Simulation JN0-281 Questions | JN0-281 Valid Test Guide

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q24-Q29):

NEW QUESTION # 24
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 place a MAC address that persistently causes network errors into a special protected VLAN.
B. This configuration enables the device to shut down the interface when a particular MAC address persistently sends broadcast traffic.
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.

Answer: D

Explanation:
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.

NEW QUESTION # 25
By default, which two statements are correct about BGP advertisements? (Choose two.)

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

Answer: C,D

Explanation:
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.

NEW QUESTION # 26
Which statement is correct about an IRB interface?

A. An IRB interface trunks together VLANs on different switches.
B. An IRB interface is a physical Layer 3 interface that connects VLANs together.
C. An IRB interface is a Layer 3 interface that can be used to route between VLANs.
D. An IRB interface switches traffic within the same VLAN.

Answer: C

Explanation:
An IRB (Integrated Routing and Bridging) interface provides routing functionality between VLANs at Layer 3, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
IRB Functionality:
The IRB interface enables routing between different VLANs by acting as a Layer 3 gateway. Traffic within the same VLAN is handled by Layer 2 switching, while traffic between VLANs is routed through the IRB interface.
Layer 3 Routing Between VLANs:
Each VLAN can be assigned an IP address on the IRB interface, which allows traffic to flow between VLANs based on Layer 3 IP routing.
Juniper
Reference: IRB Interface Configuration: Juniper supports IRB for inter-VLAN routing on devices like the EX and QFX series switches, facilitating Layer 3 communication in data centers.

NEW QUESTION # 27
Exhibit:

Referring to the exhibit, which two statements are correct about default BGP advertisements? (Choose two.)

A. When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.
B. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.
C. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.
D. When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

Answer: C,D

Explanation:
The exhibit shows a BGP peering scenario between three routers: router1 and router2 are part of the same AS (AS65000), while the SP router is in a different AS (AS65101). This indicates an EBGP (External BGP) peering between the SP router and router1, and IBGP between router1 and router2.
Step-by-Step Breakdown:
Next-Hop Behavior in BGP:
IBGP: In IBGP, the next-hop address is not modified when advertising routes within the same AS. Thus, when router1 advertises routes learned from router2 to the SP router, it will keep the next-hop address of router1, not router2.
EBGP: In EBGP, the next-hop address is modified. When router1 receives routes from the SP router, it will advertise them to router2 with the next-hop address of router1.
Route Propagation:
Routes received by router1 from router2 will be advertised to the SP router with router1 as the next hop.
Similarly, routes advertised by the SP router will be passed on to router2, with router1 remaining as the next hop.
Juniper Reference:
BGP Next-Hop: Juniper's BGP implementations follow standard BGP next-hop behavior, where the next-hop is modified in EBGP but not in IBGP, ensuring proper route advertisement across autonomous systems.

NEW QUESTION # 28
Exhibit:

Referring to the exhibit, which two statements are correct about default BGP advertisements? (Choose two.)

A. When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.
B. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.
C. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.
D. When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

Answer: C,D

Explanation:
The exhibit shows a BGP peering scenario between three routers: router1 and router2 are part of the same AS (AS65000), while the SP router is in a different AS (AS65101). This indicates an EBGP (External BGP) peering between the SP router and router1, and IBGP between router1 and router2.
Step-by-Step Breakdown:
Next-Hop Behavior in BGP:
IBGP: In IBGP, the next-hop address is not modified when advertising routes within the same AS. Thus, when router1 advertises routes learned from router2 to the SP router, it will keep the next-hop address of router1, not router2.
EBGP: In EBGP, the next-hop address is modified. When router1 receives routes from the SP router, it will advertise them to router2 with the next-hop address of router1.
Route Propagation:
Routes received by router1 from router2 will be advertised to the SP router with router1 as the next hop.
Similarly, routes advertised by the SP router will be passed on to router2, with router1 remaining as the next hop.
Juniper
Reference: BGP Next-Hop: Juniper's BGP implementations follow standard BGP next-hop behavior, where the next-hop is modified in EBGP but not in IBGP, ensuring proper route advertisement across autonomous systems.

NEW QUESTION # 29
......

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Simulation JN0-281 Questions | JN0-281 Valid Test Guide

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q24-Q29):

JN0-281 - Data Center, Associate (JNCIA-DC) –Valid Simulation Questions

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