LATEST JN0-281 TEST QUESTION | NEW EXAM JN0-281 BRAINDUMPS

Latest JN0-281 Test Question | New Exam JN0-281 Braindumps

Latest JN0-281 Test Question | New Exam JN0-281 Braindumps

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q57-Q62):

NEW QUESTION # 57
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. No traffic is traversing the LAG interfaces.
  • B. The LAG interfaces are in aggressive mode.
  • C. The LAG interfaces are in a passive state.
  • 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 # 58
Exhibit:

Referring to the exhibit, which two statements are correct about default BGP advertisements? (Choose two.)

  • A. When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.
  • B. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.
  • C. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.
  • D. When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

Answer: C,D

Explanation:
The exhibit shows a BGP peering scenario between three routers: router1 and router2 are part of the same AS (AS65000), while the SP router is in a different AS (AS65101). This indicates an EBGP (External BGP) peering between the SP router and router1, and IBGP between router1 and router2.
Step-by-Step Breakdown:
Next-Hop Behavior in BGP:
IBGP: In IBGP, the next-hop address is not modified when advertising routes within the same AS. Thus, when router1 advertises routes learned from router2 to the SP router, it will keep the next-hop address of router1, not router2.
EBGP: In EBGP, the next-hop address is modified. When router1 receives routes from the SP router, it will advertise them to router2 with the next-hop address of router1.
Route Propagation:
Routes received by router1 from router2 will be advertised to the SP router with router1 as the next hop.
Similarly, routes advertised by the SP router will be passed on to router2, with router1 remaining as the next hop.
Juniper
Reference: BGP Next-Hop: Juniper's BGP implementations follow standard BGP next-hop behavior, where the next-hop is modified in EBGP but not in IBGP, ensuring proper route advertisement across autonomous systems.


NEW QUESTION # 59
What is the main purpose of Bidirectional Forwarding Detection (BFD)?

  • A. to determine packet round-trip latency
  • B. to determine if the forwarding routes are correct
  • C. to detect the forwarding protocol
  • D. to detect network path failures

Answer: D

Explanation:
Bidirectional Forwarding Detection (BFD) is a network protocol used to detect failures in the network path between two devices quickly.
Step-by-Step Breakdown:
Path Failure Detection:
BFD provides a low-overhead mechanism for detecting failures in forwarding paths across Layer 3 networks. It is much faster than traditional routing protocol timers and can detect failures within milliseconds.
BFD in Routing:
BFD can be integrated with routing protocols like OSPF, BGP, or IS-IS to trigger a faster convergence when a network path goes down.
Juniper Reference:
BFD Configuration: Juniper devices use BFD to monitor network paths and ensure fast failure detection, enhancing network resilience.


NEW QUESTION # 60
Exhibit:

Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?

  • A. 400 seconds
  • B. 2000 milliseconds
  • C. 2000 seconds
  • D. 400 milliseconds

Answer: B

Explanation:
The exhibit shows the configuration of Bidirectional Forwarding Detection (BFD) for OSPF on interface xe-0/0/4.0, with the following parameters:
minimum-interval: 400 milliseconds
multiplier: 5
Step-by-Step Breakdown:
BFD Liveness Detection:
BFD is used to detect link failures at sub-second intervals, providing faster convergence times for routing protocols like OSPF. The minimum-interval is the time between BFD control packets (in milliseconds), and the multiplier indicates how many missed BFD packets trigger a failure.
Calculating Failure Detection Time:
The failure detection interval is calculated as:
Failure Interval=minimum-interval×multipliertext{Failure Interval} = text{minimum-interval} times text{multiplier}Failure Interval=minimum-interval×multiplier In this case:
400milliseconds×5=2000milliseconds(2seconds)400 , text{milliseconds} times 5 = 2000 , text{milliseconds} (2 seconds)400milliseconds×5=2000milliseconds(2seconds) Conclusion:
If no BFD control packets are received within 2000 milliseconds (2 seconds), the interface will be considered down, triggering OSPF to recalculate routes.
Juniper Reference:
BFD Configuration: BFD parameters such as minimum-interval and multiplier are used to fine-tune the failure detection time for faster convergence.


NEW QUESTION # 61
What is the default route preference of a static route in the Junos OS?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: D

Explanation:
In Junos OS, the default route preference for a static route is 5. Route preference values are used to determine which route should be installed in the routing table when multiple routes to the same destination are available.
Step-by-Step Breakdown:
Static Route Preference:
A static route, by default, has a preference of 5, making it a highly preferred route. Lower preference values are more preferred in Junos, meaning static routes take precedence over most dynamic routing protocol routes, such as OSPF (preference 10) or BGP (preference 170).
Route Preference:
Route preference is a key factor in the Junos routing decision process. Routes with lower preference values are preferred and installed in the forwarding table.
Juniper
Reference: Static Routes: In Junos, the default preference for static routes is 5, making them more preferred than most dynamic routes.


NEW QUESTION # 62
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