There are a large number of employees in a certain enterprise building, and they usually start to connect to the company's WLAN network in the lobby when they go to work. As each employee walks to…

Question

Options

• AConfigure the VLAN Pool and configure the Hash algorithm
• BConfigure the VLAN Pool and configure the sequence algorithm
• CConfigure VLAN Pool, any configuration algorithm
• DDo not configure VLAN Pool, configure a static IP address for each mobile terminal

• A
  78% (40)
• B
  6% (3)
• C
  14% (7)
• D
  2% (1)

Explanation

Option A is correct because a VLAN Pool with a Hash algorithm uses a deterministic function (typically based on the client's MAC address) to map each terminal to the same VLAN every time it connects or roams - and since DHCP assigns addresses per-VLAN, the terminal consistently receives the same IP address regardless of which AP it associates with.

Why the distractors fail:

• B (Sequence algorithm) is wrong because the sequence (round-robin) algorithm assigns VLANs in order as clients connect, so a roaming device could land in a different VLAN on re-association, causing it to receive a new IP from a different subnet.
• C ("any algorithm") is wrong because the choice of algorithm does matter - including the sequence algorithm would break IP consistency, so you cannot use just any algorithm.
• D (Static IP per terminal) is wrong because assigning static IPs is impractical at scale with a large number of employees, adds significant administrative overhead, and can cause conflicts when roaming between subnets where that address may be invalid.

Memory tip: Think of Hash = Homing - the hash function always sends the same device home to the same VLAN, just like a hash table always maps the same key to the same bucket.

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