JN0-352学習テストは、シラバスの変更と、Juniper歴史的な質問や業界の動向に基づいた理論と実践の最新の進展に応じて、何百人もの専門家によって改訂された高品質の製品でした。 あなたが学生であろうとオフィスワーカーであろうと、ルーキーであろうと長年の経験を積んだベテランであろうと、JN0-352ガイドトレントが最適です。 JN0-352学習教材の主な利点は、98％以上のEnterprise Routing and Switching, Specialist (JNCIS-ENT)高い合格率であり、JN0-352試験に合格するには十分です。
| Section | Objectives |
|---|---|
| Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking - Ethernet switching concepts |
| Routing Protocols | - IS-IS overview - BGP fundamentals and policy control - OSPF configuration and troubleshooting |
| Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
実際に、多くの受験者はJN0-352試験に合格したいです。難しいですが、自分自身はより良いものになりたいので、やはりチャレンジしたいです。そのような場合、JN0-352学習教材のようないい資料が必要です。JN0-352学習教材を利用すれば、あなたはJN0-352試験を簡単にパスできます。
質問 # 86
Which statement describes how Rapid Spanning Tree Protocol (RSTP) identifies an alternate port?
正解：D
解説：
RSTP, as defined in IEEE 802.1w, introduces explicit, well-defined port roles that go beyond legacy 802.1D STP's simpler root/designated/blocking model, and the alternate port role is one of RSTP's key refinements. An alternate port is a port that receives BPDUs from a bridge other than the one through which the local switch's actual root port reaches the root bridge -- in other words, it represents a second, redundant path toward the root bridge learned from a different upstream bridge than the one currently providing the best (root port) path. Because the existing root port already provides the lowest-cost, actively used path to the root, the alternate port is deliberately held in the discarding (non-forwarding) state during normal, stable operation, functioning purely as a pre-computed, ready-to-use backup; critically, RSTP's major performance advantage over legacy STP is that if the current root port fails, the switch can transition its alternate port directly and almost instantly into the forwarding root port role without needing to pass through the lengthy listening and learning timer-based states that classic STP required, since the alternate port's suitability as a backup was already continuously verified through ongoing BPDU reception. It is not simply 'not receiving BPDUs' (an alternate port receives BPDUs continuously, just inferior ones relative to the current root port), it is not itself the least-cost path (that describes the root port), and it does not forward based on designated-port overload, which is not a concept that exists in RSTP's port-role logic at all.
質問 # 87
Which statement describes how nonstop active routing (NSR) maintains routing protocol information during a Routing Engine switchover?
正解：A
解説：
Nonstop active routing's defining architectural feature is that the backup Routing Engine runs a fully live, active instance of the routing protocol daemon (rpd) in parallel with the primary Routing Engine's rpd instance, continuously, from the moment NSR and its prerequisite GRES are established -- not merely at the instant a switchover begins. As protocol adjacencies form, routes are learned, and the RIB is updated on the primary Routing Engine, that same protocol and RIB state is mirrored in real time to the backup Routing Engine's rpd process through an internal synchronization mechanism, so the backup's protocol state remains a live, up-to-date replica of the primary's at essentially every moment during normal operation. When a switchover occurs, the backup Routing Engine simply assumes the primary role with protocol adjacencies, routing tables, and forwarding state already fully populated and current, allowing it to continue operating without re-establishing neighbor relationships or re-learning the network topology, which is what makes the switchover genuinely nonstop and invisible to neighboring routers. This is fundamentally different from graceful restart, where the restarting router must rebuild its state by requesting help from cooperating neighbors after the fact. The Packet Forwarding Engine plays no role in synchronizing protocol-layer information such as LSAs or BGP updates; that is strictly an rpd-to-rpd function coordinated through the Routing Engine synchronization infrastructure.
質問 # 88
You are deploying a Juniper Networks EX Series Switch to connect 24 end devices to VLAN 70, with an uplink interface to a distribution switch that carries VLANs 30, 50, and 70. You need to correctly configure the interface type for the end-device interfaces.
In this scenario, which statement is correct?
正解：D
解説：
Each of the 24 end-device-facing interfaces in this scenario needs to carry traffic for exactly one VLAN, and the end devices themselves are ordinary hosts that neither expect nor generate 802.1Q-tagged frames. This is precisely the definition of an access port in Junos: family ethernet-switching interface-mode is set to access, and a single vlan members statement assigns the port to VLAN 70. Access mode ensures frames egressing toward the host are untagged and any frames received are implicitly treated as belonging to the configured VLAN, which is both simpler to manage and more efficient than trunking, since access ports do not carry the
802.1Q tag overhead nor process VLAN pruning logic relevant only to multi-VLAN links. Trunk mode, by contrast, is reserved for switch-to-switch or switch-to-router links that must simultaneously carry frames for multiple VLANs, such as the uplink toward the distribution switch that transports VLANs 30, 50, and 70 together - configuring the 24 host-facing ports as trunks (with or without a native VLAN) would be functionally incorrect and operationally wasteful, since end devices have no need to interpret VLAN tags.
There is also no such behavior in Junos where VLAN-ID numeric value dictates default port behavior, making the 'no configuration needed' option a distractor with no basis in EX Series switching architecture.
Reference topics: Junos Enterprise Switching - VLANs, Configuring Access and Trunk Port Modes.
質問 # 89
How would you view the metric assigned to a route in OSPF? (Choose two.)
正解：A、D
解説：
The metric that OSPF assigns to a destination is visible from two complementary vantage points in Junos. The show route protocol ospf command displays the main routing table filtered to OSPF-learned prefixes, and each entry shows the computed cost alongside the next hop, exactly as it was installed after SPF calculation. The show ospf route command (which accepts filters such as intra- area, inter-area, and extern) presents the OSPF-specific routing table, organized by route type, and explicitly lists the metric column for every intra-area, inter-area, and external route the local router has calculated. Together these two commands give both the RIB-level and the protocol-level view of route cost. By contrast, show ospf database extensive dumps the raw link-state advertisements, where metrics appear only as link-level values buried inside Router or Network LSAs rather than as a resolved route cost, so it is not the direct tool for viewing a route's metric. show ospf interface reports interface operational state, area, and DR/BDR information but does not present a cost or metric field at all in its standard output. Candidates should be comfortable distinguishing the RIB- oriented and protocol-table-oriented verification commands, since JNCIS-ENT scenarios frequently test whether a candidate reaches for the correct show command layer during troubleshooting.
質問 # 90
Which two statements are true about an EX2300 device? (Choose two.)
正解：A、C
質問 # 91
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