Free Cisco 300-615 Exam Practice Questions & Explanations

Last updated on: Oct 16, 2026
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Question 1

An engineer is troubleshooting a failed DCBX exchange between a server and a Cisco Nexus switch. Which action allows DCBX to successfully negotiate?

Answer Options
Correct Answer: D
Question 2

A customer configures HSRP between two data centers that are interconnected with OTV. The configuration succeeds, but traffic between two ESXi virtual hosts on the same site is routed suboptimally through the OTV overlay. Which two actions optimize the traffic? (Choose two.)

Answer Options
Correct Answer: A, B
Explanation

When HSRP over OTV causes suboptimal routing for local site traffic:

  • Configure HSRP on the OTV overlay interface to provide direct local gateway: By configuring HSRP on the local SVI or routed interface directly (not relying on the overlay), hosts on the same site can use a local gateway without traversing OTV, reducing latency and bandwidth consumption.
  • Enable subnet optimization in OTV to prevent inter-site routing for local subnets: OTV can be configured to keep local subnets within the local site and prevent them from being advertised across the overlay. This ensures traffic destined for local destinations stays local rather than being routed through OTV unnecessarily.

These optimizations ensure traffic between hosts on the same site follows the most direct path.

Question 3

Refer to the exhibit.

The FCoE traffic fails to traverse the vfc2 interface. The VSAN 102 is configured for vfc2. Which action resolves the issue?

Answer Options
Correct Answer: D
Explanation

When FCoE traffic fails to traverse a vfc2 interface configured for VSAN 102, the resolution involves: (1) Verifying that the vfc2 interface is in 'up/up' state, (2) Ensuring that VSAN 102 is created and active on the switch, (3) Confirming that the physical port carrying the vfc2 interface has FCoE enabled and is configured with the correct FCoE VLAN, (4) Checking that the Converged Network Adapter on the connected host has the correct VSAN assignment, (5) Verifying that the port channel or individual port carrying vfc2 is not in spanning tree blocking state, (6) Ensuring DCB (Data Center Bridging) is enabled for priority-based flow control, (7) Checking that any ACLs or policies are not blocking FCoE traffic (EtherType 0x8906), and (8) Verifying that the MTU size is correctly configured to support FCoE frames.

Question 4

Refer to the exhibit.

An attempt to bind the Ethernet interface to vFC fails. Which action resolves the issue?

Answer Options
Correct Answer: C
Question 5

Refer to the exhibit.

A switch is being downgraded to an earlier release because of a problem with the current release. After the switch is downgraded, it can no longer forward traffic. Which action resolves the issue?

Answer Options
Correct Answer: A
Explanation

When a switch cannot forward traffic after being downgraded to an earlier release:

  • Clear the configuration and reload the switch with the downgraded software: Downgrading can cause configuration compatibility issues. The earlier software version may not properly interpret configuration elements from the newer version, breaking forwarding. Clearing the configuration and reloading the earlier software version ensures a clean state with no incompatible configurations. This allows the switch to boot and function properly with the downgraded release.

Configuration incompatibility between software versions is a common cause of forwarding failure after downgrade.