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| Section | Weight | Objectives |
|---|---|---|
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Design wireless bridging (mesh) - Design radio management - Design for data, voice, video, location - Physical infrastructure requirements - Logical infrastructure requirements |
| Wireless Site Survey | 25% | - Pre-deployment site survey - Planning tools and network metrics evaluation - Post-deployment site survey - Predictive site survey - Layer 1 site survey analysis - Material attenuation and its design effects - Collect design requirements and evaluate constraints |
| Mobility | 25% | - Design mobility groups - Site Tags - Optimize client roaming - Validate mobility tunneling |
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NEW QUESTION # 92
A hospital has a Cisco Catalyst 9800 Series Wireless Controller in an SSO solution deployed in the primary data center. The hospital plans to increase redundancy in the wireless environment. Management decides to deploy an extra Catalyst 9800 WLC offsite to another data center on a different subnet. A WAN link connects the data centers with a firewall at both ends. Which two design approaches must the engineer take to ensure that the APs can fail over? (Choose two.)
Answer: B,D
Explanation:
For APs to be able to fail over between a primary SSO pair in one data center and a standalone WLC in a remote data center connected via WAN with firewalls, two design requirements must be met. First, a mobility tunnel must be created between the wireless controllers (Option A). The mobility tunnel enables the controllers to exchange mobility control messages, peer information, and eventually AP context when failover occurs. Without the mobility tunnel, the remote WLC is not recognized as a valid failover target by the APs through the mobility domain. Second, UDP ports 16666 and 16667 must be open through the firewalls between the controllers (Option D). UDP port 16666 is used for mobility control traffic and UDP port 16667 is used for mobility data traffic - both must be permitted through the firewalls at both data centers for the mobility tunnel to establish and function. HTTPS port 443 (Option B) is used for web management and API communication, not for mobility tunneling. A static RF group leader (Option C) is a RRM configuration unrelated to AP failover capability. Creating a mobility group with the same names (Option E) is a component of the configuration but alone is insufficient without the mobility tunnel and open firewall ports. Reference:
WLSD Study Guide - Inter-Site WLC Failover Design, Mobility Tunnel Requirements, Firewall Port Planning for WAN-Separated Controllers.
NEW QUESTION # 93
A customer is planning to replace older access points with Cisco 4800 Series Access Points.
Unaware of the infrastructure requirements, the client has an engineer investigate the inline power requirement. Which IEEE 802.3 standard complies with the Cisco 4800 Series Access Points?
Answer: A
Explanation:
The Cisco Aironet 4800 Series Access Point is a tri-radio, high-performance access point designed for high-density environments. It draws significantly more power than older dual-radio APs and requires IEEE 802.3bt (also known as PoE++), which provides up to 90W per port at the Power Sourcing Equipment. IEEE 802.3af (Type 1 PoE) delivers only 15.4W and 802.3at (Type 2 PoE+) provides up to 30W -- both are insufficient for full functionality of the 4800 series. The dedicated third security radio on the 4800 pushes the power budget beyond what 802.3at can reliably support. IEEE 802.3ac is a VLAN tagging standard entirely unrelated to Power over Ethernet. Engineers designing wired infrastructure for Cisco 4800 deployments must ensure switches support 802.3bt Type 3 or Type 4 to guarantee full AP functionality across all three radios simultaneously.
NEW QUESTION # 94
A customer has two Cisco 5520 WLCs that manage all APs throughout the network. The WLCs are in different locations to provide geographical redundancy. A mobility group has been configured on both WLCs and has an UP status on both controllers. The APs in location A are statically configured to use controller A as the primary and controller B as the secondary. If the WLC in location A goes offline, the APs successfully join the WLC in location B, but they do not fail over to their primary configured controller when it recovers. Which configuration task fixes the issue?
Answer: B
Explanation:
Enabling AP fallback globally on the WLC allows access points to reconnect to their primary controller after they have connected to a secondary controller due to the primary being offline.
This is the exact behavior described in the scenario -- APs successfully fail over to the secondary WLC but do not return to the primary WLC when it recovers. AP Fallback is a WLC-level setting that monitors the availability of each AP's configured primary controller and initiates a reconnection when the primary becomes reachable again. Without AP Fallback enabled, APs remain on whatever controller they most recently joined -- in this case, the secondary -- even after the primary recovers.
NEW QUESTION # 95
An enterprise is using wireless as the main network connectivity for clients. To ensure wireless network availability, two standalone controllers are installed in the head office. APs are connected to the controllers using a round-robin approach to load balance the traffic. After a power cut, the wireless clients disconnect while roaming. An engineer tried eping from the controller but fails. Which protocol needs to be allowed between the networks that the controllers are installed?
Answer: B
Explanation:
When eping (EoIP ping) fails between two Cisco Wireless LAN Controllers, it indicates that the data path of the mobility tunnel is blocked. In Cisco AireOS wireless networks, the mobility data path uses IP Protocol 97 (EtherIP - Ethernet-over-IP encapsulation) for tunneling client traffic between the anchor and foreign controllers. This is distinct from the control path, which uses UDP port 16666. When the mobility data path (IP Protocol 97) is blocked by a firewall or ACL between the two controllers ' networks, eping will fail because eping specifically tests the EoIP data encapsulation path. After a power cut, when clients disconnect and attempt to roam between APs on different controllers, the mobility tunnel must be operational for session continuity. If IP Protocol 97 is blocked, the mobility data plane cannot function, causing client disconnections during inter-controller roaming events. The other IP protocols listed (67, 77, 87) are not used for Cisco WLC mobility tunneling. Reference: WLSD Study Guide - Mobility Tunnel Data Path, IP Protocol 97 (EtherIP), eping Command and Troubleshooting.
NEW QUESTION # 96
An engineer is performing a Layer 1 passive wireless site survey utilizing a channel analyzer software in the 2.4 GHz spectrum. Which chart indicates the ratio of interference present during the duration of the capture?
Answer: A
Explanation:
In a Layer 1 passive wireless site survey using a channel analyzer tool (such as Metageek Chanalyzer or Cisco Spectrum Expert) in the 2.4 GHz spectrum, the chart that indicates the ratio of interference present during the capture duration is the Duty Cycle chart. The duty cycle chart displays the percentage of time that detected energy -- including both Wi-Fi and non-Wi-Fi signals
-- is present on each channel. A high duty cycle on a channel indicates that the channel is occupied by transmissions for a significant portion of time, reducing available airtime for Wi-Fi clients. This chart directly communicates the ratio of interference because it shows what fraction of the observation period had detectable RF energy above the noise floor. Signal strength charts show amplitude (how strong), while duty cycle charts show temporal occupancy (how often) -- the latter is the correct metric for quantifying interference ratio.
NEW QUESTION # 97
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