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最新的 JNCIA-DC JN0-281 免費考試真題 (Q79-Q84):

問題 #79
What is the primary use of a virtual link in OSPF?

A. To encrypt OSPF traffic.
B. To connect OSPF areas to external networks.
C. To balance load across multiple links.
D. To connect an OSPF area to the backbone area through a non-backbone area.

答案：D

問題 #80
What are two consequences of having all network devices in a single collision domain? (Choose two.)

A. The amount of network resource consumption does not change.
B. The chance of packet collision is decreased.
C. The chance of packet collision is increased.
D. The amount of network resource consumption is increased.

答案：C,D

解題說明：
A collision domain is a network segment where data packets can "collide" with one another when being sent on the same network medium.
Step-by-Step Breakdown:
Increased Collision Probability:
If all devices are in a single collision domain, the likelihood of packet collisions increases as more devices attempt to send packets simultaneously, leading to network inefficiencies. Increased Resource Consumption:
More collisions result in increased network resource consumption as devices need to retransmit packets, causing higher utilization of bandwidth and slowing down network performance. Juniper Reference: Collision Domains: Proper network segmentation using switches reduces collision domains, thereby improving network performance and reducing packet collisions.

問題 #81
When using spine and leaf fabric architectures, what is the role of each device? (Choose two.)

A. Spine nodes are used for transit to other leaf nodes.
B. Leaf nodes are used for traffic to other leafs.
C. Spine nodes are used for host connectivity.
D. Leaf nodes are used for host connectivity.

答案：A,D

解題說明：
In a spine-leaf fabric architecture, which is commonly used in data center designs, each device has a distinct role to ensure efficient and scalable network traffic flow. Step-by-Step Breakdown:
Spine Nodes:
The spine nodes form the backbone of the fabric and are responsible for transit traffic between leaf nodes. They connect to every leaf switch and provide multiple paths for traffic between leaf nodes, ensuring redundancy and load balancing.
Leaf Nodes:
The leaf nodes are used for host connectivity. These switches connect to servers, storage, or edge routers. They also connect to the spine switches to reach other leaf switches. Juniper Reference: Spine-Leaf Architecture: In Juniper's IP fabric designs, spine switches handle inter-leaf communication, while leaf switches manage host and endpoint connectivity.

問題 #82
In a traditional multi-tier architecture, which layer is responsible for aggregating access layers and providing connectivity to the core layer?

A. Distribution Layer
B. Core Layer
C. Edge Layer
D. Access Layer

答案：A

問題 #83
By default, which two statements are correct about BGP advertisements? (Choose two.)

A. BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.
B. BGP peers advertise routes received from IBGP peers to other IBGP peers.
C. BGP peers advertise routes from EBGP peers to other IBGP peers using its own address as the next hop.
D. BGP peers advertise routes received from EBGP peers to other IBGP peers.

答案：A,D

解題說明：
BGP (Border Gateway Protocol) has specific rules for route advertisement between peers.
Step-by-Step Breakdown:
EBGP to IBGP Route Propagation:
BGP peers advertise routes learned from EBGP peers to IBGP peers within the same AS. This ensures that routes learned from external networks are propagated internally within the AS. IBGP to EBGP Route Propagation:
Routes learned from IBGP peers can be advertised to EBGP peers, but when advertising these routes, the router uses its own IP address as the next hop.
IBGP Split Horizon:
By default, IBGP peers do not advertise routes learned from one IBGP peer to another IBGP peer.
This rule (IBGP split horizon) prevents routing loops within an AS.
Juniper
Reference: BGP Advertisement Rules: Junos adheres to BGP standards, where IBGP peers do not propagate routes to other IBGP peers, but EBGP peers receive IBGP routes with the advertising router as the next hop.

問題 #84
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最實用的JN0-281認證考試的學習資料

有效的Juniper JN0-281软件版是行業領先材料＆免費下載的JN0-281考試內容

最新的 JNCIA-DC JN0-281 免費考試真題 (Q79-Q84):

可靠的JN0-281软件版和資格考試領先提供商和驗證的JN0-281考試內容

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