Get 100% Passing Success With True JN0-280 Exam! [Apr-2025]
Juniper JN0-280 PDF Questions - Exceptional Practice To Data Center, Associate (JNCIA-DC)
The JN0-280 certification exam covers a wide range of topics including data center architectures, data center networking, storage technologies, virtualization, and automation. Candidates who pass this certification exam will have a deep understanding of data center technologies and will be able to design, implement, and manage data center networks. The JNCIA-DC certification is an excellent stepping stone for individuals who want to pursue advanced certifications in data center technologies such as the Juniper JNCIS-DC or JNCIP-DC.
The JN0-280 certification exam is also known as the Data Center, Associate (JNCIA-DC) certification exam. JN0-280 exam covers a range of topics, including data center architecture, data center networking, data center storage, and data center virtualization. Candidates are required to have a solid understanding of these topics to pass the exam.
NEW QUESTION # 112
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. Virtual Chassis
- C. link aggregation groups
- 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 aGR 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 # 113
A switch receives a frame with a MAC address of FF-FF-FF-FF-FF-FF. Which action will the switch take on this frame?
- A. It will flood it out of all interfaces.
- B. It will flood it out of all interfaces, except for the directly connected VLAN.
- C. It will flood it out of all interfaces, except for the ingress interface.
- D. It will flood it out of all interfaces, except for the next-hop interface.
Answer: C
Explanation:
AMAC address of FF-FF-FF-FF-FF-FFis the Ethernetbroadcast address. When a switch receives a frame with this destination MAC address, it is required to forward the frame to all interfaces except the one it was received on.
Step-by-Step Breakdown:
* Broadcast Frame Handling:When a frame with the broadcast MAC address is received, the switch will flood it out of all active ports that belong to the same VLAN as the incoming frame. The broadcast frame is not sent back out of the ingress interface (the interface where the frame was originally received).
* Purpose of Flooding:Broadcasting is used to ensure that the frame reaches all devices within the broadcast domain (all devices within the same VLAN), which may not have a specific entry for the MAC address in their MAC address table.
Juniper Reference:
* Layer 2 Frame Forwarding: Juniper switches flood broadcast frames to all ports in the same VLAN, except the port the frame was received on.
NEW QUESTION # 114
Which of the following are features of storm control on Junos switches? (Choose two)
- A. It automatically reroutes traffic during a storm.
- B. It can be configured to shut down a port during a storm.
- C. It encrypts broadcast and multicast traffic.
- D. It supports thresholds for broadcast, multicast, and unknown unicast traffic.
Answer: B,D
NEW QUESTION # 115
When configuring MAC address filtering on a Junos switch, which feature is primarily used?
- A. Firewall filters
- B. Port security
- C. RADIUS
- D. Access Control Lists (ACLs)
Answer: B
NEW QUESTION # 116
What are three correct layer names used in legacy hierarchical network design? (Choose three.)
- A. Modular layer
- B. Function layer
- C. Core layer
- D. Access layer
- E. Aggregation layer
Answer: C,D,E
Explanation:
Inlegacy hierarchical network design, three key layers are used to create a scalable and structured network:
Step-by-Step Breakdown:
* Access Layer:
* The access layer is where end devices, such as computers and IP phones, connect to the network.
It typically involves switches that provide connectivity for devices at the edge of the network.
* Aggregation Layer (Distribution Layer):
* The aggregation layer (also called the distribution layer) aggregates traffic from multiple access layer devices and applies policies such as filtering and QoS. It also provides redundancy and load balancing.
* Core Layer:
* The core layer provides high-speed connectivity between aggregation layer devices and facilitates traffic within the data center or between different network segments.
Juniper Reference:
* Legacy Hierarchical Design: Juniper networks often follow the traditional three-layer design (Access, Aggregation, and Core) to ensure scalability and high performance.
NEW QUESTION # 117
What is the primary purpose of an IRB Layer 3 interface?
- A. to provide port security
- B. to provide a default VLAN ID
- C. to provide load balancing
- D. to provide inter-VLAN routing
Answer: D
Explanation:
The primary purpose of anIRB (Integrated Routing and Bridging)interface is to enableinter-VLAN routing in a Layer 3 environment. An IRB interface in Junos combines the functionality of both Layer 2 bridging (switching) and Layer 3 routing, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
* VLANs and Layer 2 Switching:Devices within the same VLAN can communicate directly through Layer 2 switching. However, communication between devices in different VLANs requires Layer 3 routing.
* IRB Interface for Inter-VLAN Routing:The IRB interface provides a Layer 3 gateway for each VLAN, enabling routing between VLANs. Without an IRB interface, devices in different VLANs would not be able to communicate.
* Configuration:In Juniper devices, the IRB interface is configured by assigning Layer 3 IP addresses to it. These IP addresses serve as the default gateway for devices in different VLANs.
Example configuration:
set interfaces irb unit 0 family inet address 192.168.1.1/24
set vlans vlan-10 l3-interface irb.0
This allows VLAN 10 to use the IRB interface for routing.
Juniper Reference:
* IRB Use Case: Inter-VLAN routing is essential in data centers where multiple VLANs are deployed, and Juniper's EX and QFX series switches support IRB configurations for this purpose.
NEW QUESTION # 118
What is the primary difference between IBGP and EBGP?
- A. The way they advertise routes
- B. The use of AS_PATH attribute
- C. The requirement for a full mesh topology
- D. The administrative distance
Answer: D
NEW QUESTION # 119
Which two statements are true about how switches handle Layer 2 traffic? (Choose two.)
- A. The MAC address is learned based on the destination MAC address.
- B. Traffic is forwarded based on the destination MAC address.
- C. Traffic is forwarded based on the source MAC address.
- D. The MAC address is learned based on the source MAC address.
Answer: B,D
Explanation:
In Layer 2 switching, switches learn MAC addresses based on thesource MAC addressof incoming frames and forward frames based on thedestination MAC address.
Step-by-Step Breakdown:
* MAC Learning:When a switch receives a frame, it records thesource MAC addressand the port on which it arrived. This allows the switch to know where to send traffic destined for that MAC address.
* Forwarding Based on Destination:The switch then looks at thedestination MAC addressand forwards the frame out of the port associated with that MAC address. If the MAC is unknown, the switch floods the frame to all ports.
Juniper Reference:
* Layer 2 Switching: Juniper switches use source MAC addresses to build MAC tables and forward traffic based on the destination MAC address.
NEW QUESTION # 120
You want to enable a Junos device to support aggregated Ethernet interfaces. In this scenario, which configuration hierarchy would you use?
- A. [edit switch-options]
- B. [edit interfaces]
- C. [edit chassis]
- D. [edit system]
Answer: C
Explanation:
To configureaggregated Ethernet (AE) interfaceson a Junos device, the configuration is done under the[edit chassis]hierarchy.
Step-by-Step Breakdown:
* Chassis Configuration:Thechassisconfiguration is responsible for enabling the hardware to support Link Aggregation Groups (LAGs), allowing multiple physical interfaces to be bundled into a single logical interface for load balancing and redundancy.
* Command Example:
set chassis aggregated-devices ethernet device-count <number>
* This command enables a specific number of aggregated Ethernet interfaces on the device.
Juniper Reference:
* LAG Configuration in Junos: Thechassishierarchy is used to allocate and manage hardware resources for aggregated Ethernet interfaces in Juniper devices.
NEW QUESTION # 121
When troubleshooting issues with static routes, what is a key factor to check first?
- A. The speed of the router's CPU
- B. The correctness of the specified next-hop addresses
- C. The number of aggregate routes configured
- D. If the routing table has enough memory
Answer: B
NEW QUESTION # 122
Referring to the exhibit, which two statements are correct about the IP fabric? (Choose two.)
- A. All traffic must traverse the super spine devices.
- B. This is a three-stage IP fabric.
- C. This is a five-stage fabric.
- D. Only traffic between pods must traverse the super spine devices.
Answer: C,D
NEW QUESTION # 123
When configuring static routes, which command is typically used?
- A. set protocols static route
- B. set firewall filter
- C. set route aggregate
- D. set routing-options rib-groups
Answer: A
NEW QUESTION # 124
What is the main advantage of using MACsec?
- A. It allows for the use of longer cable runs.
- B. It provides Layer 2 encryption for data confidentiality and integrity.
- C. It increases the speed of the network.
- D. It creates multiple virtual networks over a single physical infrastructure.
Answer: B
NEW QUESTION # 125
Which statement is correct about member interfaces when creating a LAG?
- A. The interface's MTU settings must match on all member interfaces.
- B. Member interfaces must all be allocated on the same chassis when using a Virtual Chassis.
- C. The interface's duplex settings and link speed must be the same on all member interfaces.
- D. Member interfaces must all be allocated on the same PFE.
Answer: C
Explanation:
When creating aLAG (Link Aggregation Group)in Junos, theduplex settingsandlink speedmust be the same across all member interfaces.
Step-by-Step Breakdown:
* LAG Overview:A LAG combines multiple physical interfaces into a single logical interface to increase bandwidth and provide redundancy. All member links must act as a single cohesive unit.
* Interface Requirements:
* Duplex: All member interfaces must operate in the same duplex mode (either full-duplex or half- duplex). Mismatched duplex settings can cause performance issues, packet drops, or interface errors.
* Link Speed: All interfaces in the LAG must have the same link speed (e.g., all interfaces must be
1 Gbps or 10 Gbps). Mismatched speeds would prevent the interfaces from functioning correctly within the LAG.
* Configuration and Validation: Ensure that all member interfaces have identical settings before adding them to the LAG. These settings can be checked using the show interfaces command, and the LAG can be configured using:
set interfaces ae0 aggregated-ether-options link-speed 10g
set interfaces ge-0/0/1 ether-options 802.3ad ae0
Juniper Reference:
* LAG Configuration: Duplex and link speed must be consistent across member interfaces to ensure proper LAG operation in Juniper devices.
NEW QUESTION # 126
In the context of Link Aggregation Groups (LAG), what is the primary purpose of LACP?
- A. To increase the error rate in data transmission
- B. To dynamically manage the bundling of several physical ports
- C. To reduce the speed of data transfer
- D. To provide a method for encrypting data packets
Answer: B
NEW QUESTION # 127
Which statement is correct about a five-stage IP fabric topology?
- A. There is a maximum of three hops between any end-devices
- B. They are commonly referred to as interconnected data centers
- C. There is a maximum of five hops between any end-devices
- D. They are typically deployed in small to medium data centers
Answer: C
NEW QUESTION # 128
What is the behavior of the default export policy for OSPF?
- A. Accept all routes.
- B. Reject all routes.
- C. Redistribute all routes.
- D. Forward all routes.
Answer: B
Explanation:
In Junos, thedefault export policyforOSPFis toreject all routesfrom being exported.
Step-by-Step Breakdown:
* Default Export Policy:By default,OSPFin Junos does not export any routes to other routing protocols or neighbors. This is a safety mechanism to prevent unintended route advertisements.
* Custom Export Policies:
* If you need to export routes, you must create a customexport policythat explicitly defines which routes to advertise.
* Example: You can create an export policy to redistribute static or connected routes into OSPF.
Juniper Reference:
* OSPF Export Behavior: In Juniper devices, the default policy for OSPF is to reject route advertisements unless explicitly configured otherwise through custom policies.
NEW QUESTION # 129
In troubleshooting a Virtual Chassis setup, what is a common issue to look for?
- A. Incompatible software versions between member switches
- B. Use of copper cables for inter-switch connections
- C. Activation of all ports for Virtual Chassis connections
- D. Too many switches in a single Virtual Chassis configuration
Answer: A
NEW QUESTION # 130
Referring to the exhibit, which statement is correct?
- A. The default VLAN is a user defined VLAN name.
- B. The ge-0/0/12 interfaces is an access port.
- C. The ge-0/0/0 interface has been explicitly assigned to a VLAN named default.
- D. The asterisk indicates that the interface is active.
Answer: D
NEW QUESTION # 131
What are two common reasons for BGP routes to be in the hidden state? (Choose two.)
- A. The next hop is unresolvable
- B. Routes are being filtered from the inet.2 routing table
- C. The BGP neighbor is in a different autonomous system
- D. Routes are being rejected by a policy
Answer: A,D
NEW QUESTION # 132
How does a layer 2 switch populate its bridge table?
- A. It stores the source MAC address of frames traversing the network.
- B. It stores the protocol number of frames traversing the network.
- C. It stores the destination MAC address of frames traversing the network.
- D. It stores both the source and destination MAC addresses of frames traversing the network.
Answer: A
NEW QUESTION # 133
When a MAC limiting violation occurs, the switch performs which two actions by default? (Choose two.)
- A. No logging takes place.
- B. It drops the packet.
- C. The port is disabled.
- D. It causes Layer 2 loops.
Answer: B,C
Explanation:
When aMAC limiting violationoccurs on a Juniper switch, the switch will perform the following actions by default:
Step-by-Step Breakdown:
* Port Disabled:When the number of MAC addresses on an interface exceeds the configured limit, the port isautomatically disabledto prevent further violations. This is a protective mechanism to prevent MAC address flooding.
* Packet Dropped:Additionally, packets from the violating MAC address aredroppedto prevent any further communication from that address. This ensures that only valid MAC addresses are allowed to communicate through the interface.
* Example Configuration:
set ethernet-switching-options secure-access-port interface <interface-name> mac-limit 5
* If more than five MAC addresses are learned, the port is disabled, and excess packets are dropped.
Juniper Reference:
* MAC Limiting: When the switch detects a MAC limiting violation, it disables the port and drops further packets from the violating MAC addresses to maintain network security.
NEW QUESTION # 134
Which of the following BGP attributes is considered first in the route selection process?
- A. MED
- B. Local Preference
- C. Origin
- D. AS Path Length
Answer: B
NEW QUESTION # 135
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The JN0-280 exam is an excellent starting point for individuals looking to pursue a career in data center networking. It demonstrates a candidate's knowledge and skills in the key areas of data center operations and architecture, and it provides a solid foundation for further certification and career advancement. With the JN0-280 certification, candidates can expect to have a good understanding of the fundamental concepts and practices of data center networking, making them valuable assets to any organization.
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