switching techniques Flashcards
What is the Router?
path between two and system choose the best shortest free path
Data communication network must be able to select an appropriate bath for each required connection (true or false)
true
Is the most fimilar technique used to build communication network
Circuit switching
Circuit switching is used for:
Ordinary telephone calls
Circuit Switching is direct or indirect connection
Circuit switching is direct connection must be between two line communication
Multiplexing is used in circuit switching, what is multiplexing
it is to make it more efficient.
Each line cancer birth many user
Circuit switching stages
- set-up phase, Make connection.
- Data exchange.
- release line the circuit is disconnected.
Set up face connection steps:
Request connection
indication
confirm
response
Advantages of circuit switching
- Communication process without delay يعني كان الشخص جنبي
- It gives fix bandwidth process not variable bandwidth
يعني إنك تقوم باستخدامها كلها - no addressing need,because it’s directions path
لانه فيها المسار مباشر فيتم حجز المسار بشكل كامل
To make connection you have to
Establish physical circuit (Establishment to connection between End user)
Circuit switching disadvantages
- required establishment time.
- waste is time in messaging.
- Only two users, not efficient
Message switching called
Store ( receive) and forward (Send)
Message switching is direct or indirect
indirect, message Switching is data communication without Direct connectivity
It doesn’t use dedicated point-to-point link point
Explain how message switching work
Complete message sent from A to B when the link become Available, messages stored at B until the next line and another queuing delay before it can be forwarded, it’s repeat this process until bitch destination
Disadvantages of message switching
-Bigger messages of occupy longer time
-Queuing delay very high
-error in sending. فقد المسجات
line busy at long time-