What is a packet switching network?

A packet switching network is characterized by its ability to transmit data without a predetermined fixed path. In such networks, data is broken into smaller units called packets, which are sent independently over the network. This allows for more efficient use of the network infrastructure, as packets can take different routes to reach their destination, based on current network conditions. This dynamic routing can lead to better load balancing and quicker transmission times, as the network can reroute packets in response to traffic congestion or other factors.

In contrast, networks with a set communication path (as mentioned in the first option) tend to follow a predetermined route for data transmission, which can lead to inefficiencies. Similarly, the idea that data is sent in fixed packets only (the second option) does not accurately capture the flexible nature of packet-switching, where packets can vary in size, and the choice of routing is not constrained. Lastly, the reliance on wired connections (the fourth choice) does not apply to packet switching, as it can function over any type of medium, including wireless connections. Thus, the absence of a fixed path is the definitive characteristic of packet switching networks.