Which three technologies improve high availability and convergence in a data center network? (Choose three.)
Correct Answer:ABE
High availability and fast convergence are critical in data center networks to minimize downtime and maintain optimal performance. The following technologies contribute to achieving these goals:
Graceful Restart (GR): GR allows routers to maintain forwarding state during control plane restarts, ensuring continuous packet forwarding while minimizing network disruptions.
Bidirectional Forwarding Detection (BFD): BFD provides fast detection of path failures, allowing routing protocols to converge quickly by detecting link failures much faster than traditional timers. Link Aggregation Group (LAG): LAG increases both redundancy and bandwidth by combining multiple physical links into one logical link, providing load balancing and fault tolerance.
Juniper Reference: High Availability Techniques: These technologies are fundamental in ensuring rapid recovery and failover within Juniper-based data center environments.
Which two statements describe an IP fabric? (Choose two.)
Correct Answer:CD
AnIP fabricis a network topology designed to provide a scalable, low-latency architecture that is typically implemented in modern data centers. It usesspine and leafswitches and enables efficienttraffic load sharingacross the network.
Step-by-Step Breakdown:
Spine-Leaf Architecture:
Leaf Devices: These switches connect to servers and edge devices within the data center. Each leaf switch connects to every spine switch.
Spine Devices: These high-performance switches interconnect all the leaf switches. There are no direct connections between leaf switches or spine switches. This architecture ensures that any two endpoints within the fabric are only one hop away from each other, minimizing latency.
Traffic Load Sharing:
An IP fabric leveragesEqual-Cost Multipath (ECMP)to distribute traffic evenly across all available paths between leaf and spine switches, providing effective load balancing. This ensures that no single link becomes a bottleneck and that traffic is distributed efficiently across the network.
Juniper Reference:
Juniper providesQFX Seriesswitches optimized for IP fabric topologies, allowing for scalable deployments in modern data centers.
EVPN-VXLAN: Often used in IP fabrics to extend Layer 2 services across the fabric with Layer 3 underlay, enabling both efficient routing and bridging.
Which route is preferred by the Junos OS software routing tables?
Correct Answer:C
In Junos OS,direct routesare the most preferred routes in the routing table, having the highest priority.
Step-by-Step Breakdown:
Direct Routes:
Direct routes represent networks that are directly connected to the router's interfaces. Since these routes are directly accessible, they are assigned the highest priority and always take precedence over other types of routes.
Preference Values:
Direct routes have apreference of 0, which is the most preferred in Junos. Static routes, OSPF routes, and BGP routes have higher preference values and will only be used if there are no direct routes to the destination.
Juniper Reference:
Direct Route Preference: In Junos,direct routesare always preferred over other routes, ensuring that the router forwards traffic through locally connected networks.
What are three correct layer names used in legacy hierarchical network design? (Choose three.)
Correct Answer:ACD
Inlegacy hierarchical network design, three key layers are used to create a scalable and structured network:
Step-by-Step Breakdown: 
Access Layer: The access layer is where end devices, such as computers and IP phones, connect to the network.
It typically involves switches that provide connectivity for devices at the edge of the network. Aggregation Layer (Distribution Layer):
The aggregation layer (also called the distribution layer) aggregates traffic from multiple access layer devices and applies policies such as filtering and QoS. It also provides redundancy and load balancing. Core Layer: The core layer provides high-speed connectivity between aggregation layer devices and facilitates traffic within the data center or between different network segments.
Juniper Reference: Legacy Hierarchical Design: Juniper networks often follow the traditional three-layer design (Access, Aggregation, and Core) to ensure scalability and high performance.
Which operation mode command will display the mapping between the VLAN ID and ports on a switch?
Correct Answer:D
To display themapping between VLAN IDs and portson a Juniper switch, the show vlans command is used.
Step-by-Step Breakdown: VLAN Information:The show vlans command displays detailed information about VLAN configurations, including the VLAN ID, associated interfaces (ports), and VLAN membership. Command Example: show vlans This command will provide an output listing each VLAN, its ID, and the interfacesassociated with the VLAN, enabling network engineers to quickly verify VLAN to port mappings.
Juniper Reference: VLAN Verification: Use the show vlans command to verify which VLANs are configured on the switch and the ports that are members of those VLANs.