JUNIPER - PERFECT JN0-281 TEST SIMULATOR

Juniper - Perfect JN0-281 Test Simulator

Juniper - Perfect JN0-281 Test Simulator

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q83-Q88):

NEW QUESTION # 83
Referring to the exhibit, what needs to be done to make this a valid IP fabric?

  • A. Remove one of the redundant links between a leaf node and a spine node
  • B. Add two connections between the spine nodes
  • C. Add a connection between the spine nodes
  • D. Remove the connection between the leaf nodes

Answer: D


NEW QUESTION # 84
Referring to the exhibit, why are the BGP routes hidden?

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

Answer: A

Explanation:
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>.


NEW QUESTION # 85
What is the first route selection mechanism for IBGP?

  • A. MED
  • B. origin
  • C. local preference
  • D. as path

Answer: C


NEW QUESTION # 86
You want to minimize topology disruptions in your network when the rpd process restarts on a device. Which service would accomplish this task?

  • A. graceful restart (GR)
  • B. link aggregation groups
  • C. Virtual Chassis
  • D. Bidirectional Forwarding Detection (BFD)

Answer: A

Explanation:
Graceful Restart (GR) is a feature that allows a router to maintain forwarding even when the routing process (e.g., the rpd process in Junos) is restarting, minimizing disruption to the network.
Step-by-Step Breakdown:
Graceful Restart Function:
During a GR event, the forwarding plane continues to forward packets based on existing routes, while the control plane (rpd process) is restarting. This prevents traffic loss and maintains routing stability.
Minimizing Disruptions:
GR is particularly useful in ensuring continuous packet forwarding during software upgrades or routing protocol process restarts.
Juniper Reference:
Graceful Restart in Junos: GR ensures high availability by maintaining forwarding continuity during control plane restarts, enhancing network reliability.


NEW QUESTION # 87
What information in the Ethernet header is used to populate the bridging table?

  • A. destination address
  • B. type
  • C. source address
  • D. protocol

Answer: C

Explanation:
The source MAC address in the Ethernet header is used to populate the bridging table (also called the MAC address table) on a switch. When a frame arrives at a switch, the switch examines the source MAC address and records it along with the ingress port in its MAC address table.
Step-by-Step Breakdown:
Learning Process:
When an Ethernet frame arrives on a switch port, the switch looks at the source MAC address and adds this MAC address to the MAC table along with the port it was received on. This process is called MAC learning.
Purpose:
The switch uses this information to determine the correct port to send frames destined for that MAC address in future transmissions, thus ensuring efficient Layer 2 forwarding. Juniper Reference: Ethernet Switching: Juniper switches use source MAC addresses to build and maintain the MAC address table, which is essential for Layer 2 switching.


NEW QUESTION # 88
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