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Juniper JN0-351試験のAPPテストエンジンは、ほとんどの認定候補者がファッションであり、この新しい学習方法に簡単に適応できるため、少なくとも60％の受験者に人気があります。 JN0-351試験のAPPテストエンジンは、いつでもどこでも使用できると考える人がいます。 また、候補者の一部は、このバージョンでは実際のテストで実際のシーンをシミュレートできると考えています。 ブラウザを開くことができれば、学ぶことができます。 また、オフラインで学習したい場合は、JN0-351試験のAPPテストエンジンをダウンロードしてインストールした後、キャッシュをクリアしないでください。
質問 # 54
Which statement correctly describes the BGP attribute Local Preference?
正解：A
解説：
Local Preference is a well-known BGP attribute used only within an autonomous system (it is not advertised to eBGP peers) to influence the outbound path selection for traffic leaving the AS.
Among multiple paths to the same destination, the path with the higher Local Preference value is preferred by all routers within the AS.
質問 # 55
Which two events cause a router to advertise a connected network to OSPF neighbors? (Choose two.)
正解：B、D
解説：
A is correct because when an OSPF adjacency is established, a router will advertise a connected network to OSPF neighbors. An OSPF adjacency is a logical relationship between two routers that agree to exchange routing information using the OSPF protocol1. To establish an OSPF adjacency, the routers must be in the same area, have compatible parameters, and exchange hello packets1. Once an OSPF adjacency is formed, the routers will exchange database description (DBD) packets, which contain summaries of their link-state databases (LSDBs)1. The LSDBs include information about the connected networks and their costs2. Therefore, when an OSPF adjacency is established, a router will advertise a connected network to OSPF neighbors through DBD packets.
D is correct because when a static route to the 224.0.0.5 address is created, a router will advertise a connected network to OSPF neighbors. The 224.0.0.5 address is the multicast address for all OSPF routers3. A static route to this address can be used to send OSPF hello packets to all OSPF neighbors on a network segment3. This can be useful when the network segment does not support multicast or when the router does not have an IP address on the segment3. When a static route to the 224.0.0.5 address is created, the router will send hello packets to this address and establish OSPF adjacencies with other routers on the segment3. As explained above, once an OSPF adjacency is formed, the router will advertise a connected network to OSPF neighbors through DBD packets.
質問 # 56
Exhibit.
You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?
正解：B
解説：
* The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp
. This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP 1 . This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence 2 .
* The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches 3 . Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning: STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor 1 .
* To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode 1 .
質問 # 57
You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)
正解：B、D
解説：
The AS path attribute shows AS numbers (e.g., 65401 65520.), indicating the route's traversal through one or various autonomous systems.
The output displays the selected routes and the attributes with which they were received, but does not show the effects of import policy on the routing attributes.
Nothing indicates that the routes have been received from an IBGP peer. The asterisks only indicates whether the routes have been imported into the routing table (RIB) after the application of the import policies.
https://www.juniper.net/documentation/us/en/software/junos/cli-
reference/topics/ref/command/show-route-receive-protocol.html
質問 # 58
Exhibit.
Which router will become the OSPF BDR if all routers are powered on at the same time?
正解：A
解説：
Explanation
OSPF DR/BDR election is a process that occurs on multi-access data links. It is intended to select two OSPF nodes: one to be acting as the Designated Router (DR), and another to be acting as the Backup Designated Router (BDR).The DR and BDR are responsible for generating network LSAs for the multi-access network and synchronizing the LSDB with other routers on the same network1.
The DR/BDR election is based on two criteria: the OSPF priority and the router ID. The OSPF priority is a value between 0 and 255 that can be configured on each interface participating in OSPF. The default priority is
1. A priority of 0 means that the router will not participate in the election and will never become a DR or BDR. The router with the highest priority will become the DR, and the router with the second highest priority will become the BDR. If there is a tie in priority, then the router ID is used as a tie-breaker. The router ID is a
32-bit number that uniquely identifies each router in an OSPF domain.It can be manually configured or automatically derived from the highest IP address on a loopback interface or any active interface2.
In this scenario, all routers have the same priority of 1, so the router ID will determine the outcome of the election. The router IDs are shown in the exhibit as RID values. The highest RID belongs to R4 (10.10.10.4), so R4 will become the DR. The second highest RID belongs to R3 (10.10.10.3), so R3 will become the BDR.
References:
1:OSPF DR/BDR Election: Process, Configuration, and Tuning2:OSPF Designated Router (DR) and Backup Designated Router (BDR)
質問 # 59
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