QUESTION: 257

Which of the following authentication options support digital certificates as client identification?

CHAP
EAP-TLS
PAP
MS-CHAPv2

Answer(s): B

Explanation:

What is the TLS (Transport Layer Security) Authentication Method? EAP-TLS is an IETF-standardized authentication method based on the same protocol used for secure Web traffic via the SSL (Secure Sockets Layer) protocol. TLS authentication within EAP is very simple. You take the TLS session establishment dialog between the supplicant and the authentication server and pack each TLS message inside of an EAP-TLS packet. When the TLS authentication dialog succeeds, the authenticator is informed and access to the network is granted.
Although TLS has actually set up an encrypted channel between the authentication server and the supplicant, this channel is not used---the supplicant wants to talk to the authenticator, not the authentication server. Instead, a piece of the keying material created during the TLS session establishment for that channel is sent to the authenticator. Then, the supplicant (which already knows the TLS-established secret key) and authenticator use that key for WEP encryption. In EAP-TLS, certificates are used to authenticate the authentication server to the supplicant, and, optionally, to authenticate the supplicant to the authentication server. The authentication server starts by sending its digital certificate to the supplicant. The most common authentication used today on the Web with SSL is one-way authentication - a server sends its certificate to your browser to prove its identity.

Reference:

http://www.ilabs.interop.net/WLAN_Sec_2002_Spring/ni_2002_las_eap_types.pdf

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QUESTION: 258

An RF signal of 2 Watts is applied to a 100-foot antenna cable, however, only 1 Watt of transmit power is actually developed at the input of the transmitting antenna. What is the resulting cable loss, measured in decibels (dB)?

0.5 dB
1 dB
3 dB
5 dB

Answer(s): C

Explanation:

The decibel (dB) is one of the most useful parameters in radio communications. It allows one to simply add all of the losses and gains together in order to calculate how much power is actually leaving the antenna and to calculate the effective radiated power. The decibel itself is a ratio, it has no unit and is meaningless unless you state the value or unit that it is related to.
Transmitter output power can be quoted in decibel watts (dBW). This value is calculated from the equation 10 log10 P, where P is the power in watts.

db = 10 log ( 2 / 1 ) = 10 log 2 = 3 db
http://website.lineone.net/~colin_mccord/Radio/decibel.htm

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QUESTION: 259

Which of the following are purposes of a wireless Ethernet Converter? Select two. A.
To wireless bridge between two or more wired Ethernet segments

To connect a client with a wired network interface card to a wireless network
To convert an Ethernet switch into an access point
To eliminate computer disassembly while adding wireless LAN functionality
To connect a serial printer to the wireless network

Answer(s): B,D

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QUESTION: 260

What does the IEEE 802.11b standard define?

How Mobile IP is implemented on a wireless LAN
How a station associates with Access Points
How users are tracked between two Access Points on the same subnet
How users are tracked across subnet boundaries

Answer(s): B

Explanation:

While 802.11b defines how a station associates with APs, it does not define how APs track users as they roam about, either at Layer 2 between two APs on the same subnet, or at Layer 3 when the user crosses a router boundary between subnets. The first issue is handled by vendor-specific inter-AP protocols, which vary in performance

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QUESTION: 257

Explanation:

Reference:

QUESTION: 258

Explanation:

QUESTION: 259

QUESTION: 260

Explanation: