JN0-352 Actual Exam Dumps & Valid Dumps JN0-352 Book

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Juniper JN0-352 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: High Availability and Resiliency5-10%- Network resiliency design and troubleshooting
- Graceful restart and non-stop routing
- Redundancy protocols and failover mechanisms
Topic 2: 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
Topic 3: IP Multicast5-10%- IGMP operation and configuration
- Multicast routing monitoring and troubleshooting
- PIM Dense Mode, Sparse Mode and RP mechanisms
Topic 4: Layer 2 Security10-15%- Layer 2 firewall filters and security features
- DHCP snooping, Dynamic ARP Inspection and IP Source Guard
- Port security, MAC limiting and storm control
Topic 5: IS-IS10-15%- Scalable enterprise deployment and troubleshooting
- Adjacency establishment, levels and metrics
- Configuration and route exchange
Topic 6: Tunnels and Overlays5-10%- Tunnel types, encapsulation and operation
- GRE, IP-IP and dynamic tunnel configuration
- Overlay network design and connectivity
Topic 7: Protocol Independent Routing10-15%- Routing tables, static routes and route preference
- Basic routing policy and filter operation
- Routing instances and route selection criteria
Topic 8: BGP15-20%- Routing policies, filtering and common troubleshooting
- Route advertisement, attributes and path selection
- Neighbor relationships and session establishment
Topic 9: OSPF15-20%- Neighbor formation, area design and LSA types
- Route summarization and redistribution
- Configuration, verification and troubleshooting

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q94-Q99):

NEW QUESTION # 94
You are required to ensure that Switch 1 will always be designated as the root bridge when participating in your switched network.
What do you need to do to satisfy this requirement?

Answer: D

Explanation:
Because root bridge election is decided primarily by comparing bridge priority values - with the switch advertising the numerically lowest priority always winning, and MAC address serving only as a fallback tiebreaker when priorities are tied - the only deterministic, reliable way to guarantee that a specific switch is elected root regardless of any other switch's hardware characteristics is to explicitly configure that switch with a lower bridge priority than every other participating switch in the topology. Relying on MAC address alone, as the first distractor suggests, is fundamentally unreliable: MAC addresses are burned in at the factory, cannot be predicted or controlled by the administrator, and any future hardware replacement or newly introduced switch with a numerically lower MAC address could unexpectedly seize the root role since MAC comparison only comes into play at equal priority in the first place, meaning a 'highest MAC' strategy does not even align with how the tiebreak actually favors the lowest value. Port priority and port cost are entirely separate STP parameters that influence which port on a non-root switch is selected as its root port, or which port is selected as designated versus blocking on a given segment; neither parameter has any bearing whatsoever on which switch is elected root bridge for the whole topology, since that decision is made purely from the Bridge ID comparison, independent of any per-port settings. Explicitly and deliberately lowering Switch 1's configured bridge priority is the only correct, industry-standard method. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Guaranteeing Root Bridge Placement via Bridge Priority.


NEW QUESTION # 95
A GRE tunnel is experiencing fragmentation issues. You confirm that the tunnel is up and is functioning correctly. You confirm that hosts are sending 1500-byte packets. In this scenario, which statement is correct?

Answer: A

Explanation:
GRE encapsulation adds a fixed 24 bytes of overhead to every packet it carries -- 4 bytes for the GRE header itself and 20 bytes for the new outer IPv4 delivery header. When a host transmits a full 1500-byte Ethernet payload into a gr- interface, the resulting encapsulated packet becomes
1524 bytes, which exceeds the physical interface's standard 1500-byte MTU and forces fragmentation or drops if the don't-fragment bit is set. The correct remediation is to reduce the effective MTU seen by end hosts so that encapsulated packets never exceed the physical link's transmission limit. Junos automatically applies this logic to gr-logical interfaces, which default to a
1476-byte protocol MTU (1500 minus 24), but when the underlying physical interface or a manually configured path is involved, administrators must explicitly size the interface MTU to
1476 bytes to prevent post-encapsulation oversize packets. Allowing fragmentation with clear- dont-fragment is a workaround that increases CPU load and can degrade performance rather than solving the root cause, BFD addresses link-failure detection rather than MTU sizing, and ToS copying affects only the type-of-service byte, not packet length.


NEW QUESTION # 96
Which command solves the error that you see in the exhibit?

Answer: B

Explanation:
The error in the exhibit occurs because an access interface can only be a member of one VLAN, but it is currently configured with the "default" VLAN and is trying to be added to VLAN "v11." To resolve the issue, the correct command is:
delete ge-0/0/2 unit 0 family ethernet-switching vlan members default
This command removes the interface from the "default" VLAN, allowing it to be part of VLAN
"v11" as intended.


NEW QUESTION # 97
Both the R1 and R2 devices are advertising prefix X into AS 65530 with the BGP attributes shown in the exhibit.

Which statement is correct in this scenario?

Answer: D


NEW QUESTION # 98
Which two multicast IP addresses are used for link-state update packets? (Choose two.)

Answer: A,D


NEW QUESTION # 99
......

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