CCNP Implementing Cisco IP Routing (ROUTE v2.0) Free Practice Test — 30 Questions

Question 1

Anya, a network engineer responsible for a critical enterprise WAN, is alerted to a sudden loss of connectivity between two sites. Investigation reveals that the OSPF neighbor relationship between a Cisco ISR 4431 router at Site A and a Cisco Catalyst 9300 switch acting as an OSPF router at Site B has gone down. This adjacency was previously stable. Anya needs to quickly restore routing information exchange. Which of the following diagnostic approaches would most effectively pinpoint the root cause of the OSPF adjacency failure in this scenario?

Accepted Answer

Examining the OSPF interface configuration parameters, including network type, hello/dead timers, authentication settings, and subnet masks on both the ISR 4431 and the Catalyst 9300, to identify any discrepancies that prevent adjacency formation.

Question 2

Consider a sprawling enterprise network utilizing OSPF as its routing protocol. A specific, geographically dispersed branch office network segment has been identified as requiring strict isolation from external routing advertisements originating from other OSPF areas to conserve router resources and simplify routing tables. However, this branch office segment also needs to advertise its own unique, locally significant external routes into the broader OSPF domain. Which OSPF area configuration best achieves this dual objective of minimizing LSDB proliferation from external sources while enabling the controlled injection of local external routes?

Accepted Answer

A totally stubby NSSA

Question 3

A network administrator is troubleshooting a complex enterprise network that has recently undergone a significant expansion, introducing new data centers and cloud connectivity. Users are reporting intermittent connectivity to critical applications and noticeable latency spikes. Router A is directly connected to Network X, with its current best path (successor) to Network X having a feasible distance (FD) of 10. Router B, a neighboring router, advertises a path to Network X with a reported distance (RD) of 12. If the current successor path for Router A to Network X were to fail, which of the following accurately describes the immediate impact on Router A\'s routing table concerning the path advertised by Router B?

Accepted Answer

Router B's advertised path will not be installed as a feasible successor because its reported distance is greater than Router A's current feasible distance.

Question 4

A network administrator is troubleshooting intermittent reachability to a critical internal application server hosted in a remote data center. The company\'s internal network utilizes EIGRP as the routing protocol. Analysis of the EIGRP topology table on the edge router closest to the application server reveals that while multiple paths exist, traffic is predominantly flowing over a single path. The configuration includes `variance 2` on the EIGRP process, indicating that unequal-cost load balancing is intended. However, a deep dive into the EIGRP metrics for the alternative paths shows a significant discrepancy, with one path exhibiting a substantially higher metric than the primary path, attributed to a misconfigured interface on an intermediate router impacting bandwidth calculations. During periods of peak traffic, or when the primary path experiences minor link degradation, users report temporary unresponsiveness to the application server. What is the most probable underlying cause for the observed intermittent reachability and the lack of effective load balancing despite the `variance` configuration?

Accepted Answer

The Feasible Condition for EIGRP is not being met for the alternative path, preventing its installation as a feasible successor and thus the intended load balancing.

Question 5

A network administrator is troubleshooting an OSPF deployment across a multi-site enterprise network. They have observed that after a critical WAN link experiences intermittent packet loss, the routing tables in the affected OSPF areas take an extended period to stabilize, and there are instances of routes flapping between primary and backup paths. The administrator suspects a misconfiguration in the OSPF timers might be contributing to this behavior. Which OSPF timer configuration, if set to a significantly longer value than the default, would most directly lead to the observed slow reconvergence and potential routing instability?

Accepted Answer

Configuring a longer Dead Timer

Question 6

A network administrator is troubleshooting a complex enterprise network where several branch offices are reporting sporadic loss of connectivity and routing flaps. Upon initial investigation, it is discovered that the core EIGRP routing domain is experiencing significant instability. The configuration on the core routers reveals the command `passive-interface default` has been implemented across the entire EIGRP process. However, the administrator intended for EIGRP to establish neighbor adjacencies with routers in all connected segments. Which action is most critical to resolve the routing instability and restore full connectivity between the branch offices?

Accepted Answer

Remove the `passive-interface default` command and explicitly enable EIGRP on all interfaces that should participate in EIGRP routing.

Question 7

A network administrator is troubleshooting intermittent reachability issues between a newly acquired branch office and the corporate headquarters. The company utilizes EIGRP as its primary routing protocol. Initial investigation reveals that while users at HQ can access resources at the branch office without problems, users at the branch office experience sporadic failures when attempting to connect to services hosted at HQ. The branch office\'s EIGRP configuration was inherited from its previous network environment and has not yet been fully audited or optimized for integration with the corporate network. Which of the following actions, if implemented, is most likely to resolve this directional connectivity problem by ensuring consistent EIGRP behavior across the combined network?

Accepted Answer

Reconfigure the EIGRP K-values on the edge routers of the branch office to precisely match the K-values configured on the core routers at headquarters.

Question 8

Anya, a network operations lead for a high-frequency trading firm, is experiencing intermittent disruptions to critical transaction flows. Analysis of network telemetry indicates that during link failures between core routers, the OSPFv2 convergence time is exceeding acceptable thresholds, leading to packet loss. The current OSPFv2 configuration uses default timers. Anya needs to implement a configuration adjustment that will most effectively reduce the Mean Time To Recover (MTTR) for routing information following a topology change, ensuring minimal impact on real-time financial data. Which of the following OSPFv2 configuration adjustments would most directly and significantly improve convergence speed in this scenario?

Accepted Answer

Reducing the OSPF SPF initial and backoff timers, and decreasing the LSA retransmission interval.

Question 9

Anya, a network engineer managing a multi-site enterprise network, is experiencing intermittent connectivity issues on a crucial T1 link connecting branch router R1 to the main office router R2. Both routers are configured to run OSPF. Anya has observed that the OSPF neighbor relationship between R1 and R2 frequently drops and re-establishes, leading to significant latency and packet loss for users at the branch. R1 has a point-to-point T1 connection to R2, and this interface is configured as part of the OSPF process. Anya suspects an OSPF timer mismatch on this specific interface. Which OSPF timer configuration, when applied consistently to the interface connecting R1 and R2 on both devices, would most effectively resolve this adjacency instability on a point-to-point link?

Accepted Answer

Set the OSPF Hello interval to 30 seconds and the Dead interval to 120 seconds on the interface connecting R1 and R2 for both routers.

Question 10

A network administrator is investigating sporadic connectivity failures between a remote branch office and a specific customer subnet located in a different OSPF area. During routine checks, it was observed that OSPF neighbor adjacencies are stable, and all expected routes are present in the routing tables of routers within the branch office\'s area. However, when traffic is sourced from the branch office and destined for IPs within the customer subnet, packets are intermittently dropped. Further investigation reveals that an Area Border Router (ABR) connecting the branch office\'s area to the backbone area is configured with manual route summarization for the customer\'s network prefix. The administrator suspects that the summarization is contributing to the problem, especially since the underlying specific routes within the summarized range have experienced occasional flapping due to a recent fiber cut affecting a less critical link. What is the most probable underlying cause for the intermittent reachability issue, given these observations?

Accepted Answer

The ABR's manual summarization is advertising a stale or incorrect aggregate route, leading to traffic being misdirected when the more specific internal routes become unavailable or less optimal.

Question 11

A network administrator is troubleshooting intermittent reachability issues between two branch offices (BranchA and BranchB) connected via an MPLS VPN, with a central router (HubRouter) acting as the spokes\' gateway. Both branch routers are configured as EIGRP stub routers, and HubRouter is advertising summarized routes to them. EIGRP adjacencies between the branch routers and HubRouter are consistently up, yet certain application traffic flows between BranchA and BranchB experience packet loss and timeouts. The issue is not related to interface errors, IP address conflicts, or basic ACL blocking. The problem tends to occur after periods of stable operation and is specific to certain communication patterns rather than a complete loss of connectivity. What is the most likely underlying EIGRP behavior contributing to this specific intermittent reachability problem?

Accepted Answer

The precise calculation of EIGRP metrics for summarized routes advertised by the hub router, influenced by internal metric fluctuations or policy applications, is causing suboptimal path selection for specific traffic flows due to the stub routers' inability to query beyond the hub.

Question 12

Anya, a network architect, is configuring BGP on R1 to establish connectivity with multiple upstream Internet Service Providers (ISPs). She has a strict service-level agreement (SLA) with \"HorizonConnect\" that mandates traffic to a specific customer prefix be routed through their network for optimal performance. Anya has already configured a high local preference value (e.g., 300) on the BGP session with HorizonConnect. However, R1 continues to select a path via \"SkyLink,\" another ISP, for the target prefix, likely due to a shorter AS_PATH or other factors evaluated later in the BGP best path selection algorithm. To enforce the SLA and direct traffic exclusively through HorizonConnect, what BGP manipulation strategy should Anya implement on R1\'s incoming advertisements from SkyLink and other non-HorizonConnect ISPs to make those paths demonstrably less attractive than the HorizonConnect path?

Accepted Answer

Prepend the AS number of the originating AS for the non-HorizonConnect paths to their AS_PATH attribute.

Question 13

Innovate Solutions, a rapidly expanding enterprise, is migrating a significant portion of its critical business applications to a multi-cloud environment while simultaneously integrating a new SD-WAN overlay. Their current internal network utilizes OSPF for routing. Given these strategic shifts and the need to maintain high application availability and low latency for a globally distributed workforce, what fundamental routing paradigm shift should the network engineering team prioritize to ensure optimal performance and scalability?

Accepted Answer

Implement a hybrid routing strategy that leverages BGP for inter-cloud and SD-WAN edge connectivity, while continuing to optimize OSPF for internal campus and data center segments, with careful route summarization and redistribution policies.

Question 14

Anya, a network architect for a global financial institution, is investigating a persistent issue of increased packet loss and latency affecting critical trading applications. Her initial diagnostic sweep reveals that OSPF adjacencies are stable, interface utilization is within normal bounds, and no obvious routing loops are detected within the internal OSPF domain. However, users report intermittent slowdowns and dropped connections. Anya suspects an underlying issue related to how external traffic is being brought into the network and how internal routing decisions are being influenced by external policies. She is particularly concerned about the potential impact of attributes learned from external autonomous systems that might be subtly influencing path selection within her own network, leading to suboptimal routing for sensitive application traffic.

Which of the following, if misconfigured, would most likely explain Anya\'s observations of performance degradation without immediate OSPF adjacency flapping or obvious routing loops?

Accepted Answer

Incorrect configuration of BGP's Multi-Exit Discriminator (MED) attribute influencing inbound path selection from external autonomous systems.

Question 15

Anya, a senior network engineer for a multinational technology firm, is tasked with enhancing the routing infrastructure\'s responsiveness to dynamic changes. The current network, a sprawling enterprise with thousands of endpoints and a mix of physical and virtualized network functions, primarily utilizes OSPF across its core and distribution layers, with static routes safeguarding critical server segments. Recent shifts towards a DevOps culture have introduced more frequent application deployments and network modifications, leading to noticeable delays in traffic rerouting following link degradations or topology alterations. Anya needs to implement a strategy that minimizes the impact of these changes on application availability and ensures a swift return to optimal routing paths without a complete overhaul of the existing routing protocol suite.

What strategic adjustment to the OSPF implementation would most effectively address Anya\'s need for improved routing adaptability and reduced convergence times in this evolving environment?

Accepted Answer

Implement route summarization at all Area Border Routers to reduce the scope of routing updates and the size of routing tables within areas.

Question 16

A network engineer is troubleshooting suboptimal path selection in an EIGRP-enabled network. They suspect that the EIGRP metric calculation has been deliberately altered to influence route preference. Analysis of the EIGRP topology table reveals that a specific path, which should ideally be less preferred due to its higher latency, is being consistently chosen by EIGRP. The engineer hypothesizes that the bandwidth and delay values configured on the interfaces along this path have been manipulated. To make this specific path appear more attractive to EIGRP, which of the following adjustments to the interface configuration would be the most direct and effective method?

Accepted Answer

Increase the interface's configured bandwidth value to a higher number.

Question 17

A network administrator is tasked with optimizing traffic flow for a critical application within a multi-homed enterprise network. The enterprise is connected to two upstream Internet Service Providers (ISPs), AS 65001 and AS 65002, via BGP. The internal BGP router, R1, is receiving route advertisements for the destination network 192.168.10.0/24 from both ISPs. Initial analysis shows that the path through AS 65001 offers a slightly lower MED value, and the AS_PATH length is also one hop shorter compared to the path through AS 65002. However, due to contractual obligations and performance monitoring, it is imperative that all traffic destined for 192.168.10.0/24 egresses through AS 65002. Which BGP configuration change on R1 would most effectively achieve this objective, ensuring that the path through AS 65002 is consistently preferred by R1 for this specific destination prefix?

Accepted Answer

Configure a higher Local Preference for routes learned from the neighbor in AS 65002.

Question 18

An enterprise network utilizes EIGRP for routing between its core routers. Router R1 is connected to a critical subnet at `192.168.10.0/24`, and another subnet at `192.168.20.0/24`. Connectivity to these subnets from other parts of the network, specifically from clients behind Router R3, is intermittently failing. Network administrators have identified that R2 is advertising routes to R3, and a route-map named `FILTER_OUT_TO_R3` is applied outbound on the interface of R2 facing R3. This route-map is intended to control which EIGRP routes are advertised. An analysis of the route-map configuration reveals that it contains a sequence which explicitly permits `192.168.10.0/24` and `192.168.20.0/24`, but subsequently denies all other IP prefixes. What is the most likely consequence of this specific route-map configuration on the reachability of `192.168.10.0/24` and `192.168.20.0/24` from clients behind R3?

Accepted Answer

The route-map `FILTER_OUT_TO_R3` applied outbound on R2's interface towards R3 has a sequence that explicitly permits `192.168.10.0/24` and `192.168.20.0/24` but denies all other prefixes, leading to a situation where R2 only advertises these two specific subnets, and any underlying path or processing issue for these advertised routes would result in their unreachability from R1.

Question 19

Consider an enterprise network where EIGRP is the chosen routing protocol. A network administrator is tasked with optimizing routing stability and convergence time across a multi-tiered network architecture. The administrator decides to implement route summarization at the edge of a large internal EIGRP domain to reduce the scope of routing updates and improve router performance. Which of the following statements accurately describes the primary benefit of implementing EIGRP route summarization in this scenario?

Accepted Answer

Reduces the size of EIGRP routing tables and limits the scope of routing reconvergence during topology changes.

Question 20

Following a complex network upgrade involving the integration of an EIGRP routing domain into an existing OSPF network, with route summarization applied at the ABR connecting the two areas, an unusual issue has emerged. While general network connectivity remains stable, specific application traffic between client segments in the OSPF domain and servers located in the EIGRP domain is intermittently failing. Troubleshooting reveals that the OSPF routers are advertising the summarized prefix correctly, but packets destined for certain subnets within that prefix appear to be dropped. Other traffic flows utilizing different subnets within the same summarized prefix are functioning as expected. What is the most probable underlying cause for this selective traffic failure after the implementation of OSPF summarization and EIGRP redistribution?

Accepted Answer

The OSPF summarization boundary is advertising the summary prefix with a metric that is less optimal than the actual best path to the constituent subnets, causing suboptimal routing for specific destinations.

Question 21

Anya, a network engineer, is investigating a persistent yet intermittent reachability issue within a large IPv6 enterprise network utilizing OSPFv3. While OSPFv3 neighbor adjacencies between core routers remain stable, certain critical IPv6 subnets experience sporadic connectivity loss. Hosts within these affected subnets can communicate for extended periods, then suddenly become unreachable, only to regain connectivity later without any manual intervention. Anya has confirmed that no interfaces are flapping, and all OSPFv3 parameters, including process IDs and network statements, are correctly configured across all participating routers. She suspects the problem lies in a subtle aspect of OSPFv3\'s route calculation or path selection mechanism that might be influenced by specific traffic flows or network conditions, leading to this inconsistent behavior.

What is the most probable underlying cause for Anya\'s observed intermittent reachability problems, considering the stable OSPFv3 adjacencies and the selective nature of the connectivity loss?

Accepted Answer

The network topology might be configured to utilize unequal cost load balancing for certain routes, and specific traffic flows are intermittently experiencing degraded performance on one of the available paths, leading to perceived reachability issues for affected hosts.

Question 22

Anya, a network engineer overseeing a complex OSPF deployment with multiple areas, is investigating a connectivity issue. Users in Area 0 are unable to reach hosts within the 192.168.10.0/24 subnet, which is advertised by a router exclusively within Area 1. Inspection of the OSPF LSDB on routers in Area 0 reveals that no Type 3 LSA for 192.168.10.0/24 is present. The Area Border Router (ABR) connecting Area 1 to Area 0 is functioning correctly and has an adjacency with its neighbor in Area 0. Which of the following configurations on the ABR is the most probable cause for the absence of the Type 3 LSA in Area 0?

Accepted Answer

An outbound prefix-list applied to the ABR's interface facing Area 0 denies the 192.168.10.0/24 prefix.

Question 23

Anya, a senior network architect, is tasked with integrating a newly acquired subsidiary’s network, which utilizes a distinct IP addressing scheme and a mix of EIGRP and static routing, into the parent company’s predominantly OSPF-based infrastructure. The integration must be seamless, minimizing downtime and ensuring data integrity. Anya anticipates potential conflicts in routing adjacencies, summarization requirements, and the need to redefine redistribution policies between the different routing protocols. She must also manage expectations with business units in both organizations regarding the transition timeline and potential performance impacts. Which of the following behavioral competencies is most critical for Anya to effectively navigate this complex network integration scenario?

Accepted Answer

Adaptability and Flexibility

Question 24

Consider a network where EIGRP is the dominant routing protocol. A network administrator is troubleshooting an intermittent reachability issue to a critical server located in a remote subnet. Analysis of the routing tables reveals that the same destination network is being learned via two different EIGRP neighbors, R1 and R2. R1 is advertising the route with a reported distance of 2,560,000 and a feasible distance of 2,816,000. R2 is advertising the same route with a reported distance of 2,600,000. The current successor for this destination is learned via R1. What is the most likely outcome regarding EIGRP\'s path selection and convergence if the link to R1 fails, assuming no other routing protocols are influencing the path and R2\'s advertisement meets EIGRP\'s internal criteria for a valid path?

Accepted Answer

EIGRP will immediately install the route via R2 as the new successor because R2's reported distance is less than R1's feasible distance, satisfying the feasible condition.

Question 25

During a critical network infrastructure overhaul, an organization is migrating its primary data center services to a new facility. To manage inbound traffic flow effectively during this transition, the network engineering team needs to ensure that external networks preferentially route traffic towards the new egress points (AS 65001) rather than the older, soon-to-be-decommissioned egress points (AS 65002). The organization has direct peering with multiple Internet Service Providers (ISPs). Which BGP attribute manipulation strategy would best achieve this inbound traffic engineering goal for the new data center egress?

Accepted Answer

Advertise a higher LOCAL_PREF value on the BGP sessions originating from AS 65001 towards the external ISPs compared to the LOCAL_PREF value advertised on the BGP sessions originating from AS 65002.

Question 26

A network architect is tasked with optimizing an OSPF deployment across a large enterprise. They decide to implement route summarization between Area 1 and Area 2 to reduce the LSDB size in Area 2 and improve routing table efficiency. The ABR connecting Area 1 to Area 2 is configured with the command `area 1 range 192.168.0.0 255.255.252.0`. Assuming the ABR has valid routes originating from Area 1 that fall within the 192.168.0.0/22 network, what type of Link-State Advertisement (LSA) will be generated by the ABR and flooded into Area 2 to represent this summarized prefix?

Accepted Answer

Type 3 LSA

Question 27

Anya, a senior network architect for a multinational corporation, is reviewing BGP routing policies for a new international backbone. Her company\'s AS (AS 65001) has peering relationships with AS 200 and AS 400. Both AS 200 and AS 400 provide connectivity to a major internet exchange point where AS 300 resides. Current network monitoring indicates that traffic from AS 100, a significant business partner, to destinations within AS 300 is predominantly traversing AS 400. However, a new service level agreement (SLA) with AS 200 mandates that traffic originating from AS 100 destined for AS 300 must preferentially use the path through AS 200, even if AS 400 offers a shorter AS-path length. Anya needs to implement a BGP configuration within AS 65001 to enforce this policy. Which BGP attribute manipulation is the most effective and standard method to achieve this objective without impacting other routing decisions across the enterprise?

Accepted Answer

Increase the local preference for routes learned from AS 200 that are destined for AS 300.

Question 28

A network administrator is troubleshooting a connectivity issue between two internal corporate subnets, $192.168.10.0/24$ and $192.168.20.0/24$, within a campus network. All devices in both subnets can successfully access the internet. However, hosts in the $192.168.10.0/24$ subnet are unable to communicate with hosts in the $192.168.20.0/24$ subnet. The primary device responsible for inter-VLAN routing is a Cisco Catalyst 3850 Series switch, which serves as the default gateway for both subnets. The administrator recalls that a recent change involved reconfiguring the switch\'s default route from a dynamic protocol to a static default route pointing to the organization\'s edge firewall for enhanced security and control over internet traffic. This change was intended solely to manage external access. What is the most probable underlying cause for the failure of internal subnet-to-subnet communication?

Accepted Answer

The Layer 3 switch has lost the directly connected routes for the internal VLAN subnets due to the static default route configuration.

Question 29

A network administrator is configuring a Cisco router that participates in both an OSPF and an EIGRP domain. The router has learned a specific network prefix, 192.168.10.0/24, from both protocols. The OSPF process is configured with its default administrative distance, and the EIGRP process is also using its default administrative distance. Considering the inherent preference mechanisms of Cisco IOS routing, which routing protocol\'s path to 192.168.10.0/24 will be installed in the routing table, and what is the fundamental principle governing this selection?

Accepted Answer

EIGRP will be preferred because its default administrative distance is lower than OSPF's, indicating a higher level of trust in the learned route.

Question 30

A network administrator is troubleshooting connectivity issues in a complex enterprise network. The routing table on a Cisco router, R1, shows multiple entries for the destination network 192.168.10.0/24. The router has learned this route via OSPF, EIGRP, and a manually configured static route. The EIGRP network type is configured for IP, and OSPF is running on all relevant interfaces. Given the default administrative distance values for these protocols, what is the most likely routing entry R1 will select as the primary path for traffic destined to 192.168.10.0/24?

Accepted Answer

Static route to 192.168.10.0/24 via 10.1.1.1

CCNP Implementing Cisco IP Routing (ROUTE v2.0) Free Practice Test — 30 Questions

A lot more is already mapped out

About the CCNP Implementing Cisco IP Routing (ROUTE v2.0) Certification