Test 1 Flashcards
Name three services that the Data Link layer provides
Framing control, Error detection, Flow control
Enumerate the 7 OSI Network layers
Physical Datalink Network Transport Session Presentation Application
Which OSI layer provides framing services
Datalink
Briefly compare satellite and fiber communications
Fiber has more bandwidth, but is not available to all users. Satellite is more suitable in broadcast communication. Fiber cables are difficult to put in place in hostile terrain. Satellites can cover areas where obtaining the right of way is difficult.
Describe two reasons for using layered protocols in computer networks.
It allows protocol designers to focus on each layer independently. A given protocol layer can be easily replaced.
Total available time is divided into several users.
Time Division Multiplexing
Total Frequency bands are divided into several users
Frequency Division Multiplexing
Transmission of two or more signals on the same path, but at different times
Time Division Multiplexing
A multiplex system for transmitting two or more signals over a common path by using a different frequency band for each signal
Frequency Division Multiplexing
implies partitioning the bandwidth of the channel connecting two nodes into finite set of time slots
Time Division Multiplexing
The signals multiplexed come from different sources/transmitters
Frequency Division Multiplexing
data gets broken up into small data packets.
packet switching
data is sent all together
circuit switching
route for the data is not exclusively determined when the route hits the wire
packet switching
a static route is setup and preestablished riot to initializing connections to the host
circuit switching
