350-501 Automation and Assurance Practice Test 2 — 15 Questions

Question 1

Drag and drop the steps to configure a static route on a Cisco IOS router into the correct order.

Accepted Answer

1. Enter global configuration mode (configure terminal)
2. Configure the static route using the ip route command with destination network, subnet mask, and next-hop address or exit interface
3. Verify the configuration (e.g., show ip route)
4. Exit configuration mode (end or exit). Static routes require global config mode and must specify the destination network, subnet mask, and next-hop address or exit interface.

Answer

1. Enter global configuration mode (configure terminal)
2. Verify the configuration (e.g., show ip route)
3. Configure the static route using the ip route command
4. Exit configuration mode (end or exit)

Answer

1. Configure the static route using the ip route command
2. Enter global configuration mode (configure terminal)
3. Verify the configuration (e.g., show ip route)
4. Exit configuration mode (end or exit)

Answer

1. Exit configuration mode (end or exit)
2. Enter global configuration mode (configure terminal)
3. Configure the static route using the ip route command
4. Verify the configuration (e.g., show ip route)

Question 2

Match each multicast protocol to its role.

Accepted Answer

IGMP: Manages multicast group membership between hosts and local routers. These are essential multicast protocols for service provider IPTV and content delivery.

Answer

IGMP: Builds distribution trees for efficient multicast forwarding

Answer

PIM-SM: Shares active source information between different domains

Question 3

A network engineer needs to automate configuration of multiple Cisco routers and wants to use a protocol that supports both datastore operations and selective retrieval of configuration. Which protocol should be used?

Accepted Answer

NETCONF. NETCONF (RFC 6241) is the correct choice because it is designed specifically for network configuration management, supporting full datastore operations (e.g., , , ) and selective retrieval of configuration data using subtree or XPath filtering. This aligns directly with the engineer's requirement for both datastore operations and selective retrieval.

Answer

SNMPv3

Answer

gRPC

Answer

OpenFlow

Answer

RESTCONF

Question 4

An SP customer reports intermittent voice quality issues. The engineer wants to measure jitter and packet loss between two remote sites using Cisco IP SLA. Which IP SLA operation type should be configured?

Accepted Answer

UDP Jitter. The UDP Jitter operation (option E) is correct because it measures both one-way jitter and packet loss by sending UDP packets with precise timestamps, which is essential for diagnosing voice quality issues. Unlike other IP SLA operations, UDP Jitter specifically tracks inter-packet delay variation (jitter) and loss patterns that directly impact VoIP and real-time traffic.

Answer

DNS Query

Answer

ICMP Echo

Answer

HTTP Get

Answer

TCP Connect

Question 5

A service provider wants to stream interface counters from a Cisco router to a collector using model-driven telemetry. The collector is behind NAT and cannot be reached from the router. Which telemetry model should be used?

Accepted Answer

Dial-out. Dial-out telemetry is the correct model because it allows the router to initiate a TCP connection to the collector, even when the collector is behind NAT and cannot be reached from the router. In dial-out mode, the router acts as the client and pushes telemetry data to the collector's configured IP address and port, bypassing the need for the collector to initiate the connection. This contrasts with dial-in models where the collector must reach the router, which is impossible when the collector is behind NAT.

Answer

SNMP traps

Answer

gNMI

Answer

NETCONF

Answer

Dial-in

Question 6

An engineer is using RESTCONF to configure an interface on a Cisco IOS-XE device. The request returns a 400 Bad Request error. What is the most likely cause?

Accepted Answer

The JSON payload contains incorrect data types or missing mandatory leafs. A 400 Bad Request in RESTCONF indicates a client-side error, typically malformed syntax. The most common cause is an invalid JSON payload, such as incorrect data types (e.g., string instead of integer) or missing mandatory leafs defined in the YANG module. RESTCONF validates the payload against the YANG schema before applying the configuration, and any schema violation triggers a 400 error.

Answer

The device does not support RESTCONF

Answer

The user does not have sufficient privileges

Answer

The URI is incorrect

Answer

The YANG module is not loaded

Question 7

A team uses Ansible to automate configuration of Cisco devices. They want to ensure that configurations are applied only if the device is reachable and the current configuration differs from the intended. Which Ansible module or feature is best suited for this?

Accepted Answer

ios_config with check_mode. The `ios_config` module with `check_mode` (enabled via the `--check` flag or `check_mode: yes`) allows Ansible to first verify device reachability and then compare the intended configuration against the running configuration without making changes. Only when a difference is detected and `check_mode` is disabled will the module apply the configuration changes. This directly meets the requirement of applying configurations only when the device is reachable and the current configuration differs from the intended.

Answer

ios_system

Answer

net_get

Answer

ios_command

Answer

ios_facts

Question 8

An engineer configures model-driven telemetry on a Cisco XR router to send data to a collector. After configuring, the collector receives no data. The engineer verifies that the collector IP and port are reachable. What is the next step to troubleshoot?

Accepted Answer

Check that the sensor-group and destination-group are correctly associated and committed in the subscription. In model-driven telemetry on Cisco XR, a subscription must explicitly associate a sensor-group (which defines the data to collect) with a destination-group (which defines where to send it). If these are not correctly associated and committed, the router will not stream any telemetry data to the collector, even if the collector is reachable. The verification of reachability confirms the network path is fine, so the next logical step is to check the subscription configuration.

Answer

Check if the YANG model is valid

Answer

Verify that the router has a route to the collector

Answer

Reboot the router

Answer

Check the SNMP community strings

Question 9

A large SP plans to deploy SR-TE tunnels across the backbone using an SDN controller for path computation. To ensure fast convergence and scalability, which automation approach should be used for tunnel creation?

Accepted Answer

PCEP with stateful delegation to controller. B is correct because PCEP with stateful delegation allows the SDN controller to compute and instantiate SR-TE tunnels dynamically, while the router delegates control to the controller for path updates. This approach ensures fast convergence by enabling the controller to react to network changes in real time and scales efficiently by centralizing path computation, avoiding per-router configuration overhead.

Answer

Static configuration on each router

Answer

RSVP-TE tunnels

Answer

NetFlow-based path selection

Answer

SNMP traps

Question 10

A Cisco XR router is configured to stream telemetry via gRPC with TLS. The collector can connect but receives empty data. The telemetry configuration is as follows: sensor-group with 'openconfig-interfaces' paths. What is the likely cause?

Accepted Answer

The sensor-group path is not supported by the device. The collector can establish a gRPC-TLS connection but receives empty data because the sensor-group path 'openconfig-interfaces' is not supported on the Cisco XR router. Cisco IOS XR supports OpenConfig paths only if the corresponding YANG models are loaded and the device implements those models; if the path is unsupported, the router will accept the subscription but send no telemetry data for that path. This is a common misconfiguration when using gRPC telemetry with OpenConfig models on platforms that may not fully support all OpenConfig paths.

Answer

The router's CPU is overloaded

Answer

The collector does not support TLS

Answer

The telemetry interval is too short

Answer

The destination group is missing the 'encoding' configuration

Question 11

When automating configuration changes across a large network using a tool like Cisco NSO, what is the best practice to minimize the risk of negative impact?

Accepted Answer

Use a staging environment with identical configuration to test before production. Using a staging environment with identical configuration to test before production is the best practice because it allows validation of automation scripts and configuration changes in a controlled setting that mirrors the production network. This approach identifies potential errors, compatibility issues, or unintended side effects without risking service disruption, aligning with Cisco NSO's recommended deployment workflow that emphasizes pre-production testing to ensure change reliability.

Answer

Rely on rollback automation

Answer

Limit automation to read-only commands

Answer

Automate only during maintenance windows

Answer

Apply changes directly to production devices

Question 12

Which TWO are benefits of model-driven telemetry over SNMP polling?

Accepted Answer

Supports structured data models (YANG). Model-driven telemetry uses structured data models defined in YANG, which provides a standardized, hierarchical representation of device state and configuration. This contrasts with SNMP polling, which relies on flat MIB variables and often requires complex parsing of unstructured data. YANG models enable consistent data retrieval across multivendor environments and simplify automation workflows.

Answer

Requires fewer credentials for access

Answer

Works with legacy devices without modification

Answer

Uses XML exclusively

Question 13

Which TWO are possible causes for a NETCONF session failing to establish with a Cisco IOS-XE device?

Accepted Answer

TCP port 830 is blocked by a firewall. NETCONF uses TCP port 830 as its default transport port (per RFC 6242). If a firewall blocks this port, the TCP three-way handshake cannot complete, preventing the NETCONF session from establishing. This is a common network-layer cause of session failure.

Answer

The device is running IOS-XR

Answer

The YANG module namespace is incorrect

Answer

NTP is not synchronized

Question 14

Which THREE technologies or protocols are used to implement automated service provisioning in a Cisco service provider network?

Accepted Answer

Cisco NSO. Cisco NSO (Network Services Orchestrator) is a key technology for automated service provisioning because it provides a multi-vendor, service-oriented orchestration layer that uses YANG models and NETCONF to manage device configurations and service lifecycles. It enables operators to define services as templates, then push consistent configurations across the network, drastically reducing manual CLI-based provisioning.

Answer

SNMP

Answer

RIP

Question 15

Refer to the exhibit. A telemetry subscription is configured on an IOS-XR router. The collector at 10.1.1.100 is not receiving data. Which configuration error is present?

Accepted Answer

Missing 'protocol' specification in the destination-group. In IOS-XR telemetry, a destination-group must include the 'protocol' keyword (e.g., 'protocol grpc' or 'protocol tcp') to specify the transport protocol for the collector. Without this specification, the router does not know how to send the telemetry data, and the collector at 10.1.1.100 will not receive any data.

Answer

The destination IP address is incorrect

Answer

The sample-interval is too short

Answer

The subscription is not committed

Answer

The sensor-group path is invalid