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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Mobility | 25% | - Validate mobility tunneling - Site Tags - Optimize client roaming - Design mobility groups |
| Topic 2: Wired and Wireless Infrastructure | 30% | - Physical infrastructure requirements - Design wireless bridging (mesh) - Logical infrastructure requirements - Design high-density wireless networks - Design for data, voice, video, location - Design radio management |
| Topic 3: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Topic 4: Wireless Site Survey | 25% | - Post-deployment site survey - Material attenuation and its design effects - Layer 1 site survey analysis - Predictive site survey - Collect design requirements and evaluate constraints - Pre-deployment site survey - Planning tools and network metrics evaluation |
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問題 #67
What happens to an AP when a flex profile name is changed in a site tag?
答案：D
解題說明：
On the Cisco Catalyst 9800 IOS XE WLC platform, the tag-based configuration model uses site tags to associate APs with specific profiles including a flex profile and an AP join profile. The site tag is a fundamental binding element -- when any component of a site tag is modified, including renaming the flex profile associated with that tag, the WLC treats this as a material configuration change requiring the AP to re-evaluate its operational parameters. Specifically, the AP must disconnect its existing DTLS (Datagram Transport Layer Security) control plane tunnel to the WLC and re-establish it. This DTLS session disconnect and rejoin cycle is equivalent to a full AP rejoin: CAPWAP discovery, DTLS handshake, join request, configuration download, and image verification. Client service is interrupted on the affected AP during this process.
問題 #68
What happens to an AP when a flex profile name is changed in a site tag?
答案：D
解題說明：
On the Cisco Catalyst 9800 IOS XE WLC platform, the tag-based configuration model uses site tags to associate APs with specific profiles including a flex profile and an AP join profile. The site tag is a fundamental binding element - when any component of a site tag is modified, including renaming the flex profile associated with that tag, the WLC treats this as a material configuration change requiring the AP to re- evaluate its operational parameters. Specifically, the AP must disconnect its existing DTLS (Datagram Transport Layer Security) control plane tunnel to the WLC and re-establish it. This DTLS session disconnect and rejoin cycle is equivalent to a full AP rejoin: CAPWAP discovery, DTLS handshake, join request, configuration download, and image verification. Client service is interrupted on the affected AP during this process. Firmware updates (Option A) occur via a separate image download process. Temporary SSID disable (Option B) is not a defined behavior for profile name changes. Switching to a backup controller (Option C) requires AP failover conditions, not configuration changes. Understanding the disruptive nature of site tag modifications is essential for change management in production 9800 deployments. Reference: WLSD Study Guide - Catalyst 9800 Tag-Based Configuration Model, Site Tag Architecture, Flex Profile and AP Join Profile Management.
問題 #69
A wireless engineer is using Ekahau Site Survey to validate that an existing wireless network is operating as expected. A Cisco CleanAir AP is used for Layer 1 survey by using Metageek Chanalyzer only on the current operating channel. Which operating mode is configured for the Cisco CleanAir AP?
答案：D
解題說明：
When using Metageek Chanalyzer in conjunction with a Cisco CleanAir-capable AP for Layer 1 spectrum analysis, the AP must be configured in SE-Connect mode (Spectrum Expert Connect).
SE- Connect mode enables the AP's CleanAir radio to operate as a dedicated spectrum analyzer, feeding raw spectrum data to the connected Chanalyzer software for visualization and analysis.
In this mode, the AP does not serve any Wi-Fi clients and instead focuses all radio resources on spectrum scanning. Metageek Chanalyzer uses the SE-Connect mode specifically to receive the CleanAir ASIC's spectrum analysis data.
問題 #70
An enterprise network administrator is asked to set up an experimental WLAN for a collaboration project with a local service provider. The WLAN must be anchored to a WLC in the service provider data center using legacy mobility mode. After the configurations are completed on the WLCs and the firewalls in the path, the data path mobility tunnel is failing to come up. What should be performed by the administrator to debug the issue?
答案：C
解題說明：
When a data path mobility tunnel fails to come up between WLCs, one of the key troubleshooting steps is to verify whether the necessary ports are open through firewalls in the path. Cisco AireOS mobility tunnels use UDP port 16666 for mobility control traffic and IP Protocol 97 (EtherIP) for mobility data traffic in legacy mode. Establishing a Telnet connection from a local PC to the firewall on port 16666 tests whether the control path port is reachable and not being blocked by the firewall. If the Telnet connection fails, it confirms that the firewall is blocking port
16666, which would prevent the mobility control tunnel from establishing -- a prerequisite for the data tunnel. While a Telnet test to port 16666 specifically tests the control path, in practice this is the first verification performed when the data path cannot establish (since the data path depends on the control path being operational). IP Protocol 97 cannot be tested via Telnet (which is TCP).
問題 #71
A company has three Cisco WLCs that are joined as a mobility group. Mobility multicast messaging is enabled. All the WLCs in the mobility group communicate via a multicast. Which configuration must be identical between the three WLCs to validate communication?
答案：C
解題說明：
When Cisco WLCs are configured to use multicast for mobility group communications, all WLCs participating in the same mobility group must be configured with an identical multicast group IP address. The mobility multicast mode allows a WLC to send a single multicast frame received simultaneously by all other WLCs in the group, rather than sending individual unicast copies to each peer. For this to function correctly, every WLC in the group must join the same IP multicast group address, and the underlying network infrastructure must be configured to support IP multicast routing or IGMP snooping for that specific group address. If any WLC is configured with a different multicast IP address, it will join a different multicast group and will not receive mobility messages from the other WLCs, effectively isolating it from the group ' s communication plane. Service port IP addresses (Option A) are unique per controller. Interface IDs (Option B) are locally significant identifiers. Management IP addresses (Option C) are unique per WLC and identify each peer in unicast configurations. Reference: WLSD Study Guide - Mobility Group Configuration, Multicast Mobility Messaging, WLC Peer Communication.
問題 #72
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