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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 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 # 3
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.


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
By default, which two statements are correct about BGP advertisements? (Choose two.)
A. BGP peers advertise routes received from EBGP peers to other IBGP peers.
B. BGP peers advertise routes received from IBGP peers to other IBGP peers.
C. BGP peers advertise routes from EBGP peers to other IBGP peers using its own address as thenext hop.
D. BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.


A. BGP peers advertise routes received from EBGP peers to other IBGP peers.
D. BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.

Explanation:

BGP (Border Gateway Protocol)has specific rules for route advertisement between peers.

Step-by-Step Breakdown:

EBGP to IBGP Route Propagation:

BGP peers advertise routes learned fromEBGP peerstoIBGP peerswithin the same AS. This ensures that routes learned from external networks are propagated internally within the AS.

IBGP to EBGP Route Propagation:

Routes learned fromIBGP peerscan be advertised toEBGP peers, but when advertising these routes, the router uses its own IP address as thenext hop.

IBGP Split Horizon:

By default, IBGP peers do not advertise routes learned from one IBGP peer to another IBGP peer. This rule (IBGP split horizon) prevents routing loops within an AS.

Juniper Reference:

BGP Advertisement Rules: Junos adheres to BGP standards, where IBGP peers do not propagate routes to other IBGP peers, but EBGP peers receive IBGP routes with the advertising router as the next hop.


Question # 6
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 # 7
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 # 8
Which state in the adjacency process do OSPF routers check the MTU size?
A. Init
B. Exchange
C. Done
D. ExStart


B. Exchange

Explanation:

In OSPF, routers exchange link-state information in different stages to establish full adjacency. TheMTU sizeis checked during theExchangestate.

Step-by-Step Breakdown:

OSPF Adjacency Process:

OSPF routers go through multiple stages when forming an adjacency:Down,Init,2-Way,ExStart,Exchange,Loading, andFull.

Exchange State:

During theExchangestate, OSPF routers exchangeDatabase Description (DBD)packets to describe their link-state databases. TheMTU sizeis checked at this stage to ensure both routers can successfully exchange these packets without fragmentation.

If there is anMTU mismatch, the routers may fail to proceed past the Exchange state.

Juniper Reference:

MTU Checking in OSPF: Junos uses the Exchange state to check for MTU mismatches, ensuring that routers can properly exchange database information without packet fragmentation issues.


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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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