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Juniper JN0-351 Prüfungsplan:

Thema	Einzelheiten
Thema 1	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Thema 2	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.
Thema 3	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Thema 4	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.

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JN0-351 Prüfungsfrage - JN0-351 Zertifizierungsfragen

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-351 Prüfungsfragen mit Lösungen (Q16-Q21):

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

Antwort: A

Begründung:
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

17. Frage
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

A. Layer 2 control traffic is permitted on the secondary link
B. Redundant trunk groups must be connected to the same aggregation switch.
C. Redundant trunk groups load-balance traffic across two designated uplink interfaces.
D. If the active link fails, then the secondary link automatically takes over.

Antwort: B,D

Begründung:
Redundant Trunk Groups (RTGs) on EX Series switches provide a simple solution for network recovery when a trunk port on a switch goes down 1 . They are configured on the access switch and contain two links:
a primary or active link, and a secondary link 1 . Therefore, option B is correct because if the active link fails, the secondary link automatically starts forwarding data traffic without waiting for normal spanning-tree protocol convergence 1 .
Option D is also correct. In a typical enterprise network composed of distribution and access layers, RTGs are used where one Access switch is connected to two different uplink switches 2 . This implies that RTGs must be connected to the same aggregation switch 2 .

18. Frage
Refer to the exhibit.

Referring to the output shown in the exhibit, which statement is correct?

A. An MTU mismatch exists between the OSPF neighbors.
B. The state is normal for a DRother neighbor
C. An area ID mismatch exists between the OSPF neighbors
D. The state is normal for a DR neighbor.

Antwort: B

Begründung:
In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers 1 . The state "2Way" as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers 1 . This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network 1 . These neighbors are often referred to as " DRothers " 1 .
Therefore, option B is correct.

19. Frage
Which two types of tunnels are able to be created on all Junos devices? (Choose two.)

A. GRE
B. STP
C. IPsec
D. IP-IP

Antwort: A,C

Begründung:
Explanation
Junos devices support various types of tunnels for different purposes12.
Option B is correct. Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network1. Junos devices support GRE tunnels1.
Option D is correct. IPsec (Internet Protocol Security) is a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session1. Junos devices support IPsec tunnels1.
Option A is incorrect. Spanning Tree Protocol (STP) is not a type of tunnel. It's a network protocol designed to prevent loops in a bridged Ethernet local area network2.
Option C is incorrect. While Junos devices do support IP-IP (also known as IP tunneling), it's not supported on all Junos devices1.

20. Frage
You are using tunnels in your network. It is important that the routes be specific enough to ensure that the tunnels are established. You need to prevent a route that is new to the network from being used.
In this scenario, which type of route should be used?

A. static
B. anycast
C. multicast
D. aggregate

Antwort: A

21. Frage
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