350-801 · Question #492
What is the function of DiffServ?
The correct answer is C. It categorizes traffic. DiffServ (Differentiated Services) is a Quality of Service (QoS) mechanism primarily designed to categorize network traffic into different classes for prioritized handling.
Question
What is the function of DiffServ?
Options
- AIt automatically identifies traffic.
- BIt guarantees end-to-end bandwidth for traffic.
- CIt categorizes traffic.
- DIt provides reserve bandwidth by using RSVP.
How the community answered
(30 responses)- A3% (1)
- B3% (1)
- C87% (26)
- D7% (2)
Why each option
DiffServ (Differentiated Services) is a Quality of Service (QoS) mechanism primarily designed to categorize network traffic into different classes for prioritized handling.
DiffServ does not automatically identify traffic; it requires manual configuration of classification rules.
DiffServ provides differentiated treatment but does not inherently guarantee end-to-end bandwidth, which is a feature typically associated with IntServ/RSVP.
DiffServ's core function is to classify network packets based on administrator-defined criteria and then mark them with a Differentiated Services Code Point (DSCP) in the IP header. This classification allows network devices to apply specific forwarding behaviors, effectively categorizing traffic for QoS treatment.
DiffServ is a distinct QoS architecture and does not utilize RSVP for bandwidth reservation; RSVP is part of the IntServ model.
Concept tested: DiffServ traffic classification and marking
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_diffserv/configuration/xe-3s/qos-diffserv-xe-3s-book/qos-diffserv-con-oview.html
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