Which of the following descriptions about the home agent in roaming is correct? (Multiple choice)

Question

Options

• AThe home agent is a device that can communicate with the gateway of the STA's home network at
• BThe home agent is concurrently served by HAC or HAP
• CThe home agent is concurrently served by HAC or FAP
• DThe home agent only exists in the roaming network between ACs

• A
  80% (16)
• C
  5% (1)
• D
  15% (3)

Explanation

A is correct because the home agent (HA) is specifically a logical entity that maintains communication with the gateway of the STA's (station's) home network, enabling packet forwarding between the home and visited networks during roaming. B is correct because the home agent function is served concurrently by either the HAC (Home Access Controller) or HAP (Home Access Point), meaning it can reside at either the controller or AP level within the home network infrastructure.

C is wrong because a FAP (Foreign Access Point) belongs to the visited network, not the home network - the home agent is strictly associated with home-side components (HAC or HAP), never foreign ones. D is wrong because the home agent is not limited to inter-AC roaming scenarios; it is a permanent entity in the home network that operates regardless of whether roaming is occurring.

Memory tip: Think "Home Agent = Home hardware only." The HA always pairs with HAC or HAP (both start with H for Home) - never with FAP (F for Foreign). If the option mixes "home agent" with anything foreign, it's wrong.

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