Cisco AIR-AP1141N-A-K9 - 802.11G/N Fixed Auto Ap; Int A Посібник для початківців - Сторінка 16
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you cannot create additional SSIDs with WPA authentication because they use different encryption
settings. If you find that the security setting for an SSID conflicts with another SSID, you can delete
one or more SSIDs to eliminate the conflict.
If any VLANs are defined on the access point, the trunk port on the switch must be limited to allow
only the VLANs defined on the access point.
Express Security Types
There are four security types you can assign to an SSID:
• No security—The least secure option. Use this option only for SSIDs used in a public space, and
assign it to a VLAN that restricts access to your network.
• Static WEP Key—More secure than no security. Static WEP keys are vulnerable to attack. There
are two different lengths for WEP keys: 40-bit and 128-bit (hexadecimal or ASCII characters).
Cisco access points use hexadecimal characters. Client adapters can use either, depending on how
the vendor chooses to configure them.
• EAP Authentication—Enables 802.1x authentication. Requires an IP address and shared secret
from an authentication server on your network (server authentication port 1645). You do not need
to enter a WEP key.
• WPA—Wi-Fi Protected Access (WPA) permits wireless access to users authenticated against a
database through the services of an authentication server and encrypts their IP traffic with
stronger algorithms than those used in WEP. As with EAP authentication, you must enter the IP
address and shared secret for an authentication server on your network (server authentication port
1645).
Configuring Security for 802.11n
To achieve 802.11n speeds, you need to configure the access point for no encryption or WPA2/AES
encryption. Any other setting eliminates 802.11n capabilities from the configuration.
Express Security Limitations
Because the Express Security page is designed for simple configuration of basic security, the options
available are a subset of the access point security capabilities. Keep these limitations in mind when
using the Express Security page:
• You cannot edit SSIDs. However, you can delete SSIDs and recreate them.
• You cannot assign SSIDs to specific radio interfaces. The SSIDs that you create are enabled on all
radio interfaces. To assign SSIDs to specific radio interfaces, choose Security > SSID Manager.
• You cannot configure multiple authentication servers. To configure multiple authentication
servers, click Security > Server Manager.
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