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100% Pass Juniper - Useful JN0-280 PDF Guide

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q54-Q59):

NEW QUESTION # 54
What is the definition of a trunk interface on a switch?

A. An interface that carries multiple VLANs.
B. An interface that connects directly to powerful servers.
C. An interface that carries excess traffic.
D. An interface that carries high bandwidth.

Answer: A

Explanation:
A trunk interface on a switch is used to carry traffic for multiple VLANs between switches or between a switch and another network device, like a router. Trunk interfaces use 802.1Q tagging to identify which VLAN the traffic belongs to.
Step-by-Step Breakdown:
Trunk Ports:
Trunk ports are typically used for inter-switch links or switch-to-router links where multiple VLANs need to be carried over the same physical connection.
VLAN traffic is tagged with a VLAN ID to ensure that it is properly identified as it crosses the trunk link.
802.1Q VLAN Tagging:
Trunk ports use 802.1Q to tag Ethernet frames with the VLAN ID. This ensures that frames are correctly forwarded to the appropriate VLANs on the other side of the trunk.
Juniper Reference:
Trunk Interface Configuration: In Juniper switches, trunk ports are configured to carry tagged traffic for multiple VLANs, which is essential for interconnecting multiple network segments.

NEW QUESTION # 55
What is Integrated Routing and Bridging (IRB) primarily used for in a Junos device?

A. To separate VLAN traffic.
B. To provide inter-VLAN routing.
C. For implementing security policies.
D. For aggregating multiple interfaces.

Answer: B

NEW QUESTION # 56
Which statement is correct about IBGP?

A. It requires a logical full mesh.
B. It ensures that the local and remote peers use different AS numbers.
C. It ensures that duplicate AS numbers are not present in the AS path.
D. It requires a physical full mesh.

Answer: A

Explanation:
InIBGP (Internal Border Gateway Protocol), all routers within the same AS (Autonomous System) must have a logical full-mesh topology. This means that every IBGP router must be able to communicate with every other IBGP router directly or indirectly to ensure proper route propagation.
Step-by-Step Breakdown:
* Logical Full Mesh:
* In an IBGP setup, routers do not re-advertise routes learned from one IBGP peer to another IBGP peer. This rule is in place to prevent routing loops within the AS.
* To ensure full route propagation, alogical full meshis required, meaning every IBGP router must peer with every other IBGP router in the AS. This can be done either directly or via route reflection or confederation.
* Physical Full Mesh Not Required:The physical topology does not need to be a full mesh, but the BGP peering relationships must form a logical full mesh. Techniques like route reflectors or BGP confederations can reduce the need for manual full-mesh peering.
Juniper Reference:
* IBGP Configuration: IBGP logical full mesh requirements can be simplified usingroute reflectorsto avoid the complexity of manually configuring many IBGP peers.

NEW QUESTION # 57
What statement is true about load-balancing?

A. Load balancing is only supported after applying an advanced license.
B. Load balancing on Juniper devices is processed per-flow.
C. Load balancing on Juniper devices is processed per-packet.
D. Load balancing is only supported by dynamic routing protocols.

Answer: B

NEW QUESTION # 58
Which statement is correct about the OSPF link-state database?

A. Each router within the OSPF domain must maintain an identical copy of the link-state database.
B. Each router within the same area must maintain a unique copy of the link-state database.
C. Each router within the same area must maintain an identical copy of the link-state database.
D. Each router within the OSPF domain must maintain a unique copy of the link-state database.

Answer: C

NEW QUESTION # 59
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