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Juniper JN0-352 Exam Syllabus Topics:

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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q86-Q91):

NEW QUESTION # 86
You are configuring a GRE tunnel between Router A (192.168.1.1) and Router B (192.168.2.1) to connect two isolated networks. The tunnel interfaces (gr-0/0/0) need to support IPv4 traffic.
In this scenario, which configuration ensures the tunnel endpoints are correctly defined and reachable?

Answer: D

Explanation:
A functioning GRE tunnel interface in Junos requires, at minimum, both a tunnel source address and a tunnel destination address configured together under the tunnel statement of the gr- logical unit, since these two values together define the outer, delivery-layer IP header that will encapsulate every passenger packet sent through the tunnel; the source identifies which of the router's own addresses will originate the encapsulated traffic, and the destination identifies the remote tunnel endpoint the encapsulated traffic must be routed toward across the underlying IP network. The first option correctly supplies both required values in a single, complete statement - source 192.168.1.1 (Router A's own address) and destination 192.168.2.1 (Router B's address) - fully defining the tunnel's endpoints and ensuring the encapsulation and route-resolution process can succeed. The fourth option supplies only the destination and omits the source entirely, which is an incomplete configuration; without an explicit source, Junos cannot always reliably determine which local address to use for encapsulation, particularly on multi-address or multi-interface routers, and the tunnel configuration is left non-deterministic or non-functional as shown. The second option enables the IPv6 protocol family on the tunnel's logical unit, which is irrelevant to a scenario explicitly requiring IPv4 passenger traffic support. The third option attempts to assign a family inet address directly using one of the underlying tunnel endpoint addresses, which conflates the tunnel's own transport addressing with logical-unit protocol addressing and does not by itself establish the required source/destination tunnel definition.
Reference topics: Junos Enterprise Routing - Tunneling, Configuring GRE Tunnel Source and Destination.


NEW QUESTION # 87

Click the Exhibit button.
Referring to the exhibit, all possible firewall filters are configured along the path from Server A to Server B.
In which order will Switch 1 process transmit (Tx) and receive (Rx) firewall filters?

Answer: B

Explanation:
Because Server A resides in VLAN 10 and Server B resides in VLAN 20, traffic between them cannot remain a purely Layer 2 switched flow; it must be routed between the two VLANs, which on Switch 1 means the packet traverses the switch's internal routing engine (via an IRB interface) between the ingress and egress switching stages. Junos processes firewall filters along this path in a strict, layered order that mirrors the packet's actual journey through the device. First, any filter applied at the physical ingress port level (Rx-Port) is evaluated as the frame first arrives on ge-0/0/10. Next, any filter applied to the ingress VLAN (Rx-VLAN, i.
e., VLAN 10) is evaluated as the frame is classified into its source broadcast domain. Because the destination subnet requires routing, the packet is then handed to the routing engine, where any input/ingress routed filter (Rx-Router) applied to the receiving IRB interface is evaluated next, followed by any output/egress routed filter (Tx-Router) applied as the now-routed packet is handed from the routing engine back out toward VLAN
20. Finally, the packet passes through any egress VLAN filter (Tx-VLAN, for VLAN 20) and then the egress physical port filter (Tx-Port) on ge-0/0/20 immediately before transmission to Server B. This complete six- stage sequence - Rx-Port, Rx-VLAN, Rx-Router, Tx-Router, Tx-VLAN, Tx-Port - reflects every filter- evaluation checkpoint a routed, inter-VLAN packet passes through on an EX Series Layer 3 switch.
Reference topics: Junos Enterprise Switching - Layer 2 Switching and Firewall Filter Processing Order for Routed VLAN Traffic.


NEW QUESTION # 88
Click the Exhibit button. You are asked to ensure that there will not be any unwanted STP topology changes affecting your root bridge placement because a rogue switch was introduced into the network at the access layer. Referring to the exhibit, which interfaces will need to have root protection applied to accomplish this task?

Answer: B

Explanation:
Root protection (root guard) must always be applied on the ports of the switches you trust to remain root-bridge-eligible, specifically on the interfaces facing away from the legitimate root and toward parts of the network where an untrusted or rogue device could plausibly appear and begin transmitting superior BPDUs. In this topology, Switch-1 is the intended, permanent root bridge (lowest priority, 4k), and Switch-2 is its aggregation-layer peer; both sit above the access layer, where Switch-3 and Switch-4 connect downstream toward end-user-facing infrastructure and where an accidental or malicious rogue switch is realistically most likely to be introduced. The ge-
0/0/6 and ge- 0/0/8 interfaces on Switch-1 and Switch-2 are precisely the downlink ports facing that access layer, meaning they are the exact points at which a rogue switch's superior BPDU (one advertising a lower priority than the legitimate root) would first be received if such a device appeared beneath Switch-3 or Switch-4. Applying root protection on those specific interfaces causes Junos to immediately block (move to a root-inconsistent, discarding state) any port that receives a superior BPDU, preventing the rogue device from ever being accepted as root, while normal, non-superior BPDUs continue to be processed without disruption. Applying root guard on Switch-1 and Switch-2's peer link (ge- 0/0/12/13) would be inappropriate, since that link legitimately connects two trusted, root-eligible switches.


NEW QUESTION # 89
Which command displays the output shown in the exhibit?

Answer: B

Explanation:
This command shows the Ethernet switching table, which includes information about MAC addresses, their associated VLANs, and the interfaces they are learned on, similar to the output shown in your exhibit.


NEW QUESTION # 90
You have configured a GRE interface, but no traffic will flow.
Referring to the exhibit, which statement is true?

Answer: C


NEW QUESTION # 91
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