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Objective 5.5
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Plan Security for Wireless Networks
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Objective 5.5 Questions 1.
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Which of the following protocol standards defines the mechanism that Windows XP and Windows Server 2003 use to authenticate and authorize wireless network clients
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A. IEEE 802.11a B. IEEE 802.11b C. IEEE 802.1X D. WEP
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You are adding wireless network clients to your Ethernet network, in the form of laptop computers that will be deployed to the sales staff. To secure the wireless connec tions, you intend to use 802.1X and WEP. The laptops are also equipped with card readers, and you plan to issue smart cards to the salespeople. Which of the following authentication protocols must you use to support this security solution
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A. PEAP-MS-CHAP v2
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B. RADIUS
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C. RC4
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D. EAP-TLS
You are a network consultant who has been called in to troubleshoot a wireless networking problem. The company has a large wireless presence, with multiple access points scattered throughout a building. The access points are located so as to provide an unbroken field of coverage throughout the building, but in practice this has proven not to be so. When a wireless computer moves out of the transmission range of its native access point, it moves into the range of another access point, but it cannot con nect. No matter which access point the computer starts at, it cannot connect to any of the other access points on the network. Which of the following reasons could possibly explain why this is happening (Choose all that apply.)
A. The wireless devices are configured to use Shared Key authentication. B. The construction of the building is inhibiting the wireless transmissions. C. The Wireless Network (IEEE 802.11) policy does not have the correct entries in the
Preferred Networks list.
D. The wireless devices are configured to use certificates for authentication, and the
certificates are configured incorrectly.
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Planning and Maintaining Network Security (5.0)
You have recently installed a WLAN access point on your network and equipped a number of laptop computers with wireless network interface adapters. You want all the wireless clients to be able to connect only to the access point, but not directly to each other, so that your security infrastructure will remain in effect. Which of the following steps can you use to limit the clients connectivity in this way
A. Configure the wireless devices to use IEEE 802.1X and authenticate using the EAP
TLS protocol with smart cards.
B. Configure the wireless devices to use Open System authentication. C. Create a Wireless Network (IEEE 802.11) policy, configure it to allow ad hoc net-
working only, and apply it to the computers.
D. Create a Wireless Network (IEEE 802.11) policy, configure it to allow infrastructure
networking only, and apply it to the computers.
Objective 5.5
Plan Security for Wireless Networks
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Objective 5.5 Answers 1.
Correct Answers: C
A. Incorrect: The IEEE 802.11a standard defines a physical layer implementation
that transmits signals at 5 gigahertz (GHz) and sends data at up to 54 Mbps using Orthogonal Frequency Division Multiplexing (OFDM). IEEE 802.11a is not used to authenticate and authorize wireless clients.
B. Incorrect: The IEEE 802.11b standard defines a physical layer implementation
that transmits signals at 2.4 GHz and sends data at up to 11 Mbps using direct sequence spread spectrum modulation. IEEE 802.11b is not used to authenticate and authorize wireless clients.
C. Correct: IEEE 802.1X is a standard for authentication for wired Ethernet networks
and wireless 802.11 networks. Windows XP and Windows Server 2003 can use IEEE 802.1X in conjunction with a RADIUS server to authenticate wireless clients using any one of several authentication protocols, including EAP-TLS and PEAPMS-CHAP v2.
D. Incorrect: Wired Equivalent Privacy (WEP), part of the IEEE 802.11 standard,
defines the encryption that WLAN systems use to secure their transmissions. WEP is not used for authentication and authorization.
Correct Answers: D
A. Incorrect: Protected Extensible Authentication Protocol-Microsoft-Challenge
Handshake Authentication Protocol version 2 (PEAP-MS-CHAP v2) is an authenti cation protocol for wireless networks that do not have access to a public key infra structure (PKI). Without a PKI, the network cannot use certificates, and without certificates, the network cannot use smart cards for authentication.
B. Incorrect: Remote Authentication Dial-In User Service (RADIUS) is not an
authentication protocol; it is a service that provides centralized authentication for other servers on the network, using any one of several authentication protocols.
C. Incorrect: RC4 is not an authentication protocol; it is an encryption algorithm
that wireless systems use as part of their WEP implementations.
D. Correct: Extensible Authentication Protocol-Transport Level Security (EAP-TLS) is
the only authentication protocol supported by Windows Server 2003 that enables users to authenticate with smart cards.
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Planning and Maintaining Network Security (5.0)
Correct Answers: A and C
A. Correct: When you use Shared Key authentication, each client s network key is
unique to its initial access point. Connecting to other access points requires a dif ferent key, which is one possible explanation for the clients failure to connect to multiple access points.
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