Secure And Insecure Wireless Network Topology Options

By Author: Jasmine
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Although the security features built in to MCSE 2003 exams networks are few, there are options. The following authentication and encryption choices must be made as part of the design process.
The 802.11 standard defines the following two types of authentication:
Open System Authentication—No authentication is done unless it is com-bined with Media Access Control (MAC) address restriction on the AP.
Shared Key Authentication—A shared secret is used. There is no method defined for key distribution. The key configured on the AP must be known to the person manually configuring the client. The process is difficult to main?tain especially in a large environment or when shared keys are frequently changed to increase security.
Wired Equivalent Privacy (WEP) encrypts the data sent between wireless nodes using RC4. No key management protocol is defined. Keys
must be manually distributed and added to free Microsoft certification exam papers wireless clients. Manual changes are required. The ...
... following two keys are defined:
A global key that protects multicast and broadcast traffic from a wireless AP to its clients.
A session key that protects unicast traffic between the AP and its clients and that protects multicast and broadcast traffic sent from clients to the AP.
This is an interim standard that follows the proposed 802.Hi wireless standard. This standard provides improved encryption by
using the Temporal Key Integrity Protocol (TKIP). TKIP provides integrity. Authentication is provided by the use of the Extensible Authentication Protocol (EAP).This is a new security standard for 802.11 networks that uses RADIUS for authentication and provides key management.
Use Open System Authentication. In many wireless implementations, including Windows XP, the wireless authentication shared key is the same as the wireless encryption key. Shared key authentication uses a challenge and response mechanism, which is subject to attack. If an intruder can capture the challenge and
response, he might be able to deduce the shared key and therefore have both the authentication key MCSE 2003 certification and the encryption key for your wireless network.