Question # 1
Which state in the adjacency process do OSPF routers check the MTU size? |
A. Init | B. Exchange | C. Done | D. ExStart |
B. Exchange
Explanation:
In OSPF, routers exchange link-state information in different stages to establish full adjacency. TheMTU sizeis checked during theExchangestate.
Step-by-Step Breakdown:
OSPF Adjacency Process:
OSPF routers go through multiple stages when forming an adjacency:Down,Init,2-Way,ExStart,Exchange,Loading, andFull.
Exchange State:
During theExchangestate, OSPF routers exchangeDatabase Description (DBD)packets to describe their link-state databases. TheMTU sizeis checked at this stage to ensure both routers can successfully exchange these packets without fragmentation.
If there is anMTU mismatch, the routers may fail to proceed past the Exchange state.
Juniper Reference:
MTU Checking in OSPF: Junos uses the Exchange state to check for MTU mismatches, ensuring that routers can properly exchange database information without packet fragmentation issues.
Question # 2
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 system] | C. [edit interfaces] | D. [edit chassis] |
D. [edit chassis]
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 supportLink 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
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.
Question # 3
Which two statements are correct about EVPN-VXLAN overlay networking? (Choose two.) |
A. It is the only option to provide reachability between servers that reside in the same network segment in a data center. | B. BGP provides the control plane within the overlay network. | C. OSPF provides the control plane within the overlay network. |
B. BGP provides the control plane within the overlay network.
C. OSPF provides the control plane within the overlay network.
Explanation:
EVPN-VXLANis an overlay technology used in data center networks to extend Layer 2 services over a Layer 3 network.
Step-by-Step Breakdown:
BGP Control Plane:BGP (Border Gateway Protocol)is used as the control plane for EVPN-VXLAN. BGP advertises MAC addresses and IP address reachability information across the VXLAN network, enabling efficient multi-tenant Layer 2 connectivity over a Layer 3 infrastructure.
Encapsulation:VXLAN (Virtual Extensible LAN)encapsulates Layer 2 frames into Layer 3 packets. This encapsulation allows Layer 2 traffic to be transported across a Layer 3 network, effectively creating a tunnel for Ethernet frames.
Juniper Reference:
EVPN-VXLAN Configuration: Juniper supports EVPN-VXLAN with BGP as the control plane, allowing scalable Layer 2 connectivity over a routed infrastructure in modern data centers.
Question # 4
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. |
B. Reject all routes.
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.
Question # 5
What are two requirements for an IP fabric? (Choose two.) |
A. a Layer 3 routing protocol | B. a single connection between each spine and leaf | C. a single connection between each leaf | D. a Layer 2 switching protocol |
A. a Layer 3 routing protocol
B. a single connection between each spine and leaf
Explanation:
AnIP fabricis a network architecture commonly used in data centers to provide scalable, high-throughput connectivity using aspine-leaf topology.
Step-by-Step Breakdown:
Layer 3 Routing Protocol:An IP fabric relies on aLayer 3 routing protocol, typically BGP or OSPF, to provide routing between the leaf and spine switches. This ensures efficient traffic forwarding across the network.
Single Connection Between Spine and Leaf:In an IP fabric, each leaf switch connects toevery spine switchwith a single connection. This ensures that traffic between any two leaf switches can travel through the spine layer in just two hops.
Juniper Reference:
Spine-Leaf Design: Juniper’s IP fabric implementations are designed for scalability and low-latency routing, often using protocols like BGP for Layer 3 control.
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Data Center, Associate (JNCIA-DC) Exam Dumps
Exam Code: JN0-280
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