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Difficulty: MediumSNMP Operations, MIBs, Traps, Informs, and Version Differences

A network engineer is configuring network telemetry across enterprise routers. Which two statements accurately describe SNMP notifications and SNMPv3 security level capabilities?

  1. SNMP Informs require the receiving Network Management System (NMS) to send an acknowledgment back to the agent.Answer
  2. B
    SNMP Traps use TCP port 162 to establish a reliable connection before delivering notifications.
  3. The authPriv security level in SNMPv3 provides HMAC-based message authentication as well as packet payload encryption.Answer
  4. D
    The authNoPriv security level encrypts packet payloads using AES while skipping user authentication.

Answer

SNMP Informs require the receiving Network Management System to acknowledge receipt with a Response PDU, and the SNMPv3 authPriv security level provides both user authentication and packet payload encryption.
SNMP Informs provide reliable delivery by requiring the receiving Network Management Station to acknowledge receipt using an SNMP Response PDU. Additionally, the SNMPv3 authPriv security level provides authentication using HMAC algorithms such as SHA/MD5 and encryption using algorithms such as AES.

Step-by-Step Solution

1
Analyze notification operational mechanics
Identify that SNMP Traps are unacknowledged UDP messages (destination port 162), whereas SNMP Informs require an explicit Response PDU acknowledgment from the receiver.
Traps are fire-and-forget, whereas Informs add application-layer reliability via acknowledgments.
2
Evaluate SNMPv3 security levels
Differentiate between noAuthNoPriv (no authentication, no encryption), authNoPriv (authentication enabled, no encryption), and authPriv (both authentication and privacy/encryption enabled).
authPriv is the only tier offering both authentication and encryption.

Key Concept

SNMP Notification Reliability (Traps vs Informs) and SNMPv3 Security Models (authPriv vs authNoPriv)
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Topics

SNMP Operations, MIBs, Traps, Informs, and Version Differences

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