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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	レイヤー 2 スイッチングまたは VLAN: このトピックでは、VLAN の概念と利点を含む、Junos OS 内のレイヤー 2 スイッチング操作についての理解を深めます。経験豊富なネットワークプロフェッショナルは、ネットワークのセグメンテーションと効率化に不可欠な構成、監視、およびトラブルシューティングのテクニックについて理解を深めます。
トピック 2	高可用性: このトピックでは、Junos OS 環境における高可用性の重要性と適用について説明します。これらのコンポーネントの構成と管理に関する知識は、試験の期待に沿って、堅牢で中断のないネットワーク運用を保証するために不可欠です。
トピック 3	トンネル: IP トンネリングの基礎に重点を置き、その要件と機能について重点的に説明します。トンネルの構成、監視、トラブルシューティングを習得することで、専門家は JN0-351 試験の要求を満たすことができます。
トピック 4	BGP: このトピックでは、エンタープライズネットワークの基礎となる BGP の運用要素と概念要素に焦点を当てます。

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q190-Q195):

質問 # 190
Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)

A. You can deploy only stateless firewall filters on an EX Series switch.
B. You can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.
C. You can deploy both stateless and stateful firewall filters on an EX Series switch.
D. You can only apply firewall filters to Layer 2 traffic on an EX Series switch.

正解：A、B

解説：
* A is correct because you can deploy only stateless firewall filters on an EX Series switch. A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers 1 . A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or session information
1 . EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters 2 .
* C is correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch. Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks 3 . EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer 3) firewall filters 4 . You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.

質問 # 191
Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems?
(Choose two.)

A. EBGP routers will prepend their AS number when advertising routes to their neighbors
B. EBGP routers will append their AS number when advertising routes to their neighbors.
C. EBGP routers will drop routes that contain their own AS number in the AS_PATH
D. EBGP routers will only accept routes that contain their own AS number in the AS_PATH.

正解：B、C

解説：
Explanation
BGP (Border Gateway Protocol) is a protocol designed to exchange routing and reachability information among autonomous systems (AS) on the internet1.
Option A is correct. When an EBGP router advertises routes to its neighbors, it appends its AS number to the AS_PATH attribute1. This is a key mechanism in BGP to prevent routing loops1.
Option C is correct. BGP has a built-in loop prevention mechanism whereby if a BGP router detects its own AS in the AS_PATH attribute, it will drop the prefix and will not continue to advertise it2. This helps to prevent routing loops2.
Option B is incorrect. EBGP routers do not accept routes that contain their own AS number in the AS_PATH2. Instead, they drop such routes as part of the loop prevention mechanism2.
Option D is incorrect. While it's true that EBGP routers append their AS number when advertising routes, they do not prepend their AS number1. The term "prepend" in BGP usually refers to a technique used to influence path selection by artificially lengthening the AS_PATH3.

質問 # 192
You implemented the MAC address limit feature with the shutdown action on all interfaces on your switch.
In this scenario, which statement is correct when a violation occurs?

A. By default, devices that are learned before the violation occurs are still allowed to send and receive traffic through the specific interface.
B. By default, you must manually clear the violation for the interface to send and receive traffic again.
C. By default, the interface will continue to send and receive traffic for all connected devices after a violation has occurred.
D. By default, the violation will automatically be cleared after 300 seconds and the interface will resume sending and receiving traffic for all learned devices.

正解：B

解説：
When the MAC address limit feature with the shutdown action is implemented on a switch, if a violation occurs, the interface is disabled and a system log entry is generated 1 . If the switch has been configured with the port-error-disable statement, the disabled interface recovers automatically upon expiration of the specified disable timeout 1 . However, if the switch has not been configured for auto-recovery from port error disabled conditions, you must manually clear the violation by running the clear ethernet-switching port-error command for the interface to send and receive traffic again 1 . This explanation is based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks 1 .

質問 # 193
Which three actions are required for filter-based forwarding? (Choose three.)

A. Create a RIB group for next-hop entries.
B. Create routing instances for individual destinations.
C. Create routing policies for source addresses.
D. Create a firewall filter to match desired traffic.
E. Create a forwarding option for load balancing.

正解：A、C、D

質問 # 194
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

A. Layer 2 control traffic is permitted on the secondary link.
B. If the active link fails, then the secondary link automatically takes over.
C. Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.
D. Redundant trunk groups load balance traffic across two designated uplink interfaces.

正解：A、B

解説：
Redundant trunk groups are designed to provide link redundancy. If the primary link fails, the secondary link will automatically take over to ensure continued connectivity.
In redundant trunk groups, while regular data traffic is sent over the primary link, Layer 2 control traffic (such as STP, LACP, etc.) is allowed on the secondary link to maintain network stability and protocol operations.
https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic- map/redundant-trunk-groups.html

質問 # 195
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