10 free Juniper JN0-664 JNCIP-SP practice questions with the correct answer and a full explanation for each, taken from the CertStash pack of 96 questions. Work through them, then open each answer to check your reasoning.
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Question 1
Click the Exhibit button.
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?
Show answer and explanation
Correct answer: C. Configure the multipath multiple-as parameter under the global BGP configuration.
R2 is receiving the route 11.11.11.0/24 from two different AS paths: AS 65001 (via R1) and AS 65003 (via R3). By default, BGP does not load balance across routes from different autonomous systems. The multipath multiple-as parameter enables BGP to install multiple routes in the routing table even when they come from different AS paths, allowing R2 to load balance traffic across both R1 and R3 for the destination 11.11.11.0/24.
Why the other options are wrong
- A. The multipath parameter without multiple-as restriction only allows load balancing for routes received from the same AS, which does not apply here since the routes are from different ASes (65001 and 65003).
- B. Applying the prepend policy as an import policy under R1 would increase the AS path length for routes from R1, making them less preferred and preventing load balancing rather than enabling it.
- D. Applying the prepend policy as an import policy under R3 would increase the AS path length for routes from R3, making them less preferred and preventing load balancing rather than enabling it.
Question 2
Click the Exhibit button.
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.)
Show answer and explanation
Correct answer: A, C, D
A. Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops. 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. To enable BGP load balancing across multiple paths from R1 to the destination 203.0.113.128/25, three configuration steps are necessary. First, the multipath option must be enabled under protocols bgp on R1 itself (option D) to allow the router to install and use multiple BGP routes with equal cost. Second, the routing table on R1 must be verified to contain BGP routes for 203.0.113.128/25 with multiple next hops (option A), confirming that multiple equal-cost paths are actually being installed. Third, a load balancing export policy under routing-options (option C) ensures that traffic is distributed across these multiple paths for outbound traffic forwarding. These three actions work together: multipath enables the feature on R1, the routing table verification confirms multiple paths exist, and the export policy ensures proper load distribution.
Why the other options are wrong
- B. The multipath option on R2 and R3 is not required for R1 to perform load balancing; this option affects only those upstream routers, not R1's forwarding behavior.
- E. An import policy under protocols bgp would filter or modify incoming routes but does not enable load balancing; the load balancing distribution is controlled by export policies and the multipath feature, not import policies.
Question 3
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.)
Show answer and explanation
Correct answer: A, C, E
A. set protocols ospf3 realm ipv4-unicast overload timeout 900 C. set protocols ospf overload timeout 900 E. set protocols ospf3 overload timeout 900 After a device reboots, the overload statement prevents the router from being used for transit traffic until it has fully converged, reducing suboptimal routing. Options A, C, and E configure overload with timeout values for both OSPFv3 realm ipv4-unicast and standard OSPF, allowing the router to gracefully exit overload mode after convergence completes. Option B enables overload without a timeout, which would persist indefinitely and is not the recommended approach for post-reboot scenarios where automatic recovery is desired.
Why the other options are wrong
- B. Missing timeout value means overload persists indefinitely rather than automatically recovering after convergence.
- D. OSPFv3 overload without timeout does not provide automatic timeout-based recovery like options A and E do.
Question 4
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.)
Show answer and explanation
Correct answer: A, B
A. Configure MSDP on each RP router. B. Configure anycast PIM with the rp-set statement on each RP router. To share active sources between RPs in PIM-SM with anycast RP, two solutions are needed: MSDP (Multicast Source Discovery Protocol) configured on each RP router allows RPs to exchange learned source information, enabling load balancing of active sources; and anycast PIM with the rp-set statement on each RP router defines the shared anycast address for the RP group. Options C and D are incorrect because source DR routers do not configure RP settings, and MSDP on source DRs would not accomplish the RP-to-RP source sharing objective.
Why the other options are wrong
- C. Source DR routers do not configure RP settings; only RP routers define the rp-set.
- D. MSDP belongs on RP routers to share source information between RPs, not on source DR routers.
Question 5
Which two statements are correct about VPLS tunnels? (Choose two.)
Show answer and explanation
Correct answer: C, D
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. LDP-signaled VPLS tunnels use auto-discovery mechanisms to automatically provision sites without manual configuration, and they support control bit 0 for signaling. BG-ignaled VPLS tunnels can employ either RSVP or LDP as the underlying tunnel technology between PE routers for data plane transport. Option A is incorrect because BGP-signaled VPLS uses auto-discovery and does not require manual site provisioning. Option B is incorrect because LDP-signaled VPLS tunnels are not limited to control bit 0.
Why the other options are wrong
- A. BGP-signaled VPLS uses auto-discovery; manual provisioning is not required.
- B. LDP-signaled VPLS tunnels support multiple control bits, not only control bit 0.
Question 6
Click the Exhibit button.
Referring to the exhibit, which two statements are true? (Choose two.)
Show answer and explanation
Correct answer: B, C
B. This route is learned through EBGP. C. The device advertising this route into EVPN is 192.168.101.5. The output shows this route is learned through BGP with a preference of 170/-101, which indicates IBGP (Internal BGP), not EBGP. However, examining the detailed path information, it shows 'Local AS: 65101 Peer AS: 65101' confirming IBGP. The route is advertised by 192.168.101.5, as shown in the 'Originator ID: 192.168.101.5' field and the originating router information. The two next-hop addresses listed at the bottom (10.0.2.12 via et-0/0/0.0 and 10.0.2.22 via et-0/0/1.0) are indirect forwarding next hops for the path, not the devices advertising the route into EVPN. The device advertising this route is the originator at 192.168.101.5.
Why the other options are wrong
- A. While 10.0.2.12 and 10.0.2.22 appear as indirect forwarding next hops for traffic, they are not the devices advertising this route into EVPN; they are merely next-hop addresses used for forwarding.
Question 7
Click the Exhibit button.
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.)
Show answer and explanation
Correct answer: A, C
A. You must configure family inet6 labeled-unicast between PE routers. C. You must configure family inet6 unicast between PE and CE routers. In this scenario, the service provider must transport customer IPv6 traffic across an IPv4 MPLS network. With mpls ipv6-tunneling already configured on PE routers, two BGP address families are required: (A) family inet6 labeled-unicast must be configured between PE routers to enable the exchange of IPv6 routes with MPLS labels across the service provider backbone, allowing the MPLS tunneling to function properly; (C) family inet6 unicast must be configured between PE and CE routers to allow the customer's IPv6 routes to be advertised and received at the customer-provider interface. These two configurations work together, unicast between PE-CE for customer route exchange, and labeled-unicast between PE-PE for label distribution across the MPLS core.
Why the other options are wrong
- B. add-path is used for advertising multiple paths for the same prefix and is not required for basic IPv6 transport over MPLS in this topology.
- D. BGP family inet6 unicast between PE routers is unnecessary; labeled-unicast (not unicast) is needed between PE routers to carry labels, while unicast is only needed at the PE-CE boundary.
Question 8
When using 0SPFv3 for an IPv4 environment, which statement is correct?
Show answer and explanation
Correct answer: D. OSPFv3 supports IPv4 only on interfaces with family inet6 defined.
OSPFv3 supports IPv4 when interfaces are configured with the family inet6 address family, which is the mechanism that enables OSPFv3 to operate in IPv4 environments. This allows OSPFv3 to function for both IPv4 and IPv6 routing in the same instance through separate address family configurations. Options A and B are factually incorrect as OSPFv3 does support IPv4. Option C is misleading because OSPFv3 can support both IPv4 and IPv6 in the same routing instance when properly configured with appropriate address families.
Why the other options are wrong
- A. OSPFv3 supports both IPv6 and IPv4, not only IPv6.
- B. OSPFv3 is backward compatible with IPv4 when properly configured.
- C. OSPFv3 can support both IPv4 and IPv6 in the same routing instance through address family configuration.
Question 9
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.)
Show answer and explanation
Correct answer: B, C
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. EVPN Type 2 routes advertise MAC address and IP address pairs learned through ARP snooping, enabling efficient MAC learning and ARP handling. EVPN Type 3 routes are used to join multicast trees for BUM (Broadcast, Unknown unicast, Multicast) traffic flooding in the EVPN domain. Options A and D are incorrect because segment routing is an optional optimization and not required for EVPN deployment, and VXLAN is an alternative encapsulation mechanism but not mandatory when using MPLS in the existing network.
Why the other options are wrong
- A. Segment routing is optional for EVPN and not required on all PE routers.
- D. VXLAN is an alternative to MPLS encapsulation; it is not required when MPLS is already deployed.
Question 10
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.)
Show answer and explanation
Correct answer: A, C
A. This value is used to identify BGP routes learned from the remote PE device. C. This value is used to add a target community to BGP routes advertised to the remote PE device. The vrf-target configuration adds a target community to BGP routes advertised to the remote PE device, enabling route distribution across the provider backbone. This same target value is used to identify and filter BGP routes learned from the remote PE device, ensuring only routes with matching targets are imported into the local VRF. Options B and D are incorrect because vrf-target applies to PE-to-PE route exchange, not to routes advertised to or learned from the local CE device.
Why the other options are wrong
- B. The vrf-target does not add communities to routes sent to the local CE; it controls PE-to-PE route distribution.
- D. Routes learned from the local CE are not identified by vrf-target; they are sourced locally in the VRF.
That was 10 of 96.
The full Juniper JN0-664 JNCIP-SP pack has all 96 questions, each with the answer, the explanation and why the other options are wrong, plus a questions-only copy for timed runs. US$39, paid once, with free monthly updates and a pass-or-your-money-back guarantee.