Question 1

Examine the exhibit. What type of information is NOT included in the IMET route advertised by VTEP1? https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/NOKIA_4A0-D01/page_10_img_1.jpg

Accepted Answer

B

Explanation: An EVPN Inclusive Multicast Ethernet Tag (IMET) route, or Route Type 3, is advertised by a VTEP to signal its membership in a broadcast domain for handling Broadcast, Unknown Unicast, and Multicast (BUM) traffic. According to RFC 7432, this route advertisement includes the originating VTEP's IP address, the Route Distinguisher (RD) of the EVPN Instance (EVI), and a PMSI Tunnel Attribute that carries the VNI. Receiving VTEPs collect these individual IMET routes from all participating peers to dynamically build their own local flooding list for ingress replication. The advertised route itself contains only a single entry for this list (the originator's IP), not the complete flooding list.

Question 2

Based on the exhibit output, which of the following statements is TRUE? https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/NOKIA_4A0-D01/page_12_img_1.jpg

Accepted Answer

B

Explanation: The exhibit displays the output for a system security capture-filter. This feature is designed to select specific packets based on defined criteria (in this case, protocol icmp) and copy them to the Control Plane Module (CPM). Once copied to the CPM, the packets are placed in a buffer where they can be analyzed using a tcpdump-like utility, such as the SR OS tools dump system-pcap command. The Packets Captured counter, showing a value of 10, confirms that ICMP packets are actively being copied to the CPM for analysis.

Question 3

Which of the following statements about configuration checkpoints in Nokia SR Linux is FALSE?

Accepted Answer

A

Explanation: In Nokia SR Linux, checkpoint 0 is a reserved identifier that refers to the current running configuration datastore. It is not a historical, saved checkpoint file. Historical checkpoints, which are created automatically after each successful commit, are numbered sequentially starting from 1. Checkpoint 1 represents the oldest available checkpoint, not checkpoint 0. Therefore, the statement that checkpoint 0 is always the oldest checkpoint is false.

Question 4

Which of the following is NOT one of the reasons why BGP is used as the routing protocol in the data center?

Accepted Answer

B

Explanation: The statement that BGP neighbors automatically discover each other is factually incorrect. BGP is a path-vector protocol that requires neighbors (peers) to be manually and explicitly configured with each other's IP addresses and autonomous system numbers. Unlike link-state protocols such as OSPF or IS-IS, which use multicast Hello packets on a shared link to dynamically discover neighbors, BGP has no such native mechanism. Since automatic neighbor discovery is not a feature of BGP, it cannot be a reason for its use in the data center. The other options listed are all well-established reasons for BGP's adoption in modern data center fabrics.

Question 5

Which of the following is NOT one of the user types supported in Nokia SR Linux?

Accepted Answer

D

Explanation: Nokia SR Linux defines user types based on their management and access domain within the system's architecture. It officially distinguishes between "SR Linux users," who are managed by the Network Operating System (NOS) for access to the CLI and gNMI, and "Regular Linux OS users," who are managed by the underlying Linux kernel for shell access. The system also supports containerized applications, which have their own user contexts ("Container users"). "Remote users" is not a distinct user type; rather, it describes a connection method (e.g., via SSH) that can be used by any of the supported user types.

Question 6

When autoboot flag is set in grub.cfg, which of the following is NOT performed as part of the Zero Touch Provisioning (ZTP) autoboot process?

Accepted Answer

D

Explanation: The Zero Touch Provisioning (ZTP) process on a Nokia SR Linux node is a device-centric mechanism initiated at boot time. It fundamentally relies on DHCP to acquire network connectivity and the location of a provisioning script. The device then downloads this script, along with any necessary software packages (RPMs) or images, from a web or FTP server and executes it to complete its configuration. Nokia’s Fabric Services System (FSS) is a higher-level orchestration and automation platform for data center fabrics. While FSS utilizes ZTP to onboard new switches into the fabric, the ZTP process itself is independent of FSS. The deployment of a digital sandbox is a function managed by FSS, not a direct action performed by the device's native ZTP autoboot process.

Question 7

Examine the exhibit. Which of the following statements is TRUE? https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/NOKIA_4A0-D01/page_7_img_1.jpg

Accepted Answer

C

Explanation: The “nhgrp” keyword shown in the route entry indicates that the static route does not carry a single next-hop but is bound to a next-hop group object. A next-hop group can only be referenced in the routing table when it contains two or more next-hops; otherwise the router would reference the single address directly and the keyword “nhgrp” would not appear. Therefore the presence of “nhgrp” guarantees that at least two next-hops have been configured for this static route, making option C the only true statement.

Question 8

Which of the following statements about the MAC table shown in the exhibit output is FALSE? https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/NOKIA_4A0-D01/page_6_img_1.jpg

Accepted Answer

A

Explanation: The displayed record is produced by the SR OS command “show mac-duplication”. It shows that MAC 00:25:BA:00:00:10 triggered a “re-learning” event –- i.e., the same interface repeatedly re-learnt the MAC faster than the configured rate threshold. When a duplicate is learnt on different interfaces the state would be “duplicate” and the interface list would contain more than one entry. Because the output indicates a re-learning event (single interface), the statement claiming that the MAC is learnt on more than one interface is false. The remaining statements accurately describe what can be read in the output: the re-learning threshold was exceeded, port ethernet-1/10 owns the MAC, and mac-duplication detection is enabled for mac-vrf-1.

Question 9

Which of the following statements about IP-VRFs in Nokia’s SR Linux is FALSE?

Accepted Answer

D

Explanation: An IP-VRF is a purely Layer 3 construct, equivalent to a virtual router. It contains an independent routing table and a set of Layer 3 interfaces. A subnet, where multiple servers can communicate directly, is a Layer 2 broadcast domain. While this Layer 2 domain is linked to an IP-VRF via a Layer 3 interface (such as an Integrated Routing and Bridging - IRB - interface) which acts as the default gateway, the servers themselves are not connected within the Layer 3 IP-VRF. They are connected to a Layer 2 network (like a mac-vrf or VLAN) that is merely associated with the IP-VRF. Therefore, the statement is technically false.

Question 10

Which of the following statements about resilient ECMP load balancing is TRUE?

Accepted Answer

D

Explanation: Resilient ECMP is an enhancement to standard Equal-Cost Multi-Path (ECMP) designed to minimize service disruption when a next-hop path fails or is restored. In traditional ECMP, a change in the number of available paths (e.g., from N to N-1) forces a recalculation of the hash algorithm for all flows, potentially re-routing traffic that was on stable paths. Resilient ECMP avoids this by using a more stable mapping mechanism. When a next-hop fails, only the traffic flows that were actively using that specific failed path are re-distributed among the remaining active next-hops. Flows on other, unaffected paths are not impacted, thus preserving their state and preventing unnecessary disruption.

Free Nokia 4A0-D01 Actual Exam Questions