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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	OSPF: The concepts and operational details of OSPF are explored, providing tools for routing efficiency. Configuration and troubleshooting mastery ensure readiness for both the exam and complex enterprise environments.
Topic 2	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.
Topic 3	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.
Topic 4	High Availability: This topic covers the importance and application of high availability within Junos OS environments. Knowledge in configuring and managing these components is critical for ensuring robust and uninterrupted network operations, aligning with exam expectations.
Topic 5	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 6	IS-IS: Aspiring Juniper networking professionals enhance their understanding of IS-IS routing protocols. This topic equips candidates with the knowledge to configure and monitor IS-IS systems, addressing specific exam challenges and practical applications.
Topic 7	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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q35-Q40):

NEW QUESTION # 35
What are two characteristics of RSTP alternate ports? (Choose two.)

A. RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.
B. RSTP alternate ports provide an alternate lower cost path to the root bridge.
C. RSTP alternate ports provide an alternate higher cost path to the root bridge.
D. RSTP alternate ports are active ports used to forward frames toward the root bridge.

Answer: A,C

Explanation:
A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port1. However, an alternate port does not forward any traffic, as it is in a discarding state2. It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port1.
C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID3. However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself1. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.

NEW QUESTION # 36
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

A. Redundant trunk groups load balance traffic across two designated uplink interfaces.
B. Layer 2 control traffic is permitted on the secondary link.
C. Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.
D. If the active link fails, then the secondary link automatically takes over.

Answer: B,D

Explanation:
C is correct because Layer 2 control traffic is permitted on the secondary link of a redundant trunk group (RTG) on EX Series switches. Layer 2 control traffic includes protocols such as LLDP, LACP, and STP, which are used to exchange information and coordinate actions between switches1. According to the Juniper Networks documentation2, Layer 2 control traffic is allowed to pass through both the active and the secondary links of an RTG, but data traffic is only forwarded through the active link. This allows the switches to maintain their Layer 2 adjacencies and monitor the link status on both links.
D is correct because if the active link fails, then the secondary link automatically takes over in an RTG on EX Series switches. An RTG consists of two trunk links: an active or primary link, and a secondary or backup link2. The active link is used to forward data traffic, while the secondary link is in standby mode. If the active link fails or becomes unavailable, the secondary link immediately transitions to a forwarding state and takes over the data traffic without waiting for normal STP convergence2. This provides fast recovery and redundancy for the network.

NEW QUESTION # 37
Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems? (Choose two.)

A. EBGP routers will drop routes that contain their own AS number in the AS_PATH
B. EBGP routers will prepend their AS number when advertising routes to their neighbors
C. EBGP routers will append their AS number when advertising routes to their neighbors.
D. EBGP routers will only accept routes that contain their own AS number in the AS_PATH.

Answer: A,B

NEW QUESTION # 38
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)

A. The device that is connected to the interface has performed a DHCPRELEASE.
B. The device that is connected to the interface has a static IP address.
C. MAC limiting is enabled on the interface.
D. Dynamic ARP inspection is enabled on the interface.

Answer: B,C

Explanation:
The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information 1
. This database is used to filter and validate DHCP messages from untrusted sources 1 .
However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:
* MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping. MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks 1 . This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.
* Static IP address : If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database
1 . The DHCP snooping feature relies on monitoring DHCP messages to build its database 1 , so devices with static IP addresses that do not send DHCP messages will not have their information added.
Therefore, options B and C are correct. Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database 1 , and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created 1 .

NEW QUESTION # 39
Which two statements are correct about the Junos OS "commit confirmed" command? (Choose two.)

A. It is useful for testing configuration changes that could affect remote connectivity.
B. It disables the ability to roll back the configuration entirely.
C. It automatically rolls back the configuration if a subsequent confirming commit is not issued within a specified time.
D. It permanently commits the configuration with no rollback option.

Answer: A,C

Explanation:
The "commit confirmed" command in Junos OS commits a configuration change but automatically schedules a rollback to the previous configuration if a follow-up "commit" (confirming commit) is not issued within the specified timeframe (default 10 minutes). This is particularly useful when making changes that could disrupt remote management access, providing a safety net against being locked out.

NEW QUESTION # 40
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