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Latest JN0-280 Test Dumps, Practice JN0-280 Exam Pdf

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q78-Q83):

NEW QUESTION # 78
Which of the following statements are correct about the Spine/Leaf architecture? (Choose two)

A. Spine switches can connect directly to the data center's external network.
B. The Spine layer switches interconnect various Leaf switches.
C. The architecture reduces the need for inter-switch link (ISL) redundancy.
D. Each Leaf switch is directly connected to every server in the data center.

Answer: A,B

NEW QUESTION # 79
Layer 2 interfaces operate in which two modes? (Choose two.)

A. Access
B. Modular
C. Tagged
D. Trunk

Answer: A,D

Explanation:
Comprehensive Detailed Step by Step Explanation with all Juniper Data Center References Layer 2 interfaces on a switch operate in two key modes:AccessandTrunk.
Step-by-Step Breakdown:
* Access Mode:
* Access portsare used to connect end devices, like PCs or servers, and they are assigned to a single VLAN. These interfaces handle untagged traffic and do not pass VLAN tags.
* Example: A port assigned to VLAN 10 will only handle traffic for that VLAN.
* Trunk Mode:
* Trunk portsare used to connect switches or other networking devices that need to handle traffic from multiple VLANs. Trunk interfaces carry tagged traffic, allowing multiple VLANs to traverse the same physical link.
* Trunk ports typically use802.1QVLAN tagging to differentiate between VLANs.
Juniper Reference:
* Access and Trunk Ports: Juniper switches use these modes to manage VLAN traffic at Layer 2, with access ports handling untagged traffic and trunk ports handling tagged traffic from multiple VLANs.

NEW QUESTION # 80
How does OSPF calculate the best path to a particular prefix?

A. It finds the path with the numerically lowest cost.
B. It finds the path with the least number of hops.
C. It finds the path with the numerically lowest route preference.
D. It finds the path with the shortest autonomous system path.

Answer: A

Explanation:
OSPF (Open Shortest Path First)calculates the best path based on thecostof the route, which is derived from the bandwidth of the interfaces along the path.
Step-by-Step Breakdown:
* OSPF Path Selection:
* OSPF assigns a cost to each link, typically based on the link's bandwidth (higher bandwidth equals lower cost).
* The OSPF algorithm computes the shortest path to a destination by adding the costs of all links in the path. The path with thenumerically lowest total costis chosen as the best path.
* Cost Calculation:The OSPF cost can be manually adjusted or automatically calculated using the default formula:
Cost=Reference BandwidthLink Bandwidth ext{Cost} = rac{ ext{Reference Bandwidth}}{ ext{Link Bandwidth}}Cost=Link BandwidthReference Bandwidth Juniper Reference:
* OSPF Best Path Selection: OSPF selects the path with the lowest cumulative cost, ensuring efficient use of higher-bandwidth links in Junos networks.

NEW QUESTION # 81
Which VLAN tagging method inserts a 4-byte tag into the Ethernet frame?

A. ISL
B. Q-in-Q
C. MPLS
D. Dot1Q

Answer: D

NEW QUESTION # 82
What is the primary purpose of OSPF in network routing?

A. To redistribute routes between autonomous systems.
B. To encrypt data traffic between different networks.
C. To provide path vector routing within an autonomous system.
D. To offer dynamic routing within an autonomous system using link-state information.

Answer: D

NEW QUESTION # 83
......

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