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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: MAC Sublayer and Functions | 25% | - MAC frame formats and types - MAC layer troubleshooting - MAC addressing and operations - QoS and power management |
| Topic 2: Spectrum Analysis | 10% | - Interference detection and classification - Spectrum analysis tools - RF spectrum fundamentals - Troubleshooting RF issues |
| Topic 3: Protocol Analysis | 15% | - Capture and decode process - Analysis tools and methods - Protocol analysis fundamentals - Troubleshooting using protocol data |
| Topic 4: WLAN Medium Access | 10% | - Medium access performance analysis - Contention and coordination functions - CSMA/CA and medium access rules - Medium access related issues |
| Topic 5: PHY Layers and Technologies | 10% | - PHY layer troubleshooting - Channelization and frequency usage - Modulation and coding schemes - 802.11 physical layer standards |
| Topic 6: 802.11 Frame Exchanges | 30% | - Data transfer and protection mechanisms - Association and authentication processes - Frame exchange sequences - Frame exchange troubleshooting |
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NEW QUESTION # 96
Prior to a retransmission what happens to the CWmax value?
Answer: D
Explanation:
Before a retransmission, the CWmax (Contention Window maximum) value doubles and increases by 1. The CWmax is a parameter that determines the upper limit of the random backoff time that a STA (station) has to wait before attempting to access the medium. The random backoff time is chosen from a range of values between CWmin (Contention Window minimum) and CWmax. The CWmin and CWmax values depend on the AC (Access Category) of the traffic and the PHY type of the STA. If a transmission fails due to a collision or an error, the STA has to retransmit the frame after waiting for another random backoff time. However, to reduce the probability of another collision, the STA increases its CWmax value by doubling it and adding 1.
This increases the range of possible backoff values and spreads out the STAs more evenly. The STA resets its CWmax value to its original value after a successful transmission or after reaching a predefined limit. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page
196-197
NEW QUESTION # 97
Which one of the following should be the first step when troubleshooting a WLAN issue?
Answer: D
Explanation:
Troubleshooting must begin by clearly defining the problem to ensure that the issue is accurately understood, including scope, symptoms, affected users, and impact. Without properly defining the problem, subsequent steps such as scanning, hypothesizing causes, or selecting capture locations may be misdirected and inefficient. A precise problem definition establishes the foundation for an effective and structured troubleshooting process.
NEW QUESTION # 98
Protocol analyzers may present field values in either binary, decimal or hexadecimal. What precedes a hexadecimal value to indicate it is hexadecimal?
Answer: C
Explanation:
Hexadecimal values are conventionally prefixed with "0x" to indicate that the number is represented in base 16. This notation distinguishes hexadecimal values from decimal or binary formats in protocol analyzers and programming contexts.
NEW QUESTION # 99
During an initial install of a controller-based WLAN, the APs are not locating the WLAN controller. The controller is two router hops away from the nearest AP. DHCP is not used. When performing a packet trace, you see a DNS response code of 3 targeted at one of the APs.
What is the problem?
Answer: D
NEW QUESTION # 100
Using a portable analyzer you perform a packet capture next to a client STA and you can see that the STA is associated to a BSS. You observe the STA sending packets to the AP and the AP sending packets to the STA. Less than 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still less than 2%, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?
Answer: B
Explanation:
When capturing near the client, both uplink and downlink traffic are visible, confirming that communication between the client and AP is functioning properly. After moving near the AP, only downlink frames are visible while the retry rate remains low, indicating the AP is successfully receiving client frames. This behavior suggests the portable analyzer lacks sufficient receive sensitivity to detect the weaker client transmissions at that location, even though the AP, with better receiver sensitivity, can decode them successfully.
NEW QUESTION # 101
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