CCNA_Security_01-bupt

CCNA_Security_01-bupt - 1 CCNA Security Chapter 1 Modern...

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Unformatted text preview: 1 CCNA Security Chapter 1: Modern Network Security Chapter 1: Modern Network Security Threats Threats 2 Lesson Objectives Describe the evolution of network security. Describe the drivers for network security. Describe the major network security organizations. Describe the domains of network security. Describe network security policies. Describe viruses, worms, and Trojan Horses. 3 Lesson Objectives Describe how to mitigate threats from viruses, worms, and Trojan Horses. Describe how network attacks are categorized . Describe reconnaissance attacks. Describe access attacks. Describe Denial of Service attacks. Describe how to mitigate network attacks. 4 Modern Network Security Threats 1.1 1.1 Fundamental Principles of a Secure Network Fundamental Principles of a Secure Network 1.2 1.2 Viruses, Worms, and Trojan Horses Viruses, Worms, and Trojan Horses 1.3 1.3 Attack Methodologies Attack Methodologies 5 1.1 Fundamental Fundamental Principles Principles of a Secure Network 6 1.1 Fundamental Principles Fundamental Principles of a Secure Network 1.1.1 1.1.1 Evolution Evolution of Network Security of Network Security 1.1.2 1.1.2 Drivers Drivers for Network Security for Network Security 1.1.3 Network Security Organizations 1.1.3 Network Security Organizations 1.1.4 1.1.4 Domains Domains of Network Security of Network Security 1.1.5 Network Security 1.1.5 Network Security Polices Polices 7 1.1.1 Evolution of Network Security In July 2001, the In July 2001, the Code Red Code Red worm attacked worm attacked web servers globally, infecting over web servers globally, infecting over 350,000 350,000 hosts. hosts. 8 Evolution of Network Security “ “ Necessity is the Necessity is the mother mother of invention.” of invention.” 9 Evolution of Network Security 10 Evolution of Network Security Internal threats Internal threats can cause even greater can cause even greater damage damage than than external threats external threats . . 11 Evolution of Network Security Confidentiality Confidentiality Integrity Integrity Availability Availability 12 Security Services (ITU-T X.800) Authentication- assurance that the communicating entity is the one claimed 2 Public key mechanism Data Confidentiality –protection of data from unauthorized disclosure 2 Encryption algorithm Data Integrity- assurance that data received is as sent by an authorized entity 2 Message digest (MD5, SHA1) generated by hashing Non-Repudiation- protection against denial by one of the parties in a communication 2 Digital signature via public key mechanism 13 Security Services (2) (ITU-T X.800) Access Control- prevention of the unauthorized use of a resource 2 Authentication/Authorization, policy-based packet filtering Availability – guarantee that resources can be accessed 2 Intrusion Detection System (IDS), Intrusion Prevention System (IPS), Firewall 14...
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