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Snmp version

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

SNMPv2 is the second major version of the Simple Network Management Protocol, adding protocol capabilities including acknowledged inform notifications.

SNMPv2 is the second major SNMP version, adding GetBulk and Inform messages. Inform notifications require acknowledgment and are retransmitted if lost, making them more reliable than Traps. section 6.4 section 6.3

Distinguish the widely implemented versions by message support and security:

  • SNMPv1 supports Get, GetNext, Set, Trap, and Response, using community strings without encryption. section 6.3
  • SNMPv2c adds GetBulk and Inform while retaining community-string authentication; read-only and read-write strings control permitted operations. section 6.4 section 6.3
  • SNMPv3 retains the expanded message set and adds username/password hash-based authentication, message integrity, and encryption. section 6.4 section 6.3

Cisco IOS configuration

Configure community access with `snmp-server community community-string {RO | RW} [acl]`. Enable Trap messages with `snmp-server enable traps`, then identify a notification receiver with `snmp-server host ip-address [version 2c] community-string`. section 6.4

Table 6.2 SNMP versions (view table figure)

Version

Message types

Authentication

Encryption

SNMPv1

Get, GetNext, Set, Trap, Response

Community strings

No

SNMPv2c

Get, GetNext, Set, Trap, Response, GetBulk, Inform

Community strings

No

SNMPv3

Get, GetNext, Set, Trap, Response, GetBulk, Inform

Hash-based authentication with username/password

Yes

Compare SNMP versions by message types, authentication, and encryption. section 6.3

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Explains message differences, notification reliability, community access, and security, then stops short of SNMPv3 configuration.
Examples
Uses Cisco IOS community, Trap, and NMS-host configuration commands plus a version-comparison table.
What it assumes
Assumes familiarity with NMS, managed devices, OIDs, and basic SNMP operations such as Get, Set, Trap, and Response.
What you can do after
Configure SNMP community access and notification destinations, then distinguish version capabilities and security limitations.
How it connects
Connects SNMP versions with NMS, managed devices, GetBulk, Inform, Trap, community strings, authentication, and encryption.
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Related concepts

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