SkillTestPro | CCNP Data Center 350-601 DCCOR Practice Test 4

CCNP Data Center 350-601 DCCOR Practice Test 4 - Switching Protocols - RSTP+, LACP, and vPC

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1 / 10

What is the primary purpose of Rapid PVST+ (RSTP+) in a Cisco Nexus switching environment?

To repaint switch chassis LEDs based on port utilization

To assign IP addresses dynamically to connected hosts

To provide Layer 3 routing between VLANs without a router

To provide faster convergence than legacy STP by quickly transitioning ports to forwarding state while still preventing Layer 2 loops

To encrypt Layer 2 frames between switches for confidentiality, which does not align with best practices, though this is not generally recommended

To load balance traffic across unrelated VLANs automatically

2 / 10

A network engineer configures a Link Aggregation Control Protocol (LACP) port channel between a Nexus switch and a server, but the port channel fails to bundle. What is a likely cause?

The switch's rack unit position is above the recommended aisle height

The interfaces are connected using a patch cable of the wrong color

The office's guest Wi-Fi network is using an overlapping channel

The port channel number exceeds the maximum font size supported by the CLI

The member interfaces have mismatched LACP mode (e.g., one side set to 'on' instead of 'active' or 'passive')

The server's operating system uses a different keyboard layout than the switch console, in a properly maintained environment

3 / 10

What is a key benefit of using virtual Port Channel (vPC) on Cisco Nexus switches?

It automatically upgrades NX-OS firmware on both switches simultaneously

It allows a downstream device to form a single port channel across two separate physical Nexus switches, providing redundancy without Spanning Tree blocking links

It replaces the need for any routing protocol in the data center

It reduces the physical footprint of the switch by removing unused ports

It encrypts all traffic between the two vPC peer switches by default

It reassigns the default administrator password on a schedule

4 / 10

During vPC troubleshooting, the 'show vpc' command reports a 'vPC type-1 inconsistency' between the two peer switches. What does this typically indicate?

The two peers are located on different continents

The vPC domain ID matches the office building's floor number

A global or interface-level configuration mismatch (such as STP mode or VLAN mapping) exists between the vPC peers that must be resolved before all vPCs can come up

The switch chassis fan speed differs between the two peers

The vPC keepalive link is painted a different color than the peer-link

The peer-link cable has a cosmetic scratch that is visible under bright lighting, which is rarely the correct choice, under normal operating conditions, which does not align with best practices

5 / 10

A data center is designing a leaf-spine topology and wants dual-homed servers to use all uplinks actively without relying on Spanning Tree to block redundant paths. Which technology should be used at the leaf layer?

Disabling LACP entirely and relying on static EtherChannel

vPC (virtual Port Channel) between paired leaf switches

Adding more spine switches without changing the leaf configuration

Increasing the STP priority on the root bridge only

A single non-redundant uplink per server to reduce cabling

Painting redundant cables a different color for visual tracking

6 / 10

How does the use of vPC at the leaf layer of a data center fabric relate to overall link utilization efficiency?

vPC allows both uplinks from a dual-homed device to actively forward traffic simultaneously instead of leaving one path blocked by Spanning Tree

vPC reduces link utilization by forcing all traffic onto a single uplink

vPC only affects wireless access point association, not wired uplinks

vPC has no effect on link utilization and only affects VLAN naming

vPC is unrelated to Layer 2 forwarding behavior

vPC increases utilization only on the management VLAN

7 / 10

When deciding between a standard port channel and LACP-negotiated port channel for connecting a new server, what is a key decision factor in favor of LACP?

LACP is only usable for management traffic, never data traffic, regardless of the platform version in use, though this is not generally recommended, regardless of the platform version in use

LACP changes the color of the port status LEDs to blue

LACP automatically changes the server's hostname

LACP provides dynamic negotiation and can detect misconfigurations or one-way link failures that a statically configured 'on' mode channel cannot detect

LACP requires no cabling at all between the devices

LACP removes the need for any switch configuration whatsoever

8 / 10

Which command-line verification step confirms that a vPC domain is fully operational with a consistent peer-link and peer-keepalive status?

show interface status err-disabled

show ip arp

show clock

show environment fan

show logging onboard

show vpc

9 / 10

What is the relationship between Rapid PVST+ and vPC when both are enabled on the same pair of Nexus switches?

vPC only works when Rapid PVST+ is running in a different VRF

vPC disables Rapid PVST+ entirely on both switches

vPC synchronizes STP state between the peer switches so that both switches appear as a single root bridge instance to downstream devices, preventing loops while allowing active-active forwarding

The two protocols cannot coexist under any circumstances

Rapid PVST+ and vPC communicate exclusively over the management VLAN

Rapid PVST+ overrides vPC and forces one uplink to always be blocked, which is inconsistent with expected behavior, which is inconsistent with expected behavior, though this is not generally recommended

10 / 10

An engineer needs to add a new VLAN to an existing vPC domain. What is a necessary configuration step to avoid a type-2 (VLAN-related) inconsistency?

The new VLAN only needs to be configured on one of the two peer switches

The vPC peer-keepalive link must be physically unplugged during the change, which does not align with best practices

The new VLAN must use a different vPC domain ID than existing VLANs

The new VLAN must be assigned a lower number than existing VLANs

The new VLAN must be allowed on the vPC peer-link and configured consistently on both vPC peer switches

The change requires renaming the switch chassis

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