Free and Premium Nokia 4A0-D01 Dumps Questions Answers

The "baseline diff" command is used to compare the candidate configuration against the baseline datastore to see changes or conflicts, especially when multiple users are involved or to verify differences. It does not indicate that the user is unable to commit changes.

Comprehensive and Detailed Explanation From Exact Extract:

Option A: TRUE – "duplicate" status confirms multiple interfaces.

"A 'duplicate' entry indicates the MAC was detected on multiple ports."

— SR Linux Bridge Table Guide, "Duplicate MAC Handling"

Option B: FALSE – No re-learning rate data is present. The output shows a static duplicate entry, not rate violations.

"MAC re-learning rate thresholds generate specific alerts (not shown here). This exhibit only shows a persistent duplicate state."

— SR Linux Monitoring Guide, "MAC Mobility Events"

Option C: TRUE – The MAC is explicitly bound to ethernet-1/10.0.

"The 'Destination' column specifies the interface where the MAC was last observed."

— SR Linux CLI Reference, "show bridge-table"

Option D: TRUE – Duplicate detection is active since duplicates are flagged.

"The presence of 'duplicate' entries confirms MAC duplication detection is enabled."

— SR Linux Security Guide, "MAC Duplication"

Conclusion: Option B is unsupported by the exhibit.

Comprehensive and Detailed Explanation From Exact Extract:

Option A: TRUE – Only one management interface (mgmt0) exists.

"The system supports a single management interface (mgmt0) for out-of-band access."

— SR Linux Interface Guide, "Management Port"

Option B: TRUE – Network interfaces bind to hardware ports.

"Network interfaces (e.g., ethernet-1/1) map directly to physical line card ports."

— SR Linux Interface Guide, "Port Mapping"

Option C: FALSE – Loopback interfaces are virtual, not physical.

"Loopback interfaces (e.g., lo0) are logical entities with no physical hardware association."

— SR Linux Routing Guide, "Loopback Interfaces"

Option D: TRUE – L2 parameters (e.g., MTU) are set at the main interface; L3 (e.g., IP) at subinterfaces.

"Layer 2 attributes (MTU, admin-state) are configured under the main interface. Layer 3 settings (IP, VRF) are applied to subinterfaces."

— SR Linux Interface Guide, "Subinterface Configuration"

Comprehensive and Detailed Explanation with Exact Extracts:

Option A (TRUE): Type 1 routes enable multi-homing functions.

Extract from Nokia EVPN Multi-Homing Guide:

"Type 1 Ethernet A-D routes signal reachability for an Ethernet Segment (ES) and enable fast convergence/aliasing in multi-homing."

Option B (TRUE): Type 4 routes facilitate DF election.

Extract from Nokia EVPN Fundamentals Guide:

"Type 4 Ethernet Segment routes advertise ESI and VTEP IP to peers for Designated Forwarder (DF) election, which prevents BUM traffic loops."

Option C (FALSE): The ESI is globally unique, not locally significant.

Extract from Nokia SR Linux Configuration Guide (Section: EVPN ESI):

"The ESI must be unique network-wide and consistently configured on all leafs attached to the same multi-homed device. It is not locally significant."

Option D (TRUE): An ES defines the host connectivity model.

Extract from Nokia EVPN Multi-Homing Guide:

"An Ethernet Segment (ES) is a set of links connecting a single host (e.g., server) to one or more leafs for redundancy/load balancing."

Comprehensive and Detailed Explanation with Exact Extracts:

Options A, B, and C are part of ZTP autoboot:

A: DHCP assigns IP/gateway.

B/C: Scripts download images/RPMs from servers (HTTP/FTP).

Extract from Nokia SR Linux ZTP Guide:

"Autoboot triggers DHCP discovery for IP/gateway. The device then fetches a provisioning script (via DHCP/DNS) that downloads RPMs/images from HTTP/FTP servers."

Option D is NOT part of ZTP autoboot:

Fabric Services System (FSS) and its digital sandbox are separate tools for lifecycle management. ZTP does not auto-deploy them.

Extract from Nokia FSS Deployment Guide:

"FSS deployment requires manual setup or orchestration tools. The digital sandbox is not automatically deployed via ZTP autoboot."

Comprehensive and Detailed Explanation with Exact Extracts:

Options A, B, and C ARE configured in static-routes:

Blackhole: Configured under static-routes for a prefix to drop traffic.

IPv4 destination prefix: Defined directly in the static-routes container.

Preference value: Set per static route entry within static-routes.

Extract from Nokia SR Linux Configuration Guide (Section: Static Routes):

"Static routes are configured under /routing-policy/static-routes. Each entry requires a prefix (e.g., 0.0.0.0/0). The blackhole parameter and preference value are configured directly within this container for a specific prefix."

Option D (Next-hop group) CANNOT be configured in static-routes:

Next-hop groups are separate objects defined under /routing-policy/next-hop-groups.

The static-routes container references a next-hop group by name but does not define its properties.

Extract from Nokia SR Linux Configuration Guide (Section: Next-Hop Groups):

"Next-hop groups are configured under /routing-policy/next-hop-groups. Each group is given a name and defines properties like next-hop IPs, blackhole behavior, or indirect settings. Static routes reference a next-hop group via the next-hop-group parameter under /routing-policy/static-routes but do not configure the group itself here."

Comprehensive and Detailed Explanation From Exact Extract:

Option A: TRUE – IP addresses are assigned to IRB subinterfaces.

"The IRB subinterface configuration includes the IP address for integrated routing."

— SR Linux EVPN Guide, "IRB Configuration"

Option B: TRUE – IRB subinterfaces reside in IP-VRF instances.

"IRB subinterfaces are associated with an IP-VRF network instance for L3 routing."

— SR Linux Network Instance Guide, "IP-VRF Setup"

Option C: FALSE – One IRB subinterface serves an entire MAC-VRF (L2 domain), not per interface.

"A single IRB subinterface provides L3 gateway services for all interfaces in a MAC-VRF instance."

— SR Linux EVPN Guide, "Asymmetric IRB Design"

Option D: TRUE – Each MAC-VRF uses one IRB subinterface.

"Each MAC-VRF network instance requires exactly one IRB subinterface for inter-subnet routing."

— SR Linux Network Instance Guide, "MAC-VRF Integration"

Comprehensive and Detailed Explanation with Exact Extracts:

Option A & B are FALSE: While recursive lookups are required for both next-hops (10.1.1.0 and 10.2.1.0), there is no dependency between them. Each next-hop must be resolved independently via a separate recursive lookup in the routing table. Neither next-hop is resolved "using" the other.

Extract from Nokia SR Linux Configuration Guide (Section: Static Routes):

"An indirect next-hop is not directly connected. The system must perform a recursive lookup in the routing table to find a route that matches the indirect next-hop IP address and resolve it to a directly attached next-hop and egress interface. Each indirect next-hop in a route is resolved independently."

Extract from Nokia SR Linux Fundamentals Guide (Section: Route Resolution):

"Routes with indirect next-hops require recursive route lookup. The router searches its routing table for a path to the indirect next-hop IP address itself. Multiple indirect next-hops in a single route entry are resolved in parallel, not sequentially."

Option C is TRUE: The exhibit shows a single static route (192.168.20.0/30) with two indirect next-hops (10.1.1.0 and 10.2.1.0). This configuration defines a next-hop group with two members for this route, enabling Equal-Cost Multi-Path (ECMP) load balancing or redundancy.

Extract from Nokia SR Linux Configuration Guide (Section: Static Routes):

"Multiple next-hop addresses can be specified for a static route. This creates a next-hop group. Traffic matching the route prefix is load-balanced across all active next-hops in the group using ECMP."

Extract from Nokia SR Linux Fundamentals Guide (Section: Static Routing):

"A static route entry listing multiple next-hops implies a next-hop group. The number of next-hops listed in the show route-table output for a single route ID directly indicates the number of next-hops configured in the group."

Option D is FALSE: The preference value (Pref) is configured per route, not per next-hop within the route. Both next-hops (10.1.1.0 and 10.2.1.0) share the same preference value (5), as they belong to the same route entry (ID 0). Next-hop selection within the group is based on the ECMP hashing algorithm, not preference. Preference is used to choose between different routes (from different protocols) to the same prefix.

Extract from Nokia SR Linux Configuration Guide (Section: Static Routes):

"The preference value is a property of the static route itself, not individual next-hops within it. All next-hops in a static route's next-hop group inherit the same preference value."

Extract from Nokia SR Linux Fundamentals Guide (Section: Route Selection):

"When multiple next-hops exist for a route (ECMP), the active next-hop for a specific flow is determined by a hash of packet header fields (e.g., 5-tuple). Preference values are only compared when selecting between different routes (e.g., static vs. BGP) to the same prefix."

Comprehensive and Detailed Explanation with Exact Extracts:

Options A, B, and C are Day 2+ operations:

A: Telemetry enables real-time monitoring.

B: Health analysis supports proactive maintenance.

C: Sandbox validates changes pre-deployment.

Extract from Nokia FSS Day 2 Operations Guide:

"Day 2+ includes telemetry-based monitoring, health analytics, and sandbox testing for upgrades/changes."

Option D is a Day 0 activity:

Fabric intents define initial design templates (Day 0), not ongoing operations.

Extract from Nokia FSS Lifecycle Management Guide:

"Fabric intents are used during Day 0 design to build templates. Day 2+ focuses on operational tasks like monitoring (A), health checks (B), and sandbox validation (C)."

Comprehensive and Detailed Explanation From Exact Extract:

In a leaf-spine Clos network:

Option A is TRUE: Each leaf connects to every spine for full redundancy and non-blocking fabric.

"In a Clos topology, every leaf node connects to every spine node, ensuring any-to-any connectivity."

— Nokia Data Center Fabric Design Guide, "Leaf-Spine Architecture"

Option B is TRUE: East-west traffic flows predictably via spines.

"Leaf-spine provides deterministic paths for east-west traffic, minimizing latency and jitter."

— Nokia SR Linux EVPN Configuration Guide, "Traffic Flow in Clos Networks"

Option C is FALSE: Clos networks do not use STP. They rely on Layer 3 ECMP and routing protocols for loop avoidance.

"Clos fabrics eliminate STP by design. Forwarding loops are avoided through ECMP and routing protocols (e.g., BGP), not Layer 2 STP."

— Nokia Data Center Fabric Best Practices, "Loop Avoidance"

Option D is TRUE: ECMP load-balances traffic across multiple spine paths.

"ECMP is fundamental to leaf-spine, distributing traffic across all available spine links."

— Nokia SR Linux Routing Guide, "ECMP in Clos Fabrics"