A、It supports VLSM.
B、It is used to route between autonomous systems.
C、It confines network instability to one area of the network.
D、It increases routing overhead on the network.
E、It allows extensive control of routing updates.
F、It is simpler to configure than RIP v2.
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A、 RC4 is a stream cipher B、 Stream ciphers require padding C、 AES is a block cipher D、 DES and 3DES are stream ciphers E、 AES is a stream cipher F、 AES， DES， and 3DES can be used as HMAC algorithms
A、A.All of the assert statements are used appropriately. B、B.Only the assert statement on line 12 is used appropriately. C、C.Only the assert statement on line 15 is used appropriately. D、D.Only the assert statement on line 18 is used appropriately. E、E.Only the assert statements on lines 12 and 15 are used appropriately. F、F.Only the assert statements on lines 12 and 18 are used appropriately. H、G.Only the assert statements on lines 15 and 18 are used appropriately.
A、A. 3DES is muchmore secure than DES. B、B. Both DES and 3DES are stream ciphers. C、C. DES uses 64 bitkeys， although the effective key lengthis only 56bits. D、D. The decryption operation for both DES and 3DES is the same as the encryption operation. E、E. DES can only be used for encryption， whereas 3DES can also be used for authentication.
A、The CONNECT statement B、The first FETCH of a cursor C、The BEGIN TRANSACTION statement D、The first executable SQL statement
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