JN0-281 WELL PREP & JN0-281 TEST PASSING SCORE

JN0-281 Well Prep & JN0-281 Test Passing Score

JN0-281 Well Prep & JN0-281 Test Passing Score

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Tags: JN0-281 Well Prep, JN0-281 Test Passing Score, JN0-281 Study Guide, Latest JN0-281 Exam Bootcamp, JN0-281 Latest Training

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JN0-281 Quiz Braindumps: Data Center, Associate (JNCIA-DC) - JN0-281 Quiz Torrent & JN0-281 Exam Review

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q122-Q127):

NEW QUESTION # 122
When troubleshooting an OSPF neighborship, you notice that the router stopped at the ExStart state.
What is the cause of this result?

  • A. There is an interval timing mismatch.
  • B. There is an area ID mismatch.
  • C. There is an MTU mismatch.
  • D. The priority is set to 255.

Answer: C

Explanation:
When an OSPF (Open Shortest Path First) neighborship is stuck in the ExStart state, it usually points to a mismatch in Maximum Transmission Unit (MTU) settings between two routers trying to establish the adjacency. The ExStart state is where OSPF routers negotiate the master-slave relationship and exchange DBD (Database Description) packets.
Step-by-Step Breakdown:
OSPF Neighbor States: OSPF goes through several states to establish an adjacency with a neighbor:
Down: No hello packets have been received.
Init: Hello packets are received, but bidirectional communication isn't confirmed.
2-Way: Bidirectional communication is established.
ExStart: The routers are negotiating who will be the master and who will be the slave, and begin to exchange DBD packets.
Exchange: The routers start exchanging the database information.
Loading: The routers process the Link-State Advertisements (LSAs).
Full: The adjacency is fully established.
MTU Mismatch Issue:
During the ExStart state, both OSPF routers must agree on their MTU values. If there is an MTU mismatch between the two routers, OSPF neighbors will fail to move from the ExStart to the Exchange state. The router with the larger MTU setting will not accept DBD packets from the router with a smaller MTU because the packets may exceed the smaller MTU size.
In Juniper devices, this behavior can be identified by examining the MTU settings using the show interfaces command and ensuring both routers have matching MTU configurations. To resolve this issue, either match the MTU settings on both routers or configure OSPF to ignore MTU mismatches using the command set protocols ospf ignore-mtu.
Juniper
Reference: Junos Command: show ospf neighbor helps diagnose neighbor states.
MTU Adjustment: set interfaces <interface-name> mtu <size> can be used to set the MTU values correctly.


NEW QUESTION # 123
How can OSPF be configured to prefer one route over another?

  • A. By setting a lower cost on the preferred route.
  • B. By configuring route redistribution.
  • C. By adjusting interface bandwidth.
  • D. By setting a higher cost on the preferred route.

Answer: A


NEW QUESTION # 124
Which statement is correct about member interfaces when creating a LAG?

  • A. Member interfaces must all be allocated on the same chassis when using a Virtual Chassis.
  • B. The interface's duplex settings and link speed must be the same on all member interfaces.
  • C. Member interfaces must all be allocated on the same PFE.
  • D. The interface's MTU settings must match on all member interfaces.

Answer: B

Explanation:
When creating a LAG (Link Aggregation Group) in Junos, the duplex settings and link speed must be the same across all member interfaces.
Step-by-Step Breakdown:
LAG Overview:
A LAG combines multiple physical interfaces into a single logical interface to increase bandwidth and provide redundancy. All member links must act as a single cohesive unit.
Interface Requirements:
Duplex: All member interfaces must operate in the same duplex mode (either full-duplex or half-duplex). Mismatched duplex settings can cause performance issues, packet drops, or interface errors.
Link Speed: All interfaces in the LAG must have the same link speed (e.g., all interfaces must be 1 Gbps or 10 Gbps). Mismatched speeds would prevent the interfaces from functioning correctly within the LAG.
Configuration and Validation: Ensure that all member interfaces have identical settings before adding them to the LAG. These settings can be checked using the show interfaces command, and the LAG can be configured using:
set interfaces ae0 aggregated-ether-options link-speed 10g
set interfaces ge-0/0/1 ether-options 802.3ad ae0
Juniper Reference:
LAG Configuration: Duplex and link speed must be consistent across member interfaces to ensure proper LAG operation in Juniper devices.


NEW QUESTION # 125
What is the main advantage of using MACsec?

  • A. It allows for the use of longer cable runs.
  • B. It provides Layer 2 encryption for data confidentiality and integrity.
  • C. It creates multiple virtual networks over a single physical infrastructure.
  • D. It increases the speed of the network.

Answer: B


NEW QUESTION # 126
Which EBGP feature must be used when peering to a non-directly connected peer address?

  • A. local preference
  • B. multihop
  • C. multipath
  • D. AS path

Answer: B


NEW QUESTION # 127
......

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