Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) Practice Exam
Prepare to excel in the Cisco ENARSI certification with Exam Sage’s comprehensive practice exam designed specifically for the Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) exam. Whether you’re an experienced network professional or advancing your career in enterprise networking, this practice test will equip you with the knowledge and confidence needed to pass the official exam.
What Is the ENARSI Exam?
The Cisco ENARSI exam (300-410) validates your skills in implementing advanced routing technologies and services in enterprise networks. This exam covers critical topics such as Layer 3 routing, VPN technologies, infrastructure security, and network services necessary for enterprise environments. Passing the ENARSI exam is a crucial step towards earning the Cisco Certified Specialist – Enterprise Advanced Infrastructure Implementation certification.
What You Will Learn
With Exam Sage’s ENARSI practice exam, you will gain mastery over:
Advanced IP routing protocols including OSPF, EIGRP, and BGP configuration and troubleshooting
Implementation of MPLS Layer 3 VPNs, including route-target and route distinguisher concepts
Infrastructure security features such as control plane policing and infrastructure protection
Network services including DHCP, SNMP, QoS, and first-hop redundancy protocols
Troubleshooting complex enterprise network scenarios with a focus on real-world application
Topics Covered in This Practice Exam
OSPF Advanced Configuration and Troubleshooting
EIGRP Advanced Features and Route Summarization
BGP Path Attributes, Route Filtering, and Route Reflectors
MPLS VPN Architecture and Configuration
Infrastructure Security and Device Hardening
Network Services including QoS and SNMP
Troubleshooting Enterprise Network Infrastructure
Why Choose Exam Sage for Your ENARSI Preparation?
ExamSage.com is a trusted platform dedicated to providing high-quality, up-to-date practice exams and study materials for IT certifications. Our ENARSI practice test is meticulously crafted by networking experts to mirror the actual exam’s difficulty and format. Each question is accompanied by detailed explanations to help you understand core concepts deeply, not just memorize answers.
Realistic exam simulation for time management and confidence building
Detailed answer explanations for enhanced learning
Updated content reflecting the latest Cisco exam objectives
User-friendly platform accessible anytime, anywhere
Take the next step in your networking career with Exam Sage’s Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) Practice Exam — your gateway to success on the Cisco 300-410 ENARSI certification.
Sample Questions and Answers
1. Which two EIGRP packet types are used to establish and maintain neighbor relationships?
A. Update and Acknowledgment
B. Hello and Update
C. Hello and Acknowledgment
D. Query and Reply
Answer: C. Hello and Acknowledgment
Explanation:
Hello packets are used to establish neighbor relationships, and Acknowledgment packets confirm receipt of reliable packets like Update, Query, and Reply.
2. What is the default administrative distance of internal EIGRP routes?
A. 110
B. 120
C. 90
D. 170
Answer: C. 90
Explanation:
Internal EIGRP routes have a default administrative distance of 90. External EIGRP routes have a distance of 170.
3. In OSPF, what is the purpose of the Designated Router (DR)?
A. Maintains the shortest path tree
B. Broadcasts Hello packets to all neighbors
C. Minimizes the number of adjacencies on a broadcast network
D. Acts as the primary router for inter-area routing
Answer: C. Minimizes the number of adjacencies on a broadcast network
Explanation:
The DR reduces the number of OSPF adjacencies by acting as a central point for LSAs on broadcast and NBMA networks.
4. What is the purpose of the no auto-summary command in EIGRP?
A. Disables automatic summarization at classful boundaries
B. Enables redistribution between EIGRP processes
C. Forces manual summarization
D. Prevents route flapping
Answer: A. Disables automatic summarization at classful boundaries
Explanation:
By default, EIGRP summarizes routes at classful boundaries. no auto-summary disables this behavior, enabling classless routing.
5. Which BGP attribute is used for loop prevention in an AS-path?
A. Weight
B. Origin
C. Local Preference
D. AS-Path
Answer: D. AS-Path
Explanation:
The AS-Path attribute is used to detect loops in BGP. If a router sees its own AS in the path, it rejects the route.
6. What command is used to advertise a network in BGP?
A. network x.x.x.x
B. advertise network x.x.x.x
C. route x.x.x.x
D. bgp advertise x.x.x.x
Answer: A. network x.x.x.x
Explanation:
The network command under the BGP process is used to advertise networks that exist in the routing table.
7. What is the function of the BGP Local Preference attribute?
A. Determines external route selection
B. Influences outbound traffic from the AS
C. Prevents routing loops
D. Sets the weight of the prefix
Answer: B. Influences outbound traffic from the AS
Explanation:
Local Preference is used within an AS to determine the preferred path for outbound traffic.
8. Which OSPF LSA type is used to advertise inter-area routes from an ABR?
A. Type 1
B. Type 3
C. Type 5
D. Type 7
Answer: B. Type 3
Explanation:
Type 3 LSAs are generated by ABRs to advertise inter-area routes.
9. What is the default hello and dead interval for OSPF on broadcast networks?
A. 10 seconds and 30 seconds
B. 5 seconds and 20 seconds
C. 10 seconds and 40 seconds
D. 30 seconds and 120 seconds
Answer: C. 10 seconds and 40 seconds
Explanation:
On broadcast and point-to-point networks, the default OSPF hello interval is 10 seconds, and the dead interval is 40 seconds.
10. What is the purpose of route redistribution?
A. To eliminate routing loops
B. To configure backup routes
C. To share routes between different routing protocols
D. To summarize routes
Answer: C. To share routes between different routing protocols
Explanation:
Route redistribution enables a router to advertise routes from one routing protocol into another.
11. When configuring redistribution between OSPF and EIGRP, what must be considered to prevent routing loops?
A. Route summarization
B. Route-maps and tagging
C. Administrative distance
D. Stub areas
Answer: B. Route-maps and tagging
Explanation:
Tagging routes during redistribution helps prevent loops by identifying and filtering routes that should not be re-advertised.
12. What is a common reason for a BGP session to remain in the “Idle” state?
A. Prefix is not advertised
B. Neighbor IP is incorrect or unreachable
C. AS path loop detected
D. MTU mismatch
Answer: B. Neighbor IP is incorrect or unreachable
Explanation:
In the Idle state, BGP waits to initiate a TCP session. Incorrect IPs or connectivity issues keep it stuck here.
13. What is VRF-lite primarily used for?
A. Cloud scalability
B. Overlay routing
C. Traffic encryption
D. Network segmentation on a single router
Answer: D. Network segmentation on a single router
Explanation:
VRF-lite allows multiple isolated routing tables on the same router, supporting segmentation for services or customers.
14. In Policy-Based Routing (PBR), which configuration is required to apply a route-map to traffic?
A. Apply route-map under BGP process
B. Use set metric command
C. Apply the route-map to the interface using ip policy
D. Apply a prefix-list to the route-map
Answer: C. Apply the route-map to the interface using ip policy
Explanation:
PBR requires applying the route-map to an interface with the ip policy route-map NAME command.
15. What command verifies redistribution between routing protocols?
A. show ip protocols
B. show ip route
C. show run
D. show ip route redistributed
Answer: A. show ip protocols
Explanation:
This command shows which protocols are being redistributed and their associated configurations.
16. What does the BGP Weight attribute affect?
A. Inbound traffic
B. Route advertisement
C. Outbound traffic preference (locally)
D. AS path loop prevention
Answer: C. Outbound traffic preference (locally)
Explanation:
Weight is a Cisco proprietary attribute used only within a router to influence its outbound route selection.
17. Which feature allows BGP to advertise multiple paths to a destination for load balancing?
A. BGP Multipath
B. Confederation
C. Route Reflector
D. AS Override
Answer: A. BGP Multipath
Explanation:
BGP Multipath allows the router to install and use multiple equal-cost paths for load sharing.
18. Which OSPF area type does not allow type 5 LSAs but allows type 3 and 4?
A. Backbone Area
B. Totally Stubby Area
C. Stub Area
D. NSSA
Answer: C. Stub Area
Explanation:
Stub areas block type 5 LSAs (external routes) but allow type 3 (inter-area) and type 4 LSAs (ASBR info).
19. Which command displays BGP routes received from a specific neighbor?
A. show bgp summary
B. show ip bgp neighbor <ip>
C. show ip bgp
D. show ip bgp received-routes
Answer: B. show ip bgp neighbor <ip>
Explanation:
This command shows the routes received from a specific neighbor and their attributes.
20. What is the purpose of a route reflector in BGP?
A. Reduce eBGP hops
B. Remove the need for IGP
C. Avoid full mesh of iBGP peers
D. Speed up convergence
Answer: C. Avoid full mesh of iBGP peers
Explanation:
Route reflectors allow a scalable iBGP design by reducing the need for full mesh connectivity among routers.
21. Which command is used to summarize OSPF routes on an ABR?
A. ip summary-address ospf
B. area range
C. summary-address
D. network summarize
Answer: B. area range
Explanation:
OSPF route summarization on ABRs is done using the area <area-id> range command.
22. Which metric does OSPF use to determine the best path?
A. Hop count
B. Bandwidth
C. Delay
D. Cost
Answer: D. Cost
Explanation:
OSPF uses cost as a metric, which is calculated based on bandwidth.
23. What is the function of BGP route dampening?
A. Allows faster convergence
B. Penalizes unstable routes
C. Speeds up routing updates
D. Ignores looped routes
Answer: B. Penalizes unstable routes
Explanation:
BGP route dampening minimizes the impact of flapping routes by suppressing frequently changing prefixes.
24. When using EIGRP named mode, where is the metric configured?
A. Under router configuration
B. Under address-family
C. Under topology base
D. Under interface
Answer: C. Under topology base
Explanation:
EIGRP metrics are configured under the topology base section of the address-family configuration.
25. Which protocol uses the Reliable Transport Protocol (RTP)?
A. OSPF
B. EIGRP
C. RIP
D. BGP
Answer: B. EIGRP
Explanation:
EIGRP uses RTP to reliably deliver packets like Updates, Queries, and Replies.
26. What does an EIGRP SIA (Stuck in Active) state indicate?
A. Neighbor down
B. Route not converged
C. Loop detected
D. Packet loss
Answer: B. Route not converged
Explanation:
SIA occurs when a router doesn’t receive a reply to a query and remains in an active state indefinitely.
27. What is the effect of using maximum-paths 4 in EIGRP?
A. Allows up to four neighbors
B. Limits route redistribution
C. Allows load balancing across four equal paths
D. Increases SIA timeout
Answer: C. Allows load balancing across four equal paths
Explanation:
This allows the router to install and use up to 4 equal-cost paths for load balancing.
28. What is the purpose of the redistribute static command?
A. Advertise connected routes
B. Advertise static routes into a routing protocol
C. Summarize static routes
D. Convert static to dynamic
Answer: B. Advertise static routes into a routing protocol
Explanation:
This command injects static routes into the dynamic routing protocol’s database.
29. What does a BGP update message contain?
A. Keepalive and Open parameters
B. Withdrawn routes and new prefixes
C. Only attributes
D. Only AS-path
Answer: B. Withdrawn routes and new prefixes
Explanation:
Update messages carry information about withdrawn routes and new route advertisements.
30. Which command shows OSPF neighbor relationships?
A. show ospf summary
B. show ip ospf neighbors
C. show ospf interface
D. show ip ospf database
Answer: B. show ip ospf neighbors
Explanation:
This command displays the status and details of OSPF adjacencies with neighbor routers.
Q31. What is the purpose of the BGP next-hop-self command?
A. It resets the BGP session
B. It prevents BGP loops
C. It sets the local router as the next-hop for advertised routes
D. It filters all external BGP routes
Answer: C. It sets the local router as the next-hop for advertised routes
Explanation:
The next-hop-self command is used to ensure that iBGP routers set themselves as the next-hop for routes they advertise. This is helpful in cases where the original next-hop is unreachable.
Q32. What does an EIGRP stuck-in-active (SIA) condition indicate?
A. Authentication failure
B. Timer mismatch
C. A route query did not receive a reply in time
D. The route has been redistributed improperly
Answer: C. A route query did not receive a reply in time
Explanation:
EIGRP enters the SIA state when a route query is not responded to within the active timer, potentially indicating network issues or unreachable neighbors.
Q33. What command can be used to verify if a router is acting as a route reflector in BGP?
A. show bgp summary
B. show ip bgp
C. show ip bgp neighbors
D. show ip bgp cluster
Answer: C. show ip bgp neighbors
Explanation:
This command displays detailed information about BGP neighbors, including whether the local router is acting as a route reflector and if the neighbor is a client.
Q34. In OSPF, what is the significance of the “Area Border Router” (ABR)?
A. It connects OSPF to non-OSPF domains
B. It forms adjacencies only in backbone area
C. It connects two or more OSPF areas
D. It serves as a backup DR
Answer: C. It connects two or more OSPF areas
Explanation:
An ABR sits at the boundary between multiple OSPF areas and is responsible for summarizing and redistributing routing information between them.
Q35. Which command is used to verify redistribution between EIGRP and OSPF?
A. show ip protocols
B. show ip route ospf
C. show ip route eigrp
D. show run | include redistribute
Answer: A. show ip protocols
Explanation:
This command displays routing protocols and includes information about redistribution policies and connected networks.
Q36. What BGP attribute is used to influence the outbound path selection?
A. Weight
B. MED
C. Local Preference
D. AS-path
Answer: C. Local Preference
Explanation:
Local Preference is a BGP attribute used within an AS to determine the preferred outbound path. Higher values are preferred.
Q37. What does the command ip vrf forwarding CUSTOMER_A do on an interface?
A. Enables NAT for CUSTOMER_A
B. Assigns the interface to a VRF
C. Configures ACLs for CUSTOMER_A
D. Configures the IP address for the VRF
Answer: B. Assigns the interface to a VRF
Explanation:
This command binds the interface to a specific VRF, allowing the interface to participate in that customer-specific routing domain.
Q38. What is the default OSPF cost of a 100 Mbps Fast Ethernet interface?
A. 1
B. 10
C. 100
D. 1000
Answer: B. 10
Explanation:
OSPF calculates cost as reference bandwidth (100 Mbps by default) divided by interface bandwidth. For Fast Ethernet, the cost is 100/100 = 1, but since reference bandwidth is often set higher (like 1000 Mbps), default cost becomes 10.
Q39. Which BGP feature allows a router to maintain prefixes and advertise them even after a BGP session reset?
A. Route Reflectors
B. Graceful Restart
C. Next-Hop-Self
D. Soft Reconfiguration
Answer: B. Graceful Restart
Explanation:
Graceful Restart enables a router to retain its BGP forwarding state while restarting the control plane, ensuring minimal route disruption.
Q40. Which command displays the OSPF database for a specific router ID?
A. show ip ospf neighbor
B. show ip ospf database router x.x.x.x
C. show ip route ospf
D. show ospf interface brief
Answer: B. show ip ospf database router x.x.x.x
Explanation:
This command allows you to examine the OSPF router LSA for a specific router ID, including the links that router advertises.
Q41. What does BGP use to prevent routing loops between autonomous systems?
A. Route tags
B. MED
C. AS-Path
D. Local Preference
Answer: C. AS-Path
Explanation:
The AS-Path attribute lists all the ASes a route has traversed. If a router sees its own AS in the AS path, it drops the route to prevent loops.
Q42. Which LSA type in OSPF is used for external routes?
A. Type 3
B. Type 4
C. Type 5
D. Type 7
Answer: C. Type 5
Explanation:
Type 5 LSAs are generated by ASBRs and advertise external routes into the OSPF domain.
Q43. What is the maximum number of equal-cost paths that EIGRP can install by default?
A. 1
B. 2
C. 4
D. 16
Answer: C. 4
Explanation:
By default, EIGRP can install up to four equal-cost paths into the routing table, though this can be adjusted with configuration.
Q44. Which command is used to verify VRF routing information?
A. show ip route
B. show vrf route
C. show ip route vrf <name>
D. show ip vrf interface
Answer: C. show ip route vrf <name>
Explanation:
This command displays the routing table specific to a given VRF, helping verify route reachability within the VRF.
Q45. What is the effect of configuring maximum-paths 2 under a BGP process?
A. Installs two different routes into the RIB
B. Limits BGP neighbors to two
C. Allows BGP to load balance between two paths
D. Uses two next hops per destination
Answer: C. Allows BGP to load balance between two paths
Explanation:
The maximum-paths command in BGP enables load balancing by allowing multiple equal-cost BGP paths to be installed into the routing table.
Q46. What is the main function of the OSPF Type 3 LSA?
A. Advertise external routes into OSPF
B. Describe the router’s links
C. Summarize routes between areas
D. Identify ABRs in the network
Answer: C. Summarize routes between areas
Explanation:
Type 3 LSAs, generated by Area Border Routers (ABRs), summarize and advertise inter-area routes into non-backbone areas.
Q47. What is required for OSPF authentication to succeed between two neighbors?
A. Same router IDs
B. Identical process IDs
C. Matching authentication type and key
D. Same OSPF area number
Answer: C. Matching authentication type and key
Explanation:
For OSPF authentication to form adjacencies, the key and authentication method must match on both routers.
Q48. What is a key benefit of using Route Reflectors in BGP?
A. Prevents route loops
B. Simplifies iBGP full mesh requirement
C. Allows redistribution of static routes
D. Optimizes path selection
Answer: B. Simplifies iBGP full mesh requirement
Explanation:
Route Reflectors reduce the complexity of iBGP topologies by eliminating the need for a full mesh between iBGP peers.
Q49. Which BGP attribute is used for loop prevention and path selection in inter-AS routing?
A. Origin
B. Weight
C. AS-Path
D. MED
Answer: C. AS-Path
Explanation:
AS-Path is a well-known mandatory attribute used to prevent loops and influence path selection based on hop count.
Q50. What is the administrative distance of an EIGRP external route?
A. 90
B. 170
C. 110
D. 120
Answer: B. 170
Explanation:
External EIGRP routes have an administrative distance of 170, distinguishing them from internal EIGRP (which is 90).
Q51. In a dual-homed ISP setup, how can outbound BGP routing be influenced?
A. Using AS-PATH prepend
B. Modifying local preference
C. Adjusting MED values
D. Changing route reflectors
Answer: B. Modifying local preference
Explanation:
Local preference is used within an AS to select outbound paths. Higher values are preferred.
Q52. What does a high BGP Weight value signify?
A. Route has a long AS path
B. Route originated externally
C. Route is more preferred locally
D. Route is less trusted
Answer: C. Route is more preferred locally
Explanation:
Weight is a Cisco-specific attribute used for local route preference. It is not advertised to other routers.
Q53. What type of route is described by OSPF Type 5 LSA?
A. Intra-area route
B. Summary route
C. External route
D. Default route
Answer: C. External route
Explanation:
Type 5 LSAs advertise routes learned from other routing domains into OSPF.
Q54. Which technology allows an interface to be part of multiple routing tables on a Cisco router?
A. VLANs
B. ACLs
C. VRFs
D. NAT
Answer: C. VRFs
Explanation:
Virtual Routing and Forwarding (VRF) allows multiple routing tables on the same physical router, enabling traffic segmentation.
Q55. What does the redistribute connected command do in routing protocols?
A. Disables dynamic routing
B. Shares static routes only
C. Includes directly connected routes in the protocol
D. Summarizes routes across areas
Answer: C. Includes directly connected routes in the protocol
Explanation:
The redistribute connected command makes connected networks available in the specified routing protocol.
Q56. In BGP, which command helps view received, but not necessarily used, prefixes?
A. show ip bgp summary
B. show ip route bgp
C. show ip bgp received-routes
D. show ip bgp neighbors x.x.x.x received-routes
Answer: D. show ip bgp neighbors x.x.x.x received-routes
Explanation:
This command reveals all routes received from a neighbor, even those not installed in the routing table.
Q57. How can EIGRP load balance between unequal cost paths?
A. Enable variance
B. Increase hold time
C. Set path delay to equal
D. Enable fast convergence
Answer: A. Enable variance
Explanation:
The variance command in EIGRP allows it to use multiple paths with unequal metrics for load balancing.
Q58. What is the purpose of a prefix-list in BGP?
A. Adjust route metric
B. Set default gateway
C. Filter routes by prefix length
D. Enable loop prevention
Answer: C. Filter routes by prefix length
Explanation:
Prefix-lists provide a way to match IP prefixes and prefix lengths, often used in route filtering and distribution.
Q59. Which technology can be used to detect route failures more rapidly than standard OSPF hello/dead timers?
A. BFD (Bidirectional Forwarding Detection)
B. SNMP traps
C. Route summarization
D. EIGRP timers
Answer: A. BFD (Bidirectional Forwarding Detection)
Explanation:
BFD provides low-overhead, rapid failure detection independent of the routing protocol.
Q60. Which of the following BGP communities is transitive?
A. No-Advertise
B. Local-AS
C. Internet
D. No-Export
Answer: C. Internet
Explanation:
The “Internet” community is transitive and indicates that the route can be advertised to any BGP peer.
Q61. What does the BGP “soft-reconfiguration inbound” command allow?
A. Allows path switching
B. Prevents route flapping
C. Stores routes for policy changes
D. Enables OSPF-BGP redistribution
Answer: C. Stores routes for policy changes
Explanation:
This command allows the router to store all incoming routes so that policy changes can be applied without resetting the BGP session.
Q62. What is the effect of OSPF route summarization at an ABR?
A. Reduces SPF calculations
B. Blocks external routes
C. Redistributes BGP routes
D. Multiplies LSAs
Answer: A. Reduces SPF calculations
Explanation:
Summarization limits the number of routes propagated into an area, which reduces the size and complexity of SPF calculations.
Q63. Which BGP attribute is not advertised to other peers?
A. AS-Path
B. MED
C. Weight
D. Origin
Answer: C. Weight
Explanation:
Weight is a Cisco proprietary attribute used for local decision making and is not shared between routers.
Q64. In EIGRP, what does the “Reported Distance” refer to?
A. Best metric to destination
B. Local calculated metric
C. Neighbor’s advertised metric
D. External route distance
Answer: C. Neighbor’s advertised metric
Explanation:
Reported Distance is the metric a neighbor reports to reach a destination. It is used in Feasibility Condition checks.
Q65. Which command verifies the interfaces participating in a VRF instance?
A. show vrf interfaces
B. show ip interface brief
C. show vrf forwarding
D. show ip vrf
Answer: A. show vrf interfaces
Explanation:
This command shows which interfaces are associated with each VRF.
Q66. What is the default hello interval for OSPF on broadcast links?
A. 5 seconds
B. 10 seconds
C. 30 seconds
D. 60 seconds
Answer: B. 10 seconds
Explanation:
The OSPF hello interval on broadcast and point-to-point networks is 10 seconds by default.
Q67. Which command is used to filter routing updates based on prefix in OSPF?
A. ip ospf filter-list
B. distribute-list
C. route-map ospf
D. ospf route-policy
Answer: B. distribute-list
Explanation:distribute-list can be applied in OSPF to filter routes at redistribution points or on incoming/outgoing updates.
Q68. Which OSPF area type blocks Type 5 LSAs but allows Type 7 LSAs?
A. Stub
B. Totally Stubby
C. NSSA
D. Backbone
Answer: C. NSSA
Explanation:
Not-So-Stubby Areas (NSSAs) do not allow Type 5 LSAs but permit Type 7 LSAs which are translated at the ABR.
Q69. How does EIGRP detect if a neighbor has gone down?
A. SPF recalculation
B. BFD
C. Hello and Hold timers
D. Dead Timer
Answer: C. Hello and Hold timers
Explanation:
EIGRP uses Hello packets to maintain neighbor relationships and the Hold timer to determine when a neighbor is considered down.
Q70. What is the function of a BGP confederation?
A. Prevent OSPF redistribution
B. Simplify iBGP full mesh
C. Limit eBGP paths
D. Extend OSPF LSAs
Answer: B. Simplify iBGP full mesh
Explanation:
BGP confederations divide an AS into sub-ASes, reducing the iBGP mesh requirement while maintaining BGP rules.
