検証するJN0-351テストサンプル問題一回合格-信頼的なJN0-351認定試験

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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
  • 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 2
  • 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.
トピック 3
  • 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.
トピック 4
  • 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 5
  • Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
トピック 6
  • BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
トピック 7
  • Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.
トピック 8
  • 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.

>> JN0-351テストサンプル問題 <<

100％合格JN0-351テストサンプル問題と真実的なJN0-351認定試験

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q64-Q69):

質問 # 64
Which two statements are correct about Junos OS Nonstop Active Routing (NSR)? (Choose two.)

正解：A、B

解説：
Nonstop Active Routing (NSR) synchronizes routing protocol state information, such as OSPF and BGP adjacencies, between the master and backup Routing Engines in real time. This allows a switchover between Routing Engines to occur transparently, without requiring cooperation or awareness from neighboring routers, unlike graceful restart which does require neighbor support.


質問 # 65
Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)

正解：C、D

解説：
Option B is correct. Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated1. This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast1.
Option C is correct. Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received23. This information is stored in a MAC address table, also known as a bridge table23.
Option A is incorrect. Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network2. It's not a mechanism used in building and maintaining a Layer 2 bridge table2.
Option D is incorrect. Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state2. It's not a mechanism used in building and maintaining a Layer 2 bridge table2.


質問 # 66
Referring to the exhibit, why is this OSPF adjacency remaining in this state?

正解：B

解説：
OSPF stuck in ExStart is mainly related to mismatched MTU. It could also be caused by a firewall filter on the loopback interface, but this is not an alternative.


質問 # 67
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

正解：C、D

解説：
* 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 switches 1
. According to the Juniper Networks documentation 2 , 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 link 2 . 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 convergence 2 . This provides fast recovery and redundancy for the network.


質問 # 68
You are asked to explore adding BGP route reflectors to allow for increased scale in your core network.
Which statement is correct in this scenario?

正解：C

解説：
A route reflector is a BGP router that is allowed to break the iBGP loop avoidance rule and advertise routes received from an iBGP peer to another iBGP peer under specific conditions 1 . A route reflector can have three types of peerings: EBGP neighbor, IBGP client neighbor, and IBGP non-client neighbor 2 . A cluster is a group of route reflectors and their clients that are fully meshed 3 . The cluster ID is a 4-byte value that identifies the route reflector cluster and is carried in the ORIGINATOR_ID attribute of the BGP update message 4 . The cluster ID is used to prevent routing loops among route reflectors and their clients. If a route reflector receives a route with its own cluster ID, it discards the route 5 . Therefore, the cluster ID is required to prevent routing loops when using route reflectors.
References:
1 : What is BGP Route Reflector - Explanation & Discussion (Cisco Example)
2 : BGP Route Reflector - NetworkLessons.com
3 : BGP Route Reflectors (RR) - Cisco Community
4 : Junos OS Routing Protocols Library for Routing Devices
5 : Junos OS Routing Protocols Library for Routing Devices


質問 # 69
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