[2025年04月最新リリース] 合格できるJN0-280試験にはリアル問題とアンサー
合格できるJN0-280レビューガイド、頼もしいJN0-280テストエンジン
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質問 # 51
Which of the following VLAN port modes exist in Junos OS? (Choose two)
- A. Tunnel
- B. Aggregated
- C. Access
- D. Trunk
正解：C、D
質問 # 52
Exhibit:
Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?
- A. 2000 seconds
- B. 400 milliseconds
- C. 2000 milliseconds
- D. 400 seconds
正解：C
解説：
The exhibit shows the configuration ofBidirectional Forwarding Detection (BFD)for OSPF on interface xe-
0/0/4.0, with the following parameters:
* minimum-interval: 400 milliseconds
* multiplier: 5
Step-by-Step Breakdown:
* BFD Liveness Detection:BFD is used to detect link failures at sub-second intervals, providing faster convergence times for routing protocols like OSPF. Theminimum-intervalis the time between BFD control packets (in milliseconds), and themultiplierindicates how many missed BFD packets trigger a failure.
* Calculating Failure Detection Time:The failure detection interval is calculated as:
Failure Interval=minimum-interval×multiplier\text{Failure Interval} = \text{minimum-interval} \times \text
{multiplier}Failure Interval=minimum-interval×multiplier
In this case:
400 milliseconds×5=2000 milliseconds(2seconds)400 \, \text{milliseconds} \times 5 = 2000 \, \text
{milliseconds} (2 seconds)400milliseconds×5=2000milliseconds(2seconds)
* Conclusion:If no BFD control packets are received within2000 milliseconds (2 seconds), the interface will be considered down, triggering OSPF to recalculate routes.
Juniper Reference:
* BFD Configuration: BFD parameters such as minimum-interval and multiplier are used to fine-tune the failure detection time for faster convergence.
質問 # 53
In the Junos OS, which feature is used to create an alternate next hop with a unique preference for a static route?
- A. Next-hop
- B. Resolve
- C. Preference
- D. Qualified-next-hop
正解：D
解説：
In Junos OS, thequalified-next-hopfeature is used to specify an alternate next hop for a static route, along with a unique preference value.
Step-by-Step Breakdown:
* Qualified-Next-Hop:Aqualified-next-hopallows you to define multiple next hops for a static route, each with its own preference. This provides flexibility by allowing the router to choose the best available next hop based on reachability and preference.
* Use Case:If the primary next hop becomes unreachable, the router can automatically switch to the alternate next hop defined by thequalified-next-hopwith a higher preference value.
* Command Example:
set routing-options static route 10.10.10.0/24 qualified-next-hop 192.168.1.1 preference 5 set routing-options static route 10.10.10.0/24 qualified-next-hop 192.168.1.2 preference 10
* Preference:The next hop with the lowest preference is chosen first. If it becomes unavailable, the router will use the higher preference next hop.
Juniper Reference:
* Qualified-Next-Hop: This feature is used to configure backup or alternate next hops for static routes in Juniper devices.
質問 # 54
Load balancing in routing is used to:
- A. Automatically update routing tables.
- B. Compress data to improve transmission speed.
- C. Encrypt data packets.
- D. Distribute traffic evenly across multiple paths.
正解：D
質問 # 55
You want to minimize topology disruptions in your network when the rpd process restarts on a device. Which service would accomplish this task?
- A. graceful restart (GR)
- B. link aggregation groups
- C. Virtual Chassis
- D. Bidirectional Forwarding Detection (BFD)
正解：A
解説：
Graceful Restart (GR)is a feature that allows a router to maintain forwarding even when the routing process (e.g., the rpd process in Junos) is restarting, minimizing disruption to the network.
Step-by-Step Breakdown:
* Graceful Restart Function:During aGR event, the forwarding plane continues to forward packets based on existing routes, while the control plane (rpd process) is restarting. This prevents traffic loss and maintains routing stability.
* Minimizing Disruptions:GR is particularly useful in ensuring continuous packet forwarding during software upgrades or routing protocol process restarts.
Juniper Reference:
* Graceful Restart in Junos: GR ensures high availability by maintaining forwarding continuity during control plane restarts, enhancing network reliability.
質問 # 56
Which Junos OS routing table stores IPv6 addresses?
- A. inet.0
- B. inet6.0
- C. inet0.6
- D. inet.6
正解：B
解説：
In Junos OS, routing information is stored in different routing tables depending on the protocol and address family. For IPv6 addresses, the routing table used isinet6.0.
Step-by-Step Explanation:
* Routing Tables in Junos:
* inet.0: This is the primary routing table for IPv4 unicast routes.
* inet6.0: This is the primary routing table for IPv6 unicast routes.
* inet.3: This routing table is used for MPLS-related routing.
* Other routing tables, like inet.1, inet.2, are used for multicast and other specific purposes.
* inet6.0 Routing Table:When IPv6 is enabled on a Juniper router, all the IPv6 routes are stored in the inet6.0table. This includes both direct routes (connected networks) and learned routes (from dynamic routing protocols like OSPFv3, BGP, etc.).
* Verification:To view IPv6 routes, the command show route table inet6.0 is used. This will display the contents of the IPv6 routing table, showing the network prefixes, next-hop addresses, and protocol information for each route.
Juniper Reference:
* Junos Command: Use show route table inet6.0 to check IPv6 routing entries.
* IPv6 Routing: Ensure that the IPv6 protocol is enabled on interfaces and that routingprotocols like OSPFv3 or BGP are properly configured for IPv6 traffic handling.
質問 # 57
In the context of Layer 2 switching, what does RSTP stand for?
- A. Resilient Switching Transport Protocol
- B. Rapid Spanning Tree Protocol
- C. Redundant Switching Tree Protocol
- D. Routing Switch Transport Protocol
正解：B
質問 # 58
Which of the following are functions of MACsec? (Choose two)
- A. It enables VLAN tagging.
- B. It prevents MAC flooding attacks.
- C. It provides Layer 2 encryption.
- D. It offers data integrity and confidentiality.
正解：C、D
質問 # 59
Which statement is correct about OSPF?
- A. OSPF is link-state protocol
- B. OSPF is a path-vector protocol
- C. OSPF is a device-state protocol
- D. OSPF is a distance-vector protocol
正解：A
質問 # 60
Exhibit:
Referring to the exhibit, which statement is correct?
- A. The configuration will commit successfully and BGP group 1 will operate as IBGP.
- B. BGP group 1 requires a type internal parameter.
- C. The configuration will commit successfully and BGP group 1 will operate as EBGP.
- D. BGP group 1 requires a type external parameter.
正解：C
解説：
In the exhibit, BGP is configured withlocal AS 65101and a neighbor at172.16.1.1inpeer AS 65201. This setup involves two different Autonomous Systems (AS), indicating anExternal BGP (EBGP)configuration.
Step-by-Step Breakdown:
* EBGP vs. IBGP:
* EBGPis used between routers in different ASes. In this case, the local AS is65101and the peer AS is65201, meaning the BGP session isEBGP.
* IBGPis used between routers within the same AS, which is not applicable here as the AS numbers are different.
* BGP Group Configuration:
* The configuration does not require a type external parameter because Junos OSautomatically recognizes the session asEBGPwhen the local and peer AS numbers are different.
* The BGP session will operate as EBGP, and the configuration will commit successfully.
Juniper Reference:
* BGP Configuration: In Juniper, EBGP is automatically recognized when the local and peer AS numbers differ, without needing to specify type external.
質問 # 61
Referring to the exhibit, which protocol is associated with the route selected for traffic destinated to 10.255.14.177?
- A. OSPF
- B. BGP
- C. Local
- D. Direct
正解：B
質問 # 62
How does VLAN tagging benefit network segmentation?
- A. By encrypting data traffic between VLANs.
- B. By ensuring the same IP address range can be used in different VLANs.
- C. By providing a backup path for data in case of link failure.
- D. By enabling the identification and separation of traffic belonging to different VLANs.
正解：D
質問 # 63
Fill in the blank: In BGP, the ___________ attribute is used to influence the best path selection process.
- A. AS_PATH
- B. Community
- C. Local Preference
- D. MED (Metric or Multi-Exit Discriminator)
正解：D
質問 # 64
What is the purpose of using route reflectors in BGP?
- A. To reduce the number of required IBGP sessions in a network
- B. To automatically select the best route
- C. To increase the speed of BGP convergence
- D. To encrypt BGP messages
正解：A
質問 # 65
Which of the following BGP attributes is considered first in the route selection process?
- A. AS Path Length
- B. Origin
- C. MED
- D. Local Preference
正解：D
質問 # 66
When configuring High Availability components, which of the following practices are recommended? (Choose two)
- A. Implement regular testing of failover mechanisms.
- B. Use a single path for data and control traffic.
- C. Regularly update firmware to non-recommended versions.
- D. Ensure physical redundancy of critical components.
正解：A、D
質問 # 67
Which two statements are correct about BGP? (Choose two.)
- A. IBGP sessions are typically established between physical router interfaces.
- B. EBGP sessions are typically established between router loopback interfaces.
- C. IBGP peers do not advertise routes learned from IBGP peers to other IBGP peers.
- D. EBGP uses the AS path to avoid loops.
正解：C、D
質問 # 68
Which of the following is an important consideration when configuring BFD?
- A. Setting a very high multiplier to avoid false positives
- B. Adjusting the BFD interval and multiplier according to network needs
- C. Disabling all other failure detection mechanisms
- D. Using the same BFD interval on all devices in the network
正解：B
質問 # 69
Which statement is correct about an IRB interface?
- A. An IRB interface switches traffic within the same VLAN.
- B. An IRB interface is a Layer 3 interface that can be used to route between VLANs.
- C. An IRB interface trunks together VLANs on different switches.
- D. An IRB interface is a physical Layer 3 interface that connects VLANs together.
正解：B
解説：
AnIRB (Integrated Routing and Bridging)interface provides routing functionality between VLANs at Layer 3, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
* IRB Functionality:
* The IRB interface enables routing between different VLANs by acting as a Layer 3 gateway.
Traffic within the same VLAN is handled by Layer 2 switching, while traffic between VLANs is routed through the IRB interface.
* Layer 3 Routing Between VLANs:
* Each VLAN can be assigned an IP address on the IRB interface, which allows traffic to flow between VLANs based on Layer 3 IP routing.
Juniper Reference:
* IRB Interface Configuration: Juniper supports IRB for inter-VLAN routing on devices like the EX and QFX series switches, facilitating Layer 3 communication in data centers.
質問 # 70
What is the primary purpose of using static routes in a network?
- A. To automatically adjust routes based on network traffic
- B. To provide a manually configured routing entry
- C. To aggregate multiple routes into one
- D. To generate routing entries dynamically
正解：B
質問 # 71
Which statement is correct about areas in OSPF?
- A. OSPF areas are used to reduce the size of the link-state database.
- B. An OSPF area is used to signify the autonomous system to which each device belongs.
- C. An OSPF area is used to segment Layer 2 broadcast domains.
- D. OSPF areas are used to isolate the effects of a broadcast storm.
正解：A
解説：
InOSPF (Open Shortest Path First), areas are used to segment a network into smaller, more manageable pieces to improve scalability. By dividing a network into areas, OSPF can reduce the size of thelink-state database (LSDB), which helps routers process updates more efficiently.
Step-by-Step Breakdown:
* Purpose of OSPF Areas:OSPF areas allow for hierarchical routing within the OSPF domain. Routers in the same area have identical LSDBs, but routers in different areas do not exchange full link-state information. Instead, they exchange summarized routes, which reduces the LSDB size and CPU
/memory usage.
* Benefits:Reducing the LSDB size improves scalability and ensures faster convergence in larger networks. Area 0 is the backbone area, and all other areas must connect to it, forming a hierarchical structure.
Juniper Reference:
* OSPF Configuration: Areas in OSPF are configured to optimize network performance by limiting the scope of link-state advertisements (LSAs) to within an area.
質問 # 72
In a Spine/Leaf IP-Fabric architecture, what is the primary role of the leaf switches?
- A. To manage the overall data center network.
- B. To provide direct connectivity to servers.
- C. To perform deep packet inspection.
- D. To interconnect different data centers.
正解：B
質問 # 73
Which of the following are correct about OSPF router ID selection? (Choose two)
- A. It is chosen based on the highest IP address of any active interface by default.
- B. It can be manually configured.
- C. It is always the IP address of the loopback interface.
- D. It is selected based on the lowest MAC address.
正解：A、B
質問 # 74
What are two characteristics of a typical EBGP underlay fabric? (Choose two.)
- A. An EBGP fabric does not require an IGP to advertise loopback IPs.
- B. An EBGP fabric relies on an IGP to advertise loopback IPs.
- C. Each device in an EBGP fabric will be configured to be part of the same private AS.
- D. Each device in an EBGP fabric will be configured in its own unique private AS.
正解：A、D
質問 # 75
When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)
- A. The BFD default multiplier is 5.
- B. The BFD default minimum interval is 3.
- C. The BFD operation always consists of minimum intervals and multipliers.
- D. You can configure BFD per interface within the protocol stanza.
正解：C、D
質問 # 76
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Juniper JN0-280認定試験は、データセンター分野で働く個人にとって重要な資格です。認定試験では、データセンターテクノロジーに関連する広範なトピックをカバーし、候補者の異なるデータセンターテクノロジーの設定、管理、トラブルシューティング能力をテストします。候補者は、Juniperが提供するトレーニングコースを受講するか、学習資料と練習試験を使用して自己学習することによって試験の準備ができます。この認定は、データセンター分野でキャリアを構築する個人にとって貴重な資格です。
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