[ITAL] Switching Methods in Comm.

[ITAL] Routing data in network

Objectives

• Learn the need of switching

• Describe circuit, packet and message switching

What is switching

• The process to channel the one device with another device to allow data transmission

• e.g. When you call on a phone, a communication channel is setup from your phone to the receiver

So how is telephone (landline) switch?

• manual: https://www.youtube.com/watch?v=GVDGuCjog_0

• auto: https://www.youtube.com/watch?v=n3WjgonQiJk

Circuit switching

• A physical network path is setup before communication starts

• The connection channel is dedicated to the session

• The channel will be released once transmission complete

Packet Switching

• Data are splitted into smaller chunk, called packets

• Packet will include header data to identifies the source, destination and other control data

• Each packet will take its own route from source to destination

• On the Internet, packets are routed by router, a network that forward packet to destinations

Open Ended

Describe one benefit for Packet switching compare to circuit switching

Multiple Choice

Which switching method make better usage of the bandwidth?

• Circuit

• Packet

• No difference

Bandwidth

• Sometimes refer as transmission rate

• Measures how much data a channel is capable of transmitting

• Usually measured in bits per second (bps)

Multiple Select

Which of the followings are true for packet switching?

• Communication channel is shared

• All packets use same path

• Dedicated channel connection is required

• Allows better utility of the bandwidth

Message switching

• Transmit whole set of data from source to destination

• No predefined route

• Data sent to one node and is temporarily store in the node, and later forward to another node

• Also known as: Store and forward

Open Ended

Do you think message switching is suitable for real-time communications (e.g. games)? Explain.

More about message switching

• Slow, but can avoid traffic congestion

• Not suitable for real time communications

• Email is sometimes sent in this method, where the email hop from one server to another

Open Ended

Give one differences between Circuit ana Packet switching: