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| Section | Weight | Objectives |
|---|---|---|
| Wired and Wireless Infrastructure | 30% | - Logical infrastructure requirements - Design for data, voice, video, location - Design high-density wireless networks - Design wireless bridging (mesh) - Physical infrastructure requirements - Design radio management |
| WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Wireless Site Survey | 25% | - Material attenuation and its design effects - Layer 1 site survey analysis - Collect design requirements and evaluate constraints - Post-deployment site survey - Predictive site survey - Planning tools and network metrics evaluation - Pre-deployment site survey |
| Mobility | 25% | - Optimize client roaming - Site Tags - Design mobility groups - Validate mobility tunneling |
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NEW QUESTION # 59
An engineer must reduce roaming delay for wireless medical carts running a real-time application on an 802.1X-secured WLAN. Which feature should be included in the design to eliminate the full reauthentication on each roam?
Answer: A
Explanation:
On an 802.1X/WPA2-Enterprise WLAN, a standard roam requires the client to complete a full EAP exchange with the authentication server plus a four-way handshake, which typically takes hundreds of milliseconds and is enough to break a real-time session. 802.11r Fast Transition solves this by caching the master key material and pre-establishing the key hierarchy so the client can complete the roam with an abbreviated exchange, reducing roam time to well under 50 ms.
This is the only option in the list that eliminates the reauthentication itself. 802.11k assists roaming by providing the client a neighbor report so it does not have to scan every channel to find candidate APs, and 802.11v allows the infrastructure to steer a client toward a better AP - both reduce the time spent deciding where to roam, but neither shortens the authentication exchange once the target AP is chosen. Aironet IE carries Cisco-specific information elements and is unrelated to fast roaming key handling.
NEW QUESTION # 60
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: B
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, which has a dedicated third scanning radio that requires the additional power budget provided by 802.3bt. IEEE 802.3ac is a standard related to VLAN tagging and is 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. Reference: WLSD Study Guide - Wired Infrastructure Design, PoE Standards and Power Budget Planning, Cisco 4800 Series AP Specifications.
NEW QUESTION # 61
During a post-deployment site survey, issues are found with non-Wi-Fi interference. What should the engineer use to identify the source of the interference?
Answer: D
Explanation:
Cisco Spectrum Expert is a dedicated spectrum analysis tool designed to identify and analyze non-Wi-Fi interference sources at Layer 1. During a post-deployment site survey, it can detect interference from various devices such as cordless phones, Bluetooth devices, microwave ovens, video cameras, and other unlicensed RF emitters. The tool provides a visual representation of the RF environment across the frequency spectrum, allowing engineers to pinpoint the exact source of interference and characterize it by duty cycle, frequency, and interference pattern. A network analysis module (Option A) operates at Layer 2 and above, unable to detect non-802.11 RF emissions. Wireless intrusion prevention (Option B) detects rogue APs and 802.11 attacks but not Layer 1 RF noise. Wireshark (Option C) is a packet capture tool for Layer 2-7 analysis and cannot detect non-Wi-Fi RF energy. Reference: WLSD Study Guide - Layer 1 Spectrum Analysis, Post- Deployment Survey, Non-Wi-Fi Interference Identification.
NEW QUESTION # 62
An engineer must assess an existing company WLAN to determine the possibility for future IEEE
802.11ac Wave 2 wireless deployment. All access switches are Fast Ethernet-capable only, and the wired infrastructure between existing APs and access switches is based on the CAT 6A standard. Which two actions provide maximum support of Cisco 3800 Series access points?
(Choose two.)
Answer: A,D
Explanation:
Cisco 3800 Series APs support IEEE 802.11ac Wave 2, which can deliver throughput exceeding
1 Gbps. Fast Ethernet switches are limited to 100 Mbps per port, creating a severe bottleneck.
The two actions that provide maximum support are replacing with mGig switches (Option A) and replacing with gigabit switches with 10G uplinks (Option B). mGig (Multi-Gigabit Ethernet) switches support 2.5G and 5G speeds over existing CAT 6A cabling, allowing the full throughput of 802.11ac Wave 2 APs to be utilized without replacing the existing cable plant. Gigabit switches with 10G uplinks ensure that the access layer can support 1 Gbps per AP port while providing sufficient uplink capacity.
NEW QUESTION # 63
A company is upgrading its wireless infrastructure and is in a state of transition. Some parts of the company's building still run on the legacy WLC. The new WLC is not located at the same site as the legacy WLC. The company requires seamless client inter-controller roaming between the new WLC and the legacy WLC, with no disruptions. Both WLCs are separated by firewalls. Which troubleshooting command validates that the mobility control packets between the WLCs can be sent and received?
Answer: B
Explanation:
The command 'debug mobility handoff enable' is used to validate the mobility control packets between Wireless LAN Controllers (WLCs). This command enables debugging of the handoff process, which is critical for ensuring seamless client roaming between controllers. When WLCs are separated by firewalls, it is essential to confirm that mobility control packets can traverse these firewalls without being dropped or rejected. The 'debug mobility handoff enable' command allows network administrators to monitor the handoff process in real time and identify whether mobility PDUs are being exchanged successfully. If mobility control packets are being blocked by the firewall, this debug output will show failures in the handoff sequence. This command directly validates bidirectional mobility traffic flow, making it the correct troubleshooting tool for the scenario described.
NEW QUESTION # 64
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