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| Section | Weight | Objectives |
|---|---|---|
| Wired and Wireless Infrastructure | 30% | - Design radio management - Logical infrastructure requirements - Design for data, voice, video, location - Design wireless bridging (mesh) - Physical infrastructure requirements - Design high-density wireless networks |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Wireless Site Survey | 25% | - Planning tools and network metrics evaluation - Post-deployment site survey - Collect design requirements and evaluate constraints - Layer 1 site survey analysis - Predictive site survey - Pre-deployment site survey - Material attenuation and its design effects |
| Mobility | 25% | - Design mobility groups - Optimize client roaming - Site Tags - Validate mobility tunneling |
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NEW QUESTION # 55
A customer has multiple WLCs running in N+1 redundancy with APs load balanced between the WLCs. The customer performs AP failover testing between the WLCs and notices that some of the APs do not move back to their primary WLC after it recovers. What are two points that must be addressed in the design? (Choose two.)
Answer: A,B
Explanation:
In an N+1 redundancy deployment, an AP's ability to return to its designated primary WLC after that controller recovers depends on two distinct configuration requirements working in concert.
First, the AP Fallback feature (Option C) must be enabled on the WLC. AP Fallback instructs APs to monitor the availability of their configured primary controller and automatically reconnect to it when it becomes available again, rather than remaining permanently joined to the N+1 backup controller. Without AP Fallback enabled, APs stay connected to whichever controller they most recently joined. Second, the APs must have their primary WLC information correctly configured (Option D). If an AP does not have the primary controller's name, IP address, or FQDN correctly set, it cannot identify when its designated primary has recovered and therefore cannot initiate a return fallback.
NEW QUESTION # 56
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.
NEW QUESTION # 57
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. Setting matching MTUs (Option A) does not prevent fragmentation if the effective tunnel MTU is lower than the client segment size. Increasing the MTU (Option B) is often constrained by physical infrastructure. Setting the DF bit (Option D) would cause packets to be dropped rather than fragmented.
Reference: WLSD Study Guide - Anchored WLAN Design, CAPWAP Mobility Tunnel MTU, TCP MSS Clamping.
NEW QUESTION # 58
A campus has two controllers, each with client VLANs on different subnets. A client associated to an AP on WLC-1 roams to an AP on WLC-2. Which behavior does the mobility design produce, and what is required?
Answer: A
Explanation:
When a client roams between controllers whose client VLANs are on different subnets, the controllers perform a Layer 3 roam. The original controller retains the role of anchor for that client's session, the new controller becomes the foreign controller, and a mobility tunnel between them carries the client's traffic so the client can retain its existing IP address and keep its sessions alive. Cisco controllers use asymmetric tunneling for this: traffic from the client is forwarded by the foreign controller, while traffic destined for the client is tunneled from the anchor to the foreign controller, which preserves reachability without requiring the client to renumber. A Layer 2 roam occurs only when both controllers place the client on the same subnet, and it still requires the controllers to be mobility peers so client context can be exchanged. Forcing a new IP address or a full reauthentication would break the client's applications, which is precisely what the mobility architecture is designed to prevent.
NEW QUESTION # 59
A university wants to deploy a high density of APs in an area where a high number of users congregate.
Which functionality allows the university to optimize the RF settings for APs that operate in different environments or coverage zones?
Answer: D
Explanation:
RF Profiles are a Cisco WLC configuration construct that allows administrators to define a customized set of Radio Resource Management (RRM) parameters and apply them to a subset of APs operating in a specific environment or coverage zone. Within a university high-density deployment - where a lecture hall, outdoor quad, cafeteria, and library may each require fundamentally different RF settings - RF Profiles enable differentiation without globally modifying all RRM parameters. An RF Profile can define custom values for:
minimum mandatory data rates, maximum transmit power, minimum transmit power, channel width (20/40
/80 MHz), RxSOP thresholds, client load balancing parameters, and coverage hole detection sensitivity. This allows the engineer to apply aggressive interference mitigation settings to high-density assembly areas while maintaining full-coverage settings for perimeter zones. AP Groups (Option A) assign WLANs and interface mappings to subsets of APs but do not directly control RF parameters. RF Groups (Option B) are automatically formed by RRM and represent a cluster of APs coordinating channel and power assignment. AP Profiles (Option C) define AP behavior parameters such as NTP and SSH settings, not RF optimization parameters. Reference: WLSD Study Guide - RF Profile Configuration, High-Density WLAN Design, RRM Parameter Customization.
NEW QUESTION # 60
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