Back

Practice Free JN0-281 Exam Online Questions

Question #31

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.

Reveal Solution Hide Solution

Correct Answer: C
Question #32

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

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

Reveal Solution Hide Solution

Correct Answer: AB
Question #33

Martian addresses are:

  • A . Special routes for interplanetary communication.
  • B . Addresses used in MPLS.
  • C . Unroutable addresses that are generally filtered by routers.
  • D . Addresses used for load balancing.

Reveal Solution Hide Solution

Correct Answer: C
Question #34

In a traditional multi-tier architecture, which layer is responsible for aggregating access layers and providing connectivity to the core layer?

  • A . Core Layer
  • B . Distribution Layer
  • C . Access Layer
  • D . Edge Layer

Reveal Solution Hide Solution

Correct Answer: B
Question #35

Which of the following statements are correct about the Spine/Leaf architecture? (Choose two)

  • A . The Spine layer switches interconnect various Leaf switches.
  • B . Each Leaf switch is directly connected to every server in the data center.
  • C . The architecture reduces the need for inter-switch link (ISL) redundancy.
  • D . Spine switches can connect directly to the data center’s external network.

Reveal Solution Hide Solution

Correct Answer: AD
Question #36

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 . The MAC address is learned based on the source MAC address.
  • C . Traffic is forwarded based on the source MAC address.
  • D . Traffic is forwarded based on the destination MAC address.

Reveal Solution Hide Solution

Correct Answer: B, D
B, D

Explanation:

In Layer 2 switching, switches learn MAC addresses based on the source MAC address of incoming frames and forward frames based on the destination MAC address.

Step-by-Step Breakdown:

MAC Learning:

When a switch receives a frame, it records the source MAC address and 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 the destination MAC address and 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.
Question #37

Generated routes in a network are mainly used to:

  • A . Reduce the overall size of the routing table.
  • B . Manually configure specific network routes.
  • C . Automatically create a route when a specified condition is met.
  • D . Summarize external routes into the network.

Reveal Solution Hide Solution

Correct Answer: C
Question #38

Which BGP message type is used to establish peering sessions?

  • A . Update
  • B . Notification
  • C . Open
  • D . Keepalive

Reveal Solution Hide Solution

Correct Answer: C
Question #39

In Junos, which command is used to display the status of all interfaces?

  • A . show interfaces terse
  • B . show vlan brief
  • C . show interfaces descriptions
  • D . show ethernet-switching table

Reveal Solution Hide Solution

Correct Answer: A
Question #40

Which of the following are true regarding port modes in a VLAN setup? (Choose two)

  • A . An access port can carry traffic for multiple VLANs.
  • B . A trunk port can carry traffic for multiple VLANs.
  • C . An access port carries traffic only for a single VLAN.
  • D . A trunk port is used exclusively for inter-switch links.

Reveal Solution Hide Solution

Correct Answer: BC