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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam |
| Exam Number: | JN0-351 |
| Exam Format: | Multiple Choice |
| Available Languages: | English |
| Exam Price: | $200 USD |
| Certificate Validity Period: | 3 years |
| Related Certifications: | JNCIA-Junos JNCIE-ENT JNCIP-ENT |
| Real Exam Qty: | 65 |
| Passing Score: | Not publicly disclosed (approx. 65%-70%) |
| Exam Duration: | 90 minutes |
| Recommended Training: | Juniper Learning Portal |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Juniper JN0-351 Sample Questions |
| Exam Way: | Online proctored or onsite testing center (Pearson VUE) |
| Pre Condition: | Valid 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 # 69
Exhibit
You are receiving the BGP route shown in the exhibit from four different upstream ISPs.
Referring to the exhibit, which ISP will be selected as the active path?
正解：A
解説：
Explanation
In BGP, the path selection process is based on a set of attributes1. The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on1. If all these attributes are the same, then it prefers the path with the shortest AS path1.
Referring to the exhibit, all four ISPs have the same weight, local preference, and origin1. However, ISP 4 has the shortest AS path1. Therefore, ISP 4 will be selected as the active path. So, option C is correct.
質問 # 70
Which two statements are correct about tunnels? (Choose two.)
正解：A、B
解説：
A tunnel is a connection between two computer networks, in which data is sent from one network to another through an encrypted link. Tunnels are commonly used to secure data communications between two networks or to connect two networks that use different protocols.
Option B is correct, because tunnel endpoints must have a valid route to the remote tunnel endpoint. A tunnel endpoint is the device that initiates or terminates a tunnel connection. For a tunnel to be established, both endpoints must be able to reach each other over the underlying network. This means that they must have a valid route to the IP address of the remote endpoint 1 .
Option D is correct, because tunnels add additional overhead to packet size. Tunnels work by encapsulating packets: wrapping packets inside of other packets. This means that the original packet becomes the payload of the surrounding packet, and the surrounding packet has its own header and trailer. The header and trailer of the surrounding packet add extra bytes to the packet size, which is called overhead. Overhead can reduce the efficiency and performance of a network, as it consumes more bandwidth and processing power 2 .
Option A is incorrect, because BFD can be used to monitor tunnels. BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery. BFD can also be used to monitor the connectivity of tunnels, such as GRE, IPsec, or MPLS.
Option C is incorrect, because IP-IP tunnels are stateless. IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels are stateless, which means that they do not keep track of the state or status of the tunnel connection. Stateless tunnels do not require any signaling or negotiation between the endpoints, but they also do not provide any error detection or recovery mechanisms.
References:
1 : What is Tunneling? | Tunneling in Networking 2 : What Is Tunnel In Networking, Its Types, And Its Benefits? : [Configuring Bidirectional Forwarding Detection] : [IP-IP Tunneling]
質問 # 71
Which statement is correct regarding link aggregation groups (LAGs) in Junos OS?
正解：D
解説：
A Link Aggregation Group (LAG) bundles multiple physical Ethernet links into a single logical interface (ae interface in Junos), increasing available bandwidth and providing redundancy in case one member link fails. While LACP (Link Aggregation Control Protocol) is commonly used to dynamically negotiate and monitor the aggregated links, static LAGs without LACP are also supported.
質問 # 72
Referring to the exhibit, what will be the IS-IS adjacency result of the configurations?
正解：A
質問 # 73
Exhibit
What does the * indicate in the output shown in the exhibit?
正解：D
解説：
* The exhibit shows the output of the command show vlans brief , which displays brief information about VLANs and their associated interfaces 1 .
* 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 1 . This can be verified by the command show interfaces terse , which displays the status of the interfaces 2 .
質問 # 74
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