Question 220 of 530 from exam 400-251: CCIE Security written exam

Question 220 of 530 from exam 400-251: CCIE Security written exam

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Refer to the exhibit.

W6d: TPSEC(validate_proposal_request): proposal part #1,
(key eng. msg.) INBOUND local= 172.16.1.20, renote= 172.16.1.10,
ocal_proxy= 10.1.2.0/255.255.255.0/0/0 (type=4),
remote proxy= 10.1.1,0/255.255.255.0/0/0 (type=4),
protocol= ESP, transform= esp-3des esp-md5-hmac ,
lifedur= 0s and Okb,
spi= 0x0(0), conn_id= 0, keysize= 0, flags= Ox4
Wd: IPSEC(validate_transform proposal): proxy identities not supported
Wed: ISAKMP (022): IPSec policy invalidated proposal
wed: ISAKMP (0:2): phase 2 SA not acceptable!

What is the cause of the issue that is reported in this debug output?

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A. B. C. D.

C.