NETWORK SECURITY

Network Security Is Essential

=> Network security is essential because the Internet has made networked computers accessible and vulnerable.

* Network Security Threats

# There are four primary threats to network security:
=>Unstructured threats
=> Structured threats
=> External threats
=> Internal threats

* Three Primary Network Attacks

# There are three types of network attacks:
=> Reconnaissance attacks
=> Access attacks
=> Denial of service attacks

*Reconnaissance Attacks and Mitigation

# Reconnaissance refers to the overall act of learning information about a target network by using readily available information and applications(Actively and Passively).......

# Reconnaissance attacks include:
– Packet sniffers
– Port scans
– Ping sweeps
– Internet information queries

*Packet Sniffer

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# A packet sniffer is a software application that uses a network adapter card in promiscuous mode to capture all network packets.

# Packet sniffers:

– Exploit information passed in plaintext. Protocols that pass information in plaintext are Telnet, FTP,SNMP, POP, and HTTP.
– Must be on the same collision domain.
– Used legitimately, or can be designed specifically for attack.

Packet Sniffer Mitigation

The mitigation techniques and tools include:
=> Authentication
=> Cryptography
=> Antisniffer tools
=> Switched infrastructure