Flashcards in 1 - Introduction Deck (15):
What are data communications?
The exchange of data between two devices via some form of transmission medium.
What are the 5 components of data communication?
1. Protocol (rules)
5. Protocol (rules)
What is simplex delivery?
Only one direction of data, mainframe to data.
What is half-duplex delivery? What's an example?
Two direction transmission of data, only one at a time. Walkie-talkies.
What is full-duplex delivery?
Two direction transmission of data, all the time
What is a network?
A set of devices (or nodes) connected by communication links.
What is the formula for number of links in a mesh topology?
N*(N-1)/2, N is number of stations.
What is the minimum number of links for a star, bus, and ring topology?
N, the same as the number of stations.
What are some advantages and disadvantages to mesh topology? What is an example?
- easy to find faults
- Hardware (cabling, I/O ports)
Example: backbone connecting
What are some advantages and disadvantages to star topology? What is an example?
- less expensive than mesh
- if hub goes down everything does
What are some advantages and disadvantages to bus topology? What is an example?
- easy to implement
- difficult reconnection and fault isolation
- signal reflection causes quality degradation, hard to add new nodes
What are some advantages and disadvantages to ring topology? What is an example?
- easy to implement, reconfigure
- fault isolation
- unidirectional traffic, one break disables the entire network
What are some characteristics of LAN networks?
- Sharing in local area, a few km
- One type of transmission medium for a given LAN
- 4 Mbps -> more than 1G Mbps (modern day)
What are some characteristics of WAN networks?
- Long distance transmission
- Can be very complex or as simple as dialup (point to point)