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| Section | Weight | Objectives |
|---|---|---|
| WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Wireless Site Survey | 25% | - Predictive site survey - Collect design requirements and evaluate constraints - Planning tools and network metrics evaluation - Material attenuation and its design effects - Layer 1 site survey analysis - Pre-deployment site survey - Post-deployment site survey |
| Wired and Wireless Infrastructure | 30% | - Logical infrastructure requirements - Design wireless bridging (mesh) - Physical infrastructure requirements - Design radio management - Design for data, voice, video, location - Design high-density wireless networks |
| Mobility | 25% | - Optimize client roaming - Validate mobility tunneling - Design mobility groups - Site Tags |
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NEW QUESTION # 63
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: C
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 # 64
An engineer must configure the virtual IP address on multiple controllers in a mobility group.
Which rule must the engineer follow to ensure proper roaming?
Answer: C
Explanation:
In a Cisco wireless mobility group, all Wireless LAN Controllers (WLCs) must be configured with the same virtual IP address to ensure proper roaming. The virtual IP address is a Layer 3 construct used by wireless clients during the DHCP renewal process when roaming between subnets managed by different WLCs. All WLCs in the same mobility group use the same virtual IP (typically from the unused 1.1.1.0/24 or similar non-routable space) so that clients receive consistent DHCP server responses regardless of which controller they are associated with.
NEW QUESTION # 65
An engineer is performing an AP-on-a-stick survey and finds that the 5 GHz channel overlap is too high when an appropriate number of APs are used for the density requirements. Which two actions during the survey reduce channel overlap? (Choose two.)
Answer: A,E
Explanation:
Raising the minimum data rate to 24 Mbps reduces the effective coverage range of each AP because clients at the cell edge operating at low data rates are effectively excluded from the cell.
This shrinks cell size, reducing channel overlap between neighboring APs on the same channel.
Using directional antennas limits the coverage area of some APs by focusing RF energy in specific directions rather than radiating omnidirectionally, which directly reduces the lateral overlap between adjacent APs.
NEW QUESTION # 66
A customer wants a network engineer to design a Cisco wireless solution that will have redundancy through SSO and LAG. APs in the executive office must reassociate to the WLC as soon as possible in the event of a failure. The WLCs are located in a remote data center. The head office uses a WAN for connectivity with the data center. Which priority must be incorporated in the design to be assigned to the executive APs?
Answer: C
Explanation:
Cisco WLC AP Failover Priority governs the order in which APs are processed when a WLC recovers and APs begin re-associating. The priority levels are: Critical, High, Medium, and Low. During recovery situations, the WLC will accept and process AP join requests in order of priority - Critical priority APs are processed first, before all other priority levels. In a deployment where the WLC is located in a remote data center connected via WAN, the join process for all APs is slower due to WAN latency and potential bandwidth constraints. Under these conditions, assigning Critical priority to executive office APs ensures they are at the front of the processing queue and restore service before lower-priority APs. The executive office designation implies business-critical operations requiring the fastest possible wireless restoration - a requirement that directly maps to the Critical priority level. High priority (Option A) would position the executive APs second in the queue behind any Critical priority APs. Medium (Option B) and Low (Option C) would place them further down the processing order. Reference: WLSD Study Guide - AP Failover Priority Configuration, N+1 and SSO Redundancy Design, WAN-Linked Controller Deployments.
NEW QUESTION # 67
How are mobility groups created, excluding mobility anchors?
Answer: D
Explanation:
Mobility groups are created by configuring each Wireless LAN Controller (WLC) to use the same mobility domain name (mobility group name) and defining each WLC as a peer in the static mobility members list of every other WLC in the group. This bidirectional configuration establishes the trusted peer relationship and enables WLCs to exchange client information, security credentials, and state data for seamless roaming. The same mobility group name on all WLCs creates a shared identity; the static peer list defines which controllers are trusted mobility partners and provides their management IP addresses and MAC addresses for tunnel establishment. Option A is incorrect because members should run compatible (ideally the same) software versions, not different ones. Option B is incorrect - all WLCs in a mobility group must use the same virtual IP address for proper roaming. Option D is incorrect - in an HA SSO pair, the pair presents as a single logical mobility entity, not as two separate peers. Reference: WLSD Study Guide - Mobility Group Configuration, Peer Configuration Requirements, Mobility Domain Architecture.
NEW QUESTION # 68
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