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| Section | Objectives |
|---|---|
| Cisco Wireless Architecture | - Wireless LAN Controller (WLC) concepts - Lightweight Access Point (LAP) operation |
| Wireless Fundamentals | - 802.11 standards overview - RF principles and radio frequency behavior - WLAN components and architecture basics |
| Troubleshooting and Monitoring | - Performance monitoring and diagnostics - Wireless connectivity troubleshooting |
| Wireless Deployment and Design | - Channel planning and interference mitigation - Site survey and RF planning |
| Mobility and Roaming | - Mobility groups and handoff mechanisms - Client roaming behavior |
| Wireless Security | - 802.1X and authentication methods - WPA/WPA2/WPA3 security mechanisms |
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NEW QUESTION # 118
Refer to the exhibit. A network administrator is working on a WLC to enable user access for contractor desktops using WPA2-Enterprise using EAP-TTLS. The administrator verified the external authentication configuration and now must test network connectivity. Which code snippet must be added to the box in the code to complete the configuration on the WLC that supports authentication with an external server?
Answer: D
Explanation:
The missing command must create the RADIUS server group context before the existing server name external-radius command can bind the defined RADIUS server into that group. Cisco's Catalyst 9800 802.1X configuration workflow shows the exact CLI sequence: define the RADIUS server, then enter aaa group server radius <radius-grp-name>, then add server name <radius- server-name>. The Catalyst 9800 configuration guide likewise states that the RADIUS server- group identification is created with aaa group server radius server-group, followed by the server name assignment.
In this exhibit, external-radius is already declared under radius server, and aaa authentication dot1x CLIENT_GROUP group RADIUS-GRP already points the 802.1X method list to the server group named RADIUS-GRP. Therefore, the box must contain aaa group server radius RADIUS- GRP so that server name external-radius is syntactically valid and functionally associates the external server with the group. Cisco also identifies dot1x authentication lists as the AAA method type used for 802.1X SSIDs, with "group" directing authentication to an external RADIUS server.
NEW QUESTION # 119
How does MIMO operate during wireless transmission?
Answer: B
Explanation:
MIMO, or Multiple-Input Multiple-Output, is a core 802.11n and later wireless technology that uses multiple transmit and receive radio chains and antennas to improve wireless performance. Cisco's Wireless RF Reference Guide explains that IEEE 802.11n introduced MIMO, replacing the older single-radio SISO model with multiple radios, each using its own antenna, to increase data rates and improve reception in multipath environments. Cisco also notes that weak or distorted multipath signals can be received by more than one radio and reconstructed, improving decode quality and reliability.
This directly supports option A: MIMO exploits multiple RF paths rather than treating multipath as purely destructive. Depending on implementation, MIMO can use spatial diversity, maximal ratio combining, and spatial streams to increase throughput, improve signal-to-noise ratio, reduce retries, and make more efficient use of airtime. Cisco describes spatial stream notation such as 4x4:4 as four transmitters, four receivers, and four spatial streams. Option B describes frequency hopping, not MIMO. Option C is not a MIMO function.
Option D is the opposite of MIMO because MIMO deliberately uses multiple antennas and radio paths.
Reference topics:802.11 Technology Fundamentals - MIMO, spatial streams, multipath, SISO versus MIMO, and 802.11n/ac/ax PHY enhancements.
NEW QUESTION # 120
A persistent network issue is impacting connectivity for workstations in a training lab when connecting to a lab SSID. Wireless logs show clients never receive a DHCP offer when trying to obtain an IP address. The APs are operating in Local mode. Network monitoring systems indicate optimal signal quality and radio performance, VLAN assignments for the affected SSID have been configured, and all clients are affected.
Which action resolves the issue?
Answer: A
Explanation:
The fault domain is DHCP forwarding, not RF, client-side addressing, or AP discovery. Cisco explains that when a wireless client associates, it sends a DHCP Discover broadcast, and depending on AP mode, that traffic is either forwarded through the WLC or passed to the next hop. Cisco further states that if no DHCP server exists in the client's local Layer 2 domain, the router or SVI for the client VLAN must forward DHCP discovery traffic using an IP helper address.
Because the APs are inLocal mode, client traffic is centrally switched through CAPWAP to the WLC, where the client VLAN/SVI path must correctly relay DHCP toward the DHCP server. Cisco's Catalyst 9800 DHCP configuration guide shows DHCP relay configuration under the client VLAN SVI by entering the IPv4 helper address, and the CLI example usesip helper-address < ip-address > to forward UDP broadcasts such as DHCP requests.
Option C resolves the issue because all clients are affected and none receive a DHCP offer, indicating the DHCP Discover is not reaching the DHCP server or the offer is not returning through the relay path. DHCP option 43 is for AP controller discovery, not client DHCP addressing. Reference topics:DHCP relay, Local mode AP forwarding, Catalyst 9800 client VLANs, and wireless client IP assignment.
NEW QUESTION # 121
What is the time taken for an RF signal to travel from the transmitter to the receiver known as?
Answer: C
Explanation:
In RF communications, propagation delay refers to the finite time required for a signal to travel from the transmitter to the receiver over a given medium. This delay depends on the distance between the endpoints and the speed at which electromagnetic waves propagate through the medium, typically close to the speed of light in air (approximately 3 ?10 m/s). Propagation delay is fundamental in calculating network latency, timing synchronization in protocols, and designing wireless coverage, especially in large-scale enterprise networks.
NEW QUESTION # 122
Users report slowness on the network, and it is suspected that certain applications are consuming all the bandwidth. A network engineer must enable the NBAR protocol to improve wireless client traffic visibility and provide advanced, granular, application classification, and analytics. How should the network engineer configure NBAR on a 9800 WLC?
Answer: C
Explanation:
The correct configuration approach is to enable Application Visibility and Control on the policy profile. On the Catalyst 9800, WLANs are not configured as isolated monolithic objects; the WLAN profile is mapped to a policy profile through a policy tag, and many client traffic services are applied from that policy profile. Cisco defines AVC as the wireless feature set that identifies and monitors applications using DPI, creates rules to manage application bandwidth and usage, and integrates with Flexible NetFlow for per-application or per-protocol statistics. Cisco further states that AVC benefits from NBAR running on the AP or controller, and that the NBAR2 engine analyzes and recognizes traffic flows.
Operationally, Cisco's 9800 AVC guide shows that AVC is enabled by navigating to Configuration > Services > Application Visibility and selecting the relevant Policy Profile. It also shows the CLI form under the policy profile: wireless profile policy AVC_testing followed by ip nbar protocol-discovery, with verification showing NBAR Protocol Discovery: Enabled. Options A and B are incorrect because the feature is not enabled directly on the WLAN. Option C is generic and incomplete; the Cisco feature construct is AVC.
NEW QUESTION # 123
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