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| Section | Weight | Objectives |
|---|---|---|
| Wireless Site Survey | 25% | - Pre-deployment site survey - 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 - Post-deployment site survey |
| Wired and Wireless Infrastructure | 30% | - Design wireless bridging (mesh) - Physical infrastructure requirements - Design high-density wireless networks - Design for data, voice, video, location - Design radio management - Logical infrastructure requirements |
| Mobility | 25% | - Design mobility groups - Validate mobility tunneling - Site Tags - Optimize client roaming |
| WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
>> 300-110 Prüfungsvorbereitung <<
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79. Frage
A customer has two Cisco wireless controllers named WLC-A and WLC-B. Each controller is in a different building on a campus. The WLCs have different Layer 3 interfaces and broadcast the same SSIDs from their respective APs. Users must remain connected to the same VLAN and maintain their IP addresses during roaming from the APs attached to WLC-A and WLC-B. Which action accomplishes the requirement?
Antwort: C
Begründung:
The requirement for users to retain their VLAN assignment and IP address when roaming between buildings managed by different WLCs is a Layer 3 roaming scenario. In Cisco's wireless architecture, IP address preservation across controller boundaries is achieved through inter- controller mobility -- specifically the foreign-anchor mobility tunnel mechanism. When a client roams from Building A (WLC-A) to Building B (WLC-B), WLC-B becomes the foreign controller and WLC-A becomes the anchor controller. WLC-B tunnels the client's traffic back to WLC-A, allowing the client to retain its original IP address even while physically associated to an AP managed by WLC-B. This requires creating a mobility group between WLC-A and WLC-B with both controllers configured with the same mobility group name -- the group name is the trust identifier that permits the mobility tunnel and anchor-foreign relationship to form.
80. Frage
A customer has two Cisco WLCs configured in a SSO cluster. The wireless network supports a large warehouse. The customer purchases new iPads to replace legacy scanners. Both devices connect to a single SSID named Scanning by using WPA2 Personal. The customer wants to use a standards-based method for fast roaming on the new iPads. Which approach meets the scanner requirement and still supports the legacy scanners?
Antwort: A
Begründung:
The design challenge is enabling IEEE 802.11r Fast BSS Transition for the new iPads (the standards- based fast roaming method) while maintaining backward compatibility for legacy RF scanners that may not support 802.11r. The SSID uses WPA2 Personal (PSK), not 802.1X enterprise authentication -- therefore the correct Fast Transition variant is FT PSK (pre-shared key), not FT 802.1X (Options A and B). The critical configuration parameter is setting Fast Transition to Adaptive mode rather than mandatory. Adaptive mode is a Cisco feature that allows the AP and SSID to support both 802.11r- capable clients (which will use FT PSK for fast roaming) and non-802.11r legacy clients (which will use the standard pre-FT roaming process). In Adaptive mode, legacy scanners that cannot negotiate 802.11r during association will fall back transparently to standard roaming, while the new iPads leverage FT PSK for minimal-interruption handoffs. If Fast Transition is set to mandatory, legacy clients that do not support 802.11r will fail to associate entirely. Option C uses optimized roaming globally, which is a different mechanism and does not address the iPads' specific need for a standards-based fast roaming solution.
81. Frage
A customer is migrating from a legacy Cisco AireOS WLC to a new Cisco 9800 IOS XE WLC with Cisco 9100 APs. The new APs must associate to the Catalyst 9800 WLC, and wireless clients must seamlessly roam between the old and new WLCs even during SSO. The new Catalyst 9800 WLC deployment is configured to use SSO. Which command must be added to meet the requirements?
Antwort: C
Begründung:
In a mixed deployment where a Cisco Catalyst 9800 IOS XE WLC operating in SSO is required to establish a mobility peer relationship with a legacy AireOS WLC, the critical configuration requirement is that the 9800 SSO pair presents a single, consistent mobility MAC address to all peer WLCs. When the 9800 is in SSO mode, the active and standby controllers function as a single logical entity, but AireOS WLCs identify mobility peers by MAC address. If the MAC address changes during an SSO switchover, the AireOS peer will detect the change and tear down the mobility tunnel, disrupting inter-controller client roaming. The command 'wireless mobility mac-address <MAC>' configures a static, persistent mobility MAC address on the 9800 SSO pair that remains constant regardless of which physical unit is active. This ensures the AireOS WLC always identifies the 9800 pair by the same MAC address, maintaining the mobility tunnel and enabling seamless client roaming.
82. Frage
An engineer is designing guest access where guest traffic from foreign controllers on the internal network must terminate in the DMZ. Which two requirements must the design satisfy? (Choose two.)
Antwort: A,E
Begründung:
Auto-anchor guest tunneling requires that the guest WLAN be configured identically on both the foreign and anchor controllers (Option B) - the SSID, security settings, and WLAN ID must match, because the anchor applies its own policy to the tunneled session and a mismatch causes the client to be dropped or assigned incorrect policy. A mobility tunnel between the two controllers (Option D) is the transport that carries the guest traffic from the internal foreign controller to the DMZ anchor, allowing the client's data to bypass the internal network entirely and terminate on the DMZ segment. Controllers must be configured as mobility peers of each other, but they do not need to share a mobility group name for auto-anchor to function, and they explicitly do not need to be in the same Layer 2 VLAN - the whole point of the design is that the anchor sits in a separate, firewalled DMZ subnet. RF group leadership is unrelated to guest tunneling.
83. 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: C
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. The selection is not based on absolute number of APs (Option D), available free licenses in absolute terms (Option A), or CPU utilization (Option C) - it specifically uses the percentage of license capacity occupied, which normalizes across controllers with different total AP capacities. Reference: WLSD Study Guide - N+1 Redundancy Default Behavior, AP Orphan Failover Logic, WLC Load-Based AP Assignment.
84. Frage
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