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JN0-281 Data Center, Associate (JNCIA-DC) Pass4sure Zertifizierung & Data Center, Associate (JNCIA-DC) zuverlässige Prüfung Übung

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Juniper JN0-281 Prüfungsplan:

Thema
Einzelheiten

Thema 1

• High Availability: This section of the exam measures the skills of a Data Center Reliability Engineer and covers strategies to ensure continuous network availability. It includes features like Link Aggregation Groups (LAG), Graceful Restart (GR), Bidirectional Forwarding Detection (BFD), and Virtual Chassis. It also provides a basic understanding of how to configure, monitor, and troubleshoot each of these high-availability components to maintain resilient network performance.

Thema 2

• Data Center Architectures: This section of the exam measures the skills of a Data Center Architect and covers foundational knowledge about various data center designs. It includes traditional multitier architectures as well as more modern IP fabric architectures using spine-leaf topologies. The section also touches on Layer 2 and Layer 3 strategies for forwarding traffic, the differences between overlay and underlay networks, and introduces Ethernet VPN–Virtual Extensible LAN (EVPN-VXLAN), explaining its basic purpose and role in data center environments.

Thema 3

• Data Center Routing Protocols BGP
• OSPF: This section of the exam measures skills of a Network Operations Specialist and covers the operation and key concepts of the OSPF protocol. It explains elements such as the link-state database, OSPF packet types, and router IDs, including how adjacencies and designated routers work within areas. The section then transitions to BGP, outlining its basic operations, message types, attributes, and the path selection process. It also discusses both IBGP and EBGP roles. Lastly, the section reviews how to configure, monitor, and troubleshoot OSPF and BGP using routing policies and various tools.

Thema 4

• Protocol-Independent Routing: This section of the exam measures the skills of a Routing Engineer and covers routing features that function independently of any specific protocol. It includes static, aggregate, and generated routes, along with the concept of martian addresses. Routing instances and Routing Information Base (RIB) groups are introduced, as well as techniques like load balancing and filter-based forwarding. Configuration, monitoring, and troubleshooting aspects of these routing components are also covered in this section.

Thema 5

• Layer 2 Switching and VLANs: This section of the exam measuresthe skills of a Network Support Engineer and covers the essential concepts of Layer 2 switching operations within Junos OS. It includes an overview of Ethernet switching and bridging, providing an understanding of how Layer 2 networks function. The section also introduces VLAN concepts, focusing on port modes, VLAN tagging methods, and the purpose of Integrated Routing and Bridging (IRB). It further explores the practical side by addressing how to configure, monitor, and troubleshoot both Layer 2 switching and VLANs.

>> JN0-281 Fragen Antworten <<

Juniper JN0-281 Deutsche, JN0-281 Zertifizierung

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Juniper Data Center, Associate (JNCIA-DC) JN0-281 Prüfungsfragen mit Lösungen (Q10-Q15):

10. Frage
What happens if a frame with a known destination MAC address enters a switch?

• A. The ingress PFE performs a MAC address lookup and determines the egress PFE and port.
• B. The ingress PFE sends the header information to the RE.
• C. The egress PFE performs a MAC address lookup and determines the ingress PFE and port.
• D. The MAC address is added to the bridge table.

Antwort: A

11. Frage
How does VLAN tagging benefit network segmentation?

• A. By providing a backup path for data in case of link failure.
• B. By enabling the identification and separation of traffic belonging to different VLANs.
• C. By encrypting data traffic between VLANs.
• D. By ensuring the same IP address range can be used in different VLANs.

Antwort: B

12. Frage
Which statement about switches is correct?

• A. Every port is in a unique collision domain.
• B. All ports reside in the same collision domain.
• C. Each port is in a unique broadcast domain by default.
• D. Each port is a member of VLAN 2 by default.

Antwort: A

Begründung:
Each port on a modern switch creates a separate collision domain. This allows multiple devices to communicate simultaneously without collisions on different ports.
Step-by-Step Breakdown:
Collision Domain:
A collision domain is a network segment where data packets can collide if two devices send packets simultaneously.
On a switch, each port creates a separate collision domain, so collisions only occur if two devices connected to the same port (through a hub, for instance) try to send data at the same time. Switches vs Hubs:
Unlike hubs, which have one large collision domain, switches isolate collisions to individual ports, improving performance.
Juniper
Reference: Switch Port Behavior: In Juniper switches, each port operates in its own collision domain, enhancing network efficiency by reducing the chances of packet collisions.

13. Frage
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 shortest autonomous system path.
• D. It finds the path with the numerically lowest route preference.

Antwort: A

Begründung:
OSPF (Open Shortest Path First) calculates the best path based on the cost of 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 the numerically lowest total cost is 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.

14. Frage
Exhibit:

Referring to the exhibit, which behavior does this configuration enable on the ge-0/0/1.0 interface?

• A. This configuration enables the device to shut down the interface when a particular MAC address persistently sends broadcast traffic.
• B. This configuration enables the device to place a MAC address that persistently causes network errors into a special protected VLAN.
• C. This configuration enables the interface to learn and remember MAC addresses, until the device is rebooted.
• D. This configuration enables a MAC address learned on the interface to be persistently retained in the Ethernet-switching table, even after a reboot.

Antwort: D

Begründung:
The configuration in the exhibit shows the persistent-learning feature enabled on interface ge-0/0/1.0.
Step-by-Step Breakdown:
Persistent Learning:
Persistent-learning ensures that the MAC addresses learned on the interface are retained in the Ethernet-switching table, even after a device reboot. This prevents the need to re-learn MAC addresses after the device restarts, improving stability and reducing downtime.
Use Case:
This feature is particularly useful in environments where the re-learning of MAC addresses could cause temporary disruptions or delays in communication, such as in critical Layer 2 network segments.
Command Example:
set switch-options interface ge-0/0/1.0 persistent-learning
Juniper Reference:
Persistent MAC Learning: In Junos, enabling persistent-learning ensures that learned MAC addresses are not lost during reboots, contributing to smoother network operations in environments where stability is crucial.

15. Frage
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