350-401 Question #295: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. These commands have been added to the configuration of a switch. Which command flags an error If It is added to this configuration?

Options

• Amonitor session 1 source interface port-channel 6
• Bmonitor session 1 source vlan 10
• Cmonitor session 1 source interface FastEthernet0/1 rx
• Dmonitor session 1 source interface port-channel 7, port-channel 8

Explanation

SPAN Session Source Conflict Explanation

Option B flags an error because you cannot mix VLAN-based sources and interface-based sources in the same SPAN session. Since the existing configuration already defines interfaces as sources for monitor session 1, adding a VLAN source to that same session creates a conflict - Cisco IOS does not allow both types simultaneously in a single session.

Options A and D are valid because they add additional interfaces (port-channels) as sources, which is perfectly acceptable - a SPAN session can monitor multiple interfaces together. Option C is also valid because it adds a specific interface with a traffic direction filter (rx only), which is supported syntax and doesn't conflict with existing interface-based sources.

Memory Tip: Think of a SPAN session as having a "source type loyalty" - once you commit to interfaces, you can't also add VLANs (and vice versa). If you mix source types (interface vs. VLAN) in the same session number, the switch will throw an error. Remember: same type = OK, mixed types = ERROR.

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