Intellinet 525497 Manuel d'utilisateur télécharger pdf (Page 78)

5.5 What is BSSID?

A six-byte address is that distinguishes a particular access point from others. Also known simply as

SSID. Serves as a network ID or name.

5.6 What is ESSID?

The Extended Service Set ID (ESSID) is the name of the network you want to access. It is used to

identify different wireless networks.

5.7 What are potential factors that may causes interference?

Factors of interference:

 Obstacles: walls, ceilings, furniture, etc.

 Building materials: metal doors, aluminum studs.

 Electrical devices: microwaves, monitors and electrical motors.

Solutions to overcome the interferences:

 Minimize the number of walls and ceilings.

 Position the WLAN antenna for best reception.

 Keep WLAN devices away from other electrical devices; e.g., microwaves, monitors and electric

motors.

 Add additional WLAN Access Points if necessary.

5.8 What are the Open System and Shared Key authentications?

IEEE 802.11 supports two subtypes of network authentication services: open system and shared key.

Under open system authentication, any wireless station can request authentication. The station that

needs to authenticate with another wireless station sends an authentication management frame that

contains the identity of the sending station. The receiving station then returns a frame that indicates

whether or not it recognizes the sending station. Under shared key authentication, each wireless station

is assumed to have received a secret shared key over a secure channel that is independent from the

802.11 wireless network communications channel.

5.9 What is WEP?

An option of IEEE 802.11 functionality is offering frame transmission privacy similar to a wired

network. The Wired Equivalent Privacy generates secret shared encryption keys that both source and

destination stations can use to alert frame bits to avoid disclosure to eavesdroppers. WEP relies on a

secret key that is shared between a mobile station (e.g., a laptop with a wireless Ethernet card) and an

access point (i.e., a base station). The secret key is used to encrypt packets before they are transmitted,

and an integrity check is used to ensure that packets are not modified in transit.

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Intellinet 525497 Manuel d'utilisateur Page 78