📘 Free JN0-664-JNCIP-SP Sample Questions
R2 is receiving the same route from R1 and R3. You must ensure that you can load balance traffic for that route.
Referring to the exhibit, which configuration change will allow load balancing?
A
Configure the multipath parameter under the global BGP configuration.
B
Apply the prepend policy as an import policy under group R1.
C
Configure the multipath multiple-as parameter under the global BGP configuration.
D
Apply the prepend policy as an import policy under group R3.
Correct Answer:
C. Configure the multipath multiple-as parameter under the global BGP configuration.
You are troubleshooting the connection between AS 64496 and AS 64497 and notice that only one of the paths is
being used for traffic forwarding.
Referring to the exhibit, which three actions will ensure that R1 is configured properly for load balancing BGP
routes? (Choose three.)
A
Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops.
B
Verify that the multipath option is configured under protocols bgp on both R2 and R3.
C
Verify that there is a load balancing export policy under routing-options for the received BGP routes on R1.
D
Verify that the multipath option is configured under protocols bgp on R1.
E
. Verify that an import load balancing policy exists under protocols bgp for the received BGP routes on R1.
Correct Answer:
A. Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops.
After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact
caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot.
Which three configuration statements accomplish this task? (Choose three.)
A
set protocols ospf3 realm ipv4-unicast overload timeout 900
B
set protocols ospf overload
C
set protocols ospf overload timeout 900
D
set protocols ospf3 overload
E
set protocols ospf3 overload timeout 900
Correct Answer:
A. set protocols ospf3 realm ipv4-unicast overload timeout 900
Explanation:
The correct answers ACE effectively reduce the impact of suboptimal routing in an OSPF and OSPFv3
network after a power outage.
1. Rationale for ACE:
A (set protocols ospf3 realm ipv4-unicast overload timeout 900) and C (set protocols ospf overload
timeout 900) allow for a timed overload condition that enables grace periods for neighbor
establishment, mitigating routing instability post-reboot. They ensure that routers do not immediately
engage in full OSPF operations, which can lead to transient routing loops and increased convergence
time.
B (set protocols ospf overload) directly engages OSPF overload functionality, signaling to
neighboring routers that this router is temporarily unable to handle normal routing traffic. This
contributes to a more stable routing environment immediately after reboot.
2. Evaluation of Incorrect Options:
D (set protocols ospf3 overload) lacks the timeout specification necessary for proper management of
the overload condition, making it less effective for dynamically adjusting to post-power outage
environments.
E (set protocols ospf3 overload timeout 900) is misleading in the context of OSPFv3, as this
statement does not encapsulate the necessary configuration language for effective routing in IPv4
environments while exclusively targeting OSPFv3.
3. Conclusion:The effective application of ACE allows network operators to mitigate transient
disruptions efficiently. By strategically timing the overload conditions during neighbor establishment
and enabling graceful degradation of routing protocols, overall network stability is significantly
improved post-reboot.
Juniper Networks OSPF Overview
Junos OS OSPF Configuration Guide
Best Practices for Deploying OSPF in an Enterprise Network
You are configuring anycast RP for load balancing and redundancy in your PIM-SM domain. You want to share
active sources between RPs.
In this scenario, what are two solutions that will accomplish this task? (Choose two.)
A
Configure MSDP on each RP router.
B
Configure anycast PIM with the rp-set statement on each RP router.
C
. Configure anycast PIM with the rp-set statement on each source DR router.
D
Configure MSDP on each source DR router.
Correct Answer:
A. Configure MSDP on each RP router.
Explanation:
AC is correct because configuring MSDP on each RP router enables multicast source information sharing,
while anycast PIM with the rp-set statement enhances RP redundancy and load balancing.
By implementing Multicast Source Discovery Protocol (MSDP) between RPs, each RP can learn about active
multicast sources from the other RPs. This allows for optimal source selection and load balancing among active
sources, which is critical for efficient multicast traffic handling in a PIM-SM domain. MSDP fosters cooperation
between RPs, enabling shared active sources for the multicast groups they manage.
In contrast, option B, configuring anycast PIM with the rp-set statement on each RP router, does not directly
facilitate source information sharing. While it enables anycast RP functionality, it lacks the capability to
communicate active source information between RPs, which is essential for redundancy.
Option C, configuring anycast PIM with the rp-set statement on each source DR router, is incorrect because
the source DR routers do not share multicast source information with RPs; their primary role is to manage
local sources. Thus, this arrangement does not achieve the desired redundancy and load balancing between
RPs.
References:
Lastly, D is flawed because having MSDP configured on the source DR routers does not contribute to the
necessary inter-RP source information sharing. Communication and redundancy are achieved through RP-to-
RP MSDP sessions rather than directly from the source DR routers.
https://www.juniper.net/documentation/en_US/junose/topics/concept/multicast-msdp-overview.html
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/configuration/15-s/multicast-ip-multi-15-s-
book/m-sdp-advanced.html
https://www.networkworld.com/article/2699041/understanding-multicast-routing-protocols.html
Which two statements are correct about VPLS tunnels? (Choose two.)
A
BGP-signaled VPLS tunnels require manual provisioning of sites.
B
LDP-signaled VPLS tunnels only support control bit 0.
C
LDP-signaled VPLS tunnels use auto-discovery to provision sites.
D
BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
Correct Answer:
B. LDP-signaled VPLS tunnels only support control bit 0.
Explanation:
BD is correct because BGP-signaled VPLS tunnels require manual provisioning, and LDP-signaled tunnels
utilize control bit 0 during signaling.
Reasoning for BD:
without prior configuration.
1. BGP-signaled VPLS (Answer A): In BGP-based VPLS implementations, the control messages for site
discovery and configuration are exchanged via BGP. This process necessitates manual provisioning of
end systems or VPLS instances to establish tunnels, as BGP will not autonomously provision sites
2. LDP-signaled VPLS (Answer C): LDP (Label Distribution Protocol) enables automatic discovery and
signaling of virtual circuits for VPLS. While LDP tunnels can use control bits, control bit 0 indicates
that the tunnel can only support the standard mode of operation, reinforcing the correct
interpretation of LDP's limitations.
Evaluation of Incorrect Options:
Option B: LDP-signaled VPLS tunnels do not exclusively support control bit 0. They can also leverage
additional control bits for various functionalities, contrary to the assertion in this option. Thus, it misidentifies
the operational capabilities of LDP.
Option D: The claim that BGP-signaled VPLS can use either RSVP or LDP is misleading. While BGP can
facilitate the establishment of VPLS, it primarily does not rely on either RSVP or LDP for signaling. Instead,
RSVP is generally used for traffic engineering rather than VPLS configuration, as VPLS relies on its signaling
mechanism that does not include RSVP as a fundamental component.
References:
https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/vpls-cli.html
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_vpls/configuration/15-m/s-vpls-cg-15-m/cg_vpls.html
https://www.routereflector.com/2016/11/01/vpls-the-basics/
Referring to the exhibit, which two statements are true? (Choose two.)
A
The devices advertising this route into EVPN are 10.0.2.12 and 10.0.2.22.
B
This route is learned through EBGP.
C
. The device advertising this route into EVPN is 192.168.101.5.
D
This is an EVPN Type-2 route.
Correct Answer:
C. . The device advertising this route into EVPN is 192.168.101.5.
You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based
MPLS network using BGP. You have already configured mpls ipv6-tunneling on your PE routers.
Which two statements are correct about the BGP configuration in this scenario? (Choose two.)
A
You must configure family inet6 labeled-unicast between PE routers.
B
You must configure family inet6 add-path between PE and CE routers.
C
You must configure family inet6 unicast between PE and CE routers.
D
You must configure family inet6 unicast between PE routers.
Correct Answer:
A. You must configure family inet6 labeled-unicast between PE routers.
When using 0SPFv3 for an IPv4 environment, which statement is correct?
A
OSPFv3 only supports IPv4.
B
OSPFv3 is not backward compatible with IPv4.
C
OSPFv3 supports both IPv6 and IPv4, but not in the same routing instance.
D
OSPFv3 supports IPv4 only on interfaces with family inet6 defined.
Correct Answer:
D. OSPFv3 supports IPv4 only on interfaces with family inet6 defined.
Explanation:
D is correct because OSPFv3 is designed primarily for IPv6 but can be configured to support IPv4 through the
OSPFv3, originally developed for IPv6, utilizes the concept of a link-state routing protocol and has been
adapted to support IPv4 networks only under specific interface configurations utilizing the family inet6. This
configuration allows OSPFv3 to encapsulate IPv4 routing information while maintaining its inherent IPv6
architecture. Thus, enabling IPv4 over OSPFv3 necessitates that interfaces are explicitly defined to handle
both address families, while keeping them within separate routing instances.
Evaluation of Incorrect Options:
A. OSPFv3 only supports IPv4.
This statement is incorrect as OSPFv3 primarily targets IPv6. While it can support IPv4, it does so under the
constraints of its IPv6 framework, demonstrating a restriction rather than a blanket support statement.
B. OSPFv3 is not backward compatible with IPv4.
This is misleading; OSPFv3 can run alongside OSPFv2 (the IPv4 dedicated version). However, OSPFv3 itself is
not directly backward compatible in the traditional sense because it operates under a different protocol
version tailored for IPv6.
C. OSPFv3 supports both IPv6 and IPv4 but not in the same routing instance.
References:
IPv4.html
This statement is partially correct; however, it fails to emphasize that IPv4 support through OSPFv3
necessitates specific interface settings. The separation of routing instances does occur, but OSPFv3's
handling of IPv4 is not an inherent feature without the proper configuration.
https://www.juniper.net/documentation/en_US/junos/topics/concept/ospf-v3-overview.html
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/224726-OSPFv3-and-
https://www.networkworld.com/article/2250170/ipv4-routing-with-ospf.html
You are a network architect for a service provider and want to offer Layer 2 services to your customers. You want
to use EVPN for Layer 2 services in your existing MPLS network.
Which two statements are correct in this scenario? (Choose two.)
A
Segment routing must be configured on all PE routers.
B
EVPN uses Type 2 routes to advertise MAC address and IP address pairs learned using ARP snooping.
C
EVPN uses Type 3 routes to join a multicast tree to flood traffic.
D
VXLAN must be configured on all PE routers.
Correct Answer:
B. EVPN uses Type 2 routes to advertise MAC address and IP address pairs learned using ARP snooping.
Explanation:
BC is correct as EVPN utilizes Type 2 routes for MAC/IP advertisement and Type 3 routes for multicast traffic
management.
Reasoning for Correct Answers:
1. Type 2 Routes: EVPN leverages Type 2 routes to advertise MAC address and IP address pairs, which
are crucial for ensuring that Layer 2 services work efficiently over an MPLS network. ARP snooping
facilitates the learning of these pairs, allowing for optimal forwarding and reachability.
2. Type 3 Routes: Type 3 routes in EVPN are employed to establish and manage multicast distribution
trees. They allow for effective flooding of traffic within the EVPN instance, ensuring that multicast
traffic is distributed without overwhelming the entire network infrastructure.
Evaluation of Incorrect Options:
A. Segment Routing Requirement: The statement that segment routing must be configured on all PE routers
is incorrect. While segment routing can enhance EVPN implementations, its configuration is not a prerequisite
for deploying EVPN itself. EVPN can be operational on a traditional MPLS backbone without necessitating
segment routing.
D. VXLAN Necessity: The assertion that VXLAN must be configured on all PE routers is also incorrect. While
VXLAN is a common encapsulation method utilized with EVPN for extending Layer 2 connectivity across Layer
3 networks, it is not a mandatory requirement. EVPN can function without VXLAN, depending on the
operational scenario and design considerations of the service provider.
References:
https://www.juniper.net/documentation/en_US/junose/topics/concept/evpn-overview.html
https://www.juniper.net/documentation/en_US/junose/topics/reference/configuration-statement/evpn-
parameters.html
https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/evpn/evpn-overview/b-evpn-ov.html
You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target: 65100:100
statement in your routing instance.
In this scenario, which two statements describe the vrf-target configuration? (Choose two.)
A
This value is used to identify BGP routes learned from the remote PE device.
B
This value is used to add a target community to BGP routes advertised to the local CE device.
C
. This value is used to add a target community to BGP routes advertised to the remote PE device.
D
This value is used to identify BGP routes learned from the local CE device.
Correct Answer:
A. This value is used to identify BGP routes learned from the remote PE device.
Explanation:
AC is correct because the vrf-target configuration facilitates the identification of BGP routes among VPNs
and supports the propagation of these routes across different provider edge devices.
Reasoning:
Evaluation of Incorrect Options:
1. Identification of BGP Routes: The vrf-target statement target: 65100:100 in a Layer 3 VPN context
defines a route target that enables the identification of BGP routes learned from remote Provider
Edge (PE) devices. This plays a crucial role in VRF (Virtual Routing and Forwarding) instances by
ensuring that routes are correctly associated and identifiable across different VRFs within a multi-
tenant environment.
2. Route Advertisement to Local CE: The target community is also essential when advertising routes
from the local PE to the Customer Edge (CE) device. It facilitates the automation of route
redistribution processes and ensures that the correct routes are utilized.
Option B (This value is used to add a target community to BGP routes advertised to the local CE device):
Incorrect. This statement misrepresents the use of vrf-target as it does not add a target community; instead, it
primarily identifies and categorizes the routes exchanged between PE devices.
Option D (This value is used to identify BGP routes learned from the local CE device): Incorrect. The vrf-target
specifically pertains to the identification of routes learned from remote PE devices. The local CE device routes
are managed differently, typically falling under the local routing instance without direct association to the
vrf-target settings.
References:
https://www.juniper.net/documentation/en_US/junos/topics/concept/service-provider-routing-switching-
architecture.html
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_vpn_config/command/ivr-vpn-mpl.html
https://www.ietf.org/rfc/rfc4364.txt
Questions: 1-10 out of 96
Continue Full Practice..
GET ALL 96 QUESTIONS