JN0-351試験の準備方法｜最新のJN0-351問題集無料試験｜一番優秀なEnterprise Routing and Switching, Specialist (JNCIS-ENT)認証試験

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Juniper JN0-351 Exam Overview:

Certification Vendor:	Juniper Networks
Exam Name:	Enterprise Routing and Switching, Specialist (JNCIS-ENT)
Exam Number:	JN0-351
Exam Duration:	90 minutes
Certificate Validity Period:	3 years
Passing Score:	Not specified (Pass/Fail status available immediately)
Available Languages:	English
Real Exam Qty:	65
Related Certifications:	JNCIS-ENT
Exam Price:	$300 USD
Exam Format:	Multiple-choice questions
Sample Questions:	Juniper JN0-351 Sample Questions
Exam Way:	Pearson VUE testing centers (In-person)
Pre Condition:	Recommended: JNCIA-Junos certification
Official Syllabus URL:	https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html

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Juniper JN0-351 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Tunnels: The fundamentals of IP tunneling are emphasized, highlighting their requirements and functionalities. Mastery in configuring, monitoring, and troubleshooting tunnels equips professionals to meet the demands of the JN0-351 exam.
トピック 2	Layer 2 Switching or VLANs: This topic deepens the understanding of Layer 2 switching operations within the Junos OS, including VLAN concepts and benefits. Experienced networking professionals gain insights into configuration, monitoring, and troubleshooting techniques essential for network segmentation and efficiency.
トピック 3	Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.
トピック 4	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q108-Q113):

質問 # 108
Which statement is correct about graceful Routing Engine switchover (GRES)?

A. GRES has a helper mode and a restarting mode.
B. With no other high availability features enabled, routing is preserved and the new master RE does not restart rpd.
C. The PFE restarts and the kernel and interface information is lost.
D. When combined with NSR, routing is preserved and the new master RE does not restart rpd.

正解：D

解説：
The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails 1 . GRES preserves interface and kernel information, ensuring that traffic is not interrupted 1 . However, GRES does not preserve the control plane 1 .
To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR) 1 . When GRES is combined with NSR, nearly 75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES 1 . Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur 1 .
Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd 1 .

質問 # 109
You want to prevent rogue BPDUs from lab devices reaching the internal through the Lab_Switch device.

Referring to the exhibit, what should be done to accomplish this task?

A. Configure the three lab ports under the protocols layer2-control bpdu-block hierarchy on the switch
B. Configure an input filter on interface xe-0/2/0 to discard the RSTP packets
C. Configure protocols rstp with the bpdu-block-on-edge parameter for interface xe-0/2/0
D. Configure the three lab ports as edge ports

正解：A

質問 # 110
Which two statements are correct about the Junos OS "load balancing" per-packet feature using an equal-cost multipath (ECMP) policy? (Choose two.)

A. A routing policy with a "load-balance per-packet" action must be applied to enable ECMP forwarding in Junos OS.
B. ECMP requires all paths to have different metrics.
C. ECMP allows traffic to be distributed across multiple equal-cost paths to the same destination.
D. ECMP only works with OSPF, not BGP.

正解：A、C

解説：
Equal-cost multipath (ECMP) allows traffic to be distributed across multiple paths of equal cost toward the same destination, improving link utilization and providing redundancy. In Junos OS, a routing policy with the "load-balance per-packet" action must typically be applied to the forwarding table to enable this per-flow (or per-packet) load balancing behavior across the equal-cost paths, and ECMP can be used with multiple protocols, including OSPF and BGP.

質問 # 111
What does the MAC limiting feature do on EX Series switches?

A. It limits the number of MAC addresses learned on an access port.
B. It limits the acceptable values for a MAC address to a specified range.
C. It limits the time a learned MAC address stays in the MAC routing table.
D. It limits the number of MAC addresses learned on a trunk port.

正解：A

解説：
MAC limiting protects against flooding of the Ethernet switching table (also known as the MAC forwarding table or Layer 2 forwarding table). This feature is enabled on interfaces (ports). MAC limiting sets a limit on the number of MAC addresses that can be learned on a single Layer 2 access port. The MAC limit value in the EX-series switch's default configuration is five MAC addresses. You can configure the MAC limit on an interface, on an interface in a VLAN, or on all interfaces. You can also specify the action to be taken when the MAC limit is exceeded, such as dropping packets, logging messages, or shutting down the interface.
Additionally, you can configure specific "allowed" MAC addresses for the access port. Any MAC address that is not in the list of configured addresses is not learned. Allowed MAC binds MAC addresses to a VLAN so that the address does not get registered outside the VLAN. References:
[EX] How to control MAC address access through Junos OS for EX Series switches1 Configuring MAC Limiting2 Understanding MAC Limiting and MAC Move Limiting3

質問 # 112
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?

A. 300 seconds
B. 1800 seconds
C. 3600 seconds
D. 600 seconds

正解：C

解説：
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/lsa-refresh- interval-edit-protocols-ospf.html

質問 # 113
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