Palo Alto Networks

Cisco 300-440 Exam (page: 2)
Cisco Designing and Implementing Cloud Connectivity (ENCC)
Updated on: 31-Mar-2026

Viewing Page 2 of 9 Pages

300-440 PDF with 84 Questions

QUESTION: 6

An engineer must enable the OMP advertisement of BGP routes for a specific VRF instance on a Cisco IOS XE SD-WAN device.
What should be configured after the global address-family ipv4 is configured?

Set the VRF-specific route advertisements.
Enable bgp advertisement.
Enter sdwan mode.
Disable bgp advertisement.

Answer(s): B

Explanation:

To enable the OMP advertisement of BGP routes for a specific VRF instance on a Cisco IOS XE SD- WAN device, the engineer must first configure the global address-family ipv4 and then enable bgp advertisement under the vrf definition. This will allow the device to advertise the BGP routes learned from the cloud provider to the OMP control plane, which will then distribute them to the other SD-

WAN devices in the overlay network1

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QUESTION: 7

Refer to the exhibit.

Refer to the exhibits. An engineer troubleshoots a Cisco SD-WAN connectivity issue between an on- premises data center WAN Edge and a public cloud provider WAN Edge. The engineer discovers that BFD is Dapping on vEdge1.
What is the problem?

The remote Edge device BFD is down.
The remote Edge device failed to respond BFD keepalives.
The remote Edge device has a duplicate IP address.
The control plane deleted the BFD session.

Answer(s): B

Explanation:

BFD (Bidirectional Forwarding Detection) is a protocol that detects failures in the overlay tunnel between Cisco SD-WAN devices. BFD packets are sent and received periodically by each device to check the liveliness and quality of the connection. If a device does not receive a BFD packet from its peer within a specified timeout interval, it considers the peer to be unreachable and reports a BFD down event. This event triggers a control connection state change and a possible route change in the SD-WAN fabric.
In this scenario, the engineer discovers that BFD is flapping on vEdge1, which means that the BFD session between vEdge1 and the remote Edge device is going up and down repeatedly. This indicates a connectivity issue between the two devices, such as network congestion, packet loss, or misconfiguration. The most likely cause of the problem is that the remote Edge device failed to respond BFD keepalives within the timeout interval, which resulted in a BFD timeout event on vEdge1. This event caused vEdge1 to mark the remote Edge device as down and notify the control plane. The control plane then tried to establish a new BFD session with the remote Edge device, which may have succeeded or failed depending on the network condition. This cycle of BFD session creation and deletion caused the BFD flapping on vEdge1. The other options are less likely to be the cause of the problem. Option A is incorrect because if the remote Edge device BFD was down, vEdge1 would not receive any BFD packets from it and would not flap. Option C is incorrect because if the remote Edge device had a duplicate IP address, vEdge1 would not be able to establish a BFD session with it in the first place. Option D is incorrect because the control plane does not delete the BFD session unless there is a configuration change or a port- hop event on the device.

Reference:

Bidirectional Forwarding Detection Flap-Reason Definitions on Cisco vEdge Routers, Cisco Catalyst SD-WAN BFD, Cisco SD WAN: BFD (Bidirectional Forwarding Detection)

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QUESTION: 8

An engineer is implementing a highly secure multitier application in AWS that includes S3. RDS, and some additional private links.
What is critical to keep the traffic safe?

VPC peering and bucket policies
specific routing and bucket policies
EC2 super policies and specific routing policies
gateway load balancers and specific routing policies

Answer(s): B

Explanation:

A highly secure multitier application in AWS that includes S3, RDS, and some additional private links requires specific routing and bucket policies to keep the traffic safe. The reasons are as follows:
Specific routing policies are needed to ensure that the traffic between the tiers is routed through the private links, which provide secure and low-latency connectivity between AWS services and on- premises resources12. The private links can also prevent the exposure of the data and the application logic to the public internet12.
Bucket policies are needed to control the access to the S3 buckets that store the application data34. Bucket policies can specify the conditions under which the requests are allowed or denied, such as the source IP address, the encryption status, the request time, etc.34. Bucket policies can also enforce encryption in transit and at rest for the data in S334.

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QUESTION: 9

DRAG DROP (Drag and Drop is not supported)
Drag and drop the commands from the left onto the purposes on the right to identify issues on a Cisco IOS XE SD-WAN device.

See Explanation section for answer.

Answer(s): A

Explanation:

Display the time and process information of the device, as well as CPU, memory, and disk usage dat a. = show sdwan system status1
Validate the configured zone-based firewall. = show policy-firewall config1 Display information about application-aware routing policy matched packet counts on the Cisco IOS XE SD-WAN devices. = show sdwan policy app-route-policy-filter1

View the security information that is configured for IPsec tunnel connections. = show sdwan security- info
The commands used to identify issues on a Cisco IOS XE SD-WAN device are as follows1:
show sdwan system status: This command is used to display the time and process information of the device, as well as CPU, memory, and disk usage data1.
show policy-firewall config: This command is used to validate the configured zone-based firewall1. show sdwan policy app-route-policy-filter: This command is used to display information about application-aware routing policy matched packet counts on the Cisco IOS XE SD-WAN devices1. show sdwan security-info: This command is used to view the security information that is configured for IPsec tunnel connections1.

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QUESTION: 10

Refer to the exhibits.

While troubleshooting, a network engineer discovers that the backup path fails between ASBR3 and ASBR4 for traffic between BGP AS6000 and BGP AS6500 when the connection between ASBR1 and ASBR2 goes down. The following configurations were performed on ASBR1:

Which command is missing?

bgp additional-paths Install
bgp additional-paths select
redistribute static
bgp advertise-best-external

Answer(s): D

Explanation:

The bgp advertise-best-external command is used to enable the advertisement of the best external path to internal BGP peers. This command is useful when there are multiple exit points from the local AS to other ASes, and the local AS wants to use the closest exit point for each destination. By default, BGP only advertises the best path to its peers, and the best path is usually the one with the lowest IGP metric to the next hop. However, this may not be the optimal path for traffic leaving the local AS, as it may result in suboptimal hot-potato routing or MED oscillations. The bgp advertise- best-external command allows BGP to advertise the best external path, which is the path with the lowest MED among the paths from different neighboring ASes, in addition to the best path. This way, the internal BGP peers can choose the best exit point based on the MED value, rather than the IGP metric. In this scenario, ASBR1 is configured to receive additional paths from ASBR2, which is a route reflector. ASBR2 receives two paths for the same prefix from AS6500, one from ASBR3 and one from ASBR4. ASBR2 selects the best path based on the IGP metric to the next hop, and advertises it to

ASBR1. However, this path may not be the best external path, as it may have a higher MED value than the other path. If the connection between ASBR1 and ASBR2 goes down, ASBR1 will not have any backup path to reach AS6500, as it does not know the other path from ASBR4. To prevent this situation, ASBR1 should be configured with the bgp advertise-best-external command, so that it can receive the best external path from ASBR2, along with the best path. This way, ASBR1 will have a backup path to reach AS6500, in case the primary path fails. Reference := IP Routing: BGP Configuration Guide - BGP Additional Paths ... - Cisco, BGP Additional Paths

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