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Juniper JN0-280 Exam Sample 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.

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 # 2

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.

Answer

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.

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Question # 3

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

Answer

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.

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Question # 4

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 # 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.

Answer

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.

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