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Juniper Certification
JN0-280 Exam
Juniper.JN0-280.v2025-04-14.q61 Dumps

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Question 51

Which route is preferred by the Junos OS software routing tables?

A.Static
B.Aggregate
C.Direct
D.BGP

Correct Answer: C

In Junos OS,direct routesare the most preferred routes in the routing table, having the highest priority.
Step-by-Step Breakdown:
* Direct Routes:
* Direct routes represent networks that are directly connected to the router's interfaces. Since these routes are directly accessible, they are assigned the highest priority and always take precedence over other types of routes.
* Preference Values:
* Direct routes have apreference of 0, which is the most preferred in Junos. Static routes, OSPF routes, and BGP routes have higher preference values and will only be used if there are no direct routes to the destination.
Juniper Reference:
* Direct Route Preference: In Junos,direct routesare always preferred over other routes, ensuring that the router forwards traffic through locally connected networks.

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Question 52

Which two protocols can you use for a data center underlay network? (Choose two)

A.EBGP
B.OSPF
C.EVPN
D.VXLAN

Correct Answer: A,B

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Question 53

Exhibit:

Referring to the exhibit, which next hop will be preferred in the routing table?

A.Next hop IP address 172.25.20.254 will be preferred.
B.Neither next hop will be preferred.
C.Next hop IP address 172.25.20.200 will be preferred.
D.Both next hops will be preferred.

Correct Answer: C

In the exhibit, we see a static route configuration with two possible next hops for the default route (0.0.0.0/0):
* next-hop 172.25.20.254with the default preference of 7.
* qualified-next-hop 172.25.20.200with a preference of 6.
Step-by-Step Breakdown:
* Preference Value:In Junos OS, thepreferencevalue is used to determine which route should be preferred in the routing table. The lower the preference value, the higher the priority for the route.
* Comparison:In this case:
* The next hop172.25.20.254has a preference of7.
* Thequalified-next-hop 172.25.20.200has a preference of6.
* Preferred Next Hop:Since172.25.20.200has a lower preference (6) compared to172.25.20.254(7), it will be the preferred next hop in the routing table, assuming both next hops are reachable.
Juniper Reference:
* Qualified Next Hop: In Junos, static routes with multiple next-hop options are selected based on the preference value, with the lower value being preferred.

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Question 54

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

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

Correct Answer: B

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Question 55

When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)

A.The BFD default minimum interval is 3.
B.You can configure BFD per interface within the protocol stanza.
C.The BFD operation always consists of minimum intervals and multipliers.
D.The BFD default multiplier is 5.

Correct Answer: B,C

Bidirectional Forwarding Detection (BFD)is a protocol used to detect faults in the forwarding path between two routers. It provides rapid failure detection, enhancing the performance of routing protocols like OSPF, BGP, and IS-IS.
Step-by-Step Breakdown:
* Per Interface Configuration:BFD can be configured on aper-interfacebasis within the protocol stanza (e.g., OSPF, BGP). This allows granular control over where BFD is enabled and the failure detection intervals for specific interfaces.
* Minimum Interval and Multiplier:BFD uses aminimum interval(the time between BFD control packets) and amultiplier(the number of missed packets before the path is declared down). The combination of these two defines the detection time for failures.
Juniper Reference:
* BFD Configuration: In Juniper, BFD is configurable within routing protocol stanzas, with the failure detection mechanism always based on minimum intervals and multipliers.

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