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Juniper JN0-349 Exam
Enterprise Routing and Switching, Specialist (Page 2 )

Updated On: 26-Jan-2026
Page 2 of 21
PDF with 110 Questions

What are two benefits of 802.3ad link aggregation? (Choose two)

  1. It increases bandwidth
  2. It ensures symmetrical paths
  3. It simplifies interface configuration.
  4. It creates physical layer redundancy.

Answer(s): A,D

Explanation:

Aggregating multiple links between physical interfaces creates a single logical point-to-point trunk link or a LAG. The LAG balances traffic across the member links within an aggregated Ethernet bundle and effectively increases the uplink bandwidth. Another advantage of link aggregation is increased availability, because the LAG is composed of multiple member links. If one member link fails, the LAG continues to carry traffic over the remaining links.


Reference:

https://www.juniper.net/documentation/us/en/software/junos/interfaces-ethernet- switches/topics/topic-map/switches-interface-aggregated.html



Which statement is true about Layer 2 firewall filters on EX Series switches?

  1. They are stateless and evaluated by the control plane.
  2. They are stateless and evaluated by the forwarding plane.
  3. They are stateful and evaluated by the forwarding plane.
  4. They are stateful and evaluated by the control plane.

Answer(s): B



Which two statements about DHCP snooping are correct? (Choose two.)

  1. DHCP snooping inspects all DHCP packets on untrusted ports.
  2. DHCP snooping uses ARP to add statically defined IP addresses to its database.
  3. The DHCP database maps IP addresses. MAC addresses, and the associated VLAN.
  4. By default, the Junos OS treats access ports as trusted and trunk ports as untrusted.

Answer(s): A,C



Which two statements describe NSR? (Choose two

  1. NSR provides high availability with multiple Routing Engines.
  2. NSR rapidly detects link failures.
  3. NSR provides routing loop protection.
  4. NSR requires GRES to function properly.

Answer(s): A,D



Which statement about configuring persistent MAC learning is correct?

  1. Persistent MAC learning can be configured on access mode interfaces.
  2. Persistent MAC learning flushes dynamically learned MAC addresses on reboots.
  3. Persistent MAC learning cannot be configured on redundant trunk groups.
  4. Persistent MAC learning requires 802.1 X authentication.

Answer(s): A



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