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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q17-Q22):

NEW QUESTION # 17
You must ensure that the VPN backbone is preferred over the back door intra-area link as long as the VPN is available.
Referring to the exhibit, which action will accomplish this task?

A. Enable OSPF traffic-engineering.
B. Create an OSPF sham link between the PE routers.
C. Configure the OSPF metric on the backup intra-area link that is higher than the L3VPN link.
D. Configure an import routing policy on the CE routers that rejects OSPF routes learned on the backup intra-area link.

Answer: B

NEW QUESTION # 18
Which two statements describe PIM-SM? (Choose two)

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

Answer: A,B

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 # 19
Exhibit

Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Site-2, PE-2 is not classifying the traffic correctly What should you do to solve the problem?

A. Configure the explicit-null statement on PE-1.
B. Set a static CoS value for the PE-1_to_PE-2 LSP
C. Configure the explicit-null statement on PE-2
D. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP

Answer: A

Explanation:
The explicit-null statement enables the PE router to send an MPLS label with a value of 0 (explicit null) instead of an IP header for packets destined to the VPN customer sites. This allows the penultimate hop router (the router before the egress PE router) to preserve the EXP bits of the MPLS label and pass them to the egress PE router. The egress PE router can then use these EXP bits to classify the traffic according to the CoS policy2
. In this example, PE-1 should configure the explicit-null statement under [edit protocols mpls label-switched-path PE-1_to_PE-2] hierarchy level.

NEW QUESTION # 20
Referring to the exhibit, the 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden.

What are two solutions that will solve this problem? (Choose two.)

A. On R4, add the external EBGP interface's prefix to the IGP routing tables.
B. On R4, add the internal IBGP interface prefixes to the BGP routing tables.
C. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy.
D. On R4, create a policy to change the BGP next hop to 172.16.1.1 and apply it to IBGP as an export policy.

Answer: A,C

NEW QUESTION # 21
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. shaping rate
B. buffer size
C. priority
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.
Final answer: ✅ 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 # 22
......

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