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Juniper JN0-352 Exam Syllabus Topics:

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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q30-Q35):

NEW QUESTION # 30
You have configured OSPF routing as shown in the exhibit. You notice that all interfaces have formed full adjacencies, with the exception of the interfaces connecting R3 and R4 with a status of 2Way.

What is the reason for this status?

A. DROther routers will not form a full adjacency with each other.
B. The two routers must both be configured as DR routers.
C. The two routers must be configured in different areas.
D. The interface-type is not configured as p2p.

Answer: A

NEW QUESTION # 31
Which OSPF packet type is sent when an OSPF router detects its database is stale?

A. link-state acknowledgment
B. hello
C. link-state request
D. database description

Answer: C

NEW QUESTION # 32
You have traffic for a video streaming application traversing a GRE tunnel in your network and users are reporting poor performance. Both ends of the tunnel are using the default settings for a gigabit Ethernet interface, but you observe excessive packet drops due to exceeding the MTU.
Which two steps would you take to improve connectivity for this application? (Choose two.)

A. Increase the MTU for the member interfaces to 1500 bytes.
B. Configure the clear-dont-fragment option on the member interfaces.
C. Increase the MTU for the member interfaces to 1524 bytes.
D. Route the GRE tunnel through a higher bandwidth link.

Answer: B,C

NEW QUESTION # 33
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?

A. The destination IP was being resolved using the default route, which now points to the tunnel itself.
B. A GRE interface cannot be used as a next hop for a static route.
C. A GRE interface must use the loopback as its source address to be used as a default route.
D. The tunnel destination must be resolved by a /32 host route.

Answer: A

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. Reference topics: Junos Enterprise Routing - Tunneling, Route Recursion and GRE Tunnel Destination Resolution.

NEW QUESTION # 34
When electing a DIS in an IS-IS network, what is used to break a priority tie?

A. highest MAC address
B. highest router ID
C. lowest router ID
D. lowest MAC address

Answer: A

NEW QUESTION # 35
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