JN0-280 exam dumps, Juniper JN0-280 network simulator review

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The JN0-280 certification exam is a computer-based exam that consists of 65 multiple-choice questions. Candidates have 90 minutes to complete the exam. JN0-280 Exam is administered by Pearson VUE, a leading provider of computer-based testing services.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q119-Q124):

NEW QUESTION # 119
What information in the Ethernet header is used to populate the bridging table?

A. type
B. source address
C. destination address
D. protocol

Answer: B

Explanation:
Thesource MAC addressin the Ethernet header is used to populate thebridging table(also called the MAC address table) on a switch. When a frame arrives at a switch, the switch examines the source MAC address and records it along with the ingress port in its MAC address table.
Step-by-Step Breakdown:
* Learning Process:When an Ethernet frame arrives on a switch port, the switch looks at thesource MAC addressand adds this MAC address to the MAC table along with the port it was received on.
This process is calledMAC learning.
* Purpose:The switch uses this information to determine the correct port to send frames destined for that MAC address in future transmissions, thus ensuring efficient Layer 2 forwarding.
Juniper Reference:
* Ethernet Switching: Juniper switches use source MAC addresses to build and maintain the MAC address table, which is essential for Layer 2 switching.

NEW QUESTION # 120
Which Junos operational mode command is used to troubleshoot issues with VLANs?

A. monitor traffic
B. show ethernet-switching table
C. show vlans
D. show interfaces

Answer: B

NEW QUESTION # 121
A generated route is configured under which hierarchy?

A. [edit routing-instance]
B. [edit protocols]
C. [edit policy-options]
D. [edit routing-options]

Answer: D

Explanation:
Agenerated routein Junos OS is configured under the[edit routing-options]hierarchy.
Step-by-Step Breakdown:
* Generated Routes:A generated route is created based on the presence of more specific routes in the routing table. It acts as a summary route and is generated when any of its contributing routes are active.
This is commonly used to create aggregate routes in OSPF, BGP, or other protocols.
* Configuration Hierarchy:The configuration for generated routes is placed under[edit routing-options]
, where other static and routing policies are also defined.
* Command Example:
set routing-options generate route 10.10.0.0/16
Juniper Reference:
* Routing Options: Juniper routers use the routing-options hierarchy to configure generated routes and other static routing behaviors.

NEW QUESTION # 122
You want to minimize topology disruptions in your network when the rpd process restarts on a device. Which service would accomplish this task?

A. Bidirectional Forwarding Detection (BFD)
B. graceful restart (GR)
C. Virtual Chassis
D. link aggregation groups

Answer: B

Explanation:
Graceful Restart (GR)is a feature that allows a router to maintain forwarding even when the routing process (e.g., the rpd process in Junos) is restarting, minimizing disruption to the network.
Step-by-Step Breakdown:
* Graceful Restart Function:During aGR event, the forwarding plane continues to forward packets based on existing routes, while the control plane (rpd process) is restarting. This prevents traffic loss and maintains routing stability.
* Minimizing Disruptions:GR is particularly useful in ensuring continuous packet forwarding during software upgrades or routing protocol process restarts.
Juniper Reference:
* Graceful Restart in Junos: GR ensures high availability by maintaining forwarding continuity during control plane restarts, enhancing network reliability.

NEW QUESTION # 123
Which two statements about IBGP are correct? (Choose two.)

A. IBGP uses full mesh for loop prevention.
B. By default, IBGP has a TTL of 1.
C. IBGP uses AS path for loop prevention.
D. By default, IBGP has a TTL of 255.

Answer: A,D

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.

NEW QUESTION # 124
......

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