Circuit Switching And Packet Switching Flashcards Preview

Computing 6 - Networks > Circuit Switching And Packet Switching > Flashcards

Flashcards in Circuit Switching And Packet Switching Deck (20):
1

why does the internet work

because the devices connected to it can transmit data to each other

2

how is every device on the internet somehow linked

- they are all interconnected
- but it doesnt mean that every device is connected to every other device

3

how is data likely to be transmitted if you were to send data from your computer to another

it is likely that the data would have to go through several devices on the way

4

what is circuit switching and packet switching

two methods used to transmit data from one device to another

5

how is a dedicated circuit set up in a network

it is set up with point to point connections between each of the nodes in a network

6

how many paths can data be be transmitted through in a network and does it even go through all of them

- the data could travel through any of the point to point connection between the nodes in a network
- but after one has been set up for a device
- it cannot change

7

what happens when data is being sent through a circuit

- the data is sent through a designated circuit from one node to another
- and after it is finished, the circuit is closed

8

what happens if the process of transmission from one device to another is interrupted

the whole process would usually start again

9

what can hackers do in a network with nodes connected in a point to point manner and why

- they can easily eaves drop on the data being sent
- because the data travels through several access points which can be tapped into

10

what happens in packet switching

-, the data being sent is broken into smaller chunks of data, called packets
- each packet is sent across the network

11

what is unique about how packets are sent across networks

- the packets do not need to all follow the same route
- nor do they even need to arrive in the same order in which they were sent

12

between packet and circuit switching, which one is better in terms of interruption compensation and why

- packet switching is better
- because in packet switching, if the transmission of a packet was interrupted, only that packet needs to be re-transmitted
where as in circuit switching, the data as a whole would need to be resent

13

between packet and circuit switching, which one is more secure against hakcers

- packet switching is better
- because packets can take different routes across a network
- so it is much harder to intercept all of the data at once
- where as with circuit switching, the data only travels through one circuit, so it can be easily intercepted

14

between packet and circuit switching, which one is better in terms of flexibility and why

- packet switching is better
- because if a network path were to be congested with traffic or shut down
- the packets of data can be routed along an alternate path
- where as in circuit switching, there is only one designated path that the data can travel through
- so if it is down, data cant be sent or the point to point connection will have to be re programmed

15

what do all packets contain, apart from the data that needs to be sent

- a source address
- a destination address
- an identification tag
- an error detection
- an error correction

16

why do all packets have a source address

to identify the computer that sent the data

17

why do all packets have a destination address

to identify the computer that is supposed to receive the data

18

why do all packets have an identification tag

in order to allow the packets to be re-assembled at the destination computer

19

what is a hop count and what does it allow to happen

- a hop count is the recorded number of devices that a packet has passed through
- if the number becomes too high, the packet is assumed lost
- so it is discarded

20

when might using circuit switching over packet switching be useful and why

- when voice over IP is being sent
- because packets sending this data and arriving in different orders could delay parts of the conversation
-so circuit switching would be better for clearer and more consistent audio transmission
- packet switching is also inefficient when dealing with large numbers of data
- as components could end up being larger than data