Practice Free JN0-481 Exam Online Questions
An architect is planning a DCI solution connecting two data centers, DC1 and DC2, using an EVPN-VXLAN overlay. A key requirement is to prevent Layer 2 storms and MAC address table flooding from propagating between the sites.
Which features or design principles must be implemented to meet this requirement? (Select all that apply.)
- A . Enable MAC pinning on the border leaf switches.
- B . Implement storm control on the DCI-facing interfaces of the border leaf switches.
- C . Use separate Route Distinguishers for the same VLAN/VNI in each data center.
- D . Implement MAC filtering to explicitly deny broadcast MAC addresses on the DCI links.
- E . Disable ARP suppression on the border leaf VTEPs.
- F . Utilize designated forwarder (DF) election for multihomed segments to prevent loops.
An engineer is preparing to make a significant change to a production fabric managed by Apstra, such as adding a new rack. Before committing the change, the engineer wants to see the exact CLI commands that Apstra will push to the affected devices.
In which section of the Apstra Blueprint UI can the engineer review this "pre-flight" configuration?
- A . In the Active tab, by selecting a device and viewing its running configuration.
- B . In the Uncommitted tab, by selecting a device and viewing its incremental or rendered configuration.
- C . In the Time Voyager tab, by comparing the last two committed versions.
- D . In the Analytics tab, by creating a new probe to monitor configuration changes.
An automation engineer is using Apstra to manage a multi-vendor data center. The engineer has created a single, generic template for a 3-stage Clos fabric. The engineer wants to deploy this same template in two different environments: one using Juniper QFX switches and another using Arista switches.
What Apstra components make it possible to use the same generic template for different hardware vendors? (Choose 2.)
- A . Interface Maps
- B . Property Sets
- C . Configlets
- D . Logical Devices
- E . Device Profiles
A data center architect is deploying an EVPN-VXLAN fabric and must decide on the control plane model for handling BUM (Broadcast, Unknown Unicast, and Multicast) traffic. The two options being considered are BGP-based EVPN control plane and multicast-based control plane.
What is a primary advantage of using the BGP EVPN control plane with ingress replication over a traditional multicast-based approach for handling BUM traffic?
- A . It uses less bandwidth on the fabric links by sending only a single copy of each BUM packet.
- B . It reduces the amount of BGP routing information that needs to be exchanged.
- C . It eliminates the need for any IP multicast configuration (like PIM) in the underlay network.
- D . It provides superior performance for high-bandwidth multicast applications like video streaming.
A solution architect is designing a new data center using Apstra and wants to follow Juniper’s reference architecture. The architect plans to use a 3-stage Clos fabric with dedicated border leaf switches.
What is the primary role of the border leaf switches in this reference design?
- A . To provide Layer 2 and Layer 3 connectivity from the data center fabric to external networks, such as the campus or the internet.
- B . To host centralized services like firewalls and load balancers.
- C . To connect servers and other end-hosts to the fabric.
- D . To provide high-speed connectivity between the spine switches.
A security administrator is reviewing an EVPN-VXLAN fabric and is concerned about traffic visibility between tenants. The fabric uses a standard spine-leaf architecture with an Edge-Routed Bridging (ERB) overlay. Each tenant is placed in a separate VRF.
A server in Tenant A’s web VLAN needs to communicate with a server in Tenant A’s database VLAN. Both servers are connected to the same leaf switch.
Where does the Layer 3 routing for this traffic occur, and which EVPN route types are primarily involved for this specific communication flow?
- A . Routing occurs on the spine switch; it requires EVPN Type 5 routes.
- B . Routing occurs on the leaf switch’s IRB interface; no EVPN routes are needed for this local communication.
- C . Routing occurs on a centralized gateway router; it requires EVPN Type 3 routes.
- D . Routing occurs on the leaf switch’s IRB interface; it primarily requires EVPN Type 2 routes to learn the host IPs.
Type 5 (IP Prefix Route)
Functions:
A) Used to establish paths for forwarding BUM (Broadcast, Unknown Unicast, Multicast) traffic.
B) Advertises the MAC address (and optionally IP address) of an end host.
C) Advertises an IP prefix for inter-subnet forwarding between VTEPs.
D) Used for auto-discovery of remote VTEPs in the same EVI and for mass MAC withdrawal.
- A . 1-C, 2-A, 3-D, 4-B
- B . 1-C, 2-A, 3-B, 4-D
- C . 1-B, 2-D, 3-A, 4-C
- D . 1-D, 2-B, 3-C, 4-A
A solution architect is presenting the Juniper Apstra architecture to a customer. The architect needs to explain the function of the main components.
What is the primary role of the Apstra server in the architecture?
- A . To directly forward data plane traffic between spine and leaf switches.
- B . To act as a BGP route reflector for the EVPN overlay control plane.
- C . To execute routing protocol processes on behalf of the physical switches.
- D . To serve as the central repository of intent, configuration, and telemetry, and to host the management UI.
A network engineer is configuring a new EVPN-VXLAN fabric. The underlay is established using EBGP, and all VTEPs have IP reachability to each other’s loopback addresses. The overlay will also use BGP to exchange EVPN routes.
How should the overlay BGP sessions be configured between the leaf VTEPs?
- A . Establish IBGP peering sessions from each leaf VTEP to the spine switches, which are configured as route reflectors.
- B . Establish EBGP peering sessions directly between all leaf VTEPs in a full mesh.
- C . Establish an EBGP peering session from each leaf VTEP to its connected spine switches.
- D . Establish IBGP peering sessions directly between all leaf VTEPs in a full mesh.
An Automation Engineer needs to onboard a new leaf switch into an Apstra-managed fabric. The switch has been physically racked and cabled, and it is powered on. The switch has a factory-default configuration but is reachable on the management network via an IP address assigned by a DHCP server.
What is the role of the Apstra device agent in the onboarding process?
- A . The agent’s primary role is to configure the BGP underlay on the switch, after which it is no longer needed.
- B . The agent runs on the Apstra server and uses SNMP to communicate with the switch.
- C . Apstra pushes the agent to the switch, and the agent then acts as the intermediary for all configuration and telemetry operations between the switch and the Apstra server.
- D . The agent must be manually installed on the switch from the Junos OS CLI before Apstra can discover it.