Cisco 300-410 Implementing Cisco Enterprise Advanced Routing and Services ENARSI Exam Practice Test

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Total 575 questions
Question 1

How are CE advertised routes segmented from other CE routers on an MPLS PE router?



Answer : D

In an MPLS PE router, CE advertised routes are segmented from other CE routers by assigning CE-facing interfaces to different Virtual Routing and Forwarding (VRF) instances12. A VRF is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time. By associating a network interface with a VRF, the network layer (Layer 3) has a different view of the network topology. This allows the segmentation of routing paths for traffic from different customers or different types of traffic.In the context of MPLS, VRFs are used to create separate routing instances for each customer on a PE router3.


Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) training videos

CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide

Implementing Cisco Enterprise Advanced Routing and Services source documents or study guide

MPLS routes to advertise from CE to PE - Cisco Community

Configuring Route Exchange Between PE and CE Devices - CloudEngine 12800 and 12800E V200R005C10 Configuration Guide - VPN - Huawei

Customer edge router - Wikipedia

Question 2

Refer to the exhibit.

An engineer recently implemented uRPF by configuring the ip verify unicast source reachable-via rx command on interface gi0/3 The engineer noticed right after implementing F that an inbound packet on the giO-3 interface with a source address of 172 16 3 251 was dropped. Which action resolves the issue?



Answer : A

Option A configures uRPF loose mode to forward the packet. This mode allows the router to check if there is a route in the routing table that matches the source IP address of the incoming packet, regardless of the interface that is used to reach the source.This mode is suitable for networks that have asymmetric routing, where the incoming and outgoing interfaces for a packet may differ2.

Option B permits the 172.16.3.251 in the inbound ACL on interface gi0/3. This option does not resolve the issue, because it only allows the packet to pass the ACL check, but not the uRPF check.The packet will still be dropped by uRPF if there is no route to reach the source IP address via the same interface3.

Option C permits the 172.16.3.251 in the inbound ACL on interface gi0/3 to allow 172.16.3.251. This option is redundant and incorrect, because it repeats the same IP address twice in the ACL statement.It also does not resolve the issue for the same reason as Option B3.

Option D configures uRPF strict mode to forward the packet. This option does not resolve the issue, because it is the same mode that was already configured on the interface. Strict mode requires that the router has a route to reach the source IP address via the same interface where the packet was received.If this condition is not met, the packet will be dropped4.


Question 3

Refer to the exhibit.

Refer to the exhibit After an engineer modified the configuration for area 7 to permit type 1 2 and 7 LSAs only users connected to router R9 reported that they could no longer access the internet. Which configuration restores internet access to users on R9 and permits only LSA type 1,2, and 7?

A)

B)

C)

D)



Answer : B

Option B configures area 7 as a not-so-stubby area (NSSA) with theno-summaryoption on the area border router (ABR) R4. This allows the injection of external routes from EIGRP into the OSPF domain as type 7 LSAs, while preventing the propagation of inter-area summary LSAs into area 7.Theno-summaryoption also generates a default summary route for area 7, which can be used by R9 to reach the internet2.

Option A configures area 7 as a stub area, which does not allow any external routes or type 7 LSAs in the area.This prevents R9 from learning the EIGRP routes and accessing the internet3.

Option C configures area 7 as a NSSA without theno-summaryoption on R4. This allows the injection of type 7 LSAs into the area, but also allows the propagation of inter-area summary LSAs into the area.However, this option does not generate a default summary route for area 7, which means R9 has no route to reach the internet4.

Option D configures area 7 as a NSSA with thedefault-information originateoption on R4. This allows the injection of type 7 LSAs into the area, but also allows the propagation of inter-area summary LSAs into the area. Thedefault-information originateoption generates a type 7 default route for area 7, which can be used by R9 to reach the internet.However, this option is redundant and less efficient than Option B, because it injects both a type 3 and a type 7 LSA for the default route into the area5.


Question 4

Refer to the exhibit.

Refer to the exhibit. Which configuration resolves the issue?

A)

B)

C)

D)



Answer : D


Question 5

Refer to the exhibit.

Refer to the exhibit. An engineer is troubleshooting a prefix advertisement issue from R3, which is not directly connected to R1. Which configuration resolves the issue?

A)

B)

C)

D)



Answer : A


Question 6

Refer to the exhibit.

Refer to the exhibit. A network engineer troubleshooting a packet drop problem for the host 172.16.100.5 notices that only one link is used and installed on the routing table, which saturates the bandwidth. Which action must the engineer take to resolve the high bandwidth utilization problem and share the traffic toward this host between the two available links?



Answer : B


Question 7

Refer to the exhibit.

Refer to the exhibit Users from the 192 168.2.0/24 network cannot connect to the 172.16 2 32/28 network Which configuration resolves the issue'?

A)

B)

D)



Answer : A


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Total 575 questions