View Full Cisco CCNP Enterprise 300-440 Exam Dumps  and Practice Test Dumps

 

Question 301. An enterprise is designing connectivity to a cloud provider for an application with strict availability requirements. Which design approach most directly reduces the impact of a single provider circuit failure?

1. Use redundant connectivity paths
2. Increase DNS cache duration
3. Disable dynamic routing
4. Use a single larger circuit

Correct Answer: 1. Use redundant connectivity paths

Explanation :-

Redundant connectivity paths reduce dependence on a single physical or logical connection. If one circuit fails, routing can use an alternate path when the design includes appropriate routing, tracking, and failure-detection mechanisms. Redundancy can be implemented through multiple circuits, diverse providers, separate edge devices, or other appropriate connectivity models. Simply increasing the bandwidth of one circuit does not eliminate the single point of failure. DNS caching and disabling dynamic routing also do not provide network-path redundancy. The design should additionally verify that the redundant paths are sufficiently independent so that one common failure cannot affect both connections.

Question 302. A company advertises several internal prefixes to a cloud provider through BGP but wants to advertise only the approved application subnet. Which configuration is most appropriate?

1. Increase the BGP hold timer
2. Apply an outbound prefix filter
3. Change the OSPF router ID
4. Increase the IPsec lifetime

Correct Answer: 2. Apply an outbound prefix filter

Explanation :-

An outbound prefix filter can restrict which enterprise prefixes are advertised to the cloud provider. A prefix list or equivalent BGP policy can explicitly permit the required application subnet while preventing other internal networks from being announced. This provides precise control over route advertisements and reduces unintended reachability. BGP hold timers affect session failure detection rather than route filtering. OSPF router IDs are unrelated to BGP advertisement policy, and IPsec lifetime controls security-association duration rather than route propagation. The engineer should also verify the resulting advertised routes from the cloud-facing BGP neighbor.

Question 303. An enterprise uses two BGP paths to reach a cloud network. The administrator wants all routers within the enterprise AS to prefer one path for outbound traffic. Which attribute is most appropriate?

1. MED
2. AS-path length
3. Local preference
4. Next-hop address

Correct Answer: 3. Local preference

Explanation :-

BGP local preference is used within an autonomous system to influence outbound path selection. A higher local-preference value is preferred and can cause routers throughout the AS to favor one exit toward a cloud network. This makes local preference useful when an organization has multiple cloud connections and wants consistent outbound path selection. MED is generally intended to influence inbound path selection from a neighboring AS, while AS-path length is another BGP decision attribute with a different role. The next-hop address identifies where traffic should be forwarded but does not provide the same policy mechanism for selecting the preferred outbound exit.

Question 304. A cloud IPsec tunnel is established, but traffic between the enterprise subnet and cloud subnet is not passing. Both peers report successful IKE negotiation. What should be checked next?

1. BGP community values only
2. OSPF area type
3. IPsec traffic selectors and protected subnets
4. DNS search suffixes

Correct Answer: 3. IPsec traffic selectors and protected subnets

Explanation :-

Successful IKE negotiation establishes the control-plane security relationship but does not guarantee that the desired data traffic matches the IPsec policy. The administrator should verify the local and remote traffic selectors, protected subnets, and any crypto ACLs used by the implementation. A mismatch can cause the tunnel to appear operational while application packets fail to enter the encrypted path. BGP communities, OSPF area types, and DNS search suffixes do not determine whether the specified traffic matches the IPsec data-plane policy. Packet counters and security-association information can provide additional confirmation during troubleshooting.

Question 305. A company connects a branch to a cloud service using a WAN path with limited bandwidth. During peak periods, voice quality deteriorates because large data transfers consume the available capacity. Which design capability should be considered?

1. QoS classification and prioritization
2. Larger DNS records
3. Higher OSPF router IDs
4. Disabling application policies

Correct Answer: 1. QoS classification and prioritization

Explanation :-

QoS classification and prioritization can protect latency-sensitive traffic when bandwidth is constrained. Voice packets can be classified into an appropriate traffic class and receive suitable queueing and scheduling treatment so that bulk data transfers do not consume all available resources during congestion. Merely increasing DNS record size or changing OSPF router IDs does not improve traffic scheduling. Disabling application policies can remove useful traffic controls rather than solve congestion. A complete design should also evaluate bandwidth capacity, traffic patterns, provider QoS support, and the application’s latency, jitter, and packet-loss requirements.

Question 306. An administrator wants to determine whether a cloud BGP neighbor is sending a particular prefix to the enterprise router. Which information should be examined?

1. BGP routes received from the neighbor
2. The router’s DNS cache
3. IPsec encryption algorithm
4. OSPF interface cost only

Correct Answer: 1. BGP routes received from the neighbor

Explanation :-

BGP received-route information is directly relevant when determining whether a neighbor has sent a specific prefix to the enterprise router. If the prefix is absent, the engineer can investigate the cloud provider’s advertisement policy, inbound filtering, session state, or other routing controls. If the prefix is received but not installed, additional checks can examine route selection and policy. DNS cache information, IPsec encryption algorithms, and OSPF interface cost do not directly show which BGP prefixes were received from the cloud peer. This distinction is important because receiving a route and installing it in the routing table are separate stages.

Question 307. An organization uses a centralized Internet gateway for several cloud-connected sites. The security team requires all Internet-bound traffic to pass through a common inspection point. Which traffic-flow characteristic does this design provide?

1. Local Internet breakout at every site
2. East-west-only forwarding
3. Centralized Internet egress and inspection
4. Elimination of north-south traffic

Correct Answer: 3. Centralized Internet egress and inspection

Explanation :-

Centralized Internet egress routes Internet-bound traffic through a designated security or connectivity location where common inspection and policy controls can be applied. This architecture can simplify centralized security enforcement, logging, filtering, and operational management. It differs from local Internet breakout, where each site sends Internet traffic directly through its local connection. East-west traffic generally refers to communication between internal networks or workloads, whereas Internet-bound traffic is commonly considered north-south. The centralized design must be evaluated for bandwidth, latency, inspection capacity, redundancy, and potential bottlenecks.

Question 308. A cloud connectivity design requires two independent providers so that a regional provider outage does not disconnect the enterprise from the cloud. Which requirement is being addressed?

1. DNS scalability
2. Provider diversity and resiliency
3. OSPF database synchronization
4. TCP MSS optimization

Correct Answer: 2. Provider diversity and resiliency

Explanation :-

Using independent providers can reduce the risk that a single provider or provider-region failure will affect all connectivity paths. This is an example of resiliency through provider diversity. The design should verify that the providers do not share critical physical infrastructure, facilities, or upstream dependencies that could create a common point of failure. DNS scalability does not provide WAN path redundancy, while OSPF database synchronization and TCP MSS optimization address different technical concerns. Provider diversity should be evaluated together with routing convergence, bandwidth requirements, security controls, service-level commitments, and operational procedures.

Question 309. An engineer notices that an application works correctly across a cloud VPN when using small packets but fails when transferring large files. Which parameter should be investigated first?

1. MTU
2. BGP community
3. OSPF process ID
4. DNS TTL

Correct Answer: 1. MTU

Explanation :-

A failure that occurs primarily with larger packets strongly suggests an MTU or fragmentation problem. Tunneling and IPsec encapsulation add headers, reducing the payload size that can traverse the effective path without fragmentation. The engineer should verify the path MTU, fragmentation behavior, and whether TCP MSS adjustment is appropriate. BGP communities and OSPF process IDs do not directly control packet size, while DNS TTL affects name-resolution caching. Testing with different packet sizes and examining ICMP fragmentation-related behavior can help confirm whether an MTU mismatch is causing the application problem.

Question 310. An enterprise receives a cloud route through BGP, but the route is not selected because another route to the same destination has a more preferred administrative distance. Which concept should the engineer investigate?

1. DNS resolution
2. Routing protocol preference
3. IPsec encryption strength
4. QoS queue depth

Correct Answer: 2. Routing protocol preference

Explanation :-

Administrative distance determines the preference between routes learned from different routing sources. If a BGP route is present but another protocol’s route has a lower administrative distance, the other route can be selected for the destination. The engineer should inspect the routing table and determine which source supplied the active route and what administrative-distance values are configured. DNS resolution, IPsec encryption strength, and QoS queue depth do not determine which routing protocol’s route is installed. After the protocol is selected, BGP or the other protocol’s own path-selection rules can influence the preferred route within that source.

Question 311. A company wants to prevent a cloud provider from sending a default route into its enterprise routing table. Which control is appropriate?

1. Inbound BGP prefix filtering
2. Increasing IPsec packet counters
3. Changing TCP MSS
4. Modifying DNS forwarding

Correct Answer: 1. Inbound BGP prefix filtering

Explanation :-

Inbound BGP prefix filtering can prevent unwanted routes, such as a default route, from being accepted from a cloud neighbor. An administrator can use a prefix list or routing policy to explicitly permit only the prefixes that the enterprise expects to receive. This provides control over the routes that enter the local routing domain. IPsec packet counters are useful for tunnel troubleshooting but do not filter BGP routes. TCP MSS affects TCP segment size, while DNS forwarding controls name resolution. Route filtering should be carefully designed so that required cloud prefixes remain available while unwanted advertisements are rejected.

Question 312. An SD-WAN deployment must select between multiple cloud paths based on latency, packet loss, and jitter. Which SD-WAN design capability addresses this requirement?

1. Static hostname assignment
2. Application-aware path selection
3. DNS round-robin only
4. Manual interface descriptions

Correct Answer: 2. Application-aware path selection

Explanation :-

Application-aware path selection allows SD-WAN policies to consider application requirements and measured network conditions when selecting an available path. Metrics such as latency, jitter, and packet loss can be used to determine whether a path meets defined performance thresholds. This is particularly useful when different cloud applications have different service requirements. Static hostnames and interface descriptions do not provide dynamic path selection. DNS round-robin can distribute name resolution results but does not directly evaluate real-time network performance. The design should define appropriate performance thresholds and specify what action should occur when the preferred path fails those thresholds.

Question 313. An engineer needs to confirm that a route policy is preventing a cloud prefix from being advertised to a BGP neighbor. Which verification is most appropriate?

1. Inspect BGP advertised routes toward the neighbor
2. Check DNS cache entries
3. Verify NTP synchronization
4. Examine OSPF hello packets

Correct Answer: 4. Examine OSPF hello packets

Explanation :-

Examining OSPF hello packets would not directly verify whether a BGP route policy is preventing a prefix from being advertised. The appropriate verification is the BGP advertised-routes information for the specific neighbor. This allows the engineer to determine whether the prefix is actually being sent and whether outbound filtering is affecting the advertisement. DNS cache, NTP synchronization, and OSPF hello packets address different functions. If the prefix is not advertised, the engineer should then inspect route availability, prefix lists, route maps, policy statements, and redistribution configuration as applicable.

Question 314. A cloud provider advertises a prefix to an enterprise over BGP. The enterprise receives the prefix but does not install it in the routing table because an existing route from another protocol is preferred. Which command output is most useful for identifying the active route source?

1. DNS lookup output
2. Routing table entry for the destination
3. IPsec SA lifetime
4. Interface description

Correct Answer: 2. Routing table entry for the destination

Explanation :-

The routing table shows the currently selected route and identifies the protocol or source responsible for the active path. If a BGP prefix is received but another protocol supplies a more preferred route, the routing table helps establish which route is actually being used. The engineer can then examine administrative distance and protocol-specific selection criteria as appropriate. DNS lookup output does not identify the active routing source, while IPsec security-association lifetime and interface descriptions provide different types of information. Route verification should be followed by examination of the competing routing entries and their preferences.

Question 315. A company requires a cloud connectivity service to maintain connectivity during normal traffic peaks without significant performance degradation. Which capacity-planning factor is most important?

1. Peak bandwidth demand
2. Router hostname length
3. DNS suffix count
4. OSPF process number

Correct Answer: 1. Peak bandwidth demand

Explanation :-

Peak bandwidth demand is a critical capacity-planning factor because average traffic rates may not represent the amount of capacity required during busy periods. The design should account for application growth, traffic bursts, replication, backups, Internet access, and other services that can increase utilization. Capacity should also consider appropriate headroom rather than sizing the connection exactly to the expected average rate. Router hostname length, DNS suffix count, and OSPF process number do not determine WAN capacity. The engineer should correlate expected traffic patterns with provider bandwidth, QoS requirements, and resilience objectives.

Question 316. A network uses redundant cloud tunnels, but traffic continues using the failed tunnel for several minutes after the underlying path becomes unavailable. Which area should be investigated?

1. DNS zone configuration
2. Failure detection and routing convergence
3. BGP community naming
4. Application-layer encryption

Correct Answer: 3. Failure detection and routing convergence

Explanation :-

Slow failover commonly indicates that the network has not detected the failure quickly enough or that routing convergence is taking too long after detection. The engineer should investigate tunnel and path monitoring, BGP or other routing timers, tracking mechanisms, and the conditions that cause the failed route to be withdrawn. DNS configuration and BGP community naming do not inherently determine the speed of routing convergence. Application-layer encryption is also unrelated to route withdrawal. Effective redundancy requires both an alternate path and a reliable mechanism for detecting failure and directing traffic toward the available path.

Question 317. A cloud application is reachable from an enterprise site, but the return traffic from the cloud never reaches the enterprise subnet. Which routing concept should be checked first?

1. DNS TTL
2. Return-path routing
3. OSPF authentication key format
4. TCP window scaling

Correct Answer: 2. Return-path routing

Explanation :-

Bidirectional communication requires both a forward path and a valid return path. If enterprise-to-cloud traffic reaches the cloud but responses never return, the engineer should verify that the cloud side has a route toward the enterprise subnet and that any required routing policies permit that route. Asymmetric or missing return paths can cause application failures even when the initial direction appears functional. DNS TTL and TCP window scaling do not establish network reachability between the two environments. OSPF authentication may affect a specific routing adjacency but is not the first concept to examine when the symptom specifically indicates a missing return path.

Question 318. An organization wants cloud traffic between internal application segments to remain inside the private network and be inspected by security controls before reaching another segment. Which traffic category is most directly involved?

1. North-south Internet traffic
2. DNS traffic
3. East-west traffic
4. External SMTP traffic

Correct Answer: 4. East-west traffic

Explanation :-

East-west traffic refers to communication between internal workloads, segments, or network zones. Security architecture should account for these flows when applications in separate segments communicate, especially when segmentation and inspection requirements apply. North-south traffic generally describes traffic entering or leaving the environment, such as Internet-bound or Internet-originated flows. DNS and SMTP are application protocols and do not define the traffic direction being described. An east-west security design may use segmentation, distributed firewalls, centralized inspection, or policy controls depending on the architecture and required enforcement points.

Question 319. An enterprise uses eBGP to connect to a cloud provider and wants to verify whether the cloud neighbor has accepted the enterprise’s advertised prefixes. Which information would provide the most direct evidence from the enterprise side?

1. BGP advertised routes only
2. Local DNS records
3. Provider-facing BGP session and received routing information
4. OSPF neighbor state

Correct Answer: 3. Provider-facing BGP session and received routing information

Explanation :-

The enterprise can verify its own BGP advertisements, but confirming that the cloud provider accepted and is returning information about those routes requires examining the BGP session and relevant received routing information available from the provider-facing relationship. This can help determine whether the session is established and whether expected routing information is being exchanged. Local DNS records and OSPF neighbor state do not directly confirm cloud-side acceptance of BGP advertisements. In some environments, provider portals or cloud routing tables may also be required to verify the final state from the provider’s perspective.

Question 320. During a cloud-connectivity validation, an engineer wants to prove that an application remains reachable after the primary path fails. Which test should be performed?

1. Perform a controlled primary-path failure and verify application reachability over the backup path
2. Change the DNS domain name
3. Disable all routing protocols
4. Remove the backup path before testing

Correct Answer: 1. Perform a controlled primary-path failure and verify application reachability over the backup path

Explanation :-

A controlled primary-path failure is an effective way to validate whether the intended redundancy mechanism actually works. The engineer can disable or isolate the primary path during an approved test and verify route withdrawal, convergence, selection of the backup path, packet loss during transition, and continued application reachability. Simply changing DNS configuration does not validate network failover. Disabling all routing protocols would create an unrelated failure condition, while removing the backup path would prevent validation of redundancy. The test should include documented success criteria, expected convergence time, monitoring, and a rollback procedure.