单项选择题
__________(1)wrote，“Friendships are，from year to year，the best of all life's treasures.”But__________(2)a good friend to someone is never simple or easy.It__________(3)wisdom and lots of hard work.Demanding that a friend give his full attention__________(4)you can destroy a relationship.Let your friend decide for himself __________(5)to spend time with.
1. （）
A.No one
B.Someone
C.Everyone
D.Anyone
相关考题
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单项选择题
Hardware networking devices operate within the protocol stack just like protocols them-selves.Thus，hardware networking devices can be associated with an OSI model layerrelated to the protocols they manage or control.At which layer of the OSI model does arouter operate？（）
A.Network layer
B.Layer 1
C.Transport layer
D.Layer 5 -
单项选择题
Unfortunately，attackers have many options of attacks to perform against their targets. Which of the following is considered a denial-of-service （DoS）attack？（）
A.Pretending to be a technical manager over the phone and asking a receptionist to change their password
B.While surfing the web，sending to a web server a malformed URL that causes the system to consume 100 percent of the CPU
C.Intercepting network traffic by copying the packets as they pass through a specific subnet
D.Sending message packets to a recipient who did not request them，simply to be annoying -
单项选择题
Some adversaries use DoS attacks as their primary weapon to harm targets，whereas othersmay use them as weapons of last resort when all other attempts to intrude on a target fail. Which of the following is most likely to detect DoS attacks？（）
A.Host-based IDS
B.Network-based IDS
C.Vulnerability scanner
D.Penetration testing
