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| Section | Objectives |
|---|---|
| Topic 1: RF Fundamentals and Design Principles | - RF behavior and propagation - Channel planning and interference mitigation - Antenna types and placement strategies |
| Topic 2: Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| Topic 3: Wireless Security Design | - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design |
| Topic 4: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Topic 5: Cisco Wireless Architecture | - Controller-based architecture (WLC) - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models |
| Topic 6: Wireless Site Survey and Requirements Analysis | - Coverage and capacity planning - Physical environment assessment and constraints - Business and technical requirements gathering |
>> 300-110 Übungsmaterialien <<
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98. Frage
A network engineer must design a new wireless solution for a company, but the budget can only stretch to include a single Cisco 9800-40 WLC. The company requires high availability between the WLC and the core switch in the event of a cable failure. The WLC must dynamically manage port redundancy and perform load balancing between APs transparently. Which design approach must the engineer take to meet the requirements?
Antwort: D
Begründung:
Link Aggregation Group (LAG) is the correct design approach for a single Cisco 9800-40 WLC that requires high availability between the WLC and the core switch in the event of a cable failure.
LAG combines multiple physical ports on the WLC into a single logical channel, providing both redundancy (traffic automatically redistributes across remaining links when one fails) and load balancing (traffic is distributed across all active links). Importantly, LAG operates transparently to AP management -- APs see a single logical uplink regardless of which physical port their traffic traverses.
99. Frage
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?
Antwort: D
Begründung:
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. Service port IP addresses (Option A) are unique per controller. Interface IDs (Option B) are locally significant identifiers. Management IP addresses (Option C) are unique per WLC and identify each peer in unicast configurations. Reference: WLSD Study Guide - Mobility Group Configuration, Multicast Mobility Messaging, WLC Peer Communication.
100. Frage
An engineer in a branch office that does not have a wired backhaul must ensure that local clients can be switched locally and authenticated centrally. In which mode must the AP be configured?
Antwort: A
Begründung:
Flex+Bridge mode is a specialized AP operating mode that combines two distinct Cisco wireless capabilities:
FlexConnect (for local switching of client data traffic and central authentication via the WLC) and Bridge
/Mesh mode (enabling wireless backhaul when no wired Ethernet uplink is available). In a branch environment without wired backhaul, a standard FlexConnect AP (Option D) cannot operate because FlexConnect still requires an Ethernet connection for its control plane. Bridge mode alone provides mesh backhaul but does not support the local switching with central authentication model required here. MAP (Option A) is a Mesh Access Point role for wireless backhaul, and RAP (Option C) is a Root Access Point with a wired connection - neither meets the no-wired-backhaul requirement with local switching.
Flex+Bridge uniquely satisfies both requirements: the Flex component allows locally switched VLANs to be bridged directly to the access layer without traversing the WAN, while the Bridge component enables the AP to use a wireless mesh link for its backhaul uplink. Central authentication is maintained via the CAPWAP control tunnel over the mesh link. Reference: WLSD Study Guide - FlexConnect Design, Mesh Networking, Flex+Bridge Mode Configuration and Use Cases.
101. Frage
Multiple WLCs are implemented in a high-availability configuration in a mobility group. APs are deployed with only a primary controller assigned. By default, which mobility group member controller do the orphaned APs join in the event of a failed controller?
Antwort: B
Begründung:
In a high-availability configuration with multiple WLCs in a mobility group, when APs that only have a primary controller configured become orphaned (their primary WLC fails), they will by default join the controller with the lowest percentage of associated APs per license capacity. This load-based selection mechanism ensures a balanced distribution of APs across the remaining controllers in the mobility group. The WLC with the lowest percentage of AP capacity utilized is chosen because it has the most headroom to accept additional APs without becoming overloaded. This prevents a single backup controller from becoming overwhelmed while others remain underutilized.
102. Frage
What happens to an AP when a flex profile name is changed in a site tag?
Antwort: D
Begründung:
On the Cisco Catalyst 9800 IOS XE WLC platform, the tag-based configuration model uses site tags to associate APs with specific profiles including a flex profile and an AP join profile. The site tag is a fundamental binding element - when any component of a site tag is modified, including renaming the flex profile associated with that tag, the WLC treats this as a material configuration change requiring the AP to re- evaluate its operational parameters. Specifically, the AP must disconnect its existing DTLS (Datagram Transport Layer Security) control plane tunnel to the WLC and re-establish it. This DTLS session disconnect and rejoin cycle is equivalent to a full AP rejoin: CAPWAP discovery, DTLS handshake, join request, configuration download, and image verification. Client service is interrupted on the affected AP during this process. Firmware updates (Option A) occur via a separate image download process. Temporary SSID disable (Option B) is not a defined behavior for profile name changes. Switching to a backup controller (Option C) requires AP failover conditions, not configuration changes. Understanding the disruptive nature of site tag modifications is essential for change management in production 9800 deployments. Reference: WLSD Study Guide - Catalyst 9800 Tag-Based Configuration Model, Site Tag Architecture, Flex Profile and AP Join Profile Management.
103. Frage
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