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Juniper JN0-280 Exam Sample Questions

Question # 1

Which two statements are correct about EVPN-VXLAN overlay networking? (Choose two.)

A. It is the only option to provide reachability between servers that reside in the same network segment in a data center.

B. BGP provides the control plane within the overlay network.

C. OSPF provides the control plane within the overlay network.

Answer

B. BGP provides the control plane within the overlay network.
C. OSPF provides the control plane within the overlay network.

Explanation:

EVPN-VXLANis an overlay technology used in data center networks to extend Layer 2 services over a Layer 3 network.

Step-by-Step Breakdown:

BGP Control Plane:BGP (Border Gateway Protocol)is used as the control plane for EVPN-VXLAN. BGP advertises MAC addresses and IP address reachability information across the VXLAN network, enabling efficient multi-tenant Layer 2 connectivity over a Layer 3 infrastructure.

Encapsulation:VXLAN (Virtual Extensible LAN)encapsulates Layer 2 frames into Layer 3 packets. This encapsulation allows Layer 2 traffic to be transported across a Layer 3 network, effectively creating a tunnel for Ethernet frames.

Juniper Reference:

EVPN-VXLAN Configuration: Juniper supports EVPN-VXLAN with BGP as the control plane, allowing scalable Layer 2 connectivity over a routed infrastructure in modern data centers.

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Question # 2

Which two statements are correct about rules for EBGP and IBGP? (Choose two.)

A. EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.

B. EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.

C. EBGP routes are more preferred than IBGP routes.

D. IBGP routes are more preferred than EBGP routes.

Answer

A. EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.
C. EBGP routes are more preferred than IBGP routes.

Explanation:

EBGP (External BGP)andIBGP (Internal BGP)operate with different rules due to the nature of their relationships.

Step-by-Step Breakdown:

TTL Differences:

EBGP: By default, EBGP peers have a TTL of 1, meaning they must be directly connected, or the TTL needs to be manually increased for multihop EBGP.

IBGP: IBGP peers within the same AS have a TTL of 255, as they are expected to communicate over multiple hops within the AS.

Preference for EBGP Routes:

Routes learned viaEBGPare typically preferred over IBGP routes. This is because EBGP routes are considered more reliable since they originate outside the AS, while IBGP routes are internal.

Juniper Reference:

BGP Configuration: The different handling of TTL and route preferences between EBGP and IBGP ensures proper route selection and security within Junos-based networks.

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Question # 3

Which signaling protocol is used for EVPN?

A. OSPF

B. PIM

C. IS-IS

D. BGP

Answer

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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Question # 4

What are two consequences of having all network devices in a single collision domain? (Choose two.)

A. The amount of network resource consumption does not change.

B. The chance of packet collision is decreased.

C. The chance of packet collision is increased.

D. The amount of network resource consumption is increased.

Answer

C. The chance of packet collision is increased.
D. The amount of network resource consumption is increased.

Explanation:

Acollision domainis a network segment where data packets can "collide" with one another when being sent on the same network medium.

Step-by-Step Breakdown:

Increased Collision Probability:If all devices are in asingle collision domain, the likelihood of packet collisions increases as more devices attempt to send packets simultaneously, leading to network inefficiencies.

Increased Resource Consumption:More collisions result inincreased network resource consumptionas devices need to retransmit packets, causing higher utilization of bandwidth and slowing down network performance.

Juniper Reference:

Collision Domains: Proper network segmentation using switches reduces collision domains, thereby improving network performance and reducing packet collisions.

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Question # 5

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.

Answer

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.

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