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JN0-280 Practice Questions

Question # 1
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.


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.


Question # 2
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.


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.


Question # 3
Which two statements about IBGP are correct? (Choose two.)
A. By default, IBGP has a TTL of 1.
B. IBGP uses AS path for loop prevention.
C. By default, IBGP has a TTL of 255.
D. IBGP uses full mesh for loop prevention.


C. By default, IBGP has a TTL of 255.
D. IBGP uses full mesh for loop prevention.

Explanation:

IBGP (Internal Border Gateway Protocol)is used to exchange routing information betweenrouters within the same AS (Autonomous System).

Step-by-Step Breakdown:

TTL of 255:

By default, IBGP sessions are established with aTTL (Time to Live)value of255. This allows IBGP neighbors to communicate over multiple hops within the AS without requiring any additional configuration.

Full Mesh Requirement:

IBGP requires alogical full meshbetween all IBGP routers to ensure that routing information is fully distributed within the AS. Since IBGP does not propagate routes learned from one IBGP peer to another by default, a full mesh topology is needed unlessroute reflectorsorBGP confederationsare used.

Juniper Reference:

IBGP Full Mesh: Juniper recommends using route reflectors in large networks to simplify IBGP full-mesh requirements.


Question # 4
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 # 5
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.


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.


Question # 6
What are two requirements for an IP fabric? (Choose two.)
A. a Layer 3 routing protocol
B. a single connection between each spine and leaf
C. a single connection between each leaf
D. a Layer 2 switching protocol


A. a Layer 3 routing protocol
B. a single connection between each spine and leaf

Explanation:

AnIP fabricis a network architecture commonly used in data centers to provide scalable, high-throughput connectivity using aspine-leaf topology.

Step-by-Step Breakdown:

Layer 3 Routing Protocol:An IP fabric relies on aLayer 3 routing protocol, typically BGP or OSPF, to provide routing between the leaf and spine switches. This ensures efficient traffic forwarding across the network.

Single Connection Between Spine and Leaf:In an IP fabric, each leaf switch connects toevery spine switchwith a single connection. This ensures that traffic between any two leaf switches can travel through the spine layer in just two hops.

Juniper Reference:

Spine-Leaf Design: Juniper’s IP fabric implementations are designed for scalability and low-latency routing, often using protocols like BGP for Layer 3 control.

Question # 7
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.


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.

Question # 8
Which statement is correct about per-flow load balancing?
A. Packets associated with the same flow are sent through different egress ports.
B. The packets are guaranteed to arrive at their destination in a different order in which they were sent.
C. Packets associated with the same flow are sent through the same egress port.
D. The packets are guaranteed to arrive at their destination in the same order in which they were sent.


C. Packets associated with the same flow are sent through the same egress port.

Explanation:

Per-flow load balancingensures that packets within the same flow are always forwarded over the same path, ensuring that packet order is preserved.

Step-by-Step Breakdown:

Flow Definition:A flow is typically defined by a combination of packet attributes like source/destination IP, source/destination port, and protocol type. Packets that belong to the same flow are routed over the same path to avoid reordering.

Per-Flow Behavior:Inper-flow load balancing, the hashing algorithm ensures that all packets in a particular flow use thesame egress port, maintaining order across the network.

Juniper Reference:

Load Balancing in Juniper: This method ensures that flows are balanced across multiple paths while preventing packet reordering within a single flow.


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Juniper JN0-280 Exam Dumps

Exam Name: Data Center, Associate (JNCIA-DC)
Certification Name: JNCIA-DC

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  • Total Questions: 65
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