JUNIPER JN0-281 QUESTIONS - TRY OUR REAL JN0-281 DUMPS [2025]

Juniper JN0-281 Questions - Try Our Real JN0-281 Dumps [2025]

Juniper JN0-281 Questions - Try Our Real JN0-281 Dumps [2025]

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Tags: Verified JN0-281 Answers, JN0-281 New Question, JN0-281 Reliable Test Duration, JN0-281 Test Questions Pdf, Exam JN0-281 Cost

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q22-Q27):

NEW QUESTION # 22
Which statement is correct about areas in OSPF?

  • A. OSPF areas are used to reduce the size of the link-state database.
  • B. An OSPF area is used to segment Layer 2 broadcast domains.
  • C. OSPF areas are used to isolate the effects of a broadcast storm.
  • D. An OSPF area is used to signify the autonomous system to which each device belongs.

Answer: A

Explanation:
In OSPF (Open Shortest Path First), areas are used to segment a network into smaller, more manageable pieces to improve scalability. By dividing a network into areas, OSPF can reduce the size of the link-state database (LSDB), which helps routers process updates more efficiently.
Step-by-Step Breakdown:
Purpose of OSPF Areas:
OSPF areas allow for hierarchical routing within the OSPF domain. Routers in the same area have identical LSDBs, but routers in different areas do not exchange full link-state information. Instead, they exchange summarized routes, which reduces the LSDB size and CPU/memory usage.
Benefits:
Reducing the LSDB size improves scalability and ensures faster convergence in larger networks. Area 0 is the backbone area, and all other areas must connect to it, forming a hierarchical structure. Juniper Reference: OSPF Configuration: Areas in OSPF are configured to optimize network performance by limiting the scope of link-state advertisements (LSAs) to within an area.


NEW QUESTION # 23
What information in the Ethernet header is used to populate the bridging table?

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

Answer: B

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 # 24
Referring to the exhibit, how many broadcast domains are present in the topology?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: D


NEW QUESTION # 25
Exhibit:

Referring to the exhibit, which statement is correct?

  • A. BGP group 1 requires a type internal parameter.
  • B. BGP group 1 requires a type external parameter.
  • C. The configuration will commit successfully and BGP group 1 will operate as EBGP.
  • D. The configuration will commit successfully and BGP group 1 will operate as IBGP.

Answer: C

Explanation:
In the exhibit, BGP is configured with local AS 65101 and a neighbor at 172.16.1.1 in peer AS 65201. This setup involves two different Autonomous Systems (AS), indicating an External BGP (EBGP) configuration.
Step-by-Step Breakdown:
EBGP vs. IBGP:
EBGP is used between routers in different ASes. In this case, the local AS is 65101 and the peer AS is 65201, meaning the BGP session is EBGP.
IBGP is used between routers within the same AS, which is not applicable here as the AS numbers are different.
BGP Group Configuration:
The configuration does not require a type external parameter because Junos OS automatically recognizes the session as EBGP when the local and peer AS numbers are different.
The BGP session will operate as EBGP, and the configuration will commit successfully.
Juniper Reference:
BGP Configuration: In Juniper, EBGP is automatically recognized when the local and peer AS numbers differ, without needing to specify type external.


NEW QUESTION # 26
What is the default route preference of a static route in the Junos OS?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: D

Explanation:
In Junos OS, the default route preference for a static route is 5. Route preference values are used to determine which route should be installed in the routing table when multiple routes to the same destination are available.
Step-by-Step Breakdown:
Static Route Preference:
A static route, by default, has a preference of 5, making it a highly preferred route. Lower preference values are more preferred in Junos, meaning static routes take precedence over most dynamic routing protocol routes, such as OSPF (preference 10) or BGP (preference 170).
Route Preference:
Route preference is a key factor in the Junos routing decision process. Routes with lower preference values are preferred and installed in the forwarding table.
Juniper Reference:
Static Routes: In Junos, the default preference for static routes is 5, making them more preferred than most dynamic routes.


NEW QUESTION # 27
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