多项选择题

Choose the most correct statements about SMTP/ESMTP. （）

A. Open mail relays are often used for spamming.
B. ESMTP does NOT provide more security features than SMTP
C. SMTPdoes provide authenticated email sending."
D. Worms often spread via SMTP.

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热门试题

单项选择题CiscoCleanAccessensuresthatcomputersconnectingtoyournetworkhavewhichofthefollowing？（）

A. No vulnerable applications or operating systems
B. No viruses or worms
C. Appropriate security applications and patch levels
D. Current IPS signatures
E. Cisco Security Agent

单项选择题Whichoftheseisthebestwaytoprovidesendernon-repudiation？（）

A. pre-sharedkey
B. secure hash
C. SSL
D. RSA signature

单项选择题WhatgroupinCiscoIOSdoes1536-bitDiffie-Hellmanprimemodulusequivalenttoo？（）

A. group 3
B. group 1
C. group 5
D. group 7

单项选择题Whataretheheadersizesforpoint-to-pointandmulti-pointGRE（alsoknownasmGRE）withtunnelkey？（）

A. 4 bytes for both
B. 4 bytes， and 8 bytes respectively
C. 8 bytes for both
D. 24 bytes for both

单项选择题Whichonesarethetwotypeofciphers？（）

A. Blocking cipher andnon-blocking cipher
B. CBC cipher and EBC cipher
C. Block cipher and Stream cipher
D. Blocker cipher and Streamer cipher
E. 3DES cipher and AES cipher