Practice Free JN0-481 Exam Online Questions
A solution architect is designing a new 3-stage Clos fabric. A key consideration is determining the required number and capacity of the spine switches to ensure the fabric is non-blocking.
What is the fundamental principle used to calculate the required spine capacity?
- A . The aggregate uplink bandwidth from all leaf switches must be equal to or less than the aggregate downlink bandwidth of all spine switches.
- B . The total number of server ports in the fabric must equal the total number of spine ports.
- C . Each spine switch must have a dedicated high-speed link to every other spine switch.
- D . The number of spine switches must be exactly half the number of leaf switches.
An EVPN-VXLAN overlay is running on top of a BGP-based IP fabric underlay. A network engineer needs to verify the control plane for the overlay.
Which of the following statements accurately describe the relationship between the underlay and overlay control planes? (Choose 2.)
- A . The overlay control plane is responsible for building the routing tables that forward traffic between spines and leaves.
- B . The underlay and overlay must use the same BGP sessions and AS numbers.
- C . The underlay control plane’s primary role is to provide reachability for the VTEP loopback addresses.
- D . The overlay control plane uses BGP (typically IBGP) to distribute EVPN Network Layer Reachability Information (NLRI).
- E . The underlay control plane is responsible for advertising host MAC and IP addresses.
A data center architect is planning to expand an existing 3-stage Clos fabric to a 5-stage Clos fabric to support a significant increase in scale and connect multiple data center pods.
Which statement accurately describes the new roles of the switches in the 5-stage architecture?
- A . The original spine switches become the "core" switches, and new "aggregation" switches are added between the core and leaf layers.
- B . New "superspine" switches are added to interconnect multiple 3-stage "pods," and the original spine switches now act as the spine layer within each pod.
- C . The fabric is flattened, and all switches now connect to a central "megaspine" layer.
- D . The original leaf switches are replaced by new "superleaf" switches that connect directly to the original spines.
An architect is planning the spine capacity for a new data center fabric. The design includes 32 leaf switches. Each leaf switch has 4 x 100 GbE uplinks. The requirement is for a non-blocking fabric with a 3:1 oversubscription ratio from the server ports to the leaf uplinks.
To maintain a non-blocking architecture between the leaf and spine layers (a 1:1 ratio), what is the minimum number of spine switches required, and how many total ports must each spine have?
- A . 8 spine switches, each with at least 16 ports of 100 GbE.
- B . 3 spine switches, each with at least 48 ports of 100 GbE.
- C . 2 spine switches, each with at least 64 ports of 100 GbE.
- D . 4 spine switches, each with at least 32 ports of 100 GbE.
An architect is planning the spine capacity for a new data center fabric. The design includes 32 leaf switches. Each leaf switch has 4 x 100 GbE uplinks. The requirement is for a non-blocking fabric with a 3:1 oversubscription ratio from the server ports to the leaf uplinks.
To maintain a non-blocking architecture between the leaf and spine layers (a 1:1 ratio), what is the minimum number of spine switches required, and how many total ports must each spine have?
- A . 8 spine switches, each with at least 16 ports of 100 GbE.
- B . 3 spine switches, each with at least 48 ports of 100 GbE.
- C . 2 spine switches, each with at least 64 ports of 100 GbE.
- D . 4 spine switches, each with at least 32 ports of 100 GbE.
A cloud architect has deployed a Juniper Apstra-managed data center. After several months of operation, the analytics dashboard shows a high number of "BGP Anomaly" events. The architect wants to understand Apstra’s role in this situation.
According to Juniper’s best practices for operating an Apstra environment, what is the primary function of Apstra’s Intent-Based Analytics (IBA)?
- A . To automatically re-configure BGP sessions with new parameters when an anomaly is detected.
- B . To replace the need for traditional monitoring tools like SNMP and Syslog.
- C . To provide a real-time, closed-loop validation of the fabric’s operational state against the original design intent.
- D . To generate predictive models of future network traffic patterns.
A network engineer is troubleshooting an EVPN fabric and observes that a leaf switch is not importing routes from a remote tenant VRF, even though the routes are present in the BGP table.
The engineer reviews the following configuration on the local leaf switch for Tenant-A.
user@local-leaf# show routing-instances TENANT-A
instance-type vrf;
route-distinguisher 192.168.0.1:10;
vrf-import [ POLICY-A ];
vrf-export [ POLICY-A ];
user@local-leaf# show policy-options policy-statement POLICY-A
term 1 from community COMM-A;
term 1 then accept;
user@local-leaf# show policy-options community COMM-A
members target:65001:100;
The remote leaf is exporting routes for the same tenant with a route target of `target:65001:200`.
What is the cause of the issue?
- A . The local leaf’s `vrf-import` policy does not match the route target being exported by the remote leaf.
- B . The `vrf-export` policy on the local leaf is preventing the routes from being installed.
- C . The BGP session between the leaf switches is down.
- D . The Route Distinguishers on the local and remote leaf switches do not match.
A disaster recovery plan requires active-active Layer 2 adjacency between two data centers. The design uses EVPN multihoming on the border leaf switches to connect to the DCI links. An outage on one of the DCI links to a border leaf in the primary data center occurs.
What mechanism ensures that traffic from the remote data center is immediately redirected to the remaining active border leaf switch in the primary data center? (Choose 2.)
- A . The border leaf with the failed link withdraws its Type 1 Ethernet A-D per EVI route.
- B . The border leaf with the failed link advertises a Type 3 route with a higher sequence number.
- C . The remaining border leaf withdraws the Type 4 route for the failed link.
- D . The remote data center’s VTEPs update their next-hop information for the affected MAC/IP addresses based on new Type 2 advertisements.
- E . The Ethernet Segment Identifier (ESI) is used by the remote VTEPs to recognize the multihomed segment and redirect traffic.
An architect is deciding between a Centrally-Routed Bridging (CRB) and an Edge-Routed Bridging (ERB) design for a new EVPN-VXLAN fabric. The primary requirement is to minimize traffic "tromboning" (inefficient hair-pinning of traffic) for inter-VLAN communication.
Which design should the architect choose and why?
- A . ERB, because inter-VLAN routing for hosts on the same leaf switch occurs locally on that switch.
- B . CRB, because spine switches have higher performance and can handle the routing more efficiently.
- C . CRB, because centralizing the gateway simplifies routing policy management.
- D . ERB, because it requires fewer EVPN route types and simplifies the control plane.
A solution architect is designing a new data center fabric using Apstra. The architect has already defined the logical devices, rack types, and overall topology in a Template.
What is the primary purpose of a Template in the Apstra design workflow?
- A . To define the specific hardware model and operating system version for each switch.
- B . To store the live, operational state and telemetry for a running data center.
- C . To serve as a reusable, logical blueprint for the entire data center fabric’s topology and key policies.
- D . To define the physical port-to-port cabling map for the data center technicians.