PASS-SURE DUMPS JN0-281 PDF & LEADER IN CERTIFICATION EXAMS MATERIALS & TRUSTED JN0-281 VALID EXAM SAMPLE

Pass-Sure Dumps JN0-281 PDF & Leader in Certification Exams Materials & Trusted JN0-281 Valid Exam Sample

Pass-Sure Dumps JN0-281 PDF & Leader in Certification Exams Materials & Trusted JN0-281 Valid Exam Sample

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q63-Q68):

NEW QUESTION # 63
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. The priority is set to 255.
  • C. There is an MTU mismatch.
  • D. There is an area ID mismatch.

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 # 64
Under which Junos hierarchy is a static route configured?

  • A. routing-options
  • B. protocols
  • C. system
  • D. routing-instances

Answer: A


NEW QUESTION # 65
What does filter-based forwarding in networking typically allow?

  • A. Load balancing across multiple CPUs
  • B. Forwarding decisions based on MAC addresses
  • C. Aggregation of multiple routes into a single entry
  • D. Routing decisions based on extended criteria like packet headers

Answer: D


NEW QUESTION # 66
What does the "qualified-next-hop" feature do when configuring a static route?

  • A. It instructs the device to looks up a static route's next-hop that is not directly connected.
  • B. It allows you to specify an independent route preference value for an additional next hop.
  • C. It instructs the device to verify the next-hop is reachable before activating the route.
  • D. It specifies the IP address of the directly connected device.

Answer: B


NEW QUESTION # 67
Referring to the exhibit, why are the BGP routes hidden?

  • A. The BGP next hop is unreachable.
  • B. Other routes are selected because of better metrics.
  • C. There are too many hops to the destination.
  • D. Load balancing is not enabled.

Answer: A

Explanation:
In the exhibit, the BGP routes are marked as hidden. This typically happens when the routes are not considered valid for use, but they remain in the routing table for reference. One common reason for BGP routes being hidden is that the next hop for these routes is unreachable.
Step-by-Step Breakdown:
BGP Next Hop:
In BGP, when a route is received from a neighbor, the next hop is the IP address that must be reachable for the route to be used. If the next hop is unreachable (i.e., the router cannot find a path to the next-hop IP), the route is marked as hidden. Analyzing the Exhibit:
The exhibit shows that the BGP next hop for all hidden routes is 10.4.4.4. If this IP is unreachable, the BGP routes from that neighbor will not be considered valid, even though they appear in the routing table.
Verification:
Use the command show route 10.4.4.4 to check if the next-hop IP is reachable.
If the next-hop is not reachable, the BGP routes will be hidden. Resolving the next-hop reachability issue (e.g., fixing an IGP route or an interface) will allow the BGP routes to become active. Juniper Reference: Junos Command: show route hidden displays routes that are not considered for forwarding. Troubleshooting: Check the next hop reachability for hidden BGP routes using show route <next-hop>.


NEW QUESTION # 68
......

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