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Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) certification exam is designed to validate the knowledge and skills of network professionals working in service provider environments. Service Provider, Professional (JNCIP-SP) certification is intended for individuals who have experience in configuring and troubleshooting Juniper Networks products and solutions in service provider networks. The JNCIP-SP certification helps professionals to demonstrate their expertise in designing, implementing, and managing Juniper-based service provider networks.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q93-Q98):

NEW QUESTION # 93
Exhibit

Referring to the exhibit, PE-1 and PE-2 are getting route updates for VPN-B when neither of them service that VPN Which two actions would optimize this process? (Choose two.)

A. Configure the family route-target statement on the PEs.
B. Configure the family route-target statement on the RR.
C. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the RR.
D. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the PEs.

Answer: B,C

Explanation:
BGP route target filtering can be configured on PE devices or on route reflectors (RRs). Configuring BGP route target filtering on RRs is more efficient and scalable, as it reduces the number of BGP sessions and updates between PE devices. To configure BGP route target filtering on RRs, the following steps are required:
Configure the family route-target statement under the BGP group or neighbor configuration on the RRs. This enables the exchange of the route-target address family between the RRs and their clients (PE devices).
Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement under the routing-options configuration on the RRs. This enables the RRs to resolve next hops for VPN routes using the inet.0 routing table.

NEW QUESTION # 94
Which origin code is preferred by BGP?

A. External
B. Null
C. Internal
D. Incomplete

Answer: C

Explanation:
Prefer the route with the lower origin code.
Routes learned from an IGP have a lower origin code than those learned from an exterior gateway protocol (EGP), and both have lower origin codes than incomplete routes (routes whose origin is unknown).
https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/bgp/topics/concept/routing- protocols-address-representation.html

NEW QUESTION # 95

Click the Exhibit button.
Referring to the exhibit, which two statements are correct about BGP routes on R3 that are advertised to R1?
(Choose two.)

A. By default, all BGP attributes values must be removed before advertising the routes to R1.
B. By default, the next-hop value for these routes is not changed by R3 before being sent to R1.
C. By default, the next-hop value for these routes is changed by R3 before being sent to R1.
D. By default, the BGP local-preference value that is assigned on R3 is advertised to R1.

Answer: B,D

Explanation:
In the exhibit, we see an internal BGP (iBGP) setup within AS 65512, and an external BGP (eBGP) connection between R3 and ISP-A (AS 65511). The questions focus on the behavior of BGP routes advertised from R3 to R1 within the same AS.
1. **BGP Next-Hop Attribute (Option A and D)**:
- In iBGP, the next-hop attribute is **not** changed when a route is advertised to another iBGP peer. This means that when R3 advertises a route to R1, it retains the original next-hop value as learned from the eBGP peer (ISP-A).
- Therefore, Option D is correct: "By default, the next-hop value for these routes is not changed by R3 before being sent to R1."
2. **BGP Attributes (Option B and C)**:
- BGP attributes such as local preference, AS-path, and others are crucial for BGP route selection. The local preference attribute is used within an AS to indicate the preferred path for outbound traffic.
- When R3 advertises BGP routes to R1, it includes the local preference value assigned to those routes. This value is not removed and is propagated within the iBGP mesh.
- Therefore, Option C is correct: "By default, the BGP local-preference value that is assigned on R3 is advertised to R1."
**References**:
- Juniper Networks documentation on BGP behavior provides detailed insights into the propagation of BGP attributes within iBGP and eBGP contexts. Specifically, the Junos OS documentation covers the default behavior of next-hop and local preference attributes in BGP configurations.
- Junos OS BGP Configuration Guide: [Junos OS BGP Configuration Guide](https://www.juniper.net
/documentation/en_US/junos/topics/concept/bgp-overview.html)
- For a deeper understanding of BGP attributes and their default behaviors, the "Juniper Networks Day One:
Exploring BGP" book is an excellent resource.

NEW QUESTION # 96
Which two statements describe PIM-SM? (Choose two)

A. Traffic is initially flooded to all routers and an S,G is maintained for each group
B. Routers with receivers send join messages to their upstream neighbors.
C. Routers without receivers must periodically prune themselves from the SPT.
D. Traffic is only forwarded to routers that request to join the distribution tree.

Answer: B,D

Explanation:
PIM sparse mode (PIM-SM) is a multicast routing protocol that uses a pull model to deliver multicast traffic.
In PIM-SM, routers with receivers send join messages to their upstream neighbors toward a rendezvous point (RP) or a source-specific tree (SPT). The RP or SPT acts as the root of a shared distribution tree for a multicast group. Traffic is only forwarded to routers that request to join the distribution tree by sending join messages.
PIM-SM does not flood traffic to all routers or prune routers without receivers, as PIM dense mode does.

NEW QUESTION # 97

Click the Exhibit button.
You have an EVI implemented between PE-1, PE-2, and PE-3 to allow communication between CE-1 and CE-2. CE-2 receives unicast traffic from CE-1 on both links to PE-2 and PE-3. When CE-1 sends broadcast traffic, CE-2 receives it on only one of the multihomed links.
Referring to the exhibit, which EVPN route type enables this behavior?

A. Type 3
B. Type 4
C. Type 1
D. Type 2

Answer: A

Explanation:
In the context of Ethernet VPN (EVPN) and the behavior described in the exhibit, it's essential to understand the different EVPN route types and their specific functionalities. Here, CE-2 is receiving unicast traffic on both of its multihomed links to PE-2 and PE-3, but broadcast traffic is received only on one of these links.
**Explanation of EVPN Route Types**:
1. **Type 1 (Ethernet Auto-Discovery Routes)**:
- These routes are used for auto-discovery of Ethernet segments and for advertising VLAN membership.
- They do not directly influence the behavior described in the question.
2. **Type 2 (MAC/IP Advertisement Routes)**:
- These routes are used to advertise MAC addresses and IP-to-MAC bindings within the EVPN.
- They handle unicast traffic forwarding and are crucial for populating the MAC address tables on the PE devices.
- While important, they do not explain the selective broadcast behavior.
3. **Type 3 (Inclusive Multicast Ethernet Tag Routes)**:
- These routes are used to build multicast distribution trees for delivering broadcast, unknown unicast, and multicast (BUM) traffic.
- They ensure that BUM traffic is sent only once per Ethernet segment, preventing duplicate frames from being sent to multihomed CEs.
- This aligns with the behavior described where CE-2 receives broadcast traffic on only one link to prevent duplication.
4. **Type 4 (Ethernet Segment Routes)**:
- These routes are used to advertise the presence of an Ethernet segment and are crucial for Designated Forwarder (DF) election processes in multihoming scenarios.
- While relevant to multihoming, they are not directly responsible for the selective broadcast behavior.
**Conclusion**:
The behavior described, where CE-2 receives broadcast traffic on only one of its multihomed links, is controlled by Type 3 routes. These routes are specifically designed to handle inclusive multicast and broadcast traffic efficiently in EVPN environments, ensuring that such traffic is not duplicated across multiple links to the same CE.
**References**:
- Juniper Networks EVPN Documentation: [EVPN
Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-overview.html)
- RFC 7432, BGP MPLS-Based Ethernet VPN: [RFC 7432](https://tools.ietf.org/html/rfc7432) provides detailed descriptions of EVPN route types and their functions.
- Junos OS EVPN Configuration Guide: [Junos OS EVPN Configuration
Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/evpn.html)

NEW QUESTION # 98
......

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