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JN0-281 Prüfungsübungen, JN0-281 Zertifikatsfragen

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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 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 3

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.

Thema 4

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 5

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.

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Neueste Data Center, Associate (JNCIA-DC) Prüfung pdf & JN0-281 Prüfung Torrent

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Juniper Data Center, Associate (JNCIA-DC) JN0-281 Prüfungsfragen mit Lösungen (Q75-Q80):

75. Frage
Referring to the exhibit, why are the BGP routes hidden?

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

Antwort: A

Begründung:
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>.

76. Frage
Load balancing in routing is used to:

A. Compress data to improve transmission speed.
B. Distribute traffic evenly across multiple paths.
C. Encrypt data packets.
D. Automatically update routing tables.

Antwort: B

77. Frage
What are two reasons why you would deploy an IP fabric instead of a traditional Layer 2 network in a data center? (Choose two.)

A. Layer 3 networks support load balancing.
B. Layer 2 networks are susceptible to loops.
C. Layer 2 networks only support a single broadcast domain.
D. IP fabrics are better suited to smaller networks where scale is less important.

Antwort: A,B

Begründung:
IP fabrics are Layer 3-centric network designs often used in data centers due to their scalability, efficient routing, and loop-free architecture.
Step-by-Step Breakdown:
Layer 3 Load Balancing:
IP fabrics use Equal-Cost Multipath (ECMP) to distribute traffic across multiple paths, providing effective load balancing and improving bandwidth utilization. This capability is absent in traditional Layer 2 networks, which do not support ECMP for routing decisions.
Layer 2 Loops:
Layer 2 networks are prone to loops because of the lack of TTL (Time-to-Live) mechanisms. Spanning Tree Protocol (STP) is required to prevent loops, but it can introduce inefficiencies by blocking links. In contrast, IP fabrics based on Layer 3 protocols are loop-free and do not need STP. Juniper Reference: IP Fabric: Juniper's IP fabric solutions offer efficient Layer 3 routing with built-in load balancing and loop prevention, making them ideal for modern data center architectures.

78. Frage
What is a VLAN?

A. A broadcast domain, using only virtual machines
B. A broadcast domain, identified by a VLAN ID
C. A multicast domain, identified by a VLAN ID
D. A local network using only virtual machines

Antwort: B

79. Frage
Which of the following is an important consideration when configuring BFD?

A. Setting a very high multiplier to avoid false positives
B. Using the same BFD interval on all devices in the network
C. Adjusting the BFD interval and multiplier according to network needs
D. Disabling all other failure detection mechanisms

Antwort: C

80. Frage
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