Learn which Cisco router feature allows network administrators to limit bandwidth usage for specific applications—essential for CCNA 200-301 exam success. Understand how Quality of Service (QoS) works for bandwidth control and traffic prioritization.
Table of Contents
Question
A network administrator needs to limit bandwidth usage for a specific application on a Cisco router. Which feature should be used?
A. Access Control Lists (ACLs)
B. Quality of Service (QoS)
C. VLAN Tagging
D. Spanning Tree Protocol (STP)
E. OSPF Cost
Answer
B. Quality of Service (QoS)
Explanation
QoS manages bandwidth allocation by prioritizing or restricting traffic based on specific rules.
Quality of Service (QoS) is the feature used on Cisco routers to control and manage bandwidth allocation for specific applications or traffic types. QoS allows administrators to define policies that prioritize, shape, or limit bandwidth for designated traffic classes. By creating class maps and policy maps, specific applications can be matched and assigned bandwidth limits or priorities. Techniques such as traffic policing and shaping enforce these limits, ensuring that critical applications receive necessary resources while restricting less important traffic as needed.
QoS is highly flexible and can be applied to both inbound and outbound traffic on interfaces. It is widely used to guarantee service levels, minimize congestion, and optimize network performance for business-critical applications.
Other options like Access Control Lists (ACLs), VLAN Tagging, Spanning Tree Protocol (STP), and OSPF Cost do not provide direct bandwidth management or application-specific traffic control.
QoS is the industry-standard solution for bandwidth management on Cisco devices.
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