CCNA Exploration 3 Chapter 7 Exam Answers

1. Wireless users on a network complain about poor performance within a small area of a room. Moving away from this area in any direction improves performance dramatically. What is the first step in designing a solution to this problem?

This might be RF channel overlap, so the technician should verify the channels in use on each wireless access point and change to non-overlapping channels.

The RF power settings might be set too low on the wireless access points servicing the room. Increase the RF output power on all wireless access points.

Install a new wireless access point in this center area to provide coverage.

Verify that the wireless access points have sufficient in-line power and connectivity to the wired network.

 

2. What procedure can prevent man-in-the-middle attacks?

Force all devices on a WLAN to authenticate and monitor for any unknown devices.

Enable access points to send an SSID to each device wanting to use the network.

Configure MAC filtering on all authorized access points.

Disable SSID broadcasts.

 

3. Which two conditions have favored adoption of 802.11g over 802.11a? (Choose two.)

802.11a suffers from a shorter range than 802.11g.

The 2.4 GHz frequency band is not as crowded as the 5 GHz band.

802.11a is more susceptible to RF interference from common commercial items.

802.11a uses a more expensive modulation technique than 802.11g.

802.11g is backward compatible with 802.11b, but 802.11a is not.

 

4. Which access method does a wireless access point use to allow for multiple user connectivity and distributed access?

CSMA/CD

token passing

CSMA/CA

polling

 

5.

CCNAExploration3Chapter7ExamAnswers thumb CCNA Exploration 3 Chapter 7 Exam Answers

Refer to the exhibit. When configuring the wireless access point, which setting does the network administrator use to configure the unique identifier that client devices use to distinguish this wireless network from others?

Network Mode

Network Name (SSID)

Radio Band

Wide Channel

Standard Channel

 

6. What wireless security feature allows a network administrator to configure an access point with wireless NIC unique identifiers so that only these NICs can connect to the wireless network?

authentication

SSID broadcasting

MAC address filtering

EAP (Extensible Authentication Protocol)

Radius (Remote Authentication Dial-In User Service)

 

7. Which three devices do many wireless routers incorporate? (Choose three.)

gateway for connecting to other network infrastructures

built-in Ethernet switch

network management station

VTP server

wireless access point

VPN concentrator

 

8. What will a wireless client transmit to discover the available WLAN networks?

beacon

password

probe request

association request

 

9. Which two statements concerning network security are accurate? (Choose two.)

802.11i uses 3DES for encryption.

Open authentication uses no client or AP verification.

The 802.11i protocol is functionally identical to WPA.

802.11i incorporates a RADIUS server for enterprise authentication.

A wireless client first associates with an AP and then authenticates for network access.

 

10. What occurs when a rogue access point is added to a WLAN?

Authorized access points can transmit excess traffic to rogue access points to help alleviate congestion.

Unauthorized users can gain access to internal servers, thus causing a security hole.

All traffic that uses the same channel as the rogue access point will be encrypted.

All traffic that uses the same channel as the rogue access point will be required to authenticate.

 

11. Which major problem does CSMA/CA overcome in wireless networks?

bandwidth saturation

privacy concerns

media contention

device interoperability

 

12. Which installation method will allow connectivity for a new wireless network?

set up WEP on the access point only

set up open access on both the access point and each device connected to it

set up full encryption on the access point while leaving each device connected to the network open

set up full encryption on each device of the WLAN while leaving the access point settings open

 

13. Which function is provided by a wireless access point?

dynamically assigns an IP address to the host

provides local DHCP services

converts data from 802.11 to 802.3 frame encapsulation

provides a gateway for connecting to other networks

 

14. Which network design process identifies where to place access points?

site survey

risk assessment

scalability design

network protocol analysis

 

15. Why is security so important in wireless networks?

Wireless networks are typically slower than wired networks.

Televisions and other devices can interfere with wireless signals.

Wireless networks broadcast data over a medium that allows easy access.

Environmental factors such as thunderstorms can affect wireless networks.

 

16. Which wireless technology standard provides the most compatibility with older wireless standards, but has greater performance?

802.11a

802.11b

802.11g

802.11n

 

17. Which two statements characterize wireless network security? (Choose two.)

A rogue access point represents a security risk for the local network.

Wireless networks offer the same security features as wired networks.

Using encryption prevents unauthorized clients from associating with an access point.

An attacker needs physical access to at least one network device to launch an attack.

With SSID broadcast disabled, an attacker must sniff the SSID before being able to connect.

 

18. What purpose does authentication serve in a WLAN?

converts clear text data before transmission

indicates which channel the data should flow on

determines that the correct host is utilizing the network

allows the host to choose which channel to use

 

19. Which two statements are true regarding wireless security? (Choose two.)

MAC address filtering prevents the contents of wireless frames from being viewable.

Providing a wireless client with the network key allows an available network to be visible.

Disabling an access point from broadcasting the SSID prevents the access point from being discovered.

Default SSIDs on specific manufacturer APs are generally known and may permit hostile wireless connections.

Manually adding a network and setting the known SSID on a wireless client makes the network visible even if the SSID is not being broadcast.

 

20. Why is security so important in wireless networks?

Wireless networks are typically slower than wired networks.

Televisions and other devices can interfere with wireless signals.

Wireless networks broadcast data over a medium that allows easy access.

Environmental factors such as thunderstorms can affect wireless networks.

 

21. In a WLAN network, why should wireless access points be implemented with each access point using a different channel?

to keep users segregated on separate subnets

to control the amount of bandwidth that is utilized

to keep signals from interfering with each other

to keep traffic secure

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4 Comments

  1. NS says:

    Also need to know:

    SSID cannot exceed 32 characters.

    What does a wireless access point use to allow WLAN clients to learn which networks are available in a given area?
    beacon

    A network administrator is deploying three 2.4 GHz access points for the exhibit area of a large car dealer facility. What channel selection can be used on the three access points to avoid signal interference?
    channels 1, 6, 11

    Q)A network administrator is designing the wireless network for a law office. The security policy requires that the access to the wireless network must be authenticated with the credentials of employees. The administrator decides to use the PSK2 Enterprise authentication method. Which server is a requirement to deploy PSK2 Enterprise?
    RADIUS

    Q)On a wireless network in a corporate environment that is using the CSMA/CA access method, how is the successful transmission of data packets by client stations indicated?
    The access point sends an acknowledgment to the sending client station that data has been received.

  2. need_help says:

    Which statement is true about the SSID configuration of a wireless access point?
    -The SSID is not case-sensitive.
    **-The SSID cannot exceed 32 characters.**
    -An SSID string cannot contain a space.
    **-Turning off SSID broadcasting makes the wireless network inaccessible**

    Which is the true answer?

    ** The SSID cannot exceed 32 characters.**

    ** Turning off SSID broadcasting makes the wireless network inaccessible**

    1. Heres Help says:

      ANSWER=The SSID cannot exceed 32 characters.

  3. Osisiogu Ukachi says:

    The answer is the second option i.e. “Turning off SSID broadcasting makes the wireless network inaccessible.”

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