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Data Center, Associate (JNCIA-DC)

The Data Center track enables you to demonstrate competence with data center technologies and related configuration and troubleshooting skills. JNCIA-DC, the associate-level certification in this track, is designed for data center networking professionals with introductory-level knowledge of the Juniper Networks Junos software and data center devices. The written exam verifies your understanding of data center technologies, related platform configuration, and troubleshooting skills.

Exam Information

Exam Code: JN0-280
Prerequisite Certification: None
Delivered by Pearson VUE
Exam Length: 90 minutes
Exam Type: 65 multiple-choice questions
Software Versions: Junos 20.4

JNCIA-DC JN0-280 Exam Topics

Data Center Architectures

Identify concepts and general features of Data Center architectures

• Traditional Architectures (multi-tier)
• IP-Fabric Architectures (Spine/Leaf)
• Layer 2 and Layer 3 strategies
• Overlay Network versus Underlay Network (Very Basic)
• EVPN/VXLAN basics/purpose

Layer 2 Switching, VLANs and Security  

Identify the concepts, operation, or functionality of Layer 2 switching for the Junos OS

• Ethernet switching/bridging concepts and operations

Identify the concepts, benefits, or functionality of VLANs

• Port modes
• VLAN Tagging
• IRB

Identify the concepts, benefits, or functionality of Layer 2 Security

• MACsec
• MAC address control/filtering
• Storm Control

Describe how to configure, monitor, or troubleshoot Layer 2 switching, VLANs, or security

• Ethernet switching/bridging
• VLANs
• Layer 2 security features

Protocol-Independent Routing

Identify the concepts, operation, or functionality of various protocol-independent routing components

• Static, aggregate, and generated routes
• Martian addresses
• Routing instances, including RIB groups
• Load balancing
• Filter-based forwarding

Describe how to configure, monitor, or troubleshoot various protocol-independent routing components

• Static, aggregate, and generated routes
• Load balancing

Data Center Routing Protocols BGP/OSPF

Identify the concepts, operation, or functionality of OSPF

• Link-state database
• OSPF packet types
• Router ID
• Adjacencies and neighbors
• Designated router (DR) and backup designated router (BDR)
• OSPF area and router types
• LSA packet types

Describe how to configure, monitor, or troubleshoot OSPF

• Areas, interfaces, and neighbors
• Additional basic options
• Routing policy application
• Troubleshooting tools

Identify the concepts, operation, or functionality of BGP

• BGP basic operation
• BGP message types
• Attributes
• Route/path selection process
• IBGP and EBGP functionality and interaction

Describe how to configure, monitor, or troubleshoot BGP

• Groups and peers
• Additional basic options
• Routing policy application

High Availability (HA)

Identify the concepts, benefits, applications, or requirements of high availability

• Link aggregation groups (LAG)
• Graceful restart (GR)
• Bidirectional Forwarding Detection (BFD)
• Virtual Chassis

Describe how to configure, monitor, or troubleshoot high availability components

• Link aggregation groups (LAG)
• Graceful restart (GR)
• Bidirectional Forwarding Detection (BFD)

View Online Data Center, Associate (JNCIA-DC) JN0-280 Free Questions

1. What are two common reasons for BGP routes to be in the hidden state? (Choose two.)
A. Routes are being rejected by a policy
B. Routes are being filtered from the inet.2 routing table
C. The next hop is unresolvable
D. The BGP neighbor is in a different autonomous system
Answer: A, C
 
2. You have configured a load balancing policy. Which statement is correct about applying the policy?
A. The policy is applied as an export policy under the routing protocol’s hierarchy.
B. The policy is applied as an export policy under routing-options forwarding table.
C. The policy is applied as an import policy under the routing protocol’s hierarchy.
D. The policy is applied as an import policy under routing-options forwarding table.
Answer: B
 
3. Under which Junos hierarchy is a static route configured?
A. system
B. routing-instances
C. routing-options
D. protocols
Answer: C
 
4. How does a layer 2 switch populate its bridge table?
A. It stores the protocol number of frames traversing the network.
B. It stores both the source and destination MAC addresses of frames traversing the network.
C. It stores the destination MAC address of frames traversing the network.
D. It stores the source MAC address of frames traversing the network.
Answer: D
 
5. In the Junos OS, what is the default behavior of a switch when it receives a frame with an unknown destination MAC address?
A. It discards the frame.
B. It floods the frame out of all ports except the one it was received on.
C. It sends the frame to its default gateway.
D. It buffers the frame until the MAC address can be learned.
Answer: B
 
6. Which two protocols can you use for a data center underlay network? (Choose two)
A. EBGP
B. OSPF
C. VXLAN
D. EVPN
Answer: A, B
 
7. In the context of data center networking, what is the primary purpose of an Underlay Network?
A. To provide a physical infrastructure for an Overlay Network.
B. To handle external network connections exclusively.
C. To facilitate virtual machine migrations.
D. To encrypt data traffic between servers.
Answer: A
 
8. With regards to graceful restart, which two statements are true? (Choose two.)
A. A supported routing protocol, such as BGP, must be operational for graceful restart to work.
B. NSR must be enabled for graceful restart to work.
C. Dual routing engines are required for graceful restart to work.
D. The network topology must be stable for graceful restart to work.
Answer: A, D
 
9. EVPN/VXLAN is primarily used in modern data centers to:
A. Increase the physical distance between data centers.
B. Provide Layer 2 connectivity over a Layer 3 network.
C. Replace traditional routing protocols.
D. Enhance the physical security of the data center.
Answer: B
 
10. Which two statements are correct about aggregated Ethernet bundles? (Choose two.)
A. You must enable the chassis to support aggregated Ethernet interfaces.
B. You must purchase a services license for the chassis to support aggregate Ethernet interfaces.
C. You must specify which interfaces are members of a specific aggregated Ethernet bundle.
D. You must enable LACP when configuring aggregated Ethernet bundles.
Answer: A, C