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| Section | Weight | Objectives |
|---|---|---|
| Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Physical infrastructure requirements - Design wireless bridging (mesh) - Design radio management - Logical infrastructure requirements - Design for data, voice, video, location |
| Wireless Site Survey | 25% | - Predictive site survey - Collect design requirements and evaluate constraints - Layer 1 site survey analysis - Material attenuation and its design effects - Planning tools and network metrics evaluation - Post-deployment site survey - Pre-deployment site survey |
| Mobility | 25% | - Design mobility groups - Site Tags - Optimize client roaming - Validate mobility tunneling |
| WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
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15. Frage
An engineer is designing an outdoor mesh network for a container yard. Which two design rules apply to the mesh deployment? (Choose two.)
Antwort: B,C
Begründung:
In a Cisco mesh deployment, the Root AP (RAP) has a wired connection to the network and the Mesh APs (MAPs) connect back to it over a wireless backhaul, typically using the 5 GHz radio.
Cisco recommends limiting the mesh to no more than four hops from RAP to the furthest MAP (Option A); while more hops are technically possible, each additional hop increases latency, jitter, and convergence time after a link failure. Backhaul throughput is roughly halved with each hop (Option C) because a MAP that relays traffic must both receive and retransmit each frame on the same half-duplex radio channel, consuming airtime twice. This compounds down the chain, so an eight-hop design delivers negligible usable throughput at the far end. MAPs by definition have no wired uplink, and RAPs and their associated MAPs must share the same bridge group name to form the mesh tree.
16. Frage
An engineer must identify the network requirements for a company that has a main office and 10 branch offices. The network must be able to support data, voice, video, and location tracking.
Which two factors must be considered? (Choose two.)
Antwort: B,D
Begründung:
When designing a wireless network to support diverse services -- including data, voice, video, and location tracking -- across a distributed enterprise with a main office and 10 branch locations, the two primary design factors directly shaping the RF and capacity architecture are the number of wireless devices requiring access and the type of site where the survey will be performed. The device count (Option B) drives AP density, channel reuse planning, capacity modeling, and controller licensing requirements. Each service type -- particularly VoWLAN and video -- imposes strict per- client throughput and latency constraints that must be multiplied across the concurrent device population. The type of site (Option C) determines the survey approach, attenuation characteristics, coverage requirements, and antenna selection. A warehouse, hospital, or open- plan office each demands a fundamentally different RF design.
17. Frage
An engineer is designing a high-density WLAN that must support 100 concurrent users with 100 Mbps throughput consistently. The design allows for 20 Mbps per cell and per channel on the 5 GHz band. How many channels must the design use to provide 1 Mbps per user prior to RF overhead?
Antwort: C
Begründung:
This question requires straightforward wireless capacity engineering calculation. The total throughput requirement is 100 users ?1 Mbps per user = 100 Mbps aggregate. Each channel in the design can support 20 Mbps of usable throughput -- this is the per-cell, per-channel allocation defined in the design parameters, representing usable throughput prior to RF overhead as stated in the question. The number of channels required is: total required throughput divided by throughput per channel = 100 Mbps ?20 Mbps per channel = 5 channels. In practice, each channel corresponds to a non-overlapping frequency assignment in the 5 GHz band. With 5 channels and 20 Mbps per channel, the design provides exactly 100 Mbps of aggregate capacity for 100 concurrent users at 1 Mbps each. This calculation methodology is foundational to Cisco's high-density WLAN design approach, where the number of spatial streams, channel allocations, and AP placement are all derived from the per-user throughput requirement multiplied by the concurrent user population.
18. Frage
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?
Antwort: A
Begründung:
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.
19. Frage
A customer is migrating from a legacy Cisco AireOS WLC to a new Cisco 9800 IOS XE WLC with Cisco
9100 APs. The new APs must associate to the Catalyst 9800 WLC, and wireless clients must seamlessly roam between the old and new WLCs even during SSO. The new Catalyst 9800 WLC deployment is configured to use SSO. Which command must be added to meet the requirements?
Antwort: C
Begründung:
In a mixed deployment where a Cisco Catalyst 9800 IOS XE WLC operating in SSO is required to establish a mobility peer relationship with a legacy AireOS WLC, the critical configuration requirement is that the 9800 SSO pair presents a single, consistent mobility MAC address to all peer WLCs. When the 9800 is in SSO mode, the active and standby controllers function as a single logical entity, but AireOS WLCs identify mobility peers by MAC address. If the MAC address changes during an SSO switchover, the AireOS peer will detect the change and tear down the mobility tunnel, disrupting inter-controller client roaming. The command ' wireless mobility mac-address < MAC > ' configures a static, persistent mobility MAC address on the 9800 SSO pair that remains constant regardless of which physical unit is active. This ensures the AireOS WLC always identifies the 9800 pair by the same MAC address, maintaining the mobility tunnel and enabling seamless client roaming. Option A configures the HA interface for SSO synchronization but not for AireOS mobility interoperability. Option B sets a default gateway. Option D enables management gateway failover, unrelated to mobility peer identification. Reference: WLSD Study Guide - IOS XE WLC SSO Configuration, AireOS to 9800 Migration, Mobility Peer MAC Address Management.
20. Frage
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