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

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Question 56

What is the main purpose of Bidirectional Forwarding Detection (BFD)?

A.to detect network path failures
B.to determine if the forwarding routes are correct
C.to detect the forwarding protocol
D.to determine packet round-trip latency

Correct Answer: A

Bidirectional Forwarding Detection (BFD)is a network protocol used to detect failures in the network path between two devices quickly.
Step-by-Step Breakdown:
* Path Failure Detection:BFD provides a low-overhead mechanism for detecting failures in forwarding paths across Layer 3 networks. It is much faster than traditional routing protocol timers and can detect failures within milliseconds.
* BFD in Routing:BFD can be integrated with routing protocols like OSPF, BGP, or IS-IS to trigger a faster convergence when a network path goes down.
Juniper Reference:
* BFD Configuration: Juniper devices use BFD to monitor network paths and ensure fast failure detection, enhancing network resilience.

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Question 57

You are troubleshooting a downed BGP session.

Referring to the exhibit, what is the cause of the problem?

A.The UDP session between the peers has not been established.
B.The local peer has sent an Open message but not received one from the remote peer.
C.The TCP session between the peers has not been established.
D.The local peer has sent an Update message but not received one from the remote peer.

Correct Answer: C

The BGP session in the exhibit shows the state asConnect, which indicates that theTCP sessionbetween the BGP peers has not been fully established.
Step-by-Step Breakdown:
* BGP State "Connect":
* TheConnectstate is the second stage in the BGP finite state machine (FSM). At this stage, BGP is trying to establish aTCP sessionwith the peer, but the session has not yet been successfully established.
* A successful TCP three-way handshake (SYN, SYN-ACK, ACK) is required before BGP can progress to theOpenSentstate, where the peers exchange BGP Open messages.
* Possible Causes:
* A firewall blocking TCP port179.
* Incorrect IP addresses or network connectivity issues between the BGP peers.
Juniper Reference:
* BGP Troubleshooting: In Junos, if a BGP session is stuck in theConnectstate, the issue is likely due to a failure in establishing the underlying TCP connection.

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Question 58

Which two statements are correct about VLAN tags? (Choose two.)

A.VLAN tags carry a VLAN ID and priority.
B.VLAN tags are required on access ports.
C.VLAN tags require multiple forwarding tables.
D.VLAN tags can be inserted or removed by trunk interfaces.

Correct Answer: A,D

VLAN tagsare used in Ethernet frames to identify and differentiate traffic between multiple VLANs. They are especially important for devices like switches that handle multiple VLANs on the same physical link.
Step-by-Step Breakdown:
* VLAN Tag Contents:
* VLAN ID: The tag contains a 12-bit VLAN ID field that identifies the VLAN to which the frame belongs.
* Priority: The tag also includes a 3-bit priority field (also known as 802.1p priority) used for QoS (Quality of Service) to prioritize traffic.
* Trunk Ports and VLAN Tagging:
* Trunk Portsare used to carry traffic for multiple VLANs across a single link. These interfaces insert (tag) VLAN identifiers into frames when they leave the switch and remove (untag) them when frames enter the switch.
* Access Ports:VLAN tags are typically not used onaccess ports(ports that connect to end devices) since those ports are configured to be part of a single VLAN, and the traffic doesn't need VLAN tags.
Juniper Reference:
* VLAN Tagging: Juniper switches support VLAN tagging and ensure that frames are tagged or untagged as they traverse trunk or access ports, respectively.

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Question 59

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 a connection between the spine nodes
C.Remove the connection between the leaf nodes
D.Add two connections between the spine nodes

Correct Answer: C

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Question 60

In the context of Layer 2 switching, what does RSTP stand for?

A.Routing Switch Transport Protocol
B.Redundant Switching Tree Protocol
C.Rapid Spanning Tree Protocol
D.Resilient Switching Transport Protocol

Correct Answer: C

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