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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Specialist (JNCIS-ENT) |
| Exam Number: | JN0-351 |
| Passing Score: | ~60-70% |
| Exam Format: | Multiple choice, Multiple-answer multiple choice, Single-answer multiple choice |
| Exam Price: | USD varies by region (typically around $200โ$300 USD) |
| Related Certifications: | JNCIP-ENT JNCIA-Junos JNCIE-ENT |
| Real Exam Qty: | 65 |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Recommended Training: | Juniper Enterprise Routing & Switching Training Juniper Learning Portal |
| Exam Registration: | Juniper Certification Registration Pearson VUE Juniper Exams |
| Sample Questions: | Juniper JN0-351 Sample Questions |
| Exam Way: | Pearson VUE proctored exam (online or test center) |
| Pre Condition: | JNCIA-Junos (JN0-105) recommended as prerequisite knowledge |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/certification-tracks/enterprise-routing-switching/jncis-ent.html |
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NEW QUESTION # 184
You are deploying a trunk port with multiple VLANs.
In this scenario, which statement is true about the native VLAN?
Answer: D
Explanation:
In a trunk port configuration with multiple VLANs, the native VLAN carries untagged traffic. This means frames sent or received on the port without a VLAN tag are automatically assigned to the native VLAN.
Here ' s why the other options are incorrect:
* A. The native VLAN must be the default VLAN on the port. This is not necessarily true. The native VLAN and the default VLAN can be different. The default VLAN is the VLAN assigned to untagged traffic on access ports, while the native VLAN applies to trunk ports.
* B. The native VLAN is automatically configured through DHCP. This is incorrect. The native VLAN needs to be manually configured on the switch port. DHCP is used for assigning IP addresses, not VLAN IDs.
* D. The native VLAN is the highest tagged VLAN ID on the port. This is also incorrect. The native VLAN and tagged VLANs are independent. The native VLAN is not related to the highest or lowest tagged VLAN ID.
Therefore, the only true statement is that the native VLAN is an untagged VLAN ID on the port.
:
Trunk Ports and VLANs: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-
0_2_EX/vlan/configuration_guide/b_vlan_152ex_2960-x_cg/b_vlan_152ex_2960-x_cg_chapter_0100.pdf Configuring Trunk Ports: https://community.cisco.com/t5/networking-knowledge-base/how-to-define-the- vlans-allowed-on-a-trunk-link/ta-p/3131083 Understanding Native VLANs: https://www.practicalnetworking.net/tag/vlans/
NEW QUESTION # 185
Which statement about configuring persistent MAC learning is correct?
Answer: C
NEW QUESTION # 186
Which two statements are correct about the BGP MED (Multi-Exit Discriminator) attribute?
(Choose two.)
Answer: B,D
Explanation:
The Multi-Exit Discriminator (MED) is used to suggest a preferred entry point into an AS when there are multiple connections to a neighboring AS. A lower MED value is preferred over a higher one. MED is a non-transitive, optional attribute typically exchanged between eBGP peers, and by default it is only compared between routes learned from the same neighboring AS.
NEW QUESTION # 187
Which two statements are correct about IS-IS? (Choose two.)
Answer: A,D
NEW QUESTION # 188
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)
Answer: B,D
Explanation:
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device 1 .
A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet-switching 2 . The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term 3 .
To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer 3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks 4 .
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface.
Option A is incorrect, because you should not create a family ethernet-switching firewall filter with the appropriate match criteria and actions. A family ethernet-switching firewall filter is used to evaluate Layer 2 traffic on a Juniper device. A family ethernet-switching firewall filter can only match on MAC addresses or VLAN IDs, not on IP addresses or protocols 5 .
Option B is incorrect, because you should not apply the firewall filter to the appropriate VLAN. A VLAN is a logical grouping of hosts that share the same broadcast domain on a Layer 2 network. A VLAN does not have an IP address or routing capability. A firewall filter cannot be applied directly to a VLAN; it must be applied to an interface that belongs to or connects to the VLAN 6 .
References:
1 : Firewall Filters Overview 2 : Configuring Firewall Filters 3 : Configuring Firewall Filter Match Conditions and Actions 4 : Understanding Integrated Routing and Bridging Interfaces 5 : Configuring Ethernet-Switching Firewall Filters 6 : Understanding VLANs
https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/task/firewall-filter-qfx- series-cli.html
NEW QUESTION # 189
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