JN0-281 RELIABLE TEST PREPARATION | JN0-281 CERT EXAM

JN0-281 Reliable Test Preparation | JN0-281 Cert Exam

JN0-281 Reliable Test Preparation | JN0-281 Cert Exam

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q81-Q86):

NEW QUESTION # 81
A routing policy has been created to advertise OSPF routes in BGP. Which statement is correct in this scenario?

  • A. Apply the policy as an export policy within BGP.
  • B. Apply the policy as an import policy within BGP.
  • C. Apply the policy as an import policy within OSPF.
  • D. Apply the policy as an export policy within OSPF.

Answer: A

Explanation:
When advertising OSPF routes into BGP, the appropriate routing policy should be applied as an export policy in BGP.
Step-by-Step Breakdown:
OSPF to BGP Route Advertisement:
Routes learned via OSPF (a dynamic IGP) need to be exported into BGP to be advertised to external BGP peers. In Junos OS, this is done using export policies.
Export Policies in BGP:
An export policy controls which routes are advertised out of a BGP session. In this scenario, the routing policy must be applied to BGP as an export policy to export the OSPF-learned routes to external BGP peers.
Policy Configuration:
Example configuration:
set policy-options policy-statement EXPORT_OSPF term 1 from protocol ospf set policy-options policy-statement EXPORT_OSPF term 1 then accept set protocols bgp group <group-name> export EXPORT_OSPF This policy ensures that only OSPF routes are exported into BGP.
Juniper Reference:
Routing Policy: Export policies are used in BGP to control route advertisements to peers, including those learned via OSPF.


NEW QUESTION # 82
Filter-based forwarding is typically used to:

  • A. Implement policy-based routing decisions.
  • B. Automatically generate routing entries.
  • C. Optimize the routing table size.
  • D. Increase the security of the routing process.

Answer: A


NEW QUESTION # 83
Which statement is correct about aggregate routes?

  • A. The default next hop is reject.
  • B. The default next hop is readvertise.
  • C. The default next hop is resolve.
  • D. The default next hop is discard.

Answer: A

Explanation:
An aggregate route is a summarized route that is created by combining multiple specific routes into a single, broader route. In Junos OS, when an aggregate route is configured, its default next hop is set to reject.
Step-by-Step Explanation:
Aggregate Route:
Aggregate routes are used to reduce the size of routing tables by representing a collection of more specific routes with a single summary route. They help improve routing efficiency and scalability, especially in large networks.
Default Next Hop Behavior:
When you configure an aggregate route in Junos OS, it has a reject next hop by default.
The reject next hop means that if a packet matches the aggregate route but there is no more specific route in the routing table for that destination, the packet will be discarded, and an ICMP "destination unreachable" message is sent to the source.
This behavior helps to prevent routing loops and ensures that traffic isn't forwarded to destinations for which there is no valid route.
Modifying Next Hop:
If needed, the next hop behavior of an aggregate route can be changed to discard (which silently drops the packet) or to another specific next hop. However, by default, the next hop is set to reject.
Juniper Reference:
Junos Command: set routing-options aggregate route <route> reject to configure an aggregate route with a reject next hop.
Verification: Use show route to verify the presence and behavior of aggregate routes.


NEW QUESTION # 84
Referring to the exhibit, you notice that after committing the configuration, the ae0 and ae1 interfaces appear in a link down state.

Which statement is correct in this scenario?

  • A. The LAG interfaces are in a passive state.
  • B. No traffic is traversing the LAG interfaces.
  • C. The LAG interfaces are in aggressive mode.
  • D. No operational interfaces have been added to the LAG interfaces.

Answer: D

Explanation:
In the exhibit, the ae0 and ae1 interfaces are in a link down state. This occurs when no physical interfaces (member interfaces) have been added to the LAG (Link Aggregation Group) interfaces, or the member interfaces are not operational.
Step-by-Step Breakdown:
LAG Configuration:
A LAG interface (aggregated Ethernet interface) is a logical interface that combines multiple physical interfaces for redundancy and increased bandwidth. The LAG will only be operational if at least one member interface is active and configured correctly.
No Operational Member Interfaces:
If no member interfaces are added or if the member interfaces are down, the LAG will remain in a down state, as shown in the exhibit for ae0 and ae1.
Resolution:
Verify that physical interfaces have been added to the LAG using commands like:
LAG Interface Status: In Juniper, the link status of the LAG depends on its member interfaces, which must be operational for the LAG to function.


NEW QUESTION # 85
Which statement is correct about a five-stage IP fabric topology?

  • A. They are commonly referred to as interconnected data centers
  • B. There is a maximum of three hops between any end-devices
  • C. They are typically deployed in small to medium data centers
  • D. There is a maximum of five hops between any end-devices

Answer: D


NEW QUESTION # 86
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