Download CWNP CWNA-108 Sample Questions [Mar-2024]
Real CWNA-108 Exam Questions and Answers FREE
NEW QUESTION # 60
A client STA must choose the best AP for connectivity. As part of the evaluation, it must verify compatible data rates. What can the client STA use to verify that an AP supports the same data rates that it supports?
- A. Authentication frames transmitted by the other client STAs
- B. Data frames sent between the AP and current clients STAs
- C. Probe request frames transmitted by other client STAs
- D. Beacon frames transmitted by the AP
Answer: D
Explanation:
Explanation
The client STA can use Beacon frames transmitted by the AP to verify that an AP supports the same data rates that it supports. Beacon frames are management frames that are periodically broadcasted by the APs to announce their presence, capabilities, and parameters. One of the information elements contained in the Beacon frames is the Supported Rates or Extended Supported Rates, which lists the data rates that the AP can use for communication. The client STA can compare its own data rates with those advertised by the AP to determine if they are compatible. Data frames, authentication frames, and probe request frames do not contain information about data rates. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 133; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 123.
NEW QUESTION # 61
What is appended to the end of each 802.11 data frame after the payload?
- A. Preamble
- B. MAC header
- C. PHY header
- D. FCS
Answer: D
Explanation:
Explanation
The FCS (Frame Check Sequence) is appended to the end of each 802.11 data frame after the payload. The FCS is a 4-byte field that contains a CRC-32 (Cyclic Redundancy Check) value that is calculated based on the contents of the MAC header and the payload of the frame. The FCS is used by the receiver to verify the integrity of the frame and to detect any errors or corruption that may have occurred during transmission. If the FCS does not match with the expected value, the frame is discarded by the receiver. References: , Chapter 4, page 139; , Section 4.2
NEW QUESTION # 62
What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?
- A. An IBSS is used instead of a BSS.
- B. Multiple Aps have been loaded with the same configuration from an image file.
- C. An SCA network is in use.
- D. A single AP supports multiple BSSs with different SSIDs
Answer: A
Explanation:
Ad-Hoc Networks Do Not Have a MAC Address
Every BSS needs a BSSID, and using the access point's MAC address works fine most of the time.
However, an ad-hoc network, a network that forwards traffic from node to node, has no access point.
When a BSS does not have a physical access point, in an ad-hoc network for example, the network generates a 48-bit string of numbers that looks and functions just like a MAC address, and that BSSID goes in every packet.
https://www.juniper.net/documentation/en_US/junos-space-
apps/networkdirector3.0/topics/concept/wireless-ssid-bssid-essid.html#jd0e46
https://www.oreilly.com/library/view/80211-wireless-networks/0596100523/ch04.html
NEW QUESTION # 63
What factor does not influence the distance at which an RF signal can be effectively received?
- A. Receiving station's radio sensitivity
- B. Receiving station's output power
- C. Transmitting station's output power
- D. Free Space Path Loss
Answer: B
Explanation:
Explanation
The distance at which an RF signal can be effectively received depends on several factors, such as the transmitting station's output power, the free space path loss, the receiving station's radio sensitivity, and the environmental noise and interference. However, the receiving station's output power does not influence this distance, because it only affects how well the receiving station can transmit signals back to the transmitting station. The output power of the receiving station is irrelevant for receiving signals from the transmitting station12. References: CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page
79; CWNA-108 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 74.
NEW QUESTION # 64
What term correctly completes the following sentence?
802.11a/b/g used a mandatory 800ns guard interval. 802.11n introduced an optional short 400ns guard interval. Guard intervals (GI) are necessary in OFDM to reduce the likelihood of interference between two consecutive ____________.
- A. Packets
- B. Bytes
- C. Bits
- D. Segments
- E. Frames
- F. Symbols
Answer: F
NEW QUESTION # 65
You are troubleshooting a controller-based AP that is unable to locate the controller. DHCP is not use and the controller is located at 10.10.10.81/24 while the AP is on the 10.10.16.0/24 network. What should be inspected to verify proper configuration?
- A. DNS
- B. AP hosts file
- C. NTP
- D. BOOTH
Answer: A
Explanation:
Explanation
What should be inspected to verify proper configuration is DNS. DNS stands for Domain Name System and is a service that resolves hostnames to IP addresses. In a controller-based AP deployment, DNS can be used to help the AP locate the controller by using a predefined hostname such as CISCO-CAPWAP-CONTROLLER or aruba-master. The AP sends a DNS query for this hostname and receives an IP address of the controller as a response. Therefore, if DNS is not configured properly or if there is no DNS entry for the controller hostname, the AP may not be able to locate the controller. NTP, BOOTP, and AP hosts file are not relevant for this scenario. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 374; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 364.
NEW QUESTION # 66
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
- A. 104 ms
- B. 800 ns
- C. 400 ns
- D. 10 ms
Answer: C
Explanation:
Explanation
The short guard interval is an optional feature of 802.11n and 802.11ac that reduces the time between OFDM symbols from 800 ns to 400 ns. This can increase the data rate by about 11%, but also requires more precise timing and synchronization between the transmitter and the receiver. The short guard interval is only used when both the AP and the client support it and agree to use it . References: [CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 163; [CWNA-108 Study Guide], Chapter 4:
Radio Frequency Signal and Antenna Concepts, page 157.
NEW QUESTION # 67
Lynne runs a small hotel, and as a value added service for her customers she has implemented a Wi-Fi hot-spot. Lynne has read news articles about how hackers wait at hot- spots trying to take advantage of unsuspecting users. She wants to avoid this problem at her hotel.
What is an efficient and practical step that Lynne can take to decrease the likelihood of active attacks on her customers' wireless computers?
- A. Implement Network Access Control (NAC) and require antivirus and firewall software along with OS patches.
- B. Implement an SSL VPN in the WLAN controller that initiates after HTTPS login.
- C. Enable station-to-station traffic blocking by the access points in the hotel.
- D. Require EAP-FAST authentication and provide customers with a username/password on their receipt.
Answer: D
NEW QUESTION # 68
What factors does not influence the distance at which an RF signal can be effectively received?
- A. Receiving station's output power
- B. Transmitting station's output power
- C. Receiving station's radio sensitivity
- D. Free Space Path Loss
Answer: B
NEW QUESTION # 69
ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous)
802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.1X Authenticator?
- A. The root bridge
- B. All non-root bridges
- C. The RADIUS server
- D. The Ethernet switch
Answer: A
NEW QUESTION # 70
An IEEE 802.11 amendment is in the draft state. What impact does this draft amendment have on the 802.11 standard?
- A. No impact: Draft amendments do not become part of the standard until a working group is formed.
- B. The standard is changed to reflect the new capabilities as soon as amendment enters the draft stage.
- C. Devices will be released based on the draft amendment and the draft amendment features are part of the standard.
- D. No impact: Until an amendment is ratified, it does not become part of the standard.
Answer: D
NEW QUESTION # 71
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
- A. 104 ms
- B. 800 ns
- C. 400 ns
- D. 10 ms
Answer: C
NEW QUESTION # 72
When a client moves to a new BSS within an ESS, what step is a part of the 802.11 reassociation process?
- A. The client station transmits a Reassociation Request frame to its currentaccess point.
- B. The new access point transmits a Reassociation Response to the client station with a status value.
- C. The current access point triggers the client's reassociation service.
- D. The current access point informs the IP gateway of the reassociation.
Answer: B
NEW QUESTION # 73
Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?
- A. RADIUS
- B. DHCP
- C. LDAP
- D. DNS
Answer: B
NEW QUESTION # 74
A Wi-Fi Alliance interoperability certificate indicates that a device is a/b/g/n certified. It further indicates one transmit and receive spatial stream for both the 2.4 GHz and 5.0 GHz bands. It further indicates support for both WPA and WPA2 Enterprise and Personal. Finally, it indicates support for EAP-TLS, EAP-TTLS/MSCHAPv2, PEAPv0/EAP-MSCHAPv2 and PEAPv1/EAP- GTC.
Which one of the following statements is false?
- A. This client device supports X.509 certificates for EAP authentication.
- B. This client device supports the ERP, OFDM, and HT physical layer specifications.
- C. This client device supports both TKIP and CCMP cipher suites.
- D. 300 Mbps is the maximum supported data rate for this device.
- E. This client device supports protection mechanisms such as RTS/CTS and/or CTS-to-Self.
Answer: D
NEW QUESTION # 75
Your manager asked you to locate a solution that allows for centralized monitoring of WLAN performance over time. He wants a single pane of glass for administration and monitoring of the solution. What do you recommend?
- A. Overlay WLAN monitoring solution
- B. AP-based spectrum analysis
- C. Laptop-based protocol analyzers
- D. Laptop-based spectrum analyzers
Answer: A
NEW QUESTION # 76
When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?
- A. For each probe request frame, only one AP may reply with a probe response.
- B. Each AP responds in turn after preparing a probe response and winning contention.
- C. After waiting a SIFS, all APs reply at the same time with a probe response.
- D. Each AP checks with the DHCP server to see if it can respond and then acts accordingly.
Answer: B
Explanation:
Explanation
A probe request frame is a management frame that is sent by a client station to discover available wireless networks in its vicinity. A probe request can be either unicast or broadcast, depending on whether it specifies a particular SSID (Service Set Identifier) or a wildcard SSID. A broadcast probe request with a wildcard SSID is used to solicit responses from all APs within range, regardless of their SSIDs. Each AP that receives a broadcast probe request prepares a probe response frame that contains information about its network, such as SSID, supported rates, channel, security, etc. However, before sending the probe response, each AP must contend for the medium using the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol, which is the basic access method for 802.11 WLANs. This means that each AP must sense the channel for a DIFS (Distributed Interframe Space) interval, which is longer than a SIFS interval, and then generate a random backoff time before transmitting. This reduces the probability of collisions and ensures fair access to the medium among multiple APs. Therefore, each AP responds in turn after preparing a probe response and winning contention . References: [CWNA-109 Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 215; [CWNA-108 Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 209;
[CWNA-109 Study Guide], Chapter 6: Wireless LAN Devices and Topologies, page 255.
NEW QUESTION # 77
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