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Juniper JN0-280 Data Center, Associate (JNCIA-DC) Online Training

Question #1

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

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

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Correct Answer: C
Question #2

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

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

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Correct Answer: A
Question #3

What is the default route preference for a static route on a Junos device?

  • A . 130
  • B . 15
  • C . 10
  • D . 5

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Correct Answer: D
Question #4

Which statement is correct about a five-stage IP fabric topology?

  • A . There is a maximum of five hops between any end-devices
  • B . They are commonly referred to as interconnected data centers
  • C . There is a maximum of three hops between any end-devices
  • D . They are typically deployed in small to medium data centers

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Correct Answer: A
Question #5

What is the primary purpose of using aggregate routes in a network?

  • A . To dynamically adjust to network changes
  • B . To summarize and reduce the number of routes in the routing table
  • C . To filter unwanted traffic
  • D . To statically define a route to a specific destination

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Correct Answer: B
Question #6

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.

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Correct Answer: A
Question #7

What is the primary difference between IBGP and EBGP?

  • A . The way they advertise routes
  • B . The administrative distance
  • C . The use of AS_PATH attribute
  • D . The requirement for a full mesh topology

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Correct Answer: B
Question #8

What is an advantage of using BFD?

  • A . BFD is so lightweight that each protocol will generate its own unique BFD session by default, to replace its own hello messages.
  • B . BFD built to handle the routing table of the entire Internet, and can safely redistribute it into OSPF.
  • C . One BFD monitoring session can be used by multiple protocols.
  • D . BFD is built to handle the routing table of the entire Internet, unlike IGPS.

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Correct Answer: C
Question #9

Bidirectional Forwarding Detection (BFD) is primarily used for:

  • A . Encrypting data packets
  • B . Detecting slow links in the network
  • C . Quick failure detection in forwarding paths
  • D . Aggregating multiple links

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Correct Answer: C
Question #10

What is the function of the ‘Weight’ attribute in BGP, and where is it used in the route selection process?

  • A . It is used to prioritize routes received from different EBGP peers and is considered before the AS_PATH attribute.
  • B . It determines the stability of a route and is checked after the Local Preference attribute.
  • C . It is a Cisco-specific attribute used to prefer paths from one BGP speaker over another, evaluated before the Local Preference.
  • D . It is used to balance load among multiple links and is considered after the MED attribute.

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Correct Answer: C

Question #11

VLANs help in reducing which of the following? (Choose two)

  • A . Collision domains
  • B . Broadcast domains
  • C . Routing complexity
  • D . Encryption requirements

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Correct Answer: AB
Question #12

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.

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Correct Answer: B
Question #13

Which of the following BGP attributes is considered first in the route selection process?

  • A . Local Preference
  • B . AS Path Length
  • C . Origin
  • D . MED

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Correct Answer: A
Question #14

When troubleshooting issues with static routes, what is a key factor to check first?

  • A . If the routing table has enough memory
  • B . The correctness of the specified next-hop addresses
  • C . The speed of the router’s CPU
  • D . The number of aggregate routes configured

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Correct Answer: B
Question #15

What is the main advantage of using an Overlay Network in a data center?

  • A . It simplifies physical network design by allowing multiple virtual topologies over it.
  • B . It replaces the need for physical network infrastructure.
  • C . It offers higher physical bandwidth capacity.
  • D . It provides direct Internet access to applications.

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Correct Answer: A
Question #16

What are the different OSPF area types? (Choose two)

  • A . Stub Area
  • B . Not-So-Stubby Area (NSSA)
  • C . Default-Free Zone
  • D . Virtual Link Area

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Correct Answer: AB
Question #17

In OSPF, what is the function of the Link-State Database (LSDB)?

  • A . To store OSPF routing tables.
  • B . To maintain a list of OSPF neighbors.
  • C . To keep the topology structure of the network.
  • D . To log changes in network topology.

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Correct Answer: C
Question #18

What are two characteristics of a typical EBGP underlay fabric? (Choose two.)

  • A . Each device in an EBGP fabric will be configured in its own unique private AS.
  • B . Each device in an EBGP fabric will be configured to be part of the same private AS.
  • C . An EBGP fabric relies on an IGP to advertise loopback IPs.
  • D . An EBGP fabric does not require an IGP to advertise loopback IPs.

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Correct Answer: AD
Question #19

Referring to the exhibit, how many broadcast domains are present in the topology?

  • A . 0
  • B . 1
  • C . 2
  • D . 3

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Correct Answer: B
Question #20

How can OSPF be configured to prefer one route over another?

  • A . By setting a higher cost on the preferred route.
  • B . By configuring route redistribution.
  • C . By adjusting interface bandwidth.
  • D . By setting a lower cost on the preferred route.

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Correct Answer: D

Question #21

In the context of protocol-independent routing, what is the main difference between static and generated routes?

  • A . Static routes require manual configuration, while generated routes are created dynamically.
  • B . Static routes are used for load balancing, while generated routes are not.
  • C . Generated routes support summarization, while static routes do not.
  • D . Generated routes are manually configured, while static routes are automatically created.

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Correct Answer: A
Question #22

Which LSA types are associated with OSPF? (Choose three)

  • A . Router LSA (Type 1)
  • B . Network LSA (Type 2)
  • C . Summary LSA (Type 3)
  • D . External LSA (Type 5)

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Correct Answer: ABC
Question #23

Referring to the exhibit, which statement is correct?

  • A . The ge-0/0/0 interface has been explicitly assigned to a VLAN named default.
  • B . The default VLAN is a user defined VLAN name.
  • C . The asterisk indicates that the interface is active.
  • D . The ge-0/0/12 interfaces is an access port.

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Correct Answer: C
Question #24

Which of the following is a key benefit of implementing High Availability (HA) in a network?

  • A . Reduced network security
  • B . Increased network downtime
  • C . Enhanced data redundancy
  • D . Slower data recovery

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Correct Answer: C
Question #25

In OSPF, which command is commonly used to monitor neighbor relationships?

  • A . show ip ospf neighbors
  • B . show ospf database
  • C . show ip route ospf
  • D . show ospf interfaces

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Correct Answer: A
Question #26

What protocol and port does BGP use for control plane communication?

  • A . protocol TCP, port 179
  • B . protocol UDP, port 179
  • C . protocol TCP, port 159
  • D . protocol UDP, port 159

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Correct Answer: A
Question #27

Referring to the exhibit, how many milliseconds will pass before the BGP neighbor is considered dead?

  • A . 1000ms
  • B . 9000ms
  • C . 2000ms
  • D . 3000ms

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Correct Answer: D
Question #28

What is the purpose of using route reflectors in BGP?

  • A . To encrypt BGP messages
  • B . To reduce the number of required IBGP sessions in a network
  • C . To increase the speed of BGP convergence
  • D . To automatically select the best route

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Correct Answer: B
Question #29

What does the “qualified-next-hop” feature do when configuring a static route?

  • A . It allows you to specify an independent route preference value for an additional next hop.
  • B . It specifies the IP address of the directly connected device.
  • C . It instructs the device to verify the next-hop is reachable before activating the route.
  • D . It instructs the device to looks up a static route’s next-hop that is not directly connected.

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Correct Answer: A
Question #30

In the context of Ethernet bridging on Junos devices, what is the purpose of the Spanning Tree Protocol (STP)?

  • A . To prevent routing loops.
  • B . To provide a mechanism for VLAN tagging.
  • C . To prevent Layer 2 switching loops.
  • D . To filter MAC addresses.

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Correct Answer: C

Question #31

Which statement is correct about the OSPF link-state database?

  • A . Each router within the same area must maintain a unique copy of the link-state database.
  • B . Each router within the same area must maintain an identical copy of the link-state database.
  • C . Each router within the OSPF domain must maintain a unique copy of the link-state database.
  • D . Each router within the OSPF domain must maintain an identical copy of the link-state database.

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Correct Answer: B
Question #32

In a Spine/Leaf IP-Fabric architecture, what is the primary role of the leaf switches?

  • A . To provide direct connectivity to servers.
  • B . To interconnect different data centers.
  • C . To perform deep packet inspection.
  • D . To manage the overall data center network.

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Correct Answer: A
Question #33

What is the primary function of a VLAN?

  • A . To encrypt network traffic.
  • B . To provide a routing mechanism between different networks.
  • C . To segment a network into multiple broadcast domains.
  • D . To control network traffic based on MAC addresses.

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Correct Answer: C
Question #34

What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?

  • A . They redistribute routes between OSPF and non-OSPF networks.
  • B . They are responsible for generating LSAs for external routes.
  • C . They reduce the number of adjacencies on broadcast networks.
  • D . They determine the shortest path first algorithm.

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Correct Answer: C
Question #35

Which two statements are correct about BGP? (Choose two.)

  • A . IBGP peers do not advertise routes learned from IBGP peers to other IBGP peers.
  • B . EBGP uses the AS path to avoid loops.
  • C . IBGP sessions are typically established between physical router interfaces.
  • D . EBGP sessions are typically established between router loopback interfaces.

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Correct Answer: AB
Question #36

Which of the following are correct about OSPF router ID selection? (Choose two)

  • A . It can be manually configured.
  • B . It is chosen based on the highest IP address of any active interface by default.
  • C . It is always the IP address of the loopback interface.
  • D . It is selected based on the lowest MAC address.

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Correct Answer: AB
Question #37

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.

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Correct Answer: B
Question #38

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.

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Correct Answer: AD
Question #39

Which command on a router is used to view the current routing table?

  • A . show routing-table
  • B . show route
  • C . display ip routing-table
  • D . check route information

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Correct Answer: B
Question #40

What does filter-based forwarding in networking typically allow?

  • A . Forwarding decisions based on MAC addresses
  • B . Load balancing across multiple CPUs
  • C . Routing decisions based on extended criteria like packet headers
  • D . Aggregation of multiple routes into a single entry

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Correct Answer: C
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