Which of the following will help achieve redundancy in virtual switches?

The focus on achieving redundancy in virtual switches typically involves networking concepts rather than authentication protocols. In the context of your choices, the combination of port channeling and multiple physical Network Interface Cards (NICs) is essential for ensuring that if one path fails, another can take over without disrupting network connectivity.

Port channeling allows you to combine multiple physical connections into a single logical channel, which provides load balancing and redundancy. If one link within the channel fails, the other links carry the traffic, maintaining network connections and performance. Utilizing multiple physical NICs further adds to this redundancy because if one NIC fails, the system can seamlessly switch to another NIC.

Authentication methods like Kerberos and CHAP are not directly related to achieving redundancy in network configurations; they focus more on ensuring secure access and identity verification in network communications. Thus, while they are critical for security, they do not contribute to the redundancy aspect necessary for virtual switches.

Hence, the effective solution for achieving redundancy in virtual switches lies in the use of port channeling along with multiple physical NICs, which enhances network resilience and availability.