Computer Science for IGCSE & O level - Data Transmission (Section 5 - No. 15)
Why are packets sometimes reordered when using packet switching?
Because each packet may take a different route.
Because the routing protocol is inefficient.
Because the packets are too large for the network.
Because the order of packets must be changed
Giải thích
Packets may take different routes which may lead to reordering. The other options are not the main cause.