JN0-348 Exam Prep Free – 50 Practice Questions to Get You Ready for Exam Day

Getting ready for the JN0-348 certification? Our JN0-348 Exam Prep Free resource includes 50 exam-style questions designed to help you practice effectively and feel confident on test day

Effective JN0-348 exam prep free is the key to success. With our free practice questions, you can:

• Get familiar with exam format and question style
• Identify which topics you’ve mastered—and which need more review
• Boost your confidence and reduce exam anxiety

Below, you will find 50 realistic JN0-348 Exam Prep Free questions that cover key exam topics. These questions are designed to reflect the structure and challenge level of the actual exam, making them perfect for your study routine.

You want to configure Layer 2 services over an IP-based tunneling mechanism between two sites.

Which configuration statement is required to accomplish this task?

A. set interfaces gr-0/0/0.0 family bridge
B. set interfaces ip-0/0/0.0 encapsulation vlan-bridge
C. set interfaces gr-0/0/0.0 encapsulation vlan-bridge
D. set interfaces ip-0/0/0.0 family bridge
 

Click the Exhibit button.

 

Both the R1 and R2 devices are advertising prefix X into AS 65530 with the BGP attributes shown in the exhibit.

Which statement is correct in this scenario?

A. R2's version of prefix X will be active because of the local preference attribute.
B. R1's version of prefix X will be active because of the local preference attribute.
C. R1's version of prefix X will be active because of the AS path attribute.
D. R2's version of prefix X will be active because of the AS path attribute.
 

You have configured the router with an IS-IS interface metric of 2048. However, the IS-IS interface metric of 63 is being applied for the interface of this router.

What must you do to enable the larger metric value?

A. Enable wide metrics.
B. Disable narrow metrics.
C. Restart the IS-IS protocol.
D. Enable level 1 IS-IS routing.
 

Click the Exhibit button.

 

Referring to the exhibit, Router-1 is attempting to form an EBGP session with Router-2. However, BGP routes are never exchanged between Router-1 and

Router-2.

What is causing the problem?

A. The TCP-MSS value is set too low
B. The EXT group is not configured as an external type BGP peering session
C. The EBGP session is configured to use the wrong AS
D. The keep all statement is preventing the session from establishing
 

Which two statements describe BGP attributes? (Choose two.)

A. BGP attributes help determine the best path to a destination.
B. The origin attribute indicates the autonomous systems through which the route has traversed.
C. BGP attributes are always optional.
D. The AS path attribute indicates the autonomous systems through which the route has traversed.
 

Referring to the exhibit, which configuration will force traffic to always use ae0.0 as long as it is active?

A.

 

B.

 

C.

 

D.

 

 

Which two port security features use the DHCP snooping database for additional port security? (Choose two.)

A. dynamic ARP inspection
B. MACsec
C. IP Source Guard
D. MAC learning
 

What are two characteristics of IS-IS CSNPs? (Choose two.)

A. IS-IS CSNPs contain header information for all link-state PDUs.
B. IS-IS CSNPs are used to request a copy of a missing link state PDU.
C. IS-IS CSNPs are used to maintain the link-state database synchronization.
D. IS-IS CSNPs contain header information for specific requested link-state PDUs.
 

Click the Exhibit button.

 

You are attempting to set up VRRP with R1 and R2 being participating members. You want R1 to be the master router and R2 to be the backup router with the virtual router they create being at address 172.25.100.1. The virtual router is not pinging from either User A or User B.

Referring to the exhibit, what must be done to correct the problem?

A. A VRRP policy is needed on R1 and R2.
B. The VRRP group value on R1 and R2 must match.
C. The VRRP priority value on R1 and R2 must match.
D. A VRRP authentication type value is needed on R1 and R2.
 

Which Junos feature allows you to combine multiple interfaces into a single bundle?

A. VRRP
B. Virtual Chassis
C. LAG
D. NSB
 

You want to use filter-based forwarding (FBF) to forward traffic sourced from subnet 10.0.0.0/24 to a specific destination.

Which two routing instance types would enable you to accomplish this task? (Choose two.)

A. virtual switch
B. virtual routing and forwarding
C. virtual router
D. forwarding
 

You want to advertise only a default route into a new area, which will be called area 7.

In this scenario, which configuration statement would solve this problem?

A. user@host# set protocols ospf area 0.0.0.7 nssa default-lsa default-metric 10
B. user@host# set protocols ospf area 0.0.0.7 stub no-summaries
C. user@host# set protocols ospf area 0.0.0.7 stub default-metric 10
D. user@host# set protocols ospf area 0.0.0.7 stub
 

Click the Exhibit button.

 

Referring to the exhibit, which router becomes the OSPF DR when all routers are powered on at the same time?

A. R3
B. R4
C. R1
D. R2
 

Click the Exhibit button.

 

Given the route shown in the exhibit, which two prefixes contribute to the aggregate route? (Choose two.)

A. 172.12.31.0/24
B. 172.12.33.0/24
C. 172.12.30.0/24
D. 172.12.32.0/24
 

Click the Exhibit button.

 

Referring to the exhibit, what is the problem?

A. The LAG member interfaces are configured across different line cards
B. LAG requires more than two member links
C. LACP is required for LAG to work
D. Aggregated interfaces must be defined under the chassis stanza
 

Which two statements are true about high availability on Junos devices? (Choose two.)

A. BFD is faster at detecting failures than default GRE or OSPF timers.
B. BFD is slower at detecting failures than default GRE or OSPF timers.
C. NSR is dependent on helper routers to assist the routing platform in restoring routing protocol information.
D. NSR is independent on helper routers to assist the routing platform in restoring routing protocol information.
 

Click the Exhibit button.

 

Referring to the output shown in the exhibit, which two statements are true?

A. The route is active
B. The route is not active
C. The route is a generate route
D. The route is an aggregate route
 

Which statement is true when using LAGs with an EX4300?

A. Speeds on member links can differ.
B. Member links must be contiguous.
C. Half duplex is supported on the LAG.
D. You can have up to 16 member links per LAG.
 

Click the Exhibit button.

 

Which statement is true about the configuration shown in the exhibit?

A. Only the local-pref import policy will be evaluated when routes are learned from neighbor 172.30.1.1
B. Only the add-community import policy will be evaluated when routes are learned from neighbor 172.30.1.1
C. No import policy will be evaluated when routes are learned from neighbor 172.30.2.1
D. Both the add-community and local-pref import policies will be evaluated when routes are learned from neighbor 172.30.2.1
 

What is the default BGP group type on a Junos device?

A. internal
B. external
C. multihop
D. null
 

Click the Exhibit button.

 

Referring to the exhibit, which two statements are correct? (Choose two.)

A. Router A does not send routes learned from Router E to Router B, Router C, and Router D
B. Router A sends routes learned from Router E to Router B, Router C, and Router D
C. Router A sends routes learned from Router D to Router B and Router C
D. Router A does not send routes learned from Router D to Router B and Router C
 

Your network is configured with dynamic ARP inspection (DAI) using the default parameters for all the DHCP and ARP related configurations. You just added a new device connected to a trunk port and configured it to obtain an IP address using DHCP.

Which two statements are correct in this scenario? (Choose two.)

A. The DHCP server assigns the IP addressing information to the new device.
B. DAI validates the ARP packets for the new device against the DHCP snooping database.
C. The ARP request and response packets for the new device will bypass DAI.
D. DHCP snooping adds the DHCP assigned IP address for the new device to its database.
 

Click the Exhibit button.

 

Referring to the exhibit, why is the route for 10.5.5.5 hidden?

A. It is a martian route.
B. It has an invalid community.
C. It is an L3VPN route.
D. The next hop cannot be resolved.
 

You added a new ESXi host connected to port ge-0/0/1. One of the VMs configured with VLAN 10 is not reachable from any other device on the switch. To troubleshoot, you decide to verify if the VM's MAC address is learned properly under VLAN 10.

Which command would you use in this scenario?

A. show ethernet-switching table vlan-id 10
B. show interfaces ge-0/0/1 detail
C. show vlans 10
D. monitor interface ge-0/0/1
 

You have a conference room with an open network port that is used by employees to connect to the network. You are concerned about rogue switches being connected to this port.

Which two features should you enable on your switch to limit access to this port? (Choose two.)

A. DHCP snooping
B. dynamic ARP inspection
C. MAC limiting
D. 802.1X
 

How many bytes of overhead are added to a packet traversing a GRE tunnel?

A. 20
B. 24
C. 12
D. 16
 

Click the Exhibit button.

 

Your router is configured to peer with your ISP's router using BGP. You can only control your BGP configuration.

Which address families are negotiated between the two BGP peers shown in the exhibit?

A. inet-unicast inet-vpn-unicast 12vpn-signaling
B. inet-unicast
C. inet-vpn-unicast
D. inet-unicast inet-vpn-unicast 12vpn
 

Which statement is true about IP-IP tunnels?

A. Intermediate devices must have a route to the destination address of the traffic being tunneled.
B. Intermediate devices must have a route to both the tunnel source address and the tunnel destination address.
C. Intermediate devices must have a route to the tunnel destination address but do not require a route to the tunnel source address.
D. Intermediate devices must have a route to the tunnel source address but do not require a route to the tunnel destination address.
 

Which two statements are correct regarding the root bridge election process when using STP? (Choose two.)

A. A lower system MAC address is preferred.
B. A higher bridge priority is preferred.
C. A lower bridge priority is preferred.
D. A higher system MAC address is preferred.
 

Click the Exhibit button.

 

Referring to the exhibit, all users connected to the same VLAN can communicate with each other, but not with users on other VLANs in this network.

What must be configured to enable communication between the VLANs?

A. The switch ports to which the users are connected should be configured as trunk ports.
B. A separate routing device is required to forward traffic between the configured VLANs.
C. A logical IRB interface must be created and assigned to each VLAN.
D. A single logical IRB interface must be created and assigned to all three VLANs.
 

Click the Exhibit button.

 

You want to prevent rogue BPDUs from lab devices reaching the internal through the Lab_Switch device.

Referring to the exhibit, what should be done to accomplish this task?

A. Configure the three lab ports as edge ports
B. Configure an input filter on interface xe-0/2/0 to discard the RSTP packets
C. Configure the three lab ports under the protocols layer2-control bpdu-block hierarchy on the switch
D. Configure protocols rstp with the bpdu-block-on-edge parameter for interface xe-0/2/0
 

Which statement about configuring persistent MAC learning is correct?

A. Persistent MAC learning requires 802.1X authentication.
B. Persistent MAC learning can be configured on access mode interfaces.
C. Persistent MAC learning flushes dynamically learned MAC addresses on reboots.
D. Persistent MAC learning cannot be configured on redundant trunk groups.
 

Click the Exhibit button.

 

In the exhibit, each IP subnet in the network is associated with a unique VLAN ID.

Which action will ensure that Host C will communicate with Host A and Host B?

A. Configure an IRB interface for each VLAN and associate it with its corresponding VLAN
B. Configure a port-based ACL that permits inter-VLAN routing for all configured VLANs
C. Configure all switch ports connecting to the host devices as trunk ports associated with all VLANs
D. Configure all switch ports connecting to the host devices as access ports associated with a common VLAN
 

Which mechanism is used to share routes between routing tables?

A. RIB groups
B. routing instances
C. forwarding instances
D. filter-based forwarding
 

You are adding a new EX4300 member switch to your existing EX4300 Virtual Chassis. However, the new member is not running the same Junos version as the other members.

By default, what is the expected behavior in this scenario?

A. the Virtual Chassis will transition into a split brain situation between the existing master Routing Engine and the switch running the different version.
B. The new switch will automatically pull the correct version from the master Routing Engine and perform the necessary upgrade.
C. The new switch will be assigned a member ID and then placed in an inactive state.
D. The new switch is not recognized by the Virtual Chassis.
 

When electing a DIS in an IS-IS network, what is used to break a priority tie?

A. highest MAC address
B. highest router ID
C. lowest MAC address
D. lowest router ID
 

When configuring firewall filters, which function does the interface-specific parameter enable on an EX Series switch?

A. The interface-specific parameter is required to configure port-specific counters.
B. The interface-specific parameter is required to configure VLAN-specific counters.
C. The interface-specific parameter is required to configure VLAN-based filters.
D. The interface-specific parameter is required to configure port-based firewall filters.
 

You want to configure your Junos device so that routing information from certain prefixes on a neighboring router are ignored.

What should you configure on your device?

A. It interface
B. firewall rule
C. martian address
D. vt interface
 

Which protocol prevents loops and calculates the best path through a switched network that contains redundant paths?

A. VRRP
B. STP
C. DHCP
D. IS-IS
 

Which two situations would cause dynamic ARP inspection to drop traffic? (Choose two.)

A. if no IP-to-MAC address entry exists in the DHCP snooping database
B. if the IP address in the ARP packet is deemed invalid
C. if the requested MAC address exceeds the configured limit on the port
D. if the ARP packet comes from a port that has been configured as trusted
 

Which statement is correct about IS-IS link state PDUs?

A. They are used to maintain link-state database synchronization.
B. They are used to establish adjacencies.
C. They are used to build the link-state database.
D. They are used to determine whether the neighbors are Level 1 or Level 2.
 

What are two reasons for configuring more than one VLAN on a switch? (Choose two.)

A. A group of clients requires that security be applied to traffic entering or exiting the group's devices.
B. A group of devices must forward traffic across a WAN.
C. A group of devices are connected to the same Layer 3 network.
D. A group of clients requires that the group's devices receive less broadcast traffic than they are currently receiving.
 

Click the Exhibit button.

 

Referring to the output shown in the exhibit, which statement is correct?

A. 11.0.0.108/32 is being per-flow load-balanced
B. 11.0.0.102/32 is being per-packet load-balanced
C. 11.0.0.102/32 is being per-flow load-balanced
D. 11.0.0.108/32 is being per-packet load-balanced
 

Which statement is correct about trunk ports?

A. Trunk ports must have an IRB assigned to accept VLAN tagged traffic.
B. By default, trunk ports accept only VLAN tagged traffic.
C. By default, a trunk port can have only a single VLAN assigned.
D. trunk ports must have an IRB assigned to accept untagged traffic.
 

Which statement is true about IP-IP tunnels?

A. The time-to-live value of the original packet is decremented.
B. IP-IP tunnels are protocol agnostic.
C. The packet is encapsulated unchanged before entering the tunnel.
D. The packet header is replaced before entering the tunnel.
 

Which two elements are used to create the STP bridge ID? (Choose two.)

A. the root port number
B. the bridge priority value
C. the system MAC address
D. the port cost
 

Click the Exhibit button.

 

You have configured OSPF routing as shown in the exhibit. You notice that all interfaces have formed full adjacencies, with the exception of the interfaces connecting R3 and R4 with a status of 2Way.

What is the reason for this status?

A. The two routers must both be configured as DR routers.
B. DROther routers will not form a full adjacency with each other.
C. The two routers must be configured in different areas.
D. The interface-type is not configured as p2p.
 

Click the Exhibit button.

 

Referring to the exhibit, which two statements about BGP prefixes advertised by R1 to AS 65501 are true? (Choose two.)

A. R1 will modify the originator ID attribute in prefixes advertised to AS 65501
B. R1 will modify the AS path attribute in prefixes advertised to AS 65501
C. R1 will modify the next-hop attribute in prefixes advertised to AS 65501
D. R1 will modify the cluster list attribute in prefixes advertised to AS 65501
 

Which two sequences correctly describe the processing order of firewall filters on an EX Series switch? (Choose two.)

A. router filter > VLAN filter > port filter > transmit packet
B. port filter > VLAN filter > router filter > transmit packet
C. receive packet > port filter > VLAN filter > router filter
D. receive packet > router filter > VLAN filter > port filter
 

An EBGP session sources its TCP connection from which IP address?

A. The IP address assigned as the router ID.
B. The IP address of the preferred address assigned to the loopback interface.
C. The IP address of the primary address assigned to the loopback interface.
D. The IP address of the interface that connects the two BGP speakers.