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The JN0-280 Exam is part of the Juniper Networks Certification Program, which offers a range of certifications for networking professionals. The JNCIA-DC certification is the first step in the Data Center certification track and is a prerequisite for higher certifications in this track. Data Center, Associate (JNCIA-DC) certification provides a solid foundation for professionals who want to pursue a career in data center networking.

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The JN0-280 Certification Exam is a 90-minute exam that consists of 65 multiple-choice questions. JN0-280 exam is administered by Pearson VUE and can be taken at any of their testing centers worldwide. To pass the exam, candidates must obtain a minimum score of 65%. Upon successful completion of the exam, candidates will be awarded the Juniper Networks Certified Associate - Data Center (JNCIA-DC) certification. Data Center, Associate (JNCIA-DC) certification is valid for three years, after which candidates must recertify to maintain their certification status.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q147-Q152):

NEW QUESTION # 147
Which two statements are correct about aggregated Ethernet bundles? (Choose two.)

A. You must enable LACP when configuring aggregated Ethernet bundles.
B. You must enable the chassis to support aggregated Ethernet interfaces.
C. You must purchase a services license for the chassis to support aggregate Ethernet interfaces.
D. You must specify which interfaces are members of a specific aggregated Ethernet bundle.

Answer: B,D

NEW QUESTION # 148
Which BGP message type is used to establish peering sessions?

A. Keepalive
B. Open
C. Update
D. Notification

Answer: B

NEW QUESTION # 149
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 area ID mismatch.
B. There is an MTU mismatch.
C. The priority is set to 255.
D. There is an interval timing mismatch.

Answer: B

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 # 150
Which two statements are correct about rules for EBGP and IBGP? (Choose two.)

A. EBGP routes are more preferred than IBGP routes.
B. IBGP routes are more preferred than EBGP routes.
C. EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.
D. EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.

Answer: A,D

Explanation:
EBGP (External BGP)andIBGP (Internal BGP)operate with different rules due to the nature of their relationships.
Step-by-Step Breakdown:
* TTL Differences:
* EBGP: By default, EBGP peers have a TTL of 1, meaning they must be directly connected, or the TTL needs to be manually increased for multihop EBGP.
* IBGP: IBGP peers within the same AS have a TTL of 255, as they are expected to communicate over multiple hops within the AS.
* Preference for EBGP Routes:
* Routes learned viaEBGPare typically preferred over IBGP routes. This is because EBGP routes are considered more reliable since they originate outside the AS, while IBGP routes are internal.
Juniper Reference:
* BGP Configuration: The different handling of TTL and route preferences between EBGP and IBGP ensures proper route selection and security within Junos-based networks.

NEW QUESTION # 151
Referring to the exhibit, which protocol is associated with the route selected for traffic destinated to 10.255.14.177?

A. OSPF
B. BGP
C. Local
D. Direct

Answer: B

NEW QUESTION # 152
......

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