Without proper safeguards, every part of a network is vulnerable to a security breach or u

nauthorized activity from （）, competitors, or even employees. Many of the organizations that manage their own （） network security and use the Internet for more than just sending/receiving e-mails experience a network （）— and more than half of these companies do not even know they were attacked. Smaller （） are often complacent, having gained a false sense of security. They usually react to the last virus or the most recent defacing of their website. But they are trapped in a situation where they do not have the necessary time and（）to spend on security.

A.intruders

B.terminals

C.hosts

D.users@@@SXB@@@A.exterior

B.internal

C.centre

D.middle@@@SXB@@@A.attack

B.collapse

C.breakdown

D.virus@@@SXB@@@A.users

B.campuses

C.Companies

D.networks@@@SXB@@@A.safeguards

B.businesses

C.experiences

D.Resources