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| Section | Weight | Objectives |
|---|---|---|
| Mobility | 25% | - Validate mobility tunneling - Site Tags - Design mobility groups - Optimize client roaming |
| Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Design radio management - Physical infrastructure requirements - Design for data, voice, video, location - Design wireless bridging (mesh) - Logical infrastructure requirements |
| Wireless Site Survey | 25% | - Planning tools and network metrics evaluation - Layer 1 site survey analysis - Pre-deployment site survey - Collect design requirements and evaluate constraints - Predictive site survey - Material attenuation and its design effects - Post-deployment site survey |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
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NEW QUESTION # 63
An engineer is designing the wired infrastructure to support VoWLAN. Which QoS design should be applied to the switch ports connecting the APs?
Answer: D
Explanation:
In a centrally switched CAPWAP deployment, client traffic is encapsulated between the AP and the controller, and the AP copies the QoS marking from the inner client packet into the DSCP field of the outer CAPWAP header. If the switch port connecting the AP does not trust DSCP, the switch rewrites those markings to zero at ingress and every voice packet loses its priority treatment for the remainder of its journey across the wired network. Trusting DSCP on the AP- facing port preserves the marking end to end and allows the campus queueing policies to place voice into the priority queue. Trusting CoS is ineffective here because the AP-to-switch link is typically an access port carrying untagged frames with no 802.1p field to trust. Leaving the port untrusted or policing it aggressively strips or drops the very traffic the design is intended to protect, and omitting trust configuration on a switch that defaults to untrusted produces the same failure.
NEW QUESTION # 64
A company has three Cisco WLCs that are joined as a mobility group. Mobility multicast messaging is enabled. All the WLCs in the mobility group communicate via a multicast. Which configuration must be identical between the three WLCs to validate communication?
Answer: B
Explanation:
When Cisco WLCs are configured to use multicast for mobility group communications, all WLCs participating in the same mobility group must be configured with an identical multicast group IP address. The mobility multicast mode allows a WLC to send a single multicast frame received simultaneously by all other WLCs in the group, rather than sending individual unicast copies to each peer. For this to function correctly, every WLC in the group must join the same IP multicast group address, and the underlying network infrastructure must be configured to support IP multicast routing or IGMP snooping for that specific group address. If any WLC is configured with a different multicast IP address, it will join a different multicast group and will not receive mobility messages from the other WLCs, effectively isolating it from the group's communication plane.
NEW QUESTION # 65
A customer is building a new warehouse facility that has only its foundation and perimeter walls built. The building will be complete in the next eight months. The customer needs a detailed bill of materials and costs for a wireless network that must support RF scanners throughout the warehouse.
How should the survey be performed?
Answer: B
Explanation:
A predictive survey (also called a virtual or model-based survey) is the appropriate and only feasible methodology for a facility that does not yet physically exist in its complete form. Since the warehouse has only its foundation and perimeter walls, it is impossible to conduct any form of physical (active or passive) survey of the complete environment. A predictive survey uses architectural floor plans imported into a tool such as Ekahau Site Survey, where the engineer defines attenuation areas representing planned materials and structures: concrete block walls, steel shelving racks, metallic surfaces, and other warehouse-specific obstructions. The software models RF propagation through these defined attenuation values, enabling accurate AP placement planning, antenna selection, and channel planning without physical access to the complete facility. The output is a validated bill of materials with AP counts, models, and associated infrastructure requirements.
NEW QUESTION # 66
An engineer is conducting a Layer 2 site survey. Which type of client must the engineer match to the survey?
Answer: A
Explanation:
When conducting a Layer 2 site survey, it is recommended to match the survey to the worst client available.
This ensures that the wireless network is designed to provide adequate coverage and performance even for clients with the poorest RF capabilities, thereby providing a consistent user experience for all devices. The worst client typically has fewer antennas, lower receiver sensitivity, and less sophisticated chipsets. By designing to its limitations, the engineer guarantees that every device in the environment meets the minimum performance threshold. Using the best client (Option A) or an average client (Option C) would result in coverage gaps for less capable devices. A phone client (Option B) may have unique characteristics but is not a universally applicable standard for general survey purposes. Reference: WLSD Study Guide - Site Survey Methodology, Client Selection for Survey, Layer 2 Pre-Deployment Survey.
NEW QUESTION # 67
A wireless engineer must design a backhaul link. The engineer has a mesh access point that has a wired connection back to the infrastructure. What must be changed in the AP role before a change is made in the AP mode?
Answer: D
Explanation:
In Cisco mesh networking architecture, access points are classified into two primary roles: Root Access Points (RAP) and Mesh Access Points (MAP). A RAP is an access point that maintains a wired Ethernet backhaul connection back to the network infrastructure, while a MAP operates wirelessly, relying on mesh backlinks to upstream RAPs. When an engineer needs to change an AP mode -- such as switching to bridge mode to extend the mesh -- the AP role must first be defined correctly. The AP must be designated as a RAP before any mode-level configuration changes are applied. This sequencing is critical because the AP role defines the fundamental backhaul path; changing the mode without first establishing the role results in misconfiguration and potential connectivity loss. The RAP communicates directly with the wired infrastructure via its Ethernet port, making it the gateway for all downstream MAPs in the mesh topology.
NEW QUESTION # 68
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