There are two algorithms for assigning VLAM in VLAN Pool: Sequential Algorithm and Hash Algorithm. Which of the following are the characteristics of Hash Algorithm? (Multiple choice)

Question

Options

• AUsers can be assigned to the same VLAN when they go online multiple times, and the IP usually
• BThe number of users in each VLAN is evenly divided
• CThe number of users in each VLAN is unbalanced
• DWhen the user goes online again, the VLAN is easy to change, and the IP will also change

• A
  78% (18)
• B
  13% (3)
• D
  9% (2)

Explanation

Hash Algorithm uses a deterministic mapping function (typically based on a user's MAC address or identifier) to assign a VLAN, meaning the same user always maps to the same VLAN on every login - so their IP address typically remains stable (A is correct). Because hash functions don't guarantee uniform distribution across all VLANs, some VLANs may end up with significantly more users than others, making user distribution unbalanced (C is correct).

Why B is wrong: Even distribution across VLANs is the hallmark of the Sequential Algorithm, which cycles through VLANs in order like a round-robin, naturally balancing user counts.

Why D is wrong: VLAN changing on reconnect also describes the Sequential Algorithm - since it simply assigns the next VLAN in sequence regardless of who the user is, reconnecting users land in a different VLAN with a different IP.

Memory tip: Think "Hash = Habitual" - a hashed user is a creature of habit, always returning to the same VLAN. Sequential is the fair distributor that spreads users evenly but gives no guarantees about consistency.

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