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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam |
| Exam Number: | JN0-351 |
| Related Certifications: | JNCIA-Junos JNCIE-ENT JNCIP-ENT |
| Available Languages: | English |
| Exam Price: | $200 USD |
| Exam Duration: | 90 minutes |
| Passing Score: | Not publicly disclosed (approx. 65%-70%) |
| Exam Format: | Multiple Choice |
| Real Exam Qty: | 65 |
| Certificate Validity Period: | 3 years |
| 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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NEW QUESTION # 168
Exhibit
You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?
Answer: D
Explanation:
Explanation
A keepalive OAM probe is a mechanism that can be used to monitor the state of a GRE tunnel and detect any failures in the tunnel path. A keepalive OAM probe consists of sending periodic packets from one end of the tunnel to the other and expecting a reply. If no reply is received within a specified time, the tunnel is considered down and the line protocol of the tunnel interface is changed to down1.
To configure a keepalive OAM probe for a GRE tunnel, you need to specify two parameters: the keepalive-time and the hold-time. The keepalive-time is the interval between each keepalive packet sent by the local router. The hold-time is the maximum time that the local router waits for a reply from the remote router before declaring the tunnel down2.
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel2. This is because the hold-time value must account for both the round-trip time of the keepalive packet and the processing time of the remote router. If the hold-time value is too small, it may cause false positives and unnecessary tunnel flaps.
In the exhibit, the configuration shows that the keepalive-time is set to 10 seconds and the hold-time is set to
15 seconds for the gr-1/1/10.1 interface. This means that the local router will send a keepalive packet every 10 seconds and will wait for 15 seconds for a reply from the remote router. However, this hold-time value is not two times the keepalive-time value, which violates the recommended configuration. This may cause traffic drops if the remote router takes longer than 15 seconds to reply.
Therefore, option D is correct, because the hold-time value must be two times the keepalive-time value for a GRE tunnel. Option A is incorrect, because BFD is not required for GRE tunnels; BFD is another protocol that can be used to monitor tunnels, but it is not compatible with GRE keepalives3. Option B is incorrect, because the "event link-adjacency-loss" option is not related to GRE tunnels; it is an option that can be used to trigger an action when a link goes down4. Option C is incorrect, because LLDP does not need to be removed from the gr-1/1/10.1 interface; LLDP is a protocol that can be used to discover neighboring devices and their capabilities, but it does not interfere with GRE tunnels5.
References:
1: Configuring Keepalive Time and Hold time for a GRE Tunnel Interface 2: keepalive | Junos OS | Juniper Networks 3: Configuring Bidirectional Forwarding Detection 4: event link-adjacency-loss | Junos OS | Juniper Networks 5: Understanding Link Layer Discovery Protocol
NEW QUESTION # 169
Which two actions are performed by the firewall filter shown in the exhibit? (Choose two.)
Answer: A,D
Explanation:
References:
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Juniper Networks Certified Specialist, Enterprise Routing & Switching ...
* Juniper Networks Certified Specialist, Enterprise Routing & Switching ...
* [Configuring Layer 2 Firewall Filters - TechLibrary - Juniper Networks]
* [Understanding Firewall Filter Terms - TechLibrary - Juniper Networks]
NEW QUESTION # 170
Referring to the exhibit, the local router should have an IS-IS adjacency with a neighboring router, but the adjacency never establishes correctly.
What should you do to solve the problem?
Answer: A
NEW QUESTION # 171
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)
Answer: A,D
Explanation:
The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information 1
. This database is used to filter and validate DHCP messages from untrusted sources 1 .
However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:
* MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping. MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks 1 . This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.
* Static IP address : If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database
1 . The DHCP snooping feature relies on monitoring DHCP messages to build its database 1 , so devices with static IP addresses that do not send DHCP messages will not have their information added.
Therefore, options B and C are correct. Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database 1 , and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created 1 .
NEW QUESTION # 172
Click the Exhibit button.
You have configured a GRE interface, but no traffic will flow.
Referring to the exhibit, which statement is true?
Answer: D
Explanation:
According to the Juniper documentation 1 , the source and destination addresses of a GRE tunnel interface must be in different subnets. If they are in the same subnet, the router will not be able to route the GRE packets correctly. In the exhibit, the source and destination addresses are both in the 192.168.197.0/24 subnet, which is invalid for GRE tunneling. Therefore, the correct answer is D. References: Configuring GRE Tunnel Interfaces | Junos OS
NEW QUESTION # 173
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