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76.
Which one of the following statements is true about roaming?
- A.All wireless clients use the same algorithms to trigger a roaming condition.
- B.Wireless clients can scan available channels to look for a new AP when roaming
- C.Wireless clients must roam from one AP to another on the same channel.
- D.The 802.11 standard defines a set of roaming algorithms for clients.
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Roaming algorithms are not standardized at all. Instead, each manufacturer might have its own interpretation of an algorithm. Wireless clients can scan a set of available channels when they anticipate roaming, to look for a new AP. Cisco APs and controllers can also prime a Cisco-compatible client (CCX Versions 3 and later) with a list of viable APs ahead of time, so that the client can save time without having to scan channels. |
77.
Which one of the following statements is true about a good wireless LAN design?
- A.Neighboring APs should use the same channel to promote good roaming.
- B.APs should be positioned so that their cells overlap.
- C.APs should be positioned so that their cells do not overlap at all.
- D.APs should use channels that overlap each other.
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| To promote clean roaming, neighboring APs should use different, non-overlapping channels. In addition, APs should be located such that their coverage overlaps each other by some amount, usually 15 percent to 20 percent. |
78.
When you are designing the AP channel layout for an area, which one of the following is the most important consideration?
- A.The number of channels is conserved.
- B.APs in different areas use different channels.
- C.Adjacent APs use non-overlapping channels.
- D.Clients are grouped into common channels.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Adjacent APs should always use different, non-overlapping channels. |
79.
An AP is located in the main office on the third floor of a building. The AP is configured to use channel 6 in the 2.4-GHz band. Which of the following conditions might
hinder clients as they move around on the third floor and need to roam? (Choose all
that apply.)
- A.Two other APs in the third-floor main office area use channel 6.
- B.None of the fourth-floor APs directly above the main office use channel 6.
- C.One of the second-floor APs directly below the main office uses channel 6.
- D.All of these answers are correct.
- Answer & Explanation
- Report
Answer : [A and C]
Explanation :
Explanation :
| The fourth-floor APs will not interfere with the main office AP on channel 6. However, the other third-floor APs and the second-floor AP all use channel 6. Those signals could penetrate the floor and interfere with the main office AP, causing roaming issues. |
80.
Which one of the following is the best type of wireless LAN survey to perform for a
new building that is under construction, where APs have not yet been deployed?
- A.Predictive survey
- B.Passive survey
- C.Active survey
- D.Performance survey
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| If the building is under construction, the walls have probably not been built yet. Therefore, it doesn’t make sense to try a passive or active site survey because there are no APs to measure and no final building materials to affect the RF signals. Instead, a predictive survey is used to calculate AP locations and RF coverage over a virtual area before APs have been deployed. |
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