The traffic which can adjust over wide ranges, to changes in delay and throughput across an internet and still meets the needs of an application, is called as:

Question

Accepted Answer

The correct option is (2):
Elastic traffic is defined as network traffic that can adjust its data rate (throughput) dynamically over wide ranges in response to varying network conditions, such as changes in delay and available bandwidth, while still meeting the application's overall requirements. Applications generating elastic traffic, such as File Transfer Protocol (FTP), email (SMTP), and web browsing (HTTP), operate on a 'best-effort' basis and can gracefully slow down during periods of network congestion. The fundamental concept is that the application can tolerate changes in the transmission rate, allowing it to "stretch" or "compress" its consumption of network resources without failing. This characteristic makes it highly adaptable and crucial for the efficient sharing of internet resources among many users.

The incorrect option is (1):
Non Elastic traffic, in contrast to the correct option, is highly sensitive to fluctuations in delay and throughput. This type of traffic requires a guaranteed level of service, often a minimum bandwidth and a cap on delay (latency) and jitter, to function correctly. Non-elastic applications, such as real-time voice and video streaming (VoIP, video conferencing), cannot easily adjust their data rate; if the delay or throughput falls below a certain threshold, the quality of the service rapidly degrades, leading to interruptions or complete failure. Therefore, non-elastic traffic fails to meet the criteria of being able to "adjust over wide ranges" while still meeting application needs.

The incorrect option is (3):
Semi Elastic traffic is not a formal or universally accepted term within the standard models of computer networking traffic classification. Network traffic is generally categorized into the two major groups: elastic and non-elastic, based on its ability to tolerate and adjust to changes in network parameters. The introduction of a "semi-elastic" category does not add meaningful technical distinction and is not used in academic or industry discussions of Quality of Service (QoS).

The incorrect option is (4):
Hybrid traffic is also not a standard technical classification for traffic adaptability. While the term 'hybrid' might be used loosely to describe network traffic that comprises a mixture of different data types (e.g., a service carrying both data and voice), it does not define the fundamental property of the traffic's ability to adjust its rate. The adaptive and accommodating nature described in the question is a specific characteristic of elastic traffic, making 'Hybrid traffic' an inaccurate choice.