1. Look at the first frame. What is the role of a Beacon frame in IEEE 802.11? W

Question

1.      Look at the first frame. What is the role of a Beacon frame in IEEE 802.11? Why is this frame not necessary in IEEE 802.3 Ethernet?

2.      Which device on the wireless LAN sends out the beacon frame? Based on this information, what is the MAC address of the wireless router?

3.      Based on the above question and the information in the beacon frame header fields, what information serves as the basic service set (BSS) identifier?

4.      The second packet in the capture is a probe request. What is the role of a probe-request frame in IEEE 802.11? Why is this frame not necessary in IEEE 802.3 Ethernet?

Explanation / Answer

1) The role of a Beacon frame of IEEE 802.11 is to advertise the presence of an AP in an area, it capabilities, and some configuration and security information. It is not necessary in IEEE 802.3 Ethernet because it is connected via cables.

2) The laptop sends out the beacon frame. The MAC address of the wireless router is 00-21-91-E6-35-DB.

3) The MAC address of the wireless access point is generated and serves as the BSS identifier.

4) A probe-request is used to obtain information from another station. It is not necessary in IEEE 802.3 Ethernet because it is already connected with other stations.

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