多项选择题

Select the two correctstatements from the list below that describe DES and 3DES：（）

A. 3DES is muchmore secure than DES.
B. Both DES and 3DES are stream ciphers.
C. DES uses 64 bitkeys， although the effective key lengthis only 56bits.
D. The decryption operation for both DES and 3DES is the same as the encryption operation.
E. DES can only be used for encryption， whereas 3DES can also be used for authentication.

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多项选择题

WhichofthefollowingistrueaboutRADIUSV end orSpecificAttribute？（）

A. The RADIUSVendor Specific Attribute type is decimal 26.
B. A radius server that does not understandthevendor-specific information sent by a clientmust reject the authentication request.
C. A vendor can freely choose theVendor-ID it wants to use when implementing Vendor Specific Attributes as long as the same Vendor-ID is used on all of its products.
D. Vendor Specific AttributeMUST include the Length field.
E. In Cisco’s Vendor Specific Attribute implementation， vendor-ID of 1 is commonly referred to as Cisco AV（Attribute Value） pairs.
F. Vendor Specific Attributes use a RADIUS attribute type between 127 and 255.

单项选择题

WhichoneofthefollowingisNOT avalidRADIUSpackettype？（）

A. Access-reject
B. Access-response
C. Access-challenge
D. Access-reply
E. Access-accept

Select the two correctstatements from the list below that describe DES and 3DES： （）

Select the two correctstatements from the list below that describe DES and 3DES：（）