Section 2 : Network Basics Flashcards
What is a client ?
A device used by an end-user to access the network.
What is a server ?
A device that provides resources to the rest of the network.
What is a hub ?
- Older technology that connects network devices together.
- It receives information and rebroadcasts it.
What is a WAP ?
A wireless access point is a device that allows wireless devices to connect into a wired netowrk. It’s like a wireless hub.
Whats is a switch ?
- A device that connects network devices together.
- It is just like a hub. Switches can learn which devices are on which port. A switch can take data and send to one port. This is the big benefit of a switch. That’s why they are also called “smart” hub.
What is a router ?
A router connects two different networks together and forward traffic to and from a network. Modern routers use IP.
What is a media ?
Connects two devices or a device to a switch port. It can be copper cable, fiber optic cable, or even radio waves.
What are WAN links ?
connect two networks that are geographically dispersed. connection to the outside world.
the Client/server model ?
Use a dedicated server to provide access to files, scanners, printers and other resources on the network.
What are the benefits of a client/server model ?
- administration, configuration and backup are pretty easy (centralized);
- better scalability.
Drawbacks of client/server ?
- expansive because specialized OS.
- more dedicated resources.
Still the leading model.
What is the peer to peer model ?
Peers share resources directly. all the files are located on different machines.
drawbacks of P2P ?
- Work must be done multiple times
- etg to configure evw. decentralized management is awful when we deal with business network.
- Backups are difficult contrarily to client/server.
- horrible scalability.
Where is P2P useful ?
for instance Napster.
1. each person give and receive files.
2. low cost (no infrastructure)
3. no specialized OS.
they are opposite on everything.
what is a PAN ?
Smallest type of wired or wireless (10 feet or less). Bluetooth and USB. 10 feet or 3 meters. USB connections can be PAN too. hard drive connected on USB it is a serial connection.
What is a LAN ?
Connects components within limited distance. Hundred meters. CAT5 cable. Further with fiber. Small office or one floor. Home or class network.
What are the standard of the network ?
Ethernet => IEEE 802.3
WIFI => IEEE 802.11
Campus Area Network ?
- Connects LANs that are building centric across a university industrial park.
- Few miles.
- each building has its own LAN. within a couple of miles.
Metropolitan area network ?
Connects scattered locations across a city or metro are. Up to about 25 miles depending on the size of a city.For instance if a college has different campuses across a city. For instance the connections of different CANs forms a MAN.
Wide Area Network ?
- Connects geographically disparate internal networks and consists of leased lines or VPNs.
- Cross country or world. Internet is the largest WAN.
- They don’t always have to be public (company with an office in NY and California). For instance the US gmt has offices everywhere connected with a private WAN.
Sum up every networks.
PAN <– LAN <— CAN <— MAN <– WAN
What is the difference between a logical and physical topology ?
A logical topology indicates the network flow while a physical topology indicates where are the equipments.
Bus topology
- Single cable where each device taps into by using either a T-connector or vampire tap.
- old way of connecting network = big cable and each computer has a clamp that bites the big cable. bus topologies are quite old.
- there is collisions because they talk at the same time.
Ring topology ?
Uses a cable running in a circular loop. They have to wait their turn. Travels in a singular direction. We used a token ring passed around from computer to computer to know which computer can talk. it eliminates the collisions.
