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| Section | Weight | Objectives |
|---|---|---|
| Mobility Design | 25% | - Guest mobility and BYOD design - Mobility architecture models
|
| Wireless Infrastructure Design | 30% | - High-density wireless design
|
| WLAN High Availability and Security Design | 20% | - Security architecture design
- High availability design
|
| Wireless Site Survey | 25% | - RF propagation and attenuation analysis - Layer 1 site survey execution and analysis - Pre-deployment survey and validation - Design requirements collection and constraint evaluation
|
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NEW QUESTION # 50
An enterprise is using two wireless controllers to support the wireless network. The data centre is located in the head office. Each controller has a corporate WLAN configured with different SSID names. The APs are installed using a round-robin approach to load balance the traffic. What should be changed in the configuration to optimize roaming?
Answer: C
Explanation:
To optimize roaming in a wireless network with multiple controllers, it is essential to use the same WLAN name (SSID) across all controllers. When SSIDs differ between controllers, clients perceive them as different networks and must perform a full re-association and re-authentication when roaming between APs managed by different controllers. This causes a roaming disruption equivalent to connecting to an entirely new network. By using identical SSID names on both controllers, clients can seamlessly roam between APs on different controllers within the same mobility group - the controllers exchange client state information via the mobility tunnel, enabling seamless handoff. In the scenario described, ' Copr-NET390595865WLC-1 ' and
' Copr-NET6837l638WLC-2 ' are different SSIDs, meaning clients cannot roam transparently between them.
Making both controllers broadcast the same SSID name (and using a mobility group to connect the controllers) resolves this. Reference: WLSD Study Guide - SSID Consistency Across Controllers, Inter- Controller Roaming, Mobility Group Configuration.
NEW QUESTION # 51
A company is upgrading its wireless infrastructure and is in a state of transition. Some parts of the company ' s building still run on the legacy WLC. The new WLC is not located at the same site as the legacy WLC. The company requires seamless client inter-controller roaming between the new WLC and the legacy WLC, with no disruptions. Both WLCs are separated by firewalls. Which troubleshooting command validates that the mobility control packets between the WLCs can be sent and received?
Answer: B
Explanation:
The command ' debug mobility handoff enable ' is used to validate the mobility control packets between Wireless LAN Controllers (WLCs). This command enables debugging of the handoff process, which is critical for ensuring seamless client roaming between controllers. When WLCs are separated by firewalls, it is essential to confirm that mobility control packets can traverse these firewalls without being dropped or rejected. The ' debug mobility handoff enable ' command allows network administrators to monitor the handoff process in real time and identify whether mobility PDUs are being exchanged successfully. If mobility control packets are being blocked by the firewall, this debug output will show failures in the handoff sequence. This command directly validates bidirectional mobility traffic flow, making it the correct troubleshooting tool for the scenario described. Options A and D are not valid Cisco WLC commands. Option C enables configuration-level mobility debugging but does not specifically validate handoff packet flow.
Reference: WLSD Study Guide - Mobility Troubleshooting, Debug Commands, Inter-Controller Roaming Validation.
NEW QUESTION # 52
A wireless engineer is preparing for a meeting with a customer to discuss a new wireless network design. The customer is a company that develops code and occupies a three-story building.
Which two information points does a pre-site survey questionnaire contain? (Choose two.)
Answer: A,E
Explanation:
A pre-site survey questionnaire is used to gather information before the physical survey begins, helping to define design requirements. The two most important information points it should contain are the access point density required and the applications that will run over the wireless network. Access point density (Option C) must be understood early because it depends on the number and types of users in each area, directly influencing the survey approach and AP placement strategy. Applications (Option E) are critical because they define the QoS requirements -- a company developing code may run video conferencing, large file transfers, and real-time collaboration tools, each with distinct bandwidth and latency requirements that shape the RF design criteria.
NEW QUESTION # 53
A customer has a Cisco wireless network with two Cisco Catalyst 9800 Series WLCs in a high availability cluster, 50 Cisco 2800I APs, and all SSIDs and services are 5 GHz only. A security mandate requires that rogue APs be scanned and identified in 2.4 GHz and 5 GHz bands without impacting existing client connectivity. How must the wireless network be reconfigured to meet the requirement without purchasing additional APs?
Answer: B
Explanation:
The Cisco Aironet 2800 Series APs feature a dual-radio architecture with a dedicated 5 GHz radio (slot 1) and a Flexible Radio Assignment (XOR) radio (slot 0) that can operate in either 2.4 GHz or 5 GHz, or be assigned to monitor mode for scanning functions. Since all existing SSIDs and services are 5 GHz only, the slot 1 (dedicated 5 GHz) radio is responsible for all current client connectivity - it must remain in Client Serving mode to maintain uninterrupted 5 GHz WLAN service. The XOR radio (slot 0), currently either idle or operating as a secondary 5 GHz radio, can be repurposed without impacting client service. Setting the XOR radio to Monitor mode enables it to continuously scan all channels across both the 2.4 GHz and 5 GHz spectrum for rogue AP detection, using the embedded CleanAir and WIDS capabilities. In Monitor mode, the XOR radio operates full-time as a dedicated scanner, providing rogue detection coverage on 2.4 GHz (previously uncovered since all services were 5 GHz) and supplementary scanning on 5 GHz. This eliminates the need for additional dedicated monitor mode APs. Options A, C, and D either place the slot 1 radio in a non-client-serving role (disrupting existing connectivity) or use the inappropriate Sniffer mode instead of Monitor mode for rogue detection. Reference: WLSD Study Guide - Cisco 2800 XOR Radio Architecture, Monitor Mode for Rogue Detection, Flexible Radio Assignment, WIDS Design.
NEW QUESTION # 54
An educational organization recently deployed an anchored WLAN and has a high number of client connections at any given time that stream video. The wireless infrastructure includes two Cisco 9800 WLCs. To prevent web traffic being slow, an engineer must configure the deployment to prevent excessive fragmentation of the client data. Which configuration must the engineer apply?
Answer: B
Explanation:
In an anchored WLAN deployment, client traffic is encapsulated within CAPWAP mobility tunnels between the foreign WLC (where the AP joins) and the anchor WLC (in the DMZ or designated network segment). This tunneling adds encapsulation overhead -- CAPWAP/mobility tunnel headers consume a portion of the available MTU on the transport path. When video streaming clients generate large TCP segments, these segments may exceed the effective MTU of the mobility tunnel path, causing IP fragmentation at the WLC or along the path to the anchor.
Fragmentation significantly degrades throughput and increases CPU overhead for high-volume video traffic. The correct solution is TCP MSS Clamping -- reducing the Maximum Segment Size value advertised in TCP SYN packets so that TCP endpoints negotiate a segment size remaining below the fragmentation threshold. The Cisco 9800 WLC supports TCP MSS adjustment, which intercepts TCP handshake packets and rewrites the MSS option to a value accounting for CAPWAP tunnel overhead.
NEW QUESTION # 55
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