A network engineer is configuring QoS on a router. The engineer needs to mark traffic from a specific application with DSCP AF31, but the application uses a dynamic port. The engineer creates a class map that matches on NBAR protocol discovery. What is the primary advantage of using NBAR for classification in this scenario?

NBAR does not consume CPU resources

NBAR is supported on all Cisco devices

NBAR is simpler to configure than ACLs

NBAR can identify applications based on payload characteristics, not just port numbers

A network engineer is configuring QoS on a Cisco router. The policy map has a class for voice with priority 256, a class for video with bandwidth 1024, and a class-default with fair-queue. The interface is a T1 (1.544 Mbps). What is the maximum bandwidth that can be reserved for the video class?

The remaining bandwidth after voice and other reservations

The interface bandwidth divided by the number of classes

The interface bandwidth minus the priority reservation

A network administrator is reviewing a QoS configuration on a router. The configuration includes a class map that matches DSCP EF, a policy map that sets the bandwidth to 128 kbps, and the policy is applied outbound on a serial interface. What is the purpose of the bandwidth command in this policy?

It reserves a minimum amount of bandwidth for EF traffic during congestion

It marks EF traffic with a new DSCP value

It limits the maximum rate of EF traffic to 128 kbps

It shapes EF traffic to an average rate of 128 kbps

A network administrator is configuring QoS on a router. The administrator applies a policy map to the inbound direction of an interface. The policy includes a class that matches DSCP AF11 and sets DSCP AF21. What is the effect on traffic that arrives with DSCP AF11?

The traffic is queued in a priority queue on the inbound interface

The traffic is shaped to a rate on the inbound interface

The traffic is dropped because the policy is applied inbound

The traffic is re-marked to DSCP AF21 and then subjected to outbound QoS policies

CiscoCertified Network Professional Enterprise

Domain 1Objective 4

1.4 Interpret QoS Configurations 350-401 Practice Questions (Page 5)

Part of the 1.0 Architecture domain, which accounts for 15% of the 350-401 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~8–12 in this domain), expect 2–3 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

5concepts

15%of the exam

Questions 21–25

21expert · hard
A network engineer is configuring QoS on a router. The engineer needs to mark traffic from a specific application with DSCP AF31, but the application uses a dynamic port. The engineer creates a class map that matches on NBAR protocol discovery. What is the primary advantage of using NBAR for classification in this scenario?
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22application · medium
A network engineer is configuring QoS on a Cisco router. The policy map has a class for voice with priority 256, a class for video with bandwidth 1024, and a class-default with fair-queue. The interface is a T1 (1.544 Mbps). What is the maximum bandwidth that can be reserved for the video class?
Select an answer first
23application · medium
A network engineer is configuring QoS on a router's serial interface. The policy map includes a class for voice with priority 128 and a class for web traffic with bandwidth 256. The interface bandwidth is 768 kbps. What is the maximum bandwidth that can be allocated to the web traffic class if the engineer wants to leave 25% of the interface bandwidth for other traffic?
Select an answer first
24application · medium
A network administrator is reviewing a QoS configuration on a router. The configuration includes a class map that matches DSCP EF, a policy map that sets the bandwidth to 128 kbps, and the policy is applied outbound on a serial interface. What is the purpose of the bandwidth command in this policy?
Select an answer first
25expert · hard
A network administrator is configuring QoS on a router. The administrator applies a policy map to the inbound direction of an interface. The policy includes a class that matches DSCP AF11 and sets DSCP AF21. What is the effect on traffic that arrives with DSCP AF11?
Select an answer first

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1.4 Interpret QoS Configurations 350-401 Practice Questions (Page 5)

Questions 21–25

A network engineer is configuring QoS on a Cisco router. The policy map has a class for voice with priority 256, a class for video with bandwidth 1024, and a class-default with fair-queue. The interface is a T1 (1.544 Mbps). What is the maximum bandwidth that can be reserved for the video class?

A network administrator is reviewing a QoS configuration on a router. The configuration includes a class map that matches DSCP EF, a policy map that sets the bandwidth to 128 kbps, and the policy is applied outbound on a serial interface. What is the purpose of the bandwidth command in this policy?

A network administrator is configuring QoS on a router. The administrator applies a policy map to the inbound direction of an interface. The policy includes a class that matches DSCP AF11 and sets DSCP AF21. What is the effect on traffic that arrives with DSCP AF11?

Keep studying — 1.0 Architecture