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Juniper JN0-352 Exam Syllabus Topics:

SectionObjectives
Routing Policy and Filtering- Route filtering and preference control
- Policy statements
Layer 2 Switching Technologies- Ethernet switching concepts
- VLANs and trunking
- Spanning Tree Protocol (STP/RSTP/MSTP)
High Availability- Redundancy concepts in enterprise networks
- VRRP configuration and behavior
Routing Protocols- IS-IS overview
- BGP fundamentals and policy control
- OSPF configuration and troubleshooting
Operations and Troubleshooting- Troubleshooting routing and switching issues
- Junos CLI monitoring tools
Network Services- Basic multicast concepts
- NAT concepts in Junos

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q75-Q80):

NEW QUESTION # 75

Click the Exhibit button.
You have three Juniper Networks EX Series Switches in an STP domain as shown in the exhibit.
Which statement describes the switch that will be elected as the root bridge?

Answer: A

Explanation:
Root bridge election in Spanning Tree Protocol is governed entirely by the Bridge Identifier, an 8-byte value formed by concatenating the configured bridge priority (the higher-order, more significant portion of the comparison) with the switch's MAC address (used strictly as a tiebreaker when priorities are identical). Every participating switch compares Bridge IDs, and the switch advertising the numerically lowest Bridge ID is elected root. In this exhibit, the three switches have distinctly different priority values - EX-1 at the Junos
/IEEE default of 32768, EX-2 at 8192, and EX-3 at 16384 - meaning the comparison is decided entirely at the priority stage and never needs to proceed to a MAC address tiebreak at all. Since 8192 is numerically the lowest of the three priority values, EX-2 is elected root bridge purely on the strength of its lower priority, regardless of what its MAC address happens to be. This is precisely why the correct answer cites priority rather than MAC address as the deciding factor: MAC address only becomes relevant as a tiebreaker in the specific case where two or more switches share an identical priority value, which is not the situation presented here. Understanding that priority is evaluated first and is independently sufficient to decide the outcome whenever it differs is a foundational and heavily tested Spanning Tree concept on the JNCIS-ENT exam.
Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Bridge ID and Root Bridge Election.


NEW QUESTION # 76
Which statement describes how nonstop active routing (NSR) maintains routing protocol information during a Routing Engine switchover?

Answer: B

Explanation:
Nonstop active routing's defining architectural feature is that the backup Routing Engine runs a fully live, active instance of the routing protocol daemon (rpd) in parallel with the primary Routing Engine's rpd instance, continuously, from the moment NSR and its prerequisite GRES are established -- not merely at the instant a switchover begins. As protocol adjacencies form, routes are learned, and the RIB is updated on the primary Routing Engine, that same protocol and RIB state is mirrored in real time to the backup Routing Engine's rpd process through an internal synchronization mechanism, so the backup's protocol state remains a live, up-to-date replica of the primary's at essentially every moment during normal operation. When a switchover occurs, the backup Routing Engine simply assumes the primary role with protocol adjacencies, routing tables, and forwarding state already fully populated and current, allowing it to continue operating without re-establishing neighbor relationships or re-learning the network topology, which is what makes the switchover genuinely nonstop and invisible to neighboring routers. This is fundamentally different from graceful restart, where the restarting router must rebuild its state by requesting help from cooperating neighbors after the fact. The Packet Forwarding Engine plays no role in synchronizing protocol-layer information such as LSAs or BGP updates; that is strictly an rpd-to-rpd function coordinated through the Routing Engine synchronization infrastructure.


NEW QUESTION # 77
You are asked to change the setting for the LSAs age out back to the default value. In this scenario, which time interval will accomplish this task?

Answer: B


NEW QUESTION # 78
Which two elements are used to create the STP bridge ID? (Choose two.)

Answer: A,D


NEW QUESTION # 79
What are two purposes of an aggregate route? (Choose two.)

Answer: A,B


NEW QUESTION # 80
......

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