Q.Which security system controls the traffic entering and leaving a network and blocks unauthorised access from outside?
(A) Antivirus
(B) Cookie
(C) Firewall
(D) Digital signature

Network security protects a computer, its data, and the network from threats. Malware includes viruses (spread by attaching to run files), worms (spread across a network by themselves), trojan horses (hide inside useful-looking programs), and spyware (secretly steal information); prevention includes antivirus software, updates, safe browsing, scanning devices, strong passwords, and backups. A cookie is a small file a website stores to remember a user. A firewall controls traffic in and out of a network, blocking unauthorised access. A digital signature electronically signs a document to prove the sender and that it was not altered (authenticity, integrity, non-repudiation). Cyber crimes (hacking, phishing, identity theft, online fraud, piracy) are dealt with in India chiefly by the Information Techno …