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| Section | Objectives |
|---|---|
| Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Coverage and capacity planning - Physical environment assessment and constraints |
| High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Wireless Security Design | - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design |
| RF Fundamentals and Design Principles | - Antenna types and placement strategies - RF behavior and propagation - Channel planning and interference mitigation |
| Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Mobility groups and roaming design - Controller-based architecture (WLC) |
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
IT業界での大手会社として、Ciscoは認証を通して専門家の標準を確認しました。認証を取得した専門家たちの給料は普通の専門家たちに比べて高いです。だから、300-110試験の認証はIT業界でのあなたにとって重要です。この認証がありましたら、あなたはもっと輝かしい未来を迎えることができます。300-110問題集の重要性が言うまでもなく、300-110問題集の選択も大切です。我々の問題集を利用して、試験に合格することができます。
質問 # 78
During a client roaming event, which device is responsible for communicating the new Layer 2 EID mapping of a wireless supplicant to the fabric domain?
正解：A
解説：
During a client roaming event in a Cisco SD-Access fabric deployment, the Wireless LAN Controller (WLC) is responsible for communicating the new Layer 2 Endpoint ID (EID) mapping of a wireless supplicant to the fabric domain. In the SD-Access architecture, the WLC acts as a mobility orchestrator and serves as the interface between the wireless domain and the wired fabric. When a client roams from one AP to another, the WLC detects the roaming event and updates the fabric control plane with the new EID-to-RLOC (Routing Locator) mapping by notifying the fabric control plane node (CP). This ensures that the fabric knows the client's new location and can route traffic correctly without interruption. The Border Node (BN) handles traffic between the fabric and external networks. CP1 and CP2 are control plane nodes that maintain the mapping database but receive EID update notifications from the WLC -- they do not initiate the EID mapping communication themselves.
質問 # 79
During a site survey for a new wireless deployment in a multifloor office building, an engineer must identify sources of interference and ensure optimal AP placement for 5 GHz coverage. While walking the site with a spectrum analyzer, the engineer notices periodic spikes in the noise floor on several channels and inconsistent signal strengths reported by the survey tool, despite visually unobstructed paths. Which action must the engineer take next to accurately assess and mitigate the Layer 1 interference?
正解：C
解説：
Layer 1 interference analysis is foundational to the Cisco site survey methodology. When a spectrum analyzer reveals periodic noise floor spikes across multiple channels with no clear line-of-sight obstruction, the root cause is almost certainly a non-802.11 device - candidates include cordless phones, video cameras, microwave equipment, or radar systems triggering DFS events. The correct engineering response is systematic documentation: capture the time of occurrence, the specific frequency or frequency range, and the geographic location of the interference signature. This triangulation data enables correlation with physical devices present in the facility. Simply increasing transmit power (Option A) raises the noise floor for neighboring cells and worsens co-channel interference. Using WLC monitoring tools (Option B) is insufficient because the WLC cannot detect non-802.11 energy at Layer 1. Adjusting the channel plan (Option C) without fully characterizing the interferer is premature. Only Option D follows the correct Cisco survey methodology for Layer 1 analysis, leading to actionable AP placement adjustments. Reference: WLSD Study Guide - Wireless Site Survey Methodology, Layer 1 Spectrum Analysis, Interference Identification and Mitigation.
質問 # 80
A consultant must design a WLAN for a large campus with high AP density, 50-100 clients per cell, 5 Mbps throughput per client minimum, 5 GHz and 2.4 GHz coverage at -67 dBm, and no
802.11b clients. Which two WLAN design approaches meet the requirements? (Choose two.)
正解：B、D
解説：
Designing for 50-100 clients per cell with 5 Mbps minimum throughput and no 802.11b clients requires two critical optimizations. First, setting minimum mandatory data rates to 12-18 Mbps (Option A) removes legacy lower data rates from the AP's supported rate set. When 1, 2, 5.5, and
11 Mbps rates are disabled and 12 Mbps becomes the minimum mandatory rate, legacy 802.11b clients are excluded from the cell, airtime efficiency improves dramatically, and clients connecting at higher rates use less channel time per frame, increasing effective capacity. Second, Flexible Radio Assignment (FRA) for 2.4 GHz reduction (Option D) is critical in high-density environments.
FRA allows the WLC to dynamically reassign some 2.4 GHz radios to 5 GHz operation or monitor mode, reducing 2.4 GHz cell size and interference while increasing 5 GHz capacity in the high- density area.
質問 # 81
An engineer is finalizing the design for a WLAN dedicated to wireless VoIP handsets. Which setting should be applied to this WLAN, and why?
正解：B
解説：
Band Select works by suppressing 2.4 GHz probe responses to dual-band capable clients, deliberately withholding replies so the client is nudged toward discovering the 5 GHz radio instead. That suppression introduces delay into the probe and discovery process, which is harmless for a laptop associating once at the start of the day but damaging for a handset attempting to find a roam target while a call is in progress. Cisco's guidance is therefore to disable Band Select on voice WLANs and instead steer handsets to 5 GHz through client configuration or by not enabling the SSID on 2.4 GHz at all. Client Load Balancing should also be disabled on voice WLANs for the same class of reason - it rejects association attempts to encourage the client toward a different AP, which can block a roaming handset from joining the AP it actually needs. Passive Client mode addresses devices that do not send traffic until polled, such as certain industrial controllers, and is unrelated to handset roaming.
質問 # 82
Refer to the exhibit. A network engineer is designing a high availability SSO on a Cisco Catalyst 9800-40 WLC with multi-LAG network redundancy on two Catalyst 9300 switches. The LAG requirements are: * Each LAG must be connected to a single switch. * Different VLANs must be assigned to different LAGs. * The controller must learn the identity of partners that can support LAG capabilities in each port. * When any active LAG ports fail, a standby LAG port must provide redundancy. Which protocol must be used for the port channel on the interface to meet the design requirements?
正解：D
解説：
The design requirements specify a multi-LAG configuration where each LAG connects to a single switch, different VLANs are assigned to different LAGs, the controller must dynamically learn partner LAG capabilities per port, and standby ports provide redundancy upon active port failure. These requirements collectively point to IEEE 802.3ad LACP (Link Aggregation Control Protocol) as the correct protocol. LACP is the industry-standard IEEE protocol that enables dynamic negotiation of LAG membership between endpoints - the WLC and each Catalyst 9300 switch exchange LACP PDUs (LACPDUs) to discover port capabilities, negotiate bundle membership, and monitor link status. LACP supports active and passive port states where active ports initiate negotiation and passive ports respond, and it provides the standby port mechanism through its hot-standby capability for link redundancy within the bundle. The requirement to ' learn the identity of partners that can support LAG capabilities ' is the defining characteristic of LACP ' s standardized PDU exchange mechanism. PAgP (Option C) is a Cisco proprietary port aggregation protocol that, while functionally similar, is not the IEEE standard and is incompatible with non-Cisco equipment in mixed environments. OSPF (Option B) and BGP (Option D) are Layer 3 routing protocols entirely unrelated to port channel negotiation. Reference: WLSD Study Guide - Catalyst 9800 LAG Configuration, LACP IEEE 802.3ad, Multi-LAG High Availability Design.
質問 # 83
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