Cisco Certified Network Professional Practice Test

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Which of the following is NOT a hashing component in EtherChannel?

  1. Source IP address

  2. Destination MAC address

  3. TCP/UDP port number

  4. Interface number

The correct answer is: Interface number

In EtherChannel, hashing is utilized to distribute traffic evenly across the available links in a channel. This is accomplished by creating a hash based on certain elements of the packet. The components that can contribute to this hash calculation include the source IP address, destination MAC address, and TCP/UDP port number. These elements ensure that similar types of traffic are consistently sent over the same link, which helps to maximize performance and maintain the load-balancing of traffic. The interface number, however, is not used in the hashing process. It does not play a role in how packets are distributed across the EtherChannel links. The hashing algorithm primarily focuses on identifying the unique traffic flows by examining characteristics of the packets themselves rather than the interfaces through which the packets may travel. Understanding this helps clarify why some components are essential for traffic distribution in EtherChannel while others, like the interface number, are not relevant to the hashing process.