Vendor: Juniper
Certifications: Juniper Certifications
Exam Code: JN0-351
Exam Name: Enterprise Routing and Switching, Specialist (JNCIS-ENT)
Updated: May 29, 2026
Q&As: 175 ( View Details)
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Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)
A. Redundant trunk groups load-balance traffic across two designated uplink interfaces.
B. If the active link fails, then the secondary link automatically takes over.
C. Layer 2 control traffic is permitted on the secondary link
D. Redundant trunk groups must be connected to the same aggregation switch.
Correct Answer: BD
Explanation: Redundant Trunk Groups (RTGs) on EX Series switches provide a simple solution for network recovery when a trunk port on a switch goes down1. They are configured on the access switch and contain two links: a primary or
active link, and a secondary link1. Therefore, option B is correct because if the active link fails, the secondary link automatically starts forwarding data traffic without waiting for normal spanning-tree protocol convergence1.
Option D is also correct. In a typical enterprise network composed of distribution and access layers, RTGs are used where one Access switch is connected to two different uplink switches2. This implies that RTGs must be connected to the
same aggregation switch2.
An update to your organization's network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.
Which two commands enable this behavior? (Choose two.)
A. set routing--instances mgmtjunoa interface ge-0/0/0.0
B. set routing--instances mgmt_junos interface em1
C. set system management--instance
D. set routing--instances mgmt_junos
Correct Answer: CD
Explanation: To isolate management traffic in a non-default routing-instance on Junos- based devices, you can use the set system management-instance and set routing- instances mgmt_junos commands12.
set system management-instance: This command associates the management interface (usually named fxp0 or em0 for Junos OS, or re0:mgmt-* or re1:mgmt-* for Junos OS Evolved) with the non-default virtual routing and forwarding (VRF)
instance1. After you configure the non-default management VRF instance, management traffic no longer has to share a routing table with other control traffic or protocol traffic1.
set routing-instances mgmt_junos: This command creates a new routing instance named mgmt_junos. The name of the dedicated management VRF instance is reserved and hardcoded as mgmt_junos; you cannot configure any other routing
instance by the name mgmt_junos1.
Therefore, options C and D are correct. Options A and B are not correct because they attempt to assign an interface to the mgmt_junos routing instance, which is not necessary for isolating management traffic1.
You deployed a new EX Series switch with DHCP snooping enabled and you do not see any entries in the snooping databases for an interface. Which two Juniper configurations for that interface caused this issue? (Choose two.)
A. The interface is configured as a disabled port.
B. MAC limiting is enabled on the interface.
C. The interface is configured as a trunk port.
D. Dynamic ARP inspection is enabled on the interface.
Correct Answer: AC
A is correct because the interface is configured as a disabled port. A disabled port does not forward any traffic, including DHCP packets. Therefore, DHCP snooping cannot learn any MAC addresses or lease information from a disabled port1. C is correct because the interface is configured as a trunk port. By default, all trunk ports on the switch are trusted for DHCP snooping2. This means that DHCP snooping does not inspect or filter any DHCP packets received on a trunk port. Therefore, DHCP snooping does not add any entries to the snooping database for a trunk port2.
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