This chapter provides an overview of tools that can be utilized to monitor and troubleshoot Cisco devices.  SNMP is a major component of monitoring Cisco devices.  SYSLOG is a facility that can be utilized to log messages for either real-time NETFLOW is a protocol that utilizes the environment coupled with tools to understand network traffic and how it is flowing.


For our SNMP Overview, we are going to cover many different componets that you will see on your Cisco CCNA exam.  Such as what the Manager does, how SNMP works, the Agents role and what MIBs are.  You need to be familiar with all of these terms for your CCNA test.


•Polls agents on the network
•Correlates and displays information
•  SNMP:
•Supports message exchange
•Runs on IP
•  Agent:
•Collects and stores information
•Responds to manager requests for information
•Generates traps
•  MIB:
•Database of objects
(information variables)
•Read and write community strings for controlling access





SNMP supports three differnet versions: 1, 2c and 3.

Both SNMPv1 and SNMPv2c use plaintext authentication whereas SNMPv3 implemented strong authentication.

SNMPv2c implemented a bulk retrieval mechanism which is also available in SNMPv3.

Cisco CCNA SNMPv2 Features

SNMPv2 is defined in RFC 1901 and some new features are the Get Bulk Request, Inform Request and data types with 64-bit values.


For the Cisco CCNA exam, it also covers SNMPv3 and some of it’s key upgrades such as support for Authentication and privacy, authorization and access control, usernames and key management and remotely configurable via SNMP operations.

Cisco CCNA SNMP Recommendations

Some basic SNMP recommendations are to configure ACKs for SNMP community strings, restrict SNMP traffic to addresses in an ACL and use SNMPv3 if possibel for the authentication and encryption features.

Cisco CCNA SNMP Configuration

The access list implemented allows any host on the network to poll for SNMP requests.  The Read Only community string is set to “cisco” while the Read Write community string is set to “xyz123”.  SNMP Traps will be sent to

sw(config)# access-list 100 permit ip any

sw(config)# snmp-server community cisco RO 100

sw(config)# snmp-server community xyz123 RW 100

sw(config)# snmp-server trap