Estimated Reading Time: 4 minutes

Network Assurance (10%)

Using Troubleshooting Tools to Diagnose Network Issues

Debugs: Understand how to use the debug command for real-time monitoring and troubleshooting network issues, such as debug ip packet, debug ip routing, etc. Be aware of the potential performance impact.
Conditional Debugs: Learn how to set conditional debugging to filter and focus on specific traffic or events, reducing the impact of the debug command.
Traceroute: Master how to use the traceroute command to diagnose network path issues, and understand the variations of this command across different operating systems and how to interpret its output.
Ping: Become proficient in using the ping command to test connectivity and latency, and learn how to interpret TTL, latency times, and packet loss.
SNMP: Understand Simple Network Management Protocol (SNMP), including its structure (such as MIBs, OIDs), and how to use SNMP tools (e.g., snmpwalk) to monitor and manage network devices.
Syslog: Configure and interpret syslog messages, understanding the significance of different severity levels (emergencies, alerts, critical, errors, warnings, notifications, informational, debugging).

Basic Concepts: Understand the concept of Flexible NetFlow, its benefits, and how it differs from traditional NetFlow.
Configuration Steps: Learn how to configure Flexible NetFlow, including defining flow records, flow exporters, and flow monitors.
Verification Methods: Master how to verify NetFlow configuration using commands like show flow monitor, and how to analyze NetFlow data using tools.

SPAN: Learn how to configure local port mirroring (SPAN) to capture traffic on the same switch.
RSPAN: Master how to configure Remote Port Mirroring (RSPAN) to capture traffic across switches by transferring mirrored traffic through a VLAN.
ERSPAN: Understand Enhanced Remote Port Mirroring (ERSPAN), including how to transport mirrored traffic over IP networks, and learn its configuration.

Basic Concepts: Understand the purpose of IP Service Level Agreement (IP SLA) for monitoring metrics such as latency, jitter, and packet loss.
Configuration Steps: Learn how to configure IP SLA operations (such as ICMP echo, UDP delay, etc.) and schedule these operations.
Verification Methods: Master how to verify IP SLA configuration and results using commands like show ip sla statistics.

DNA Center Features: Understand the features and components of Cisco DNA Center, including network automation, assurance, optimization, and security.
Workflows: Familiarize yourself with DNA Center workflows, such as how to perform automatic device discovery, configuration deployment, policy application, network monitoring, and troubleshooting.
Use Cases: Learn how to use DNA Center for specific tasks like software upgrades and policy compliance checks.

NETCONF: Understand the concept of the Network Configuration Protocol (NETCONF) and how to manage configurations using YANG models.
RESTCONF: Learn about RESTful Network Configuration Protocol (RESTCONF), including how to manage network devices using HTTP methods (such as GET, POST, PUT, DELETE).
Configuration Steps: Learn how to enable and configure NETCONF and RESTCONF on devices, and how to verify using tools such as Postman.
Practical Use Cases: Master specific examples of NETCONF and RESTCONF operations for practical application and troubleshooting.

References
Cisco Learning Network
Cisco Port Monitoring
Cisco NetFlow