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21.
What types of applications would be heavily disrupted if the client device were to change
IPs? (Choose all that apply.)
- A.Telnet
- B.SIP
- C.SSH
- D.HTTP
- E.FTP
- Answer & Explanation
- Report
Answer : [A, B, C, E]
Explanation :
Explanation :
| Session - based protocols like Telnet, SIP, SSH, and FTP will cause the session to be terminated if a client device were to be assigned a new IP address. |
22.
As a general design practice, what minimum PHY rate is recommended to ensure
VOWLAN quality?
- A.11 Mbps
- B.18 Mbps
- C.24 Mbps
- D.36 Mbps
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| It is unrealistic to maintain 54 Mbps PHY rates— client devices will never decide to roam. However, dropping too low will cause more rate shifting than desired and impact the performance of other wireless devices. 24 Mbps is a good metric to design for the lowest PHY rate during device roams in MCA environments. |
23.
What of the following solutions ensure that client devices do not change IP addresses as a
device roams? (Choose all that apply.)
- A.Use a WLAN controller or an infrastructure AP that incorporates IP mobility features.
- B.Use larger IP subnets for your device pool and ideally disable broadcast suppression.
- C.Use a mobile IP software product that can be used to traverse different operators ’ networks.
- D.Do not turn the device off after it has powered up.
- E.Keep each floor of a building to a single subnet and hopefully devices will not move between floors.
- Answer & Explanation
- Report
Answer : [A, B, C]
Explanation :
Explanation :
| Options A, B, and C are all valid options. Option D will not provide any value unless one or more of A, B, or C is used. Option E is not a valid solution because RF propagates and reflects between fl oors of a building. |
24.
When the timing of voice traffic arrives with a high degree of variable timing, what is this
considered?
- A.Latency
- B.IFS
- C.TDOA
- D.Jitter
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Jitter is caused by variability in the time traffic is sent and received. |
25.
As a device starts to shift to lower PHY rates, what factors usually influence a device
decision to shift to lower PHY rates? (Choose all that apply.)
- A.Signal degradation
- B.Retransmissions
- C.Interference
- D.Packet loss
- Answer & Explanation
- Report
Answer : [A, B, C, D]
Explanation :
Explanation :
| All of these factors can result in rate shifting of wireless stations. |
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