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Juniper JN0-352 Exam Syllabus Topics:

Section	Weight	Objectives
IS-IS	10-15%	- Configuration and route exchange - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting
IP Multicast	5-10%	- IGMP operation and configuration - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms
Layer 2 Switching and VLANs	15-20%	- Link Aggregation Groups (LAG) and Virtual Chassis - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging
Tunnels and Overlays	5-10%	- Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity
OSPF	15-20%	- Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting - Route summarization and redistribution
Protocol Independent Routing	10-15%	- Routing tables, static routes and route preference - Basic routing policy and filter operation - Routing instances and route selection criteria
High Availability and Resiliency	5-10%	- Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing - Network resiliency design and troubleshooting
Layer 2 Security	10-15%	- DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Layer 2 firewall filters and security features - Port security, MAC limiting and storm control
BGP	15-20%	- Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q82-Q87):

NEW QUESTION # 82
Which statement describes how a generated route determines its next hop?

A. It uses a static next hop configured under the aggregate route hierarchy.
B. It uses the next hop of the least-specific contributing route.
C. It uses the next hop of the primary contributing route.
D. It uses the next hop of the first contributing route.

Answer: C

Explanation:
A generate route is a specialized type of Junos summary route that, unlike an aggregate route, is permitted to inherit and use an actual forwarding next hop rather than being restricted to reject or discard. When multiple contributing routes exist beneath the summarized prefix, Junos selects one of them as the primary contributor using a deterministic process: it first evaluates route preference (choosing the contributor with the lowest, most preferred value), then breaks any remaining tie by preferring the contributing route with the numerically lowest metric, and continues through further tie-breaking criteria if necessary until a single primary contributor is identified. The generate route then adopts the next hop of that specific primary contributor as its own forwarding next hop, meaning traffic matching the generate route but not matching any individual contributing route is forwarded toward whichever real next hop the primary (best) contributing route currently uses. This behavior is fundamentally different from an aggregate route, which never adopts a forwarding next hop at all and instead installs with a reject (or optionally discard) next hop by default, deliberately preventing traffic from being forwarded toward a next hop that might not actually lead to the intended more-specific destination. There is no mechanism by which the next hop is chosen arbitrarily from the 'first' or 'least-specific' contributor, and while a next hop can be manually overridden under the generate route's own configuration, that is not the default resolution behavior being described here.

NEW QUESTION # 83
Which three protocols support BFD? (Choose three.)

A. OSPF
B. BGP
C. LACP
D. FTP
E. RSTP

Answer: A,B,C

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/high-availability/topics/topic-map/bfd-configuring.html

NEW QUESTION # 84
You have configured an aggregate route for prefix 10.20.0.0/22 with three contributing routes: 10.20.0.0/24,
10.20.1.0/24, and 10.20.2.0/24. A packet arrives destined to 10.20.3.100.
In this scenario, which action does the router take?

A. It drops the packet and sends an ICMP network unreachable message to the source.
B. It forwards the packet using the next hop for the contributing route with the lowest preference.
C. It silently drops the packet and does not send an ICMP network unreachable message to the source.
D. It forwards the packet using the next hop defined for the aggregate route.

Answer: A

Explanation:
The 10.20.0.0/22 aggregate covers the four /24 blocks 10.20.0.0/24 through 10.20.3.0/24, but only the first three of those (10.20.0.0/24, 10.20.1.0/24, and 10.20.2.0/24) are configured and present as active contributing routes; 10.20.3.0/24, the block containing the destination address 10.20.3.100, has no corresponding contributing route in this configuration. Because no more-specific route exists for 10.20.3.100, the longest- match lookup falls through the missing /24 and matches only the broader /22 aggregate itself. By default, when Junos installs an aggregate route, it assigns that route a reject next hop rather than any usable forwarding next hop; this is a deliberate design choice so that traffic destined for gaps within an advertised summary block - gaps where no real, more-specific path actually exists - is not blindly forwarded toward whatever next hop happens to belong to one of the unrelated contributing routes. A reject next hop causes the router to drop the packet and generate and return an ICMP destination-unreachable message to the originating source, explicitly informing it that no path exists, which is functionally and behaviorally distinct from a silent discard next hop that would drop the packet without any such notification. Aggregate routes never adopt or forward through any single contributing route's next hop, which rules out the two forwarding-based answer choices entirely. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Default Reject Next Hop for Aggregate Routes.

NEW QUESTION # 85
Which statement about the default action of MAC limiting is true when the number of MAC addresses has hit the limit set?

A. The switch stops learning MAC addresses on the offending port, and any traffic to or from the offending MAC address will be dropped.
B. The switch stops learning MAC addresses on the offending port, but floods traffic out of all ports for the offending MAC address.
C. The switch will shut down MAC learning on the offending port for five minutes.
D. The switch will shut down the offending port for five minutes.

Answer: A

NEW QUESTION # 86
What are two interarea OSPF LSA types? (Choose two.)

A. Type 1 router LSAs
B. Type 4 ASBR summary LSAs
C. Type 3 summary LSAs
D. Type 2 network LSAs

Answer: B,C

NEW QUESTION # 87
......

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