Juniper JN0-351最新対策問題、JN0-351日本語関連対策

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Juniper JN0-351 Exam Syllabus Topics:

Section	Objectives
Topic 1: Spanning Tree Protocol	- STP, RSTP, MSTP concepts and operation - Configuration, monitoring and troubleshooting - Root bridge, port roles and states
Topic 2: IS-IS	- Configuration, monitoring and troubleshooting - IS-IS concepts, levels, routing information
Topic 3: Layer 2 Switching and VLANs	- Inter-VLAN routing - Layer 2 switching concepts and operation - Configuration, monitoring and troubleshooting - VLAN concepts, tagging, ports, native VLAN
Topic 4: BGP	- BGP concepts, attributes, path selection - Configuration, monitoring and troubleshooting - IBGP, EBGP, route policies
Topic 5: Protocol Independent Routing	- Configuration, monitoring and troubleshooting - Routing policy and firewall filters - Static routes, aggregate routes - Routing tables, routing preferences
Topic 6: OSPF	- Neighbor relationships, route calculation - Configuration, monitoring and troubleshooting - OSPFv2/v3 concepts, areas, LSA types
Topic 7: High Availability	- Graceful restart, nonstop active routing - Configuration, monitoring and troubleshooting - Virtual Chassis, redundant routing engines
Topic 8: Tunnels	- Configuration, monitoring and troubleshooting - IP-IP, GRE, IPsec tunnels
Topic 9: Layer 2 Security	- Dynamic ARP inspection, DHCP snooping - Layer 2 firewall filters - Port security, storm control, MAC limiting - Configuration, monitoring and troubleshooting

>> Juniper JN0-351最新対策問題 <<

JN0-351日本語関連対策 & JN0-351認定資格試験問題集

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q156-Q161):

質問 # 156
Which statement is correct regarding OSPF designated router (DR) election on a multi-access network?

A. The DR election is based on the highest interface priority, with the router ID used as a tiebreaker.
B. The DR is manually configured and cannot be influenced by priority.
C. DR election only occurs on point-to-point networks.
D. The router with the lowest router ID is always elected DR.

正解：A

解説：
On OSPF multi-access networks, the Designated Router (DR) is elected based on the highest configured interface priority. If priorities are equal, the router with the highest router ID is elected.
A priority of 0 excludes a router from DR/BDR election entirely. DR election does not occur on point-to-point links since there is no need for a DR/BDR relationship on such segments.

質問 # 157
The ISP1.inet.0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?

A. The ISP1.inet.0 route table will be imported into the inet.0 route table.
B. The inet.0 route table will be completely overwritten by the ISP1.inet.0 route table.
C. The inet.0 route table will be imported into the ISP1.inet.0 route table.
D. The ISP1.inet.0 route table will be completely overwritten by the inet.0 route table.

正解：C

解説：
The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table. In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table.
This means that the routes from inet.0 will be imported into ispi.inet.0.

質問 # 158
What is the default MAC age-out timer on an EX Series switch?

A. 30 seconds
B. 300 minutes
C. 30 minutes
D. 300 seconds

正解：D

解説：
Explanation
The default MAC age-out timer on an EX Series switch is 300 seconds12. The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed31. This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces1. When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces1.

質問 # 159
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of 192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?

A. R1 will be the BDR.
B. R2 will be the BDR.
C. Router IDs must match for an adjacency to form.
D. At least three routers are required for a DR/BDR election.

正解：B

解説：
In OSPF, a DR (Designated Router) and a BDR (Backup Designated Router) are elected on each multi-access network, such as Ethernet or Frame Relay. The DR and BDR are responsible for exchanging routing information with other routers on the same network segment. The election is based on two criteria: the OSPF priority and the router ID. The router with the highest priority becomes the DR, and the router with the second-highest priority becomes the BDR. If the priorities are equal, the router with the highest router ID becomes the DR, and the router with the second-highest router ID becomes the BDR. The default priority is 1, and the router ID is either manually configured or derived from the highest IP address on any interface12.
In this scenario, R1 has a priority of 32 and a router ID of 192.168.1.2, and R2 has a priority of 64 and a router ID of 192.168.1.1. Since R2 has a higher priority than R1, it will become the BDR. The router ID does not matter in this case, because the priority is different. Therefore, the correct answer is C.
The other options are not correct because:
A). At least two routers are required for a DR/BDR election, not three2.
B). Router IDs do not have to match for an adjacency to form, they just have to be unique3.
D). R1 will not be the BDR, because it has a lower priority than R212.
References: Understanding OSPF Areas | Junos OS, OSPF DR/BDR Election explained - NetworkLessons.
com, OSPF adjacency - Cisco Community

質問 # 160
Which two statements about MACsec are true? (Choose two.)

A. MACsec is an IEEE standard.
B. MACsec functions on point-to-point connections.
C. MACsec functions on point-to-multipoint connections.
D. MACsec does not provide data integrity.

正解：A、C

質問 # 161
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