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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Specialist (JNCIS-ENT) |
| Exam Number: | JN0-351 |
| Available Languages: | English |
| Passing Score: | Not specified (Pass/Fail status available immediately) |
| Real Exam Qty: | 65 |
| Certificate Validity Period: | 3 years |
| Exam Format: | Multiple-choice questions |
| Exam Price: | $300 USD |
| Exam Duration: | 90 minutes |
| Related Certifications: | JNCIS-ENT |
| Sample Questions: | Juniper JN0-351 Sample Questions |
| Exam Way: | Pearson VUE testing centers (In-person) |
| Pre Condition: | Recommended: JNCIA-Junos certification |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html |
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質問 # 66
Exhibit.
Which router will become the OSPF BDR if all routers are powered on at the same time?
正解：B
解説：
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 network 1 .
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 interface 2 .
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 Tuning 2 : OSPF Designated Router (DR) and Backup Designated Router (BDR)
質問 # 67
What does the * indicate in the output shown in the exhibit?
正解：B
解説：
The exhibit shows the output of the command show vlans brief, which displays brief information about VLANs and their associated interfaces.
The output has four columns: Routing instance, VLAN name, Interfaces, and Tagging. The * symbol indicates that the interface is active, meaning that it is up and forwarding traffic. This can be verified by the command show interfaces terse, which displays the status of the interfaces.
質問 # 68
Which statement correctly describes the difference between a BA classifier and a multifield (MF) classifier in Junos OS CoS?
正解：D
解説：
While a behavior aggregate (BA) classifier assigns forwarding class and loss priority based on a single field such as DSCP or 802.1p bits, a multifield (MF) classifier, implemented using firewall filter match conditions, can classify traffic based on multiple packet attributes, including source/destination IP address, port numbers, and protocol, in addition to any existing CoS markings, providing much finer-grained classification control.
質問 # 69
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?
正解：D
解説：
Explanation
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 generated1. If the switch has been configured with the port-error-disable statement, the disabled interface recovers automatically upon expiration of the specified disable timeout1. However, if the switch has not been configured for auto-recovery from port error disabled conditions, you must manually clearthe violation by running the clear ethernet-switching port-error command for the interface to send and receive traffic again1. This explanation is based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks1.
質問 # 70
An EBGP session sources its TCP connection from which IP address?
正解：A
質問 # 71
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