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Which four statements about SNMP implementation on the Cisco Nexus 7000 Series switch are true? (Choose four.)
A. Cisco NX-OS supports one instance of the SNMP per virtual device context.
B. By default, Cisco NX-OS uses the default VDC for SNMP.
C. SNMP supports multiple MIB module instances and maps them to logical network entities.
D. SNMP is VRF aware. You can configure SNMP to use a particular VRF to reach the SNMP notification host receiver.
E. Only SNMP version 3 is supported on NX-OS.
F. Cisco NX-OS supports one instance of the SNMP per switch.
G. Each VDC can have multiple SNMP sessions configured in it.
Correct Answer: ABCD
Explanation/Reference:
Explanation:
The Simple Network Management Protocol (SNMP) is an application-layer protocol that provides a message format for communication between SNMP managers and agents. SNMP provides a standardized framework and a common language used for the monitoring and management of devices in a network.
SNMP has different versions such as SNMPv1, v2, and v3. Each SNMP version has different security models or levels. Most Enterprise customers are looking to implement SNMPv3 because it offers encryption to pass management information (or traffic) across the network. The security level determines if an SNMP message needs to be protected and authenticated. Various security levels exist within a security model:
noAuthNoPriv: Security level that does not provide authentication or encryption.
authNoPriv: Security level that provides authentication but does not provide encryption.
authPriv: Security level that provides both authentication and encryption.
Cisco NX-OS supports the following SNMP standards:
SNMPv1: Simple community-string based access.
SNMPv2c: RFC 2575-based group access that can be tied into RBAC model.
SNMPv3: Enables for two independent security mechanisms, authentication (Hashed Message Authentication leveraging either Secure Hash Algorithm [SHA-1] or Message Digest 5 [MD5] algorithms) and encryption (Data Encryption Standard [DES] as the default and Advanced Encryption Standard [AES]) to ensure secure communication between NMS station and N7K/NX-OS. Both mechanisms are implemented as demonstrated in Example 1-8.
As NX-OS is truly modular and highly available, the NX-OS implementation of SNMP supports stateless restarts for SNMP. NX-OS has also implemented virtualization support for SNMP; NX-OS supports one instance of SNMP per virtual device context (VDC). SNMP is also VRF-aware, which allows you to configure SNMP to use a particular VRF to reach the network management host.
Reference: http://www.ciscopress.com/articles/article.asp?p=1609856&seqNum=3 (see the topic, ‘SNMP’)