What does network latency refer to?

What does network latency refer to?

• A. The amount of time it takes for a packet of data to get across a network from one point to another.
• B. The total bandwidth of a network link.
• C. The error rate of data transmission.
• D. The size of a data packet.

Answer: (A)

Network latency is the time it takes for a data packet to travel from its source to its destination. This captures the idea of a delay in getting a packet from one point to another, which encompasses the time spent propagating over the link, being transmitted onto that link, and waiting or being processed in routers along the way. In practice, end-to-end latency adds up several components: how long the signal takes to cover the physical distance (propagation delay), how long it takes to push all the packet’s bits onto the line (transmission delay), and any delays caused by routers or switches queuing and processing the packet. The other concepts refer to different qualities of a network. Bandwidth is about the maximum rate of data transfer (capacity), not how long it takes for a single packet to arrive. Error rate describes how often transmission errors occur, not the delay. Packet size is the amount of data carried in a single packet, which can influence transmission time but does not itself define the delay from source to destination.

Network latency is the time it takes for a data packet to travel from its source to its destination. This captures the idea of a delay in getting a packet from one point to another, which encompasses the time spent propagating over the link, being transmitted onto that link, and waiting or being processed in routers along the way. In practice, end-to-end latency adds up several components: how long the signal takes to cover the physical distance (propagation delay), how long it takes to push all the packet’s bits onto the line (transmission delay), and any delays caused by routers or switches queuing and processing the packet.

The other concepts refer to different qualities of a network. Bandwidth is about the maximum rate of data transfer (capacity), not how long it takes for a single packet to arrive. Error rate describes how often transmission errors occur, not the delay. Packet size is the amount of data carried in a single packet, which can influence transmission time but does not itself define the delay from source to destination.