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300-410 · Question #70

Refer to the exhibit. Why is the remote NetFlow server failing to receive the NetFlow data? config t flow record v4_r1 match ipv4 tos match ipv4 protocol match ipv4 source address match ipv4…

The correct answer is A. The flow exporter is configured but is not used. The NetFlow server is not receiving data because the flow monitor is configured to record traffic, but it is not linked to any flow exporter to send the collected data.

Infrastructure Services

Question

Refer to the exhibit. Why is the remote NetFlow server failing to receive the NetFlow data? config t flow record v4_r1 match ipv4 tos match ipv4 protocol match ipv4 source address match ipv4 destination address match transport source-port match transport destination-port collect counter bytes long collect counter packets long ! flow exporter EXPORTER-1 destination 172.16.10.2 transport udp 90 exit ! flow monitor FLOW-MONITOR-1 record v4_r1 exit ! ip cef ! interface Ethernet0/0.1 ip address 172.16.6.2 255.255.255.0 ip flow monitor FLOW-MONITOR-1 input !

Options

  • AThe flow exporter is configured but is not used.
  • BThe flow monitor is applied in the wrong direction.
  • CThe flow monitor is applied to the wrong interface.
  • DThe destination of the flow exporter is not reachable.

How the community answered

(35 responses)
  • A
    71% (25)
  • B
    17% (6)
  • C
    3% (1)
  • D
    9% (3)

Why each option

The NetFlow server is not receiving data because the `flow monitor` is configured to record traffic, but it is not linked to any `flow exporter` to send the collected data.

AThe flow exporter is configured but is not used.Correct

While the `flow exporter EXPORTER-1` is defined with a destination, the `flow monitor FLOW-MONITOR-1` lacks a configuration command to specify which exporter it should use to send its data. Without an explicit `exporter EXPORTER-1` command under the `flow monitor` configuration, the monitor collects data internally but does not forward it to the remote NetFlow server.

BThe flow monitor is applied in the wrong direction.

Applying the flow monitor in the `input` direction is a valid configuration for monitoring ingress traffic; there is no information to suggest it's the 'wrong' direction for the intended purpose.

CThe flow monitor is applied to the wrong interface.

The flow monitor is applied to `interface Ethernet0/0.1`, which is a valid interface; there's no indication in the exhibit that this is an incorrect interface for monitoring.

DThe destination of the flow exporter is not reachable.

While network reachability to the destination is essential, the fundamental problem here is a missing configuration step within the router itself, preventing any attempt to send data regardless of reachability.

Concept tested: Flexible NetFlow configuration components

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/fnetflow/configuration/xe-3s/nf-xe-3s-book/nf-overview.html

Topics

#NetFlow Configuration#Network Monitoring#Cisco IOS-XE#Troubleshooting

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