THREE HIGH-IN-DEMAND TEST4SURE JUNIPER JN0-664 PRACTICE QUESTIONS FORMATS

Three High-in-Demand Test4Sure Juniper JN0-664 Practice Questions Formats

Three High-in-Demand Test4Sure Juniper JN0-664 Practice Questions Formats

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

NEW QUESTION # 93
Exhibit

Click the Exhibit button-Referring to the exhibit, which two statements are correct about BGP routes on R3 that are learned from the ISP-A neighbor? (Choose two.)

  • A. All BGP attribute values must be removed before receiving the routes.
  • B. By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3.
  • C. The next-hop value for these routes is changed by ISP-A before being sent to R3.
  • D. The BGP local-preference value that is used by ISP-A is not advertised to R3.

Answer: C,D

Explanation:
Analyzing the Exhibit
* The diagram represents BGP peering between:
* AS 65512 (Enterprise Network)
* AS 65511 (ISP-A)
* R3 and R4 are peering with ISP-A using EBGP.
* R1, R2, R3, and R4 are peering within AS 65512 using IBGP.
Understanding BGP Route Behavior
Option A: "By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3." #
* Incorrect!
* EBGP behavior: When a BGP route is advertised via EBGP, the next-hop IP is changed to the router's own IP by default.
* Since ISP-A is advertising routes via EBGP to R3, the next-hop is changed to ISP-A's IP.
* Thus, this statement is incorrect.
Option B: "The BGP local-preference value that is used by ISP-A is not advertised to R3." #
* Correct!
* BGP Local Preference (LOCAL_PREF) is an IBGP-only attribute.
* Local Preference is NOT shared over EBGP because it is used within an AS to influence route selection.
* ISP-A will not send LOCAL_PREF to R3, as R3 is in a different AS.
* Thus, this statement is correct.
Option C: "All BGP attribute values must be removed before receiving the routes." #
* Incorrect!
* BGP does not remove all attributes when advertising routes. Some attributes are modified (e.g., next- hop, AS-PATH), but others (like MED, community) may be preserved.
* Thus, this statement is incorrect.
Option D: "The next-hop value for these routes is changed by ISP-A before being sent to R3." #
* Correct!
* As per default EBGP behavior, the next-hop is changed when a route is advertised to an EBGP peer.
* This means ISP-A changes the next-hop to its own IP before sending it to R3.
* Thus, this statement is correct.
# B. The BGP local-preference value that is used by ISP-A is not advertised to R3.
# D. The next-hop value for these routes is changed by ISP-A before being sent to R3.
Verification from Juniper Documentation:
* Juniper BGP Configuration Guide confirms that LOCAL_PREF is not advertised over EBGP.
* RFC 4271 (BGP-4) specifies that next-hop is changed by default when advertising routes via EBGP
.


NEW QUESTION # 94
Exhibit

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. Apply the prepend policy as an import policy under group R1.
  • B. Configure the multipath parameter under the global BGP configuration.
  • C. Configure the multipath multiple-as parameter under the global BGP configuration.
  • D. Apply the prepend policy as an import policy under group R3.

Answer: C


NEW QUESTION # 95
Which two statements are correct regarding the PIM DR in a PIM-SM domain? (Choose two.)

  • A. By default, PIM DR election is performed on point-to-point links.
  • B. The source DR sends PIM register messages from the source network to the RP.
  • C. If the DR priorities match, the router with the lowest IP address is selected as the DR.
  • D. The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.

Answer: B,D

Explanation:
In PIM-SM (Protocol Independent Multicast - Sparse Mode), the Designated Router (DR) plays a crucial role in multicast forwarding. The DR is responsible for various tasks depending on whether it is connected to the source or the receiver. Let's analyze each statement regarding the PIM DR in a PIM-SM domain.
1. **Statement A: The source DR sends PIM register messages from the source network to the RP.**
- Correct. In PIM-SM, the DR on the source's local network is responsible for encapsulating multicast packets in PIM Register messages and sending them to the Rendezvous Point (RP). This process ensures that the RP is aware of active sources.
2. **Statement B: If the DR priorities match, the router with the lowest IP address is selected as the DR.**
- Incorrect. The correct rule is that if the DR priorities match, the router with the **highest** IP address is selected as the DR. The election process first compares priorities; if priorities are equal, the IP addresses are compared to select the DR.
3. **Statement C: The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.**
- Correct. In PIM-SM, the DR on the receiver's local network sends PIM Join messages toward the RP to join the multicast distribution tree. Similarly, it sends PIM Prune messages to leave the tree when there are no interested receivers.
4. **Statement D: By default, PIM DR election is performed on point-to-point links.**
- Incorrect. By default, PIM DR election is performed on multi-access networks (e.g., Ethernet). On point-to-point links, there is no need for a DR election as there are only two routers involved.
**Conclusion**:
The correct statements regarding the PIM DR in a PIM-SM domain are:
**A. The source DR sends PIM register messages from the source network to the RP.**
**C. The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.**
**Reference**:
- Juniper Networks Documentation on PIM-SM: [PIM-SM Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/pim-sparse-mode-overview.html)
- RFC 7761, Protocol Independent Multicast - Sparse Mode (PIM-SM): [RFC 7761](https://tools.ietf.org/html/rfc7761) which details the PIM-SM protocol, including DR roles and election procedures.


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 without receivers must periodically prune themselves from the SPT.
  • C. Routers with receivers send join messages to their upstream neighbors.
  • D. Traffic is only forwarded to routers that request to join the distribution tree.

Answer: C,D

Explanation:
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 hutton.
You are configuring an interprovider Option C Layer 3 VPN to connect two customer sites.
Referring to the exhibit, which three statements are correct? (Choose three.)

  • A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.
  • B. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
  • C. P routers only maintain the internal routes from their own AS.
  • D. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.
  • E. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.

Answer: A,C,D

Explanation:
Interprovider Option C for Layer 3 VPNs involves the use of Autonomous System Boundary Routers (ASBRs) to exchange labeled VPN-IPv4 routes between different Autonomous Systems (AS). This option requires BGP sessions between ASBRs, and the VPN routes are carried end-to-end using MPLS labels. Here' s a detailed analysis of the roles of different routers in this scenario:
1. **ASBR Routers**:
- ASBRs are responsible for exchanging VPN-IPv4 routes between different ASes.
- **A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
- Correct. ASBRs maintain routes to internal destinations within their own AS, and they also need to know the loopback addresses of PEs in the other AS to set up the BGP sessions and MPLS tunnels.
2. **PE Routers**:
- PE routers are responsible for maintaining VPN routes and label information to forward VPN traffic correctly.
- **B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Correct. PE routers need to maintain:
- Internal routes within their AS for routing.
- Loopback addresses of other AS PEs for establishing MPLS LSPs.
- L3VPN routes to provide end-to-end VPN connectivity.
3. **P Routers**:
- P routers are the core routers that do not participate in BGP VPN routing but forward labeled packets based on MPLS labels.
- **C. P routers only maintain the internal routes from their own AS.**
- Correct. P routers maintain the internal routing information to forward packets within the AS and use MPLS labels for forwarding VPN packets. They do not maintain VPN routes or routes from other ASes.
4. **Incorrect Statements**:
- **D. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
**
- Incorrect. P routers do not need to maintain the loopback addresses of other AS PEs. They only maintain internal routing and MPLS label information.
- **E. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Incorrect. ASBR routers do not maintain L3VPN routes. They exchange labeled VPN-IPv4 routes with other ASBRs and forward them to PE routers.
**Conclusion**:
The correct answers are:
**A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
**B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
**C. P routers only maintain the internal routes from their own AS.**
**References**:
- Juniper Networks Documentation on Interprovider VPNs: [Interprovider VPN Configuration](https://www.
juniper.net/documentation/en_US/junos/topics/topic-map/mpls-vpn-interprovider.html)
- MPLS and VPN Architectures, CCIP Edition by Ivan Pepelnjak and Jim Guichard


NEW QUESTION # 98
......

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