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Question 221. What controller utilization level does Cisco recommend as a planning target for Catalyst 9800

1. 100 percent
2. Around 80 percent
3. 25 percent
4. 40 percent

Correct Answer: 2. Around 80 percent

Explanation:

Cisco recommends planning Catalyst 9800 deployments at around 80 percent of the supported access point and client scale instead of designing continuously at the absolute platform maximum. This leaves operational headroom for temporary traffic peaks, client roaming bursts, authentication activity, interference processing, and future growth. Actual controller load depends on many factors beyond the simple number of access points and clients. Applications, roaming frequency, authentication mechanisms, and management functions can also affect controller resources. Designing with capacity headroom therefore improves scalability and reduces the risk of performance problems during unusually busy periods.

Question 222. How many APs does Cisco generally recommend per site tag for good Catalyst 9800 performance

1. 1000
2. 2000
3. 100
4. Around 500

Correct Answer: 4. Around 500

Explanation:

Cisco generally recommends limiting a Catalyst 9800 site tag to around 500 local mode access points whenever practical. Site tags influence how APs are distributed among internal wireless controller processes. Keeping the number of APs within a reasonable size helps distribute processing load and reduces the possibility that one internal process becomes overloaded. Platform specific maximum values can be higher, so 500 is a performance planning recommendation rather than an absolute system limit. Large deployments can use several site tags and distribute access points evenly among them while preserving logical roaming domains.

Question 223. Which APs should normally share the same site tag

1. APs in the same roaming domain
2. APs using different SSIDs only
3. APs on different continents
4. APs with different controller software

Correct Answer: 1. APs in the same roaming domain

Explanation:

Cisco recommends assigning the same site tag to access points that belong to the same roaming domain. A roaming domain is a logical collection of APs that share the same RF environment and broadcast the same wireless network where clients can reasonably move between APs. Grouping these APs under one site tag improves internal controller processing because the APs can be handled by the same wireless network control process. This reduces unnecessary communication between internal processes and can improve scalability, particularly in large Catalyst 9800 deployments with frequent client roaming.

Question 224. What determines AP distribution among Catalyst 9800 WNCd processes

1. Client IP address
2. Policy profile name
3. Site tag
4. DHCP lease time

Correct Answer: 3. Site tag

Explanation:

Catalyst 9800 distributes access points among its internal wireless network control processes according to site tags. Access points associated with the same site tag are managed by the same internal process. The mapping is established when the first AP associated with that site tag joins the controller. This is why Cisco recommends designing site tags carefully in large deployments. Proper distribution helps balance AP and client processing across available controller resources. Using multiple appropriately sized site tags can prevent one internal process from handling a disproportionate amount of wireless activity.

Question 225. What is the maximum AP scale listed for a Catalyst 9800 80 controller

1. 2000
2. 3000
3. 4000
4. 6000

Correct Answer: 4. 6000

Explanation:

Cisco lists support for up to 6000 access points on the Catalyst 9800 80 controller platform. This makes the platform suitable for very large campus and high density wireless environments. Designers should not automatically size the network to operate permanently at the theoretical platform maximum. Cisco recommends maintaining operational headroom and considering factors such as client density, authentication rates, roaming activity, application behavior, and other control plane processing demands. The maximum AP count therefore represents platform scale capability rather than a universal recommended design target for every deployment.

Question 226. What is the maximum client scale listed for a Catalyst 9800 80 controller

1. 32000
2. 64000
3. 10000
4. 16000

Correct Answer: 2. 64000

Explanation:

The Catalyst 9800 80 supports a maximum scale of 64000 wireless clients according to Cisco platform documentation. This client capacity makes it appropriate for large campuses and other environments with substantial wireless populations. Client count alone does not determine actual controller workload. Frequent authentication, rapid roaming, client probing, interference detection, multicast services, and application behavior can create significant additional control plane activity. Cisco therefore recommends retaining operational headroom instead of designing every controller to remain continuously at maximum scale. Capacity planning should consider expected peak usage and future growth.

Question 227. What is the maximum AP scale listed for a Catalyst 9800 40 controller

1. 2000
2. 500
3. 6000
4. 1000

Correct Answer: 1. 2000

Explanation:

Cisco lists a maximum scale of 2000 access points for the Catalyst 9800 40 wireless controller. This platform is commonly positioned for medium to large enterprise environments that require centralized wireless control. The number of supported APs is only one sizing factor. Designers should also evaluate client scale, traffic throughput, high availability, roaming patterns, authentication activity, and expected growth. Cisco recommends maintaining controller capacity headroom rather than operating continuously at the documented maximum. Appropriate sizing improves operational resilience during high activity periods and unexpected load spikes.

Question 228. What is the maximum client scale listed for a Catalyst 9800 40 controller

1. 64000
2. 10000
3. 32000
4. 4000

Correct Answer: 3. 32000

Explanation:

The Catalyst 9800 40 supports up to 32000 clients according to Cisco controller scale documentation. This figure represents the maximum platform client capacity under supported conditions. A practical enterprise design should include additional headroom because client behavior can greatly influence controller processing. A network containing frequent roaming, repeated authentication events, high probing activity, or complex wireless applications can generate more controller workload than a quieter network with the same client count. Designers should therefore combine platform limits with realistic usage estimates when selecting controller capacity.

Question 229. How much of the maximum client capacity per radio does Cisco recommend staying below for large public network planning

1. 90 percent
2. Well below 50 percent
3. 100 percent
4. 75 percent

Correct Answer: 2. Well below 50 percent

Explanation:

Cisco recommends planning client counts per radio well below 50 percent of the maximum supported radio capacity in large public wireless designs. Maximum association limits do not represent desirable operating targets because all clients share radio airtime and channel capacity. As more active devices use one radio, contention increases and the throughput available to individual users falls. Actual performance also depends on application demand, client capabilities, data rates, and traffic patterns. Capacity planning should therefore focus on expected user experience rather than simply determining whether the AP can technically accept additional associations.

Question 230. What maximum client count per radio does Cisco list for WiFi 6 APs in large public network guidance

1. 50
2. 100
3. 200
4. 400

Correct Answer: 4. 200

Explanation:

Cisco large public network guidance lists a maximum of 200 connected devices per radio for the referenced WiFi 6 access points. This value should not be interpreted as a recommended design density. Cisco advises keeping planned client counts well below half of the maximum radio capacity because wireless airtime is shared among associated devices. A radio with many active clients can experience contention and lower per user performance even though the AP remains within its technical association limit. Designers should calculate capacity using expected devices, applications, and activity rather than maximum association numbers alone.

Question 231. What maximum client count per radio does Cisco list for WiFi 6E APs in large public network guidance

1. 200
2. 100
3. 400
4. 800

Correct Answer: 3. 400

Explanation:

Cisco large public wireless guidance lists a maximum of 400 connected devices per radio for the referenced WiFi 6E access points. This does not mean a design should intentionally place 400 active users on every radio. Cisco recommends planning well below half the maximum radio association capacity. The amount of usable wireless capacity is shared among connected devices and is affected by client capabilities, traffic demand, channel conditions, and application types. Capacity calculations should therefore focus on expected active devices and required user throughput rather than using the maximum association limit as the design objective.

Question 232. What response code does aggressive client load balancing use to indicate an AP is busy

1. Code 17
2. Code 1
3. Code 200
4. Code 404

Correct Answer: 1. Code 17

Explanation:

Aggressive client load balancing can send an 802.11 association response containing status code 17 to indicate that the access point is busy. When another less busy AP is available, this response encourages the wireless client to attempt association elsewhere. The feature is intended to distribute wireless devices more evenly across nearby access points instead of allowing one AP to become excessively loaded. Because roaming and association decisions are client dependent, designers should use load balancing carefully and test important endpoint types, especially latency sensitive devices such as wireless phones.

Question 233. How many association denials can aggressive client load balancing be configured to send before allowing the next attempt

1. Five
2. Ten
3. Twenty
4. Fifty

Correct Answer: 4. Ten

Explanation:

Cisco aggressive client load balancing can be configured to deny client association attempts up to ten times. If the same client reaches the next attempt, it is allowed to connect rather than being rejected indefinitely. This behavior reduces the risk of permanently preventing a client from gaining wireless access when it does not select another AP after receiving busy responses. The denial value should be selected carefully because repeated association rejection can affect user experience and application connectivity. Cisco specifically notes that time sensitive clients may need to be excluded from load balancing behavior.

Question 234. Where is aggressive client load balancing not supported

1. Named site tags
2. RF profiles
3. Default site tag
4. WLAN configuration

Correct Answer: 3. Default site tag

Explanation:

Cisco states that aggressive client load balancing is not supported for access points joined under the default site tag. The feature operates with access points assigned to a named site tag. Site tag design is therefore important not only for controller process distribution and roaming optimization but also for feature availability. Cisco best practices generally recommend using custom site tags instead of placing large deployments under the default site tag. Properly designed site tags provide more predictable controller resource usage and support advanced functions such as client load balancing within the intended AP group.

Question 235. Across which AP group does aggressive client load balancing operate

1. APs on all controllers globally
2. APs within the same named site tag
3. APs on different mobility groups only
4. APs using different site tags

Correct Answer: 2. APs within the same named site tag

Explanation:

Aggressive client load balancing is supported among access points within the same named site tag. Cisco does not support the feature across APs belonging to different named site tags. When a client attempts to associate with a busier AP, the controller can compare load conditions and encourage the client toward a less busy AP within the supported group. Designers should therefore align site tag boundaries with physical areas where client load balancing makes operational sense. Site tag structure also affects internal controller process distribution, making it an important component of Catalyst 9800 scalability design.

Question 236. What happens to aggressive client load balancing when a FlexConnect AP enters standalone mode

1. It becomes mandatory
2. It doubles the client threshold
3. It moves to the anchor controller
4. It does not operate

Correct Answer: 4. It does not operate

Explanation:

Aggressive client load balancing does not operate when a FlexConnect access point is in standalone mode. In normal connected operation, the controller participates in the load balancing decision even though FlexConnect handles association behavior locally. When the AP loses controller connectivity and enters standalone operation, that controller based load balancing decision is no longer available. This illustrates an important branch design principle. Features that depend on centralized controller decisions may behave differently during WAN outages even though local client forwarding and other FlexConnect services continue operating.

Question 237. Which type of site tag does Cisco recommend instead of the default site tag

1. Custom site tag
2. Empty site tag
3. Guest site tag only
4. Temporary site tag

Correct Answer: 1. Custom site tag

Explanation:

Cisco recommends using custom site tags rather than relying on the default site tag, particularly in larger Catalyst 9800 environments. Custom site tags allow designers to group access points according to roaming domains and distribute AP processing among internal WNCd processes more effectively. Cisco recommends matching site tag boundaries with logical roaming domains and keeping AP counts per tag at appropriate levels. This design reduces the chance of one internal controller process becoming overloaded and provides clearer administrative organization. Site tag planning is therefore an important element of both wireless architecture and controller scalability.

Question 238. What should APs in the same roaming domain normally share

1. Different controller software
2. Different policy tags only
3. Different RF bands
4. The same site tag

Correct Answer: 4. The same site tag

Explanation:

Cisco recommends assigning APs within the same roaming domain to the same site tag. A roaming domain consists of access points that share the same RF environment and wireless network where clients can move between them. Placing these APs under the same site tag keeps related AP and client processing together within the Catalyst 9800 internal architecture. This can improve efficiency and reduce interprocess communication during normal roaming operations. Large buildings may still require multiple site tags when AP counts become too high, so designers must balance logical roaming relationships with controller scale recommendations.

Question 239. What does aggressive client load balancing try to prevent

1. AP overload
2. Controller certificate renewal
3. DFS operation
4. DHCP allocation

Correct Answer: 1. AP overload

Explanation:

Aggressive client load balancing attempts to distribute wireless clients across available access points so that one AP does not become excessively loaded while nearby APs have lower client counts. When the configured conditions are met, a busier AP can reject an association request with status code 17 and encourage the client to connect elsewhere. The feature can improve distribution in suitable environments, but the client still controls its association behavior. Designers should avoid relying on load balancing as a substitute for sufficient AP density, proper RF coverage, and sound capacity planning.

Question 240. Why does Cisco recommend leaving controller capacity headroom

1. To reduce AP antenna gain
2. To handle peaks and future growth
3. To disable roaming
4. To eliminate controller redundancy

Correct Answer: 3. To handle peaks and future growth

Explanation:

Wireless controller workload can change substantially during busy periods. Large numbers of clients may associate, authenticate, roam, probe, or use controller intensive services at the same time. Cisco therefore recommends avoiding designs that permanently operate a Catalyst 9800 at its absolute documented capacity. Maintaining headroom gives the controller resources to absorb temporary peaks and provides space for future expansion. Cisco commonly suggests using around 80 percent of the AP and client scale as an initial planning guideline. Actual sizing should still consider the specific applications and client behavior expected in the deployment.