Juniper JN0-351 Exam | JN0-351復習問題集 -最新アップデートJN0-351最速合格

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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	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 3	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 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.
トピック 5	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
トピック 6	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 7	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.

>> JN0-351復習問題集 <<

Juniper JN0-351最速合格 & JN0-351問題例

当社Juniperでは、JN0-351試験問題についてより幅広い選択肢をお客様に提供することを常に重視しています。今、私たちは約束を実現しました。私たちのウェブサイトは、ほぼすべての種類の公式テストと一般的な証明書をカバーするJN0-351学習教材を提供します。したがって、JpshikenのJN0-351トレーニングガイドのウェブサイトで必要なものを簡単に見つけることができます。ウェブサイトのすべてのJN0-351学習資料は専門的かつ正確であり、学習のプレッシャーを大幅に軽減し、夢のEnterprise Routing and Switching, Specialist (JNCIS-ENT)のJN0-351認定を取得するのに役立ちます。

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q175-Q180):

質問 # 175
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. MAC limiting is enabled on the interface.
B. Dynamic ARP inspection is enabled on the interface.
C. The device that is connected to the interface has performed a DHCPRELEASE.
D. The device that is connected to the interface has a static IP address.

正解：C、D

解説：
If the device connected to the interface has performed a DHCPRELEASE, it releases its IP address back to the DHCP server, resulting in the removal of the corresponding DHCP snooping entry.
If the device connected to the interface is using a static IP address, it will not send DHCP requests, and therefore no entries will be created in the DHCP snooping database for that device.

質問 # 176
You are an operator for a network running 1S-IS. Two routers are failing to form an adjacency. What are two reasons for this problem? (Choose two.)

A. There are mismatched router IDs on the L2 routers.
B. There is no configured ISO address on any IS-IS interface.
C. There is a mismatched area ID between the L2 routers.
D. The family iso configuration is missing from the adjacency interface.

正解：B、D

解説：
Explanation
The two reasons for the failure to form an adjacency in a network running IS-IS could be:
B: There is no configured ISO address on any IS-IS interface. IS-IS requires each router interface to have an ISO address configured. Without this address, the routers cannot form an adjacency1.
D: The family iso configuration is missing from the adjacency interface. The 'family iso' configuration is essential for IS-IS to function correctly. If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency1.
These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks23.

質問 # 177
Which statement is correct about the default administrative distance values used by Junos OS?

A. Directly connected routes have the highest administrative distance.
B. OSPF has a lower administrative distance than static routes.
C. iBGP and eBGP always share the same administrative distance.
D. Static routes have a lower administrative distance than OSPF and BGP by default.

正解：D

解説：
In Junos OS, static routes have a default administrative distance of 5, which is lower (more preferred) than OSPF's default of 10 or BGP's default of 170 (eBGP) and 170 (iBGP), meaning that when multiple protocols learn the same route, the static route is preferred unless administrative distance is manually adjusted. Directly connected interface routes have the lowest administrative distance of 0.

質問 # 178
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

A. 1480 bytes
B. 1500 bytes
C. 1496 bytes
D. 1476 bytes

正解：D

解説：
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is 1476 bytes
1 . This is because GRE packets are formed by the addition of the original packets and the required GRE headers 1 . These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems 1 . The most common IP MTU is 1500-bytes in length (Ethernet) 1 . When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use 1 . For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet - 24-bytes for the GRE encapsulation = 1476-Bytes 1 .

質問 # 179
Which three protocols support BFD? (Choose three.)

A. FTP
B. LACP
C. RSTP
D. OSPF
E. BGP

正解：B、D、E

解説：
Explanation
BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery.
According to the Juniper Networks documentation, the following protocols support BFD on Junos OS devices1:
BGP: BFD can be used to monitor the connectivity between BGP peers and trigger a session reset if a failure is detected. BFD can be configured for both internal and external BGP sessions, as well as for IPv4 and IPv6 address families2.
OSPF: BFD can be used to monitor the connectivity between OSPF neighbors and trigger a state change if a failure is detected. BFD can be configured for both OSPFv2 and OSPFv3 protocols, as well as for point-to-point and broadcast network types3.
LACP: BFD can be used to monitor the connectivity between LACP members and trigger a link state change if a failure is detected. BFD can be configured for both active and passive LACP modes, as well as for static and dynamic LAGs4.
Other protocols that support BFD on Junos OS devices are:
IS-IS: BFD can be used to monitor the connectivity between IS-IS neighbors and trigger a state change if a failure is detected. BFD can be configured for both level 1 and level 2 IS-IS adjacencies, as well as for point-to-point and broadcast network types.
RIP: BFD can be used to monitor the connectivity between RIP neighbors and trigger a route update if a failure is detected. BFD can be configured for both RIP version 1 and version 2 protocols, as well as for IPv4 and IPv6 address families.
VRRP: BFD can be used to monitor the connectivity between VRRP routers and trigger a priority change if a failure is detected. BFD can be configured for both VRRP version 2 and version 3 protocols, as well as for IPv4 and IPv6 address families.
The protocols that do not support BFD on Junos OS devices are:
RSTP: RSTP is a spanning tree protocol that provides loop prevention and rapid convergence in layer 2 networks. RSTP does not use BFD to detect link failures, but relies on its own hello mechanism that sends BPDU packets every 2 seconds by default.
FTP: FTP is an application layer protocol that is used to transfer files between hosts over a TCP connection. FTP does not use BFD to detect connection failures, but relies on TCP's own retransmission and timeout mechanisms.
References:
1: [Configuring Bidirectional Forwarding Detection] 2: [Configuring Bidirectional Forwarding Detection for BGP] 3: [Configuring Bidirectional Forwarding Detection for OSPF] 4: [Configuring Bidirectional Forwarding Detection for Link Aggregation Control Protocol] : [Configuring Bidirectional Forwarding Detection for IS-IS] : [Configuring Bidirectional Forwarding Detection for RIP] : [Configuring Bidirectional Forwarding Detection for VRRP] : [Understanding Rapid Spanning Tree Protocol] : [Understanding FTP]

質問 # 180
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