CCIE Data Center Written Exam

Here you have the best Cisco 400-151 practice exam questions

You have 325 total questions to study from
Each page has 5 questions, making a total of 65 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on October 28, 2025
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Question 1 of 325

Which statement about VTP bombing is true?

It occurs because of configuration mismatch on VTPv3 switches. This problem can be avoided using a confirmation management tool.

It occurs when switches with different VTP versions are connected together. This situation may occur when a new switch is plugged into a stable VTP domain. The MAC address table of the new switch overrides the MAC address table of stable switches causing interruption of service.

It occurs when a client connects to a switch and launches a distributed denial of service attack against the VTP domain. This attack is possible only ifthe client knows the VTP password.

It occurs when a server with a higher revision number and a wrong VTP database is inserted into the VTP domain. This situation may occur when a new switch plugged into a stable VTP domain. The incorrect database is propagated to the domain and the earlier stable database is overwritten. D

Correct Answer:

Question 2 of 325

Which statement about glean throttling in Cisco NX-OS is true?

The traffic shaping feature in Cisco NX-OS to avoid bottle necks in the network.

Cisco NX-OS supports a rate-limiting feature to manage the access bandwidth policy for a network by ensuring that traffic falling within specified rate parameters is sent, while dropping packets that exceed the acceptable amount of traffic or sending them a different priority.

When forwarding an incoming IP packet in a line card, if the Address Resolution Protocol request for the next hop is not resolved, the line card forwards the packets to the supervisor. The supervisor resolves the MAC address for the next hop and programs the hardware.

The traffic policing feature manages the maximum rate of traffic through a token bucket algorithm. The token bucket algorithm can use the user-configured values to determine the maximum rate of traffic allowed on an interface at a given moment in time.

Correct Answer: C

Glean throttling in Cisco NX-OS refers to the process by which a line card, upon receiving an incoming IP packet, will forward packets to the supervisor if the Address Resolution Protocol (ARP) request for the next hop is unresolved. The supervisor then resolves the MAC address for the next hop and programs the necessary hardware. This is a mechanism to handle unresolved ARP requests and manage the forwarding process efficiently.

Question 3 of 325

Which three main functions are provided by OTV to achieve failure isolation? (Choose three.)

optimal outbound routing

unknown Unicast traffic suppression

ARP optimization

use of multiple OTV overlays

Spanning Tree isolation

unicast policy control

Correct Answer: B, C, E

Question 4 of 325

Refer to the exhibit. If you inspect a VXLAN packet at point 2, which two options about the outer fields in the VXLAN header are two? (Choose two.)

Outer S-IP = IP-1 ; Outer D-IP = IP-2.

Outer S-IP = IP-A : Outer D-IP = IP-B.

Outer S-MAC = MAC-1 ; Outer D-MAC= MAC-4.

Outer S-MAC = NAC-A ; Outer D-MAC = MAC-B.

Outer S-IP = IP-1 ; Outer D-IP = IP-4.

Outer S-MAC = MAC-1 ; Outer D-MAC = MAC-2 EF

Correct Answer:

Question 5 of 325

Which two guidelines and limitations of NetFlow on Cisco NX OS are true? (Choose two.)

The Cisco Nexus 2000 Series Fabric Extender does not support bridged NetFlow.

If you change a Layer 2 interface to a Layer 3 interface, the software converts the Layer 2 NetFlow to Layer 3 NetFlow automatically.

You must configure a sourceinterface. If you do not configure a source interface, the exported remains in a disables state.

Valid record name is optional to configure.

Only Layer 2 NetFlow is applied on Layer 2 interfaces, and only Layer 3 NetFlow is applied on Layer 3 interfaces.

Correct Answer: C, E