JuniperのJN0-352認定試験は現在のIT領域で本当に人気がある試験です。この試験の認証資格を取るのは昇進したい人々の一番良く、最も効果的な選択です。しかも、この試験を通して、あなたも自分の技能を高めて、仕事に役に立つスキルを多くマスターすることができます。そうすれば、あなたはもっと素敵に自分の仕事をやることができ、あなたの優れた能力を他の人に見せることができます。この方法だけであなたはより多くの機会を得ることができます。
| Section | Objectives |
|---|---|
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Routing Protocols | - BGP fundamentals and policy control - IS-IS overview - OSPF configuration and troubleshooting |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Layer 2 Switching Technologies | - Ethernet switching concepts - VLANs and trunking - Spanning Tree Protocol (STP/RSTP/MSTP) |
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質問 # 175
When trying to commit the configuration shown in the exhibit, you receive an error.
What is the problem?
正解：A
質問 # 176
What determines the preferred route to a destination in an IS-IS network?
正解：C
解説：
IS-IS is a link-state protocol that, like OSPF, runs Dijkstra's Shortest Path First algorithm independently on each router against its own copy of the synchronized link-state database to compute the best path toward every reachable destination. Each link within the topology carries an administrator-assigned or default metric, and as the SPF algorithm walks the topology graph from the local router outward, it sums the metrics of every link traversed along a candidate path to produce that path's total accumulated cost. Among all possible paths to a given destination prefix, IS-IS always selects and installs the path (or, in the case of equal-cost multipath, the set of paths) with the numerically lowest total accumulated metric, exactly mirroring the 'lowest cost wins' principle shared by essentially all link-state IGPs. A higher accumulated metric value is by definition a less preferred, more costly path, making that option the direct inverse of correct IS-IS behavior. Level 2 proximity to the destination has no independent bearing on path selection beyond however it happens to be reflected in the accumulated metric itself - IS-IS does not apply a separate rule preferring paths merely for passing near a Level 2 router. Likewise, LSP recency (sequence number or freshness) governs which version of a given LSP is trusted and flooded during database synchronization, ensuring the topology database itself is accurate and loop-free, but it plays no role in the SPF cost comparison once the database is synchronized and consistent. Reference topics: Junos Enterprise Routing - IS-IS, SPF Calculation and Metric-Based Path Selection.
質問 # 177
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)
正解：C、D
解説：
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device. A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet- switching. The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term. To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer
3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks.
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface
質問 # 178
Which two statements are correct about VRRP? (Choose two.)
正解：A、C
解説：
The virtual IP address must match on all participating devices - All routers in the same VRRP group must be configured with the same virtual IP address to provide redundancy.
The VRRP group number must match on all participating devices - All routers in the same VRRP group must have the same group number to identify the VRRP group.
質問 # 179
What is the purpose of the native VLAN feature on the Juniper Networks EX Series Switches?
正解：D
解説：
A native VLAN is a trunk-port concept, not an access-port concept. On an 802.1Q trunk, every frame is normally expected to carry a VLAN tag identifying its membership; the native VLAN is the single exception that Junos permits an administrator to define using the native-vlan-id statement under the trunk interface's family ethernet-switching hierarchy. Any untagged frame arriving on that trunk port is automatically classified into the configured native VLAN, and conversely, outbound frames belonging to the native VLAN are transmitted untagged rather than with an 802.1Q header. This behavior exists chiefly for interoperability with legacy or third-party devices that either cannot generate 802.1Q tags or intentionally send management or default traffic untagged across an otherwise tagged trunk. Access ports, by definition, only ever carry a single VLAN's traffic and never receive tagged frames in normal operation, so the native VLAN mechanism has no relevance there -- which eliminates the access-port-oriented answer choices.
The native VLAN also does not restrict a trunk to a single VLAN; the trunk continues to carry all configured tagged VLANs simultaneously, with the native VLAN simply being the designated untagged exception. Misconfiguring or mismatching native VLAN IDs between two trunk peers is a classic Layer 2 troubleshooting scenario on the exam.
質問 # 180
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