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Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Certification Exam is a professional-level certification exam that is designed for network engineers, administrators, and technicians who work in service provider environments. Service Provider, Professional (JNCIP-SP) certification exam is intended to test the knowledge, skills, and abilities of candidates who want to demonstrate their expertise in Juniper Networks service provider routing and switching technologies.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q89-Q94):

NEW QUESTION # 89
You are configuring schedulers to define the class-of-service properties of output queues. You want to control packet drops during periods of congestion.
In this scenario, which CoS configuration parameter would be used to accomplish this task?

A. priority
B. shaping rate
C. buffer size
D. drop profile

Answer: D

Explanation:
When configuring Class of Service (CoS) properties for output queues, we need to manage packet drops during periods of congestion. Juniper's CoS framework provides several tools to manage congestion, including drop profiles, buffer sizes, and scheduling mechanisms. Let's break down each option and identify the correct one.
Evaluating the Answer Choices
# D. drop profile (Correct Answer)
* Why?
* A drop profile defines when packets should be dropped based on the queue fill level.
* Random Early Detection (RED) or Tail Drop can be used to manage congestion by discarding lower-priority packets first.
* Drop profiles are configured under the scheduler to determine how aggressive packet dropping should be during congestion.
* Example Juniper Configuration:
schedulers {
best-effort {
drop-profile low-drop;
}
}
drop-profiles {
low-drop {
fill-level 80 drop-probability 50;
}
}
* fill-level 80 # When the queue reaches 80% full, packet drops begin.
* drop-probability 50 # There is a 50% chance of dropping packets once the threshold is reached.
# Official Juniper Documentation Reference:
# Junos Class of Service Configuration Guide
"A drop profile determines how packets are discarded based on the queue fill level, allowing control over congestion behavior." Why the Other Options Are Incorrect?
# A. buffer size (Incorrect)
* Why?
* The buffer size determines how many packets the queue can store before congestion occurs.
* A larger buffer can delay drops, but it does not actively control dropping behavior.
* It affects latency rather than controlling packet drops.
# B. priority (Incorrect)
* Why?
* Priority controls which queue gets serviced first, not how drops are handled.
* Higher priority queues are serviced before lower-priority queues, but this does not prevent congestion-related drops.
# C. shaping rate (Incorrect)
* Why?
* Shaping limits the maximum transmission rate of the queue.
* While shaping helps reduce congestion, it does not control which packets get dropped during congestion.
* Shaping is useful for traffic smoothing, but it does not actively drop packets based on queue fill levels.
# D. drop profile
* Controls packet drops based on queue congestion.
* Defines RED (Random Early Detection) or Tail Drop mechanisms.
* Directly influences drop probability as the queue fills up.
# Official Juniper Reference:
"Drop profiles are used to manage congestion by determining when and how aggressively packets are dropped based on queue fill level."

NEW QUESTION # 90
Exhibit

Referring to the exhibit, you must provide Internet access for VPN-A using CE-1 as the hub CE.
Which two statements are correct in this situation? (Choose two.)

A. RIB groups are not needed to leak routes between the inet. 0 and VPN-A. inet. 0 tables,
B. You must use RIB groups to leak routes between the inet. o and vpn-a. inet. o tables.
C. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> GW-1.
D. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1.

Answer: B,D

Explanation:
To provide Internet access for VPN-A using CE-1 as the hub CE, you need to do the following:
You must use RIB groups to leak routes between the inet.0 and vpn-a.inet.0 tables on PE-1 and CE-1.
RIB groups are routing options that allow you to import routes from one routing table into another routing table based on certain criteria. In this scenario, you need to configure RIB groups on PE-1 and CE-1 to import Internet routes from inet.0 into vpn-a.inet.0 and vice versa.
Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1. This is because Site 2 does not have direct Internet access and needs to use CE-1 as its default gateway for Internet traffic. Site 2 sends its Internet traffic to PE-2, which forwards it to PE-1 based on VPN-A routes. PE-1 then sends it to CE-1 based on RIB group import policy. CE-1 then sends it back to PE-1 based on its default route pointing to GW-1. PE-1 then forwards it to GW-1 based on RIB group import policy again.

NEW QUESTION # 91
Which three statements about IS-IS in a multi-area network are correct? (Choose three.)

A. Internal L1 PDUs are flooded to all L1 routers in other areas.
B. External L2 PDUs are only flooded to the local area's L2 routers.
C. External L2 PDUs are flooded to all L2 routers in other areas.
D. Internal L1 PDUs are flooded to the local area's L2 routers.
E. Internal L1 PDUs are only flooded to the local area's L1 routers.

Answer: C,D,E

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It operates in two levels, Level 1 (L1) and Level 2 (L2), and supports hierarchical routing within a multi-area network.
Let's analyze each statement to determine its correctness in the context of IS-IS multi-area networks.
1. **Statement A: Internal L1 PDUs are flooded to the local area's L2 routers.**
- This statement is correct. L1 PDUs (Protocol Data Units) are flooded within the L1 area and also to the L2 routers that are present in the same area. These L2 routers act as the boundary routers that connect the local L1 area to other L1 areas via L2.
2. **Statement B: External L2 PDUs are flooded to all L2 routers in other areas.**
- This statement is correct. L2 PDUs are flooded throughout the entire L2 backbone, which includes all L2 routers in different areas. This ensures that inter-area routing information is shared across the network.
3. **Statement C: Internal L1 PDUs are flooded to all L1 routers in other areas.**
- This statement is incorrect. Internal L1 PDUs are only flooded within the local L1 area. They do not cross L1 area boundaries; inter-area communication is handled by L2 routers.
4. **Statement D: Internal L1 PDUs are only flooded to the local area's L1 routers.**
- This statement is correct. Internal L1 PDUs are indeed only flooded within their local L1 area, and do not go beyond it.
5. **Statement E: External L2 PDUs are only flooded to the local area's L2 routers.**
- This statement is incorrect. External L2 PDUs are flooded to all L2 routers throughout the IS-IS network, not just to those in the local area. This allows L2 routers to maintain a complete map of the network's topology.
**Conclusion**:
Given the analysis, the correct answers are:
**A. Internal L1 PDUs are flooded to the local area's L2 routers.**
**B. External L2 PDUs are flooded to all L2 routers in other areas.**
**D. Internal L1 PDUs are only flooded to the local area's L1 routers.**
**Reference**:
- Juniper Networks Documentation on IS-IS: [IS-IS Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/is-is-routing-overview.html)
- RFC 1195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments: [RFC 1195](https://tools.ietf.org/html/rfc1195) which details the operation of IS-IS in multi-area networks.

NEW QUESTION # 92
Exhibit

Which two statements about the output shown in the exhibit are correct? (Choose two.)

A. The connection has not flapped since it was initiated.
B. The PE is attached to a single local site.
C. There has been a VLAN ID mismatch.
D. The PE router has the capability to pop flow labels

Answer: B,D

Explanation:
According to 1 and 2, BGP Layer 2 VPNs use BGP to distribute endpoint provisioning information and set up pseudowires between PE devices. BGP uses the Layer 2 VPN (L2VPN) Routing Information Base (RIB) to store endpoint provisioning information, which is updated each time any Layer 2 virtual forwarding instance (VFI) is configured. The prefix and path information is stored in the L2VPN database, which allows BGP to make decisions about the best path.
In the output shown in the exhibit, we can see some information about the L2VPN RIB and the pseudowire state. Based on this information, we can infer the following statements:
The PE is attached to a single local site. This is correct because the output shows only one local site ID (1) under the L2VPN RIB section. A local site ID is a unique identifier for a site within a VPLS domain.
If there were multiple local sites attached to the PE, we would see multiple local site IDs with different prefixes.
The connection has not flapped since it was initiated. This is correct because the output shows that the uptime of the pseudowire is equal to its total uptime (1w6d). This means that the pseudowire has been up for one week and six days without any interruption or flap.
There has been a VLAN ID mismatch. This is not correct because the output shows that the remote and local VLAN IDs are both 0 under the pseudowire state section. A VLAN ID mismatch occurs when the remote and local VLAN IDs are different, which can cause traffic loss or misdelivery. If there was a VLAN ID mismatch, we would see different values for the remote and local VLAN IDs.
The PE router has the capability to pop flow labels. This is correct because the output shows that the flow label pop bit is set under the pseudowire state section. The flow label pop bit indicates that the PE router can pop (remove) the MPLS flow label from the packet before forwarding it to the CE device.
The flow label is an optional MPLS label that can be used for load balancing or traffic engineering purposes.

NEW QUESTION # 93
Exhibit

You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)

A. BGP GTSM requires a firewall filter to discard packets with incorrect TTL.
B. BGP GTSM requires a TTL of 255 to be configured between neighbors.
C. You can implement BGP GTSM between R2, R3, and R4
D. BGP GTSM requires a TTL of 1 to be configured between neighbors.
E. You can implement BGP GTSM between R2 and R1.

Answer: A,B,E

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/multihop-edit-protocols- bgp.html

NEW QUESTION # 94
......

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Grant Moore Grant Moore

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