When the radio type of the AR router is set to pure 802.11n and the encryption mode is set to WEP, why does the wireless device fail to connect to the AP

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WEP is insecure, so 802.11n does not support WEP encryption.
When the radio type is set to pure 802.11n, the following encryption modes are supported:
-open
-wpa-psk ccmp
-wpa2-psk ccmp
-wapi
-wpa dot1x ccmp
-wpa2 dot1x ccmp

Other related questions:
When the radio type of the AR router is set to pure 80211.11n and the encryption mode is set to TKIP, why does the wireless device fail to connect to the AP
TKIP is insecure, so 802.11n does not support TKIP encryption. When the radio type is set to pure 802.11n, the following encryption modes are supported: -open -wpa-psk ccmp -wpa2-psk ccmp -wapi -wpa dot1x ccmp -wpa2 dot1x ccmp

Why cannot a STA associate with an AP when the radio type is set to pure 802.11n and the encryption mode is set to TKIP
TKIP is insecure, so 802.11n does not support TKIP encryption.

Why does a STA fail to associate with an AP when WEP and TKIP encryption is configured in 802.11n mode
The 802.11n does not define the WEP or TKIP encryption mode. When the two encryption modes are used, STAs may fail to associate with the AP.

How to configure the WEP security policy on WLAN devices
For V200R003 and V200R005, you can perform the following steps on ACs or Fat APs to configure the WEP security policy: 1. Run the security-profile { id profile-id | name profile-name } * command in the WLAN view to display the security profile view. The variable profile-id specifies the ID of a security profile, and profile-name specifies the name of the security profile. 2. Run the security-policy wep command in the security profile view to set the security policy to WEP. By default, the security policy is WEP. By default, WEP uses open system authentication and non-encryption. The default configuration has security risks, so you are advised to configure the Portal security policy or use WPA/WPA2 authentication. 3. Configure the authentication and encryption modes: - Configure open system authentication + non-encryption: a. Run the wep authentication-method open-system [ data-encrypt ] command in the security profile view to configure WEP open system authentication. b. The variable data-encrypt indicates open system authentication and WEP encryption. In this case, you must run the wep key command and the wep default-key command to set the WEP shared key, which is used for generating the encryption key to encrypt WLAN data packets. - Configure the shared key authentication + WEP encryption: a. Run the wep authentication-method share-key command in the security profile view to configure WEP shared key authentication. b. Run the wep key { wep-40 | wep-104 | wep-128 } { pass-phrase | hex } key-id cipher cipher-key-value command in the security profile view to configure the WEP shared key and key ID. The variable key-id specifies the key ID, and cipher-key-value specifies the password in cipher text. c. Run the wep default-key key-id command in the security profile view to set the key ID of the WEP shared key. The variable key-id specifies the default key ID. A maximum of four WEP keys can be configured, and only one WEP key is valid at a time. 4. Run the commit { all | ap ap-id } command in the WLAN view to deliver configurations to the APs (applicable only to the AC). The variable ap-id specifies the AP ID.

Convergence fails on the Huawei switch connected to the wireless CG device in STP mode. Why
When the switch encapsulates STP BPDUs, the Length field in the 802.3 Ethernet frame header contains 8-byte filling bits. However, the wireless CG device performs strict check for the Length field, and directly discards STP BPDUs sent by the switch. Convergence fails.

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