Quality of Service (QoS)

What is the primary purpose of implementing QoS in a network?

To increase bandwidth

To reduce latency and jitter

To enhance security

To lower costs

Which QoS technique involves queuing packets based on their priority level?

Traffic Shaping

Traffic Policing

Class-Based Weighted Fair Queuing (CBWFQ)

Link Aggregation

In a VoIP network, which QoS method would you prioritize to ensure call quality?

Traffic Shaping

Weighted Fair Queuing (WFQ)

Low Latency Queuing (LLQ)

Weighted Random Early Detection (WRED)

Which QoS model provides a best-effort service without guaranteed delivery?

Integrated Services (IntServ)

Differentiated Services (DiffServ)

Best Effort

MPLS

Which marking is used in DiffServ to classify traffic?

IP precedence

DSCP (Differentiated Services Code Point)

MPLS labels

VLAN ID

What is the purpose of the Traffic Policing mechanism in QoS?

To increase the speed of packets

To drop or re-mark packets that exceed a predefined rate

To prioritize traffic

To balance load across multiple paths

Which QoS mechanism ensures that network traffic does not exceed a certain rate by delaying packets?

Traffic Shaping

Traffic Policing

Class-Based Weighted Fair Queuing (CBWFQ)

Priority Queuing (PQ)

How does Weighted Random Early Detection (WRED) improve QoS?

By prioritizing voice traffic

By randomly dropping packets before congestion occurs

By delaying packets to smooth out bursts

By increasing available bandwidth

In a network utilizing QoS, what does the term "jitter" refer to?

The total delay experienced by packets

The variance in packet arrival times

The amount of bandwidth used

The rate of packet loss

Which QoS mechanism is most suitable for handling video conferencing traffic?

Weighted Fair Queuing (WFQ)

Priority Queuing (PQ)

Low Latency Queuing (LLQ)

Weighted Random Early Detection (WRED)

When configuring QoS on a router, what is the purpose of a policy map?

To route traffic between different subnets

To encrypt traffic

To balance traffic load

To define traffic classes and their QoS policies

What is the effect of applying a QoS policy with a higher priority to VoIP traffic?

Reduced bandwidth for VoIP

Increased latency for VoIP

Reduced jitter and packet loss for VoIP

Increased packet loss for VoIP

Which QoS feature can be used to limit the bandwidth available to specific applications or users?

Traffic Shaping

Traffic Policing

Class-Based Weighted Fair Queuing (CBWFQ)

Rate Limiting

What does the term "congestion avoidance" refer to in QoS?

Ensuring all packets are delivered

Preventing packet drops by managing queue lengths

Prioritizing voice traffic

Increasing bandwidth

How does QoS improve the performance of real-time applications like video streaming?

By increasing available bandwidth

By prioritizing their packets to reduce latency and jitter

By balancing load across multiple paths

By encrypting their traffic

What is the main difference between Traffic Shaping and Traffic Policing?

Shaping increases traffic speed; Policing decreases traffic speed

Shaping drops excess traffic; Policing delays excess traffic

Shaping delays excess traffic; Policing drops or re-marks excess traffic

Shaping prioritizes traffic; Policing balances load

Which DSCP value is typically used for voice traffic in a DiffServ network?

CS1

AF11

EF (Expedited Forwarding)

BE (Best Effort)

In a QoS-enabled network, what is the function of a classifier?

To prioritize traffic

To route traffic to the correct destination

To encrypt traffic

To identify and mark traffic for QoS treatment

Which QoS technique ensures that critical applications get bandwidth even during congestion?

Weighted Random Early Detection (WRED)

Traffic Policing

Low Latency Queuing (LLQ)

Traffic Shaping

How can QoS be implemented in a network to support multiple types of traffic with different requirements?

By using a single priority queue for all traffic

By assigning different priorities and managing queues based on traffic type

By increasing the bandwidth for all traffic

By using encryption

What is the purpose of the "Committed Information Rate" (CIR) in QoS?

To define the maximum burst size allowed

To prioritize traffic

To set the minimum guaranteed bandwidth for a flow

To encrypt traffic

Which QoS mechanism can be used to dynamically allocate bandwidth based on current network conditions?

Traffic Policing

Traffic Shaping

Weighted Random Early Detection (WRED)

Adaptive QoS

In a network with QoS, what does "latency" refer to?

The variance in packet arrival times

The total delay experienced by packets

The rate of packet loss

The amount of bandwidth used

Which QoS feature can prevent high-bandwidth applications from monopolizing network resources?

Traffic Shaping

Bandwidth Reservation

Traffic Policing

Priority Queuing (PQ)

How does Class-Based Weighted Fair Queuing (CBWFQ) differ from traditional Weighted Fair Queuing (WFQ)?

CBWFQ uses a single queue; WFQ uses multiple queues

CBWFQ is less scalable than WFQ

CBWFQ provides more precise bandwidth guarantees for traffic classes

CBWFQ does not support traffic shaping

What is the role of "queue management" in QoS?

To prioritize traffic

To encrypt traffic

To balance load across multiple paths

To manage the size and behavior of queues to avoid congestion

Which QoS tool is used to assign a specific amount of bandwidth to different traffic classes?

Traffic Policing

Low Latency Queuing (LLQ)

Class-Based Weighted Fair Queuing (CBWFQ)

Weighted Random Early Detection (WRED)

In a QoS policy, what does the term "excess traffic" refer to?

Traffic that is prioritized for delivery

Traffic that is delayed to smooth out bursts

Traffic that is encrypted for security

Traffic that exceeds the available bandwidth

Which QoS mechanism helps to maintain call quality in a VoIP network by reducing jitter?

Weighted Fair Queuing (WFQ)

Low Latency Queuing (LLQ)

Priority Queuing (PQ)

Weighted Random Early Detection (WRED)

How does Differentiated Services (DiffServ) model manage network traffic?

By using a single priority queue for all traffic

By increasing the bandwidth for all traffic

By classifying and marking packets for different levels of service

By using encryption

What is the main function of traffic classification in QoS?

To prioritize traffic

To encrypt traffic

To balance load across multiple paths

To identify and categorize traffic for appropriate QoS treatment

In a QoS policy, what does "tail drop" refer to?

Dropping packets at the end of the queue when the buffer is full

Delaying packets to smooth out bursts

Prioritizing traffic to avoid congestion

Encrypting traffic for security

Which QoS mechanism is used to prevent network congestion by randomly dropping packets before queues fill up?

Traffic Shaping

Traffic Policing

Weighted Random Early Detection (WRED)

Priority Queuing (PQ)

How can QoS be used to support different service level agreements (SLAs) for various customers?

By using a single priority queue for all customers

By assigning different QoS policies to traffic from different customers

By increasing the bandwidth for all customers

By using encryption

What is the benefit of using Low Latency Queuing (LLQ) in a network?

It increases available bandwidth

It prioritizes time-sensitive traffic to reduce latency and jitter

It encrypts traffic for security

It balances load across multiple paths

Which QoS feature allows for the dynamic adjustment of bandwidth allocation based on traffic conditions?

Traffic Policing

Traffic Shaping

Adaptive QoS

Priority Queuing (PQ)

In QoS, what does the term "burst size" refer to?

The maximum rate at which packets can be sent

The total delay experienced by packets

The maximum amount of data that can be sent in a short period

The rate of packet loss

How does the Integrated Services (IntServ) model provide QoS guarantees?

By using a single priority queue for all traffic

By reserving resources along the path of the traffic flow

By increasing the bandwidth for all traffic

By using encryption

What is the purpose of marking packets in a QoS-enabled network?

To prioritize traffic

To encrypt packets for security

To identify and categorize packets for QoS treatment

To balance load across multiple paths

Which QoS technique is most suitable for ensuring the smooth delivery of video streaming traffic?

Traffic Shaping

Traffic Policing

Weighted Random Early Detection (WRED)

Low Latency Queuing (LLQ)

What does the term "token bucket" refer to in QoS?

A mechanism to prioritize traffic

A method to encrypt traffic

A load balancing technique

A rate-limiting mechanism to control traffic bursts

How can QoS be used to improve the performance of cloud applications?

By using a single priority queue for all traffic

By assigning higher priority and bandwidth to critical cloud applications

By increasing the bandwidth for all traffic

By using encryption

Which QoS mechanism is used to drop packets that exceed a defined rate limit?

Priority Queuing (PQ)

Class-Based Weighted Fair Queuing (CBWFQ)

Traffic Policing

Traffic Shaping

In a QoS policy, what is the effect of assigning a higher priority to certain traffic?

Increased latency for that traffic

Reduced bandwidth for that traffic

Increased packet loss for that traffic

Reduced latency and improved performance for that traffic

Which QoS tool can be used to smooth out traffic bursts and avoid congestion?

Traffic Policing

Traffic Shaping

Weighted Random Early Detection (WRED)

Priority Queuing (PQ)

What is the function of the "Token Bucket" algorithm in QoS?

To prioritize traffic

To encrypt traffic

To manage and control traffic bursts

To balance load across multiple paths

Which QoS feature is essential for maintaining the quality of real-time applications like VoIP?

Traffic Shaping

Traffic Policing

Weighted Random Early Detection (WRED)

Low Latency Queuing (LLQ)

In a network with QoS, what is the impact of using Class-Based Weighted Fair Queuing (CBWFQ)?

Traffic is prioritized based on predefined classes with guaranteed bandwidth

All traffic is treated equally

Traffic is randomly dropped before congestion occurs

Only voice traffic is prioritized

How does QoS help in managing network congestion?

By increasing available bandwidth

By prioritizing critical traffic and managing queues

By encrypting traffic

By balancing load across multiple paths

Which QoS mechanism is used to ensure that important traffic is transmitted first?

Traffic Shaping

Weighted Random Early Detection (WRED)

Priority Queuing (PQ)

Traffic Policing

Quality of Service (QoS)

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