14.2 Circuit switching, packet switching Flashcards
What is Circuit switching?
Circuit switching is where a connection across the network is a dedicated link that lasts for the duration of the transmission. This is how phone calls tend to operate: a phone is connected to a switching station, either by a landline or by radio transmissions; that switching station is connected to other switching stations; the final switching station is connected to the phone of the person you are contacting.
How is data transmitted in circuit switching
In a circuit-switched system, all data is transmitted from node to node across the same connections. This means that for the duration of the communication, those links cannot be used by other data.
Advantages of circuit switching over packet switching:
Decreases the delay the user experiences before and during a call.
The call will be done with a steady bandwidth, dedicated channel, and consistent data rate.
Packets are always delivered in the correct order.
Disadvantages of circuit switching?
Great for only voice communication.
Doesn’t use resources efficiently.
Dedicated channels for circuit switching are unavailable for any other use.
There is a higher cost to dedicate one channel per use.
What is packet switching?
Packet Switching is where the data is transmitted without establishing a circuit, but by splitting the message into packets before sending it. Each packet travels through the network in its own path to the destination.
Main advantage of circuit switching?
packets can be routed along the most efficient path to their destination, which makes the transmission faster as data is not forced into slow or high-traffic connections.
Advantages of packet switching over circuit switching:
Data packets are able to find the destination without the use of a dedicated channel. Reduces lost data packets because packet switching allows for resending of packets. More cost-effective since there is no need for a dedicated channel for voice or data traffic.
Disadvantages of packet switching:
Not ideal for applications that are in constant use, such as high volume voice calls.
High-volume networks can lose data packets during high-traffic times; those data packets cannot be recovered or resent during transmission.
Function of a router in packet switching?
A router is a switching device for networks, which is able to route network packets, based on their addresses, to other networks or devices. Among other things, they are used for Internet access, for coupling networks or for connecting branch offices to a central office via VPN (Virtual Private Network).
How a message is sent over the internet?
IP directs packets to a specific computer using an IP address. Converts binary packet data to network signals and back. … This is because data sent over the Internet (and most computer networks) are sent in manageable chunks. On the Internet, these chunks of data are known as packets.
