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Juniper JN0-280 Exam Sample Questions


Question # 1

What is the behavior of the default export policy for OSPF?
A. Accept all routes.
B. Reject all routes.
C. Redistribute all routes.
D. Forward all routes.


B. Reject all routes.
Explanation:

In Junos, thedefault export policyforOSPFis toreject all routesfrom being exported.

Step-by-Step Breakdown:

Default Export Policy:By default,OSPFin Junos does not export any routes to other routing protocols or neighbors. This is a safety mechanism to prevent unintended route advertisements.

Custom Export Policies:

If you need to export routes, you must create a customexport policythat explicitly defines which routes to advertise.

Example: You can create an export policy to redistribute static or connected routes into OSPF.

Juniper Reference:

OSPF Export Behavior: In Juniper devices, the default policy for OSPF is to reject route advertisements unless explicitly configured otherwise through custom policies.





Question # 2

You want to enable a Junos device to support aggregated Ethernet interfaces. In this scenario, which configuration hierarchy would you use?
A. [edit switch-options]
B. [edit system]
C. [edit interfaces]
D. [edit chassis]


D. [edit chassis]
Explanation:

To configureaggregated Ethernet (AE) interfaceson a Junos device, the configuration is done under the[edit chassis]hierarchy.

Step-by-Step Breakdown:

Chassis Configuration:Thechassisconfiguration is responsible for enabling the hardware to supportLink Aggregation Groups (LAGs), allowing multiple physical interfaces to be bundled into a single logical interface for load balancing and redundancy.

Command Example:

set chassis aggregated-devices ethernet device-count

This command enables a specific number of aggregated Ethernet interfaces on the device.

Juniper Reference:

LAG Configuration in Junos: Thechassishierarchy is used to allocate and manage hardware resources for aggregated Ethernet interfaces in Juniper devices.





Question # 3

Which statement is correct about an IRB interface?
A. An IRB interface switches traffic within the same VLAN.
B. An IRB interface trunks together VLANs on different switches.
C. An IRB interface is a physical Layer 3 interface that connects VLANs together.
D. An IRB interface is a Layer 3 interface that can be used to route between VLANs.


D. An IRB interface is a Layer 3 interface that can be used to route between VLANs.
Explanation:

AnIRB (Integrated Routing and Bridging)interface provides routing functionality between VLANs at Layer 3, allowing devices in different VLANs to communicate with each other.

Step-by-Step Breakdown:

IRB Functionality:

The IRB interface enables routing between different VLANs by acting as a Layer 3 gateway. Traffic within the same VLAN is handled by Layer 2 switching, while traffic between VLANs is routed through the IRB interface.

Layer 3 Routing Between VLANs:

Each VLAN can be assigned an IP address on the IRB interface, which allows traffic to flow between VLANs based on Layer 3 IP routing.

Juniper Reference:

IRB Interface Configuration: Juniper supports IRB for inter-VLAN routing on devices like the EX and QFX series switches, facilitating Layer 3 communication in data centers.





Question # 4

When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)
A. The BFD default minimum interval is 3.
B. You can configure BFD per interface within the protocol stanza.
C. The BFD operation always consists of minimum intervals and multipliers.
D. The BFD default multiplier is 5.


B. You can configure BFD per interface within the protocol stanza.
C. The BFD operation always consists of minimum intervals and multipliers.
Explanation:

Bidirectional Forwarding Detection (BFD)is a protocol used to detect faults in the forwarding path between two routers. It provides rapid failure detection, enhancing the performance of routing protocols like OSPF, BGP, and IS-IS.

Step-by-Step Breakdown:

Per Interface Configuration:BFD can be configured on aper-interfacebasis within the protocol stanza (e.g., OSPF, BGP). This allows granular control over where BFD is enabled and the failure detection intervals for specific interfaces.

Minimum Interval and Multiplier:BFD uses aminimum interval(the time between BFD control packets) and amultiplier(the number of missed packets before the path is declared down). The combination of these two defines the detection time for failures.

Juniper Reference:

BFD Configuration: In Juniper, BFD is configurable within routing protocol stanzas, with the failure detection mechanism always based on minimum intervals and multipliers.





Question # 5

Which signaling protocol is used for EVPN?
A. OSPF
B. PIM
C. IS-IS
D. BGP


D. BGP
Explanation:

EVPN (Ethernet Virtual Private Network)is a standard protocol used for building Layer 2 and Layer 3 VPNs over an IP or MPLS network. Thesignaling protocolused for EVPN isBGP(Border Gateway Protocol).

Step-by-Step Breakdown:

BGP as the EVPN Signaling Protocol:EVPN uses BGP to exchange MAC address reachability information between routers (PE devices). This enables devices to learn which MAC addresses are reachable through which PE devices, facilitating Layer 2 forwarding across an IP or MPLS core.

BGP Extensions for EVPN:BGP is extended with new address families (e.g., EVPN NLRI) to carry both MAC and IP address information, allowing for scalable and efficient multi-tenant network solutions.

Juniper Reference:

Junos EVPN Configuration: Juniper uses BGP as the control plane for EVPN to exchange MAC and IP route information between different data center devices.




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