PASS-SURE JN0-281 PDF CRAM EXAM–FIND SHORTCUT TO PASS JN0-281 EXAM

Pass-Sure JN0-281 PDF Cram Exam–Find Shortcut to Pass JN0-281 Exam

Pass-Sure JN0-281 PDF Cram Exam–Find Shortcut to Pass JN0-281 Exam

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q192-Q197):

NEW QUESTION # 192
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 ingress interface.
  • C. It will flood it out of all interfaces, except for the next-hop interface.
  • D. It will flood it out of all interfaces, except for the directly connected VLAN.

Answer: B

Explanation:
A MAC address of FF-FF-FF-FF-FF-FF is the Ethernet broadcast 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 # 193
What is the primary difference between IBGP and EBGP?

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

Answer: C


NEW QUESTION # 194
Which statement is correct about per-flow load balancing?

  • A. Packets associated with the same flow are sent through different egress ports.
  • B. Packets associated with the same flow are sent through the same egress port.
  • C. The packets are guaranteed to arrive at their destination in the same order in which they were sent.
  • D. The packets are guaranteed to arrive at their destination in a different order in which they were sent.

Answer: B

Explanation:
Per-flow load balancing ensures that packets within the same flow are always forwarded over the same path, ensuring that packet order is preserved.
Step-by-Step Breakdown:
Flow Definition:
A flow is typically defined by a combination of packet attributes like source/destination IP, source/destination port, and protocol type. Packets that belong to the same flow are routed over the same path to avoid reordering.
Per-Flow Behavior:
In per-flow load balancing, the hashing algorithm ensures that all packets in a particular flow use the same egress port, maintaining order across the network.
Juniper Reference:
Load Balancing in Juniper: This method ensures that flows are balanced across multiple paths while preventing packet reordering within a single flow.


NEW QUESTION # 195
Exhibit:

R2 received an OSPF update from R1, and it received the same update from R3.
Referring to the exhibit, what will R2 do?

  • A. R2 ignores the update from R1.
  • B. R2 does nothing with R3's update.
  • C. R2 ignores the update from R3.
  • D. R2 acknowledges R3 and discards it.

Answer: C

Explanation:
In the exhibit, R2 receives the same OSPF update from both R1 and R3. OSPF has mechanisms to prevent unnecessary processing of duplicate LSAs (Link-State Advertisements).
Step-by-Step Breakdown:
OSPF LSA Processing:
OSPF uses LSAs to exchange link-state information between routers. When a router receives an LSA, it checks if it already has a copy of the LSA in its Link-State Database (LSDB).
Duplicate LSAs:
If R2 has already received and processed the update from R1, it will ignore the update from R3 because it already has the same LSA in its database. OSPF uses the concept of flooding, but it does not reprocess LSAs that it already knows about.
R2 Behavior:
R2 will keep the update from R1 (the first one it received) and will ignore the same LSA from R3, as it is already in the LSDB.
Juniper Reference:
OSPF LSA Processing: Junos adheres to OSPF standards, ensuring that duplicate LSAs are not processed multiple times to avoid unnecessary recalculations.


NEW QUESTION # 196
Which statement is correct about an IRB interface?

  • A. An IRB interface is a Layer 3 interface that can be used to route between VLANs.
  • B. An IRB interface switches traffic within the same VLAN.
  • C. An IRB interface is a physical Layer 3 interface that connects VLANs together.
  • D. An IRB interface trunks together VLANs on different switches.

Answer: A

Explanation:
An IRB (Integrated Routing and Bridging) interface provides routing functionality between VLANs at Layer 3, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
IRB Functionality:
The IRB interface enables routing between different VLANs by acting as a Layer 3 gateway. Traffic within the same VLAN is handled by Layer 2 switching, while traffic between VLANs is routed through the IRB interface.
Layer 3 Routing Between VLANs:
Each VLAN can be assigned an IP address on the IRB interface, which allows traffic to flow between VLANs based on Layer 3 IP routing.
Juniper Reference:
IRB Interface Configuration: Juniper supports IRB for inter-VLAN routing on devices like the EX and QFX series switches, facilitating Layer 3 communication in data centers.


NEW QUESTION # 197
......

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