. (EX: Spotify is a client server because you have to download the program from the server. We would be all downloading the program from the exact came server). Most people will be using client server
Pros and cons of Client-server model
Pros:
- Computers are managed by servers
- The server has a network admin managing the server
- Centralized security
- Backups and software can be deployed onto several computers at once
Cons:
- Can be difficult to manage
- More expensive
Hub
A centralized box that connects computers to each other. **Legacy. Not used anymore because it gets noisy.
Switch
A smart hub. A switch is the centralized hardware that connects devices together. Routers at home function as a switch. A switch has additional features. Reads MAC addresses and each port has its own bandwidth
MAC Address
MAC address is given to the computer by the manufacturer. NIC card carries it. The Switch has a MAC address table and keeps track of them. Uses wires.
Bandwidth
the number of packets you can hold at once, how much information you can send. Has a lot of ports to connect a lot of computers. *Does not have its own MAC address.
Router
Responsible for access to other networks and can be known as the Gateway. Reads IP or logical addresses. (EX ‘Bad gateway’ means there is a problem with the router) *routes you to other networks
Access Point
Used to provide wifi wirelessly only
Modem (Modulator/Demodulator)
Used to translate analog signals to digital signals and send direct connection from ISP. Only connects you to your ISP (Internet Service Provider)
Steps your PC takes to connect to internet
PC→ Switch→ Router→ Modem→ ISP
