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Juniper JN0-352 Exam Syllabus Topics:

SectionWeightObjectives
Protocol Independent Routing10-15%- Basic routing policy and filter operation
- Routing tables, static routes and route preference
- Routing instances and route selection criteria
High Availability and Resiliency5-10%- Network resiliency design and troubleshooting
- Graceful restart and non-stop routing
- Redundancy protocols and failover mechanisms
Layer 2 Switching and VLANs15-20%- VLAN concepts, configuration, trunking and tagging
- Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration
- Link Aggregation Groups (LAG) and Virtual Chassis
OSPF15-20%- Neighbor formation, area design and LSA types
- Route summarization and redistribution
- Configuration, verification and troubleshooting
IS-IS10-15%- Scalable enterprise deployment and troubleshooting
- Adjacency establishment, levels and metrics
- Configuration and route exchange
IP Multicast5-10%- Multicast routing monitoring and troubleshooting
- PIM Dense Mode, Sparse Mode and RP mechanisms
- IGMP operation and configuration
Layer 2 Security10-15%- DHCP snooping, Dynamic ARP Inspection and IP Source Guard
- Port security, MAC limiting and storm control
- Layer 2 firewall filters and security features
BGP15-20%- Neighbor relationships and session establishment
- Route advertisement, attributes and path selection
- Routing policies, filtering and common troubleshooting
Tunnels and Overlays5-10%- Tunnel types, encapsulation and operation
- GRE, IP-IP and dynamic tunnel configuration
- Overlay network design and connectivity

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q91-Q96):

NEW QUESTION # 91

Click the Exhibit button.
Which two statements about the IS-IS output shown in the exhibit are correct? (Choose two.)

Answer: A,B

Explanation:
This detailed adjacency output shows R3 maintaining four separate, fully Up adjacencies, evenly split between the two IS-IS levels. R1 and R2 are both formed at Level 1, confirming that R3 is directly adjacent to exactly two Level 1 neighbors within its local area, which validates that statement. R4 and R5 are both formed at Level 2, and Level 2 adjacencies are, by definition, part of the IS-IS backbone that interconnects areas; a router maintaining any Level 2 adjacency is by that fact participating in and connected to the Level 2 backbone, confirming R3's backbone connectivity as well. Every one of the four listed adjacencies explicitly shows 'Speaks: IP, IPv6' in its detail output, which is Junos's way of indicating that both the IPv4 and IPv6 address families have been successfully negotiated and are active over that circuit; this directly contradicts, rather than supports, the claim that IPv6 is disabled on these neighbors - if IPv6 were disabled, the Speaks field would list only IP. Regarding authentication, the output contains no field, flag, or indication whatsoever referencing authentication configuration or state for the R5 adjacency (or any adjacency); Junos would typically surface authentication-related information separately if it were configured and relevant, and its complete absence here means no basis exists in the exhibit to conclude authentication is required for that specific adjacency. Reference topics: Junos Enterprise Routing - IS-IS, Level 1 and Level 2 Adjacencies and Address Family Negotiation.


NEW QUESTION # 92
You have configured a GRE tunnel from your local router with tunnel source 10.0.0.1 to a remote router at destination 192.168.0.1. The tunnel is functioning until you commit set routing-options static route 0.0.0.0/0 next-hop gr-0/0/0. This configuration causes the tunnel to go down. Which statement is correct in this scenario?

Answer: B

Explanation:
A GRE tunnel's outer, delivery-layer packets are forwarded using the router's ordinary underlay routing table, meaning the tunnel destination address (192.168.0.1 in this case) must itself be resolvable to a physical, non-tunnel next hop for the encapsulated packets to actually leave the router. Before this configuration change, the default route (or some more specific route) presumably pointed toward a real physical next hop, allowing the router to reach 192.168.0.1 and keep the tunnel operational. When the administrator commits a static default route of 0.0.0.0/0 with a next hop of gr-0/0/0, every destination lookup that previously fell back to the default route -- including the lookup for the tunnel's own destination address, 192.168.0.1, since no more specific route exists for it -- now recurses through the GRE interface itself. This creates a circular dependency: the router needs to route to 192.168.0.1 to keep the tunnel up, but the only route it has to reach 192.168.0.1 now points back into the tunnel that requires 192.168.0.1 to already be reachable, so the interface's next-hop resolution fails and the tunnel drops. This is an entirely valid and common GRE design pitfall rather than any platform restriction; GRE interfaces can be legitimately used as static route next hops, do not require loopback-sourced encapsulation, and do not require a /32 host route to resolve their destination, provided that route does not recursively point back through the tunnel.


NEW QUESTION # 93
Which three statements are correct about OSPF packet types? (Choose three.)

Answer: A,B,C


NEW QUESTION # 94
How many bytes of overhead does an IP-IP tunnel add to a packet?

Answer: C


NEW QUESTION # 95
Two Juniper Networks EX Series Switches are connected with four 1-GbE links configured as a single link aggregation group (LAG). One of the physical member links experiences a failure.
By default, what impact will this failure have on traffic forwarding between the switches?

Answer: B

Explanation:
A link aggregation group bundles multiple physical Ethernet links into a single logical interface (an ae interface) specifically to provide both increased aggregate bandwidth and link-level redundancy. By default, the aeX interface remains operationally up as long as at least one member link within the bundle remains active and passing traffic; the LAG does not require every member link to be functional to continue operating.
When one of the four 1-GbE member links in this scenario fails, LACP (if in use) or the underlying link- status monitoring detects the failure, removes that specific link from the active forwarding set, and redistributes traffic hashing across the three remaining healthy member links automatically and without operator intervention. End devices and upper-layer protocols continue to see a single, continuously up ae interface throughout this process, experiencing only a proportional reduction in available aggregate bandwidth rather than any interruption in connectivity. This default behavior is precisely why LAG is a foundational building block for resilient EX Series switch interconnects in enterprise and data center designs, since it allows individual optic, cable, or transceiver failures to be absorbed transparently. None of the distractor behaviors - full administrative shutdown of the bundle, forwarding limited to broadcast traffic only, or a temporary disabling of all member links during renegotiation - reflect actual Junos LAG behavior, which is designed explicitly to avoid any such disruption. Reference topics: Junos Enterprise Switching - Layer 2 Switching, Link Aggregation Group Resiliency.


NEW QUESTION # 96
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