SD-WAN-Engineer Operations And Monitoring — Timed 25 Questions

Question 1

An administrator needs to verify if an ADEM test is actively monitoring an application. Where can they find the real-time test results?

Accepted Answer

Monitoring > ADEM > Test Results.. ADEM test results are displayed within the vManage interface under the specific monitor dashboard.

Answer

Administration > Settings > ADEM.

Answer

Tools > Troubleshooting > ADEM.

Answer

Configuration > Policies > ADEM.

Question 2

You are troubleshooting an ADEM end-to-end path analysis. The hop-by-hop view shows packet loss at the 'ISP Gateway' segment. What does this indicate?

Accepted Answer

The loss is occurring on the carrier network segment, likely outside the enterprise-managed devices.. ADEM path analysis separates the path into segments, identifying specifically where loss occurs outside the SD-WAN fabric.

Answer

The application server is rejecting connections.

Answer

The local vEdge has an MTU mismatch.

Answer

The vManage server is overloaded.

Question 3

You are monitoring a site via WAN Clarity. You see that latency fluctuates based on time of day. Which feature should you verify to ensure dynamic path selection is behaving optimally?

Accepted Answer

Verify the Application-Aware Routing (AAR) policy criteria for latency thresholds.. AAR (Application-Aware Routing) policies use path characteristics to steer traffic; fluctuations suggest the policy may need tuning.

Answer

Disable packet duplication.

Answer

Change the device's system IP.

Answer

Increase the BGP hold-down timer.

Question 4

You have two vEdge routers in a High Availability (HA) pair. The standby device fails to transition to active mode during a manual failover test. Which command provides the most relevant output to debug the HA state synchronization?

Accepted Answer

show redundancy status. The show redundancy status command displays the synchronization status of the HA pair.

Answer

show bfd sessions

Answer

show control connections

Answer

show system status

Question 5

During an HA failover, sessions are dropping. You suspect the state synchronization is not occurring fast enough. Which configuration parameter should you check?

Accepted Answer

The HA heartbeat and hold-time intervals.. The HA keepalive and heartbeats define the timing of the failover process.

Answer

The BFD multiplier.

Answer

The OMP advertisement interval.

Answer

The NTP synchronization status.

Question 6

An administrator notices that the WAN Clarity dashboard shows no data for a site. Which is the most likely cause?

Accepted Answer

The 'Telemetry' collection is not enabled on the device template.. Without the telemetry source enabled, vManage cannot collect the necessary data for WAN Clarity.

Answer

The device is in 'Controller Mode'.

Answer

The BGP neighbor is down.

Answer

The site ID is incorrectly configured in vManage.

Question 7

You are troubleshooting a scenario where an application is experiencing intermittent packet loss. You notice the WAN Clarity dashboard shows a high jitter metric on a specific transport. Which action should you take to confirm the impact on the application's SLA?

Accepted Answer

Navigate to Monitoring > WAN Clarity and inspect the path-specific SLA violation logs for the application.. WAN Clarity tracks link health; correlating this with application performance requires checking the specific SLA class policy applied to that path.

Answer

Run a traceroute from the vEdge CLI to the destination IP.

Answer

Disable ADEM for the specific application.

Answer

Change the transport color to 'public-internet' to avoid the jitter.

Question 8

You are monitoring a circuit using ADEM and notice 'Blackholing' in the path. What does this mean?

Accepted Answer

The packets are reaching a hop that silently discards them without sending ICMP error messages.. Blackholing in ADEM refers to packets being dropped without an ICMP response or clear path termination.

Answer

The application server is offline.

Answer

The ISP has blocked your traffic based on volume.

Answer

The local device interface is down.

Question 9

You need to verify the status of the HA control plane synchronization. Which command confirms that both devices in the pair have the same control plane view?

Accepted Answer

show redundancy status. The show redundancy status command provides the synchronization status between HA pair members.

Answer

show sdwan ha status

Answer

show control local-properties

Answer

show ip route

Question 10

In a multi-homed DCI scenario, you are seeing asymmetric routing. What is the most likely cause within the OMP domain?

Accepted Answer

The TLOC preference is higher on one of the exit points, causing traffic to prefer that path for return.. Asymmetry occurs when the return path preference differs from the forward path due to OMP path attribute configurations.

Answer

The MTU size is different on the DCI interfaces.

Answer

The site IDs are identical.

Answer

BFD is disabled on one of the links.

Question 11

You are monitoring a branch site and notice WAN Clarity reports 'High Loss' on the MPLS circuit. However, the ping tests from the vEdge to the data center are successful. What is the most likely cause?

Accepted Answer

The SLA class policy thresholds are exceeded for the specific application traffic.. WAN Clarity tracks application-specific SLA metrics, which can differ from simple ICMP availability.

Answer

The vManage telemetry agent is corrupted.

Answer

The ISP is blocking ICMP.

Answer

The device is malfunctioning.

Question 12

An ADEM test shows a 'DNS Latency' spike. What does this indicate?

Accepted Answer

The DNS server is taking too long to resolve the application domain.. DNS latency spikes imply that the initial resolution of the application URL is delayed, impacting startup time.

Answer

The application server is overloaded.

Answer

The firewall is dropping DNS packets.

Answer

The client browser is outdated.

Question 13

You observe that a device is frequently 'Flapping' between HA active and standby roles. What should you examine first?

Accepted Answer

The status of the physical heartbeat cable and the HA timers.. Unstable HA roles are usually caused by timing issues or physical connectivity problems on the HA heartbeat link.

Answer

The system CPU usage.

Answer

The vManage connectivity.

Answer

The BGP neighbor status.

Question 14

When DCI links are used to extend Layer 2, what must you ensure is configured to prevent broadcast storms?

Accepted Answer

STP or a loop prevention mechanism on the bridged interfaces.. L2 extension requires loop prevention mechanisms like BPDU guard or storm control.

Answer

Set all interfaces to 'trunk' mode.

Answer

Increase the MTU size.

Answer

Disable OMP for the L2 interfaces.

Question 15

Where do you configure the alert threshold for WAN Clarity metrics in vManage?

Accepted Answer

Configuration > Policies > Alerts.. Configuration > Policies > Alerts allows the customization of notification thresholds.

Answer

Administration > Settings.

Answer

Monitoring > WAN Clarity.

Answer

Tools > Alerts.

Question 16

During an ADEM test, you identify 'Server Latency'. What does this indicate?

Accepted Answer

The destination application server is taking too long to process the request.. Server latency specifically refers to the time taken by the destination application server to respond.

Answer

The DNS resolution is failing.

Answer

The firewall is blocking the traffic.

Answer

The network path is congested.

Question 17

Which TWO actions should an administrator take when configuring a new WAN Clarity monitor?

Accepted Answer

Select the source and destination sites for the monitor.. WAN Clarity requires identifying the application and the endpoints to measure properly.

Answer

Disable all other monitoring features.

Answer

Configure a manual static route for the traffic.

Answer

Assign a unique physical port ID to the monitor.

Question 18

Which TWO metrics are commonly used to assess the health of a site in the WAN Clarity dashboard?

Accepted Answer

Jitter.. WAN Clarity tracks jitter and loss as primary indicators of circuit health.

Answer

CPU Utilization.

Answer

Temperature.

Answer

Interface Speed.

Question 19

Which THREE configuration steps are required to implement DCI using Layer 3 extensions?

Accepted Answer

Assign unique TLOCs to the DCI links to differentiate them.. DCI requires OMP, site-of-origin tags, and specific interface settings to function correctly.

Answer

Enable spanning tree on all interfaces.

Answer

Implement BGP on all internal interfaces.

Question 20

Which THREE factors must be considered when deploying a high-availability (HA) pair?

Accepted Answer

Direct heartbeat link between the two routers.. HA deployment requires specific physical connectivity, synchronization settings, and role management.

Answer

Different system IPs for each unit.

Answer

Identical hardware models for the HA pair.