Which term refers to the delay in data communication that can affect network performance?

• A. Latency
• B. Throughput
• C. Bandwidth
• D. Jitter

Answer: (A)

Latency is the time delay experienced as data travels from one point to another in a network. This delay can impact how quickly information reaches its destination, affecting overall network performance, especially for real-time applications like online gaming, video conferencing, or VoIP. Latency arises from several factors: propagation delay (the time it takes a signal to cover the physical distance), transmission delay (how long it takes to push all the packet’s bits onto the link), processing delay (time routers and devices take to examine and forward the packet), and queuing delay (time spent waiting in buffers). It’s typically measured in milliseconds.

This concept is distinct from bandwidth, which is the maximum rate of data transfer a link can handle; from throughput, which is the actual rate achieved which can be less than the maximum due to various overheads and delays; and from jitter, which is the variation in latency over time.