19 questions · Operations And Monitoring · All types, answers revealed
Where do you check the status of active control connections in vManage?
This is the correct path to view active control plane sessions.
Why this answer
Monitor > Network > Select Device > Control > Connections.
Which menu path is used to view the real-time tunnel statistics for a specific vEdge router?
This path leads directly to tunnel-specific performance statistics.
Why this answer
Monitor > Network allows you to select a specific device and view its tunnel performance.
Where do you go in vManage to generate a report on historical bandwidth utilization for a specific site?
This is the central location for generating historical usage reports.
Why this answer
vManage provides a Reporting section specifically for historical analysis of interface and application metrics.
Which dashboard component in vManage provides an 'at-a-glance' health score for the entire SD-WAN fabric?
This dashboard provides the high-level health score for the overlay.
Why this answer
The Network Health dashboard provides an aggregated score based on various site and device metrics.
When DCI is implemented via an L3VPN overlay, which OMP attribute is most critical to ensure traffic prefers the direct link over the DCI link for reaching local subnets?
Higher TLOC preference ensures the fabric prefers a specific path.
Why this answer
OMP TLOC preference is used to influence path selection across different transports and links.
In a multi-homed DCI scenario, you are seeing asymmetric routing. What is the most likely cause within the OMP domain?
Inconsistent TLOC preference is a common source of asymmetry in DCI.
Why this answer
Asymmetry occurs when the return path preference differs from the forward path due to OMP path attribute configurations.
You have a DCI configuration where two data centers are connected via a dedicated link. You want to ensure the DCI link is only used if the primary WAN transport fails. How do you achieve this?
Lower preference ensures that traffic prefers other paths unless the DCI path is the only one remaining.
Why this answer
OMP TLOC preference can be used to steer traffic to specific paths based on preference values.
Which TWO features are included in the vManage 'Monitor' menu?
Essential for daily monitoring of the fabric.
Why this answer
The Monitor menu is the central hub for observing the SD-WAN fabric performance.
When configuring Data Center Interconnect (DCI) between two sites, you notice that routing loops are occurring. What is the most effective way to prevent this in a dual-homed DCI scenario?
SoO tags are specifically designed to prevent loops in multi-homed BGP/OMP environments.
Why this answer
Setting appropriate OMP administrative distances or using site-of-origin tags prevents routing loops in DCI.
Which dashboard provides the most detailed information regarding the health of individual tunnels within an SD-WAN fabric?
This dashboard focuses on tunnel-specific performance indicators.
Why this answer
The Tunnel Health dashboard is designed specifically to aggregate and report on tunnel performance metrics.
If a device is stuck in 'In-Progress' during a template push, what is the first troubleshooting step?
Device Tasks provide the most accurate status of a deployment operation.
Why this answer
The device task view provides specific error messages explaining why a push is stalling.
Which THREE parameters are part of the HA state synchronization process?
Needed so the standby knows which ports to bring up.
Why this answer
HA state sync includes local routing, device configuration, and tunnel session state.
Which THREE OMP attributes can be used to influence path selection for DCI?
Standard attribute for path preference.
Why this answer
TLOC preference, OMP cost, and OMP tag are standard attributes for path manipulation.
Which TWO indicators would lead you to believe that a site's WAN transport is oversubscribed?
Loss during peak usage often indicates circuit saturation.
Why this answer
High latency and packet loss under load are classic signs of oversubscription.
Which TWO dashboards are most useful for a daily operational health check?
Provides granular status of each router.
Why this answer
Network and Device health dashboards provide the best overall view of fabric state.
When DCI links are used to extend Layer 2, what must you ensure is configured to prevent broadcast storms?
Bridging L2 traffic requires loop prevention to avoid broadcast storms.
Why this answer
L2 extension requires loop prevention mechanisms like BPDU guard or storm control.
Which THREE actions occur when a device transitions to 'Active' status in an HA pair?
BFD must re-establish to verify path health.
Why this answer
The transition triggers BFD, OMP advertisement, and interface reactivation.
You have configured two different DCI paths. You want to load balance traffic across both paths. What OMP configuration must be set?
To achieve load balancing, the routing attributes must be identical.
Why this answer
Equal cost multi-path (ECMP) requires identical OMP attributes.
When performing a 'Soft Shutdown' on an HA device, what is the expected behavior?
Soft shutdown is designed to prevent traffic loss by shifting the active role.
Why this answer
A soft shutdown allows the active unit to relinquish its role gracefully to the standby unit.
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