JN0-352試験ガイドを購入すると、購入したテストバンクをすぐにダウンロードできます。 JN0-352試験の教材のすべての内容を把握するだけで十分であり、JN0-352試験問題の合格率は非常に高いため、JN0-352試験の学習と準備に必要な時間は20〜30時間です。そして約98％-100％。MogiExam最新のJN0-352クイズトレントには3つのバージョンがあり、学習に最適なものを選択できます。全体として、JN0-352クイズ準備には多くのメリットがあります。
| Section | Objectives |
|---|---|
| Topic 1: OSPF | - Router ID, adjacencies and neighbors - Link-state database and packet types - Areas and LSA types |
| Topic 2: Layer 2 Switching and VLANs | - Inter-VLAN routing - Ports and VLAN tagging - Frame processing - Bridging components - Native VLANs and voice VLANs |
| Topic 3: High Availability | - Link Aggregation Groups and RTG - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD |
| Topic 4: IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| Topic 5: BGP | - Attributes and path selection - BGP basic operations and message types - EBGP and IBGP peer interactions |
| Topic 6: Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| Topic 7: Protocol-Independent Routing | - Load balancing and filter-based forwarding - Martian addresses and RIB groups - Static, aggregate, generated routes |
| Topic 8: Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Topic 9: Layer 2 Security | - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control - BPDU, loop and root protection |
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質問 # 110
You must implement filter-based forwarding. You need to direct traffic from the 192.168.1.0/24 through vr1 and traffic from 10.210.0.128/26 through vr2.
Which configuration is correct in this scenario?
正解：A
質問 # 111
Which two characteristics describe the default behavior of aggregate routes? (Choose two.)
正解：A、D
解説：
The entire purpose of route aggregation is summarization -- replacing a set of more-specific contributing routes with a single, broader prefix advertised outward -- and this summarization inherently hides internal routing instability from external peers: if one of the underlying contributing /24 blocks within a summarized /16 flaps up and down due to a local link issue, external peers who only see the stable, unchanging /16 aggregate are completely insulated from that churn, since the aggregate itself remains active and advertised as long as at least one contributing route is present, regardless of how much internal fluctuation occurs among the individual contributors. This stability- hiding characteristic is one of the primary operational benefits that motivates using aggregate routes in the first place, confirming that statement as correct. Regarding next-hop behavior, official Juniper documentation is explicit and unambiguous:
when an aggregate route is installed in the routing table, Junos assigns it a reject next hop by default, meaning traffic matching only the aggregate (and no more-specific contributor) is dropped and an ICMP unreachable message is returned to the source; a discard next hop is available only as an optional, explicitly configured alternative when silent dropping without ICMP notification is preferred, but it is not the default. Aggregate routes categorically do not advertise their individual contributing routes; suppressing those specific, more- granular prefixes from onward advertisement in favor of the single summary is the aggregate's defining function, directly contradicting the first statement.
質問 # 112
You are verifying a new BGP peering session with an ISP. You issue the show bgp summary command, but the output shows the peer in the Active state. Which statement is correct in this scenario?
正解：B
解説：
The BGP finite state machine defined in RFC 4271 progresses through Idle, Connect, Active, OpenSent, OpenConfirm, and finally Established. The Active state is entered either directly after Idle, when the local router begins retrying a TCP connection setup toward the configured peer, or after a previous Connect attempt has failed and the ConnectRetry timer has expired, prompting the router to keep trying to complete the underlying TCP three-way handshake. Seeing a peer parked in Active therefore means the local device has a fully valid neighbor configuration and is persistently attempting to reach the remote address on TCP port 179, but the handshake is not succeeding -- common root causes include a firewall or ACL blocking TCP 179 between the two endpoints, an unreachable or incorrect peer IP address, the remote BGP process not running or not listening, or an asymmetric routing path preventing the SYN/ACK from returning. It does not indicate a misconfiguration on the local box in the sense of a missing statement (that would typically leave the session as Idle), nor does it indicate an established, functioning session exchanging UPDATE messages (that state is Established), and it is not a deliberately idle/disabled condition, which Junos reports plainly as Idle. Recognizing Active as 'trying to connect' rather than 'connected' is essential for correct BGP troubleshooting sequencing.
質問 # 113
What is the purpose of the native VLAN feature on the Juniper Networks EX Series Switches?
正解：A
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. Reference topics: Junos Enterprise Switching - VLANs, Configuring the Native VLAN on a Trunk Interface.
質問 # 114
A Juniper Networks EX Series Switch has storm control enabled on all interfaces. The ge-0/0/1 interface carrying several VLANs hits its storm control limit and is shut down.
In this scenario, which command allows you to manually clear the violation?
正解：D
解説：
When storm control on an EX Series switch is configured with an action of interface-shutdown (rather than the default of simply dropping excess traffic), exceeding the configured bandwidth threshold for broadcast, multicast, or unknown-unicast traffic causes Junos to administratively disable the offending interface to protect the rest of the switching fabric. Recovery from this condition can happen automatically if a recovery- timeout interval has been configured, but when immediate manual recovery is required, the operational command clear ethernet-switching recovery-timeout interface interface-name explicitly clears the storm- control-triggered violation and re-enables the port without waiting for the timer to expire. This command is purpose-built for this exact condition and is distinct from more general troubleshooting commands: clear ethernet-switching table purges the learned MAC address database and has no bearing on a storm-control- disabled port; clear interface statistics resets traffic counters for diagnostic baselining but does not touch administrative state; and clear log messages simply flushes the local system log buffer. Administrators should also verify the underlying cause of the storm - a switching loop, a misbehaving host, or a misconfigured device - before manually clearing the condition, since without addressing the root cause the port is likely to trip again. This command and workflow are commonly tested as part of the Layer 2 security and resiliency features on EX platforms. Reference topics: Junos Enterprise Switching - Storm Control and Port Security, Recovering Interfaces Disabled by Storm Control.
質問 # 115
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