Which encryption protocols does an AR support

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AR routers support the Authentication Header (AH) and Encapsulating Security Payload (ESP) protocols. Their differences are as follows:
- AH: provides data origin authentication, data integrity check, and anti-replay services. The sender performs the hash algorithm on the IP payload and all header fields of an IP packet except for variable fields to generate a message digest. The receiver recalculates the message digest according to the received IP packet and compares the two message digests to determine whether the IP packet has been modified during transmission. AH does not encrypt the IP payload. It applies to non-confidential data transmission.
- ESP: encrypts the IP payload in addition to providing all the functions of AH. ESP can encrypt and authenticate the IP payload but does not protect the IP packet header. It applies to non-confidential data transmission.

AH and ESP can be used independently or together. When AH and ESP are used together, ESP encapsulation and then AH encapsulation are performed on an IP packet to be sent, providing higher security.

Other related questions:
Which encryption protocols does the AR support
The AR supports Authentication Header (AH) and Encapsulating Security Payload (ESP) protocols. Their differences are as follows: -AH: provides data origin authentication, data integrity check, and anti-replay. The sender performs the hash algorithm on the IP payload and all header fields of an IP packet except for variable fields to generate a message digest. The receiver recalculates the message digest according to the received IP packet and compares the two message digests to determine whether the IP packet has been modified during transmission. AH does not encrypt the IP payload. AH applies to non-confidential data transmission. -ESP: provides data encryption in addition to the functions provided by the AH protocol. ESP can encrypt and authenticate the IP payload but does not protect the IP packet header. ESP applies to confidential data transmission. AH and ESP can be used independently or together. When AH and ESP are used together, ESP and AH headers are encapsulated in sequence, enhancing security.

Which encryption communication protocols does IPSec support and what are their differences
IPSec supports Authentication Header (AH) and Encapsulating Security Payload (ESP) protocols. The differences between these protocols are: -AH: provides data origin authentication, data integrity check, and the anti-replay services. The sender performs the hash algorithm on the IP payload and all header fields of an IP packet except for variable fields to generate a message digest. The receiver recalculates the message digest according to the received IP packet and compares the two message digests to determine whether the IP packet has been modified during transmission. AH does not encrypt the IP payload. AH is applicable to transmit non-confidential data. -ESP: encrypts the IP payload in addition to providing all the functions of AH. ESP can encrypt and authenticate the IP payload but does not protect the IP packet header. ESP can be used to transmit confidential data. AH and ESP can be used independently or together. When AH and ESP are used together, ESP encapsulation and then AH encapsulation are performed on an IP packet to enhance security.

Which STP protocols does an AR router support
An AR router supports STP/RSTP/MSTP, but does not support VBST.

Which protocols does the ASPF firewall of an AR router support
The ASPF firewall of an AR router supports the following protocols: - File Transfer Protocol (FTP) - Hyper Text Transport Protocol (HTTP) - Internet Control Message Protocol (ICMP) - Session Initiation Protocol (SIP) - Real Time Streaming Protocol (RTSP) - Transmission Control Protocol (TCP) - Trivial File Transfer Protocol (TFTP) - User Datagram Protocol (UDP)

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