Network security consists of the policies, processes and practices adopted to prevent, detect and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources.[1] Network security involves the authorization of access to data in a network, which is controlled by the network administrator. Users choose or are assigned an ID and password or other authenticating information that allows them access to information and programs within their authority. Network security covers a variety of computer networks, both public and private, that are used in everyday jobs: conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access. Network security is involved in organizations, enterprises, and other types of institutions. It does as its title explains: it secures the network, as well as protecting and overseeing operations being done. The most common and simple way of protecting a network resource is by assigning it a unique name and a corresponding password.
Network security starts with authentication, commonly with a username and a password. Since this requires just one detail authenticating the user name—i.e., the password—this is sometimes termed one-factor authentication. With two-factor authentication, something the user 'has' is also used (e.g., a security token or 'dongle', an ATM card, or a mobile phone); and with three-factor authentication, something the user 'is' is also used (e.g., a fingerprint or retinal scan).
Once authenticated, a firewall enforces access policies such as what services are allowed to be accessed by the network users.[2][3] Though effective to prevent unauthorized access, this component may fail to check potentially harmful content such as computer worms or Trojans being transmitted over the network.[4]Anti-virus software or an intrusion prevention system (IPS)[5] help detect and inhibit the action of such malware. An anomaly-based intrusion detection system may also monitor the network like wireshark traffic and may be logged for audit purposes and for later high-level analysis. Newer systems combining unsupervised machine learning with full network traffic analysis can detect active network attackers from malicious insiders or targeted external attackers that have compromised a user machine or account.[6]
Communication between two hosts using a network may be encrypted to maintain security and privacy.
Honeypots, essentially decoy network-accessible resources, may be deployed in a network as surveillance and early-warning tools, as the honeypots are not normally accessed for legitimate purposes. Honeypots are placed at a point in the network where they appear vulnerable and undefended, but they are actually isolated and monitored.[7] Techniques used by the attackers that attempt to compromise these decoy resources are studied during and after an attack to keep an eye on new exploitation techniques. Such analysis may be used to further tighten security of the actual network being protected by the honeypot. A honeypot can also direct an attacker's attention away from legitimate servers. A honeypot encourages attackers to spend their time and energy on the decoy server while distracting their attention from the data on the real server. Similar to a honeypot, a honeynet is a network set up with intentional vulnerabilities. Its purpose is also to invite attacks so that the attacker's methods can be studied and that information can be used to increase network security. A honeynet typically contains one or more honeypots.[8]
Security management
Security management for networks is different for all kinds of situations. A home or small office may only require basic security while large businesses may require high-maintenance and advanced software and hardware to prevent malicious attacks from hacking and spamming. In order to minimize susceptibility to malicious attacks from external threats to the network, corporations often employ tools which carry out network security verifications].
Types of attack
Networks are subject to attacks from malicious sources. Attacks can be from two categories: "Passive" when a network intruder intercepts data traveling through the network, and "Active" in which an intruder initiates commands to disrupt the network's normal operation or to conduct reconnaissance and lateral movements to find and gain access to assets available via the network.[9]
Network Security: PRIVATE Communication in a PUBLIC World, Charlie Kaufman | Radia Perlman | Mike Speciner, Prentice-Hall, 2002. ISBN9780137155880
Network Infrastructure Security, Angus Wong and Alan Yeung, Springer, 2009. ISBN978-1-4419-0165-1
March 20, 2023
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Network security consists of the policies processes and practices adopted to prevent detect and monitor unauthorized access misuse modification or denial of a computer network and network accessible resources 1 Network security involves the authorization of access to data in a network which is controlled by the network administrator Users choose or are assigned an ID and password or other authenticating information that allows them access to information and programs within their authority Network security covers a variety of computer networks both public and private that are used in everyday jobs conducting transactions and communications among businesses government agencies and individuals Networks can be private such as within a company and others which might be open to public access Network security is involved in organizations enterprises and other types of institutions It does as its title explains it secures the network as well as protecting and overseeing operations being done The most common and simple way of protecting a network resource is by assigning it a unique name and a corresponding password Contents 1 Network security concept 2 Security management 2 1 Types of attack 3 See also 4 References 5 Further readingNetwork security concept EditNetwork security starts with authentication commonly with a username and a password Since this requires just one detail authenticating the user name i e the password this is sometimes termed one factor authentication With two factor authentication something the user has is also used e g a security token or dongle an ATM card or a mobile phone and with three factor authentication something the user is is also used e g a fingerprint or retinal scan Once authenticated a firewall enforces access policies such as what services are allowed to be accessed by the network users 2 3 Though effective to prevent unauthorized access this component may fail to check potentially harmful content such as computer worms or Trojans being transmitted over the network 4 Anti virus software or an intrusion prevention system IPS 5 help detect and inhibit the action of such malware An anomaly based intrusion detection system may also monitor the network like wireshark traffic and may be logged for audit purposes and for later high level analysis Newer systems combining unsupervised machine learning with full network traffic analysis can detect active network attackers from malicious insiders or targeted external attackers that have compromised a user machine or account 6 Communication between two hosts using a network may be encrypted to maintain security and privacy Honeypots essentially decoy network accessible resources may be deployed in a network as surveillance and early warning tools as the honeypots are not normally accessed for legitimate purposes Honeypots are placed at a point in the network where they appear vulnerable and undefended but they are actually isolated and monitored 7 Techniques used by the attackers that attempt to compromise these decoy resources are studied during and after an attack to keep an eye on new exploitation techniques Such analysis may be used to further tighten security of the actual network being protected by the honeypot A honeypot can also direct an attacker s attention away from legitimate servers A honeypot encourages attackers to spend their time and energy on the decoy server while distracting their attention from the data on the real server Similar to a honeypot a honeynet is a network set up with intentional vulnerabilities Its purpose is also to invite attacks so that the attacker s methods can be studied and that information can be used to increase network security A honeynet typically contains one or more honeypots 8 Security management EditSecurity management for networks is different for all kinds of situations A home or small office may only require basic security while large businesses may require high maintenance and advanced software and hardware to prevent malicious attacks from hacking and spamming In order to minimize susceptibility to malicious attacks from external threats to the network corporations often employ tools which carry out network security verifications Types of attack Edit Networks are subject to attacks from malicious sources Attacks can be from two categories Passive when a network intruder intercepts data traveling through the network and Active in which an intruder initiates commands to disrupt the network s normal operation or to conduct reconnaissance and lateral movements to find and gain access to assets available via the network 9 Types of attacks include 10 Passive Network Wiretapping Passive Port scanner Idle scan Encryption Traffic analysis Active Virus Eavesdropping Data modificationDenial of service attack Active Port scanner DNS spoofing Man in the middle ARP poisoning VLAN hopping Smurf attack Buffer overflow Heap overflow Format string attack SQL injection Phishing Cross site scripting CSRF Cyber attackSee also EditCloud computing security Computer security Crimeware IT security standards Data loss prevention software Greynet Identity based security Metasploit Project Mobile security Network enclave Network Security Toolkit TCP Gender Changer TCP sequence prediction attack List of security hacking incidents Wireless security Dynamic secrets Low Orbit Ion Cannon High Orbit Ion CannonReferences Edit What is Network Security Poda myre Forcepoint 2018 08 09 Retrieved 2020 12 05 A Role Based Trusted Network Provides Pervasive Security and Compliance interview with Jayshree Ullal senior VP of Cisco Macfarlane Richard Buchanan William Ekonomou Elias Uthmani Omair Fan Lu Lo Owen 2012 Formal security policy implementations in network firewalls Computers amp Security 31 2 253 270 doi 10 1016 j cose 2011 10 003 Rana Shrikant 2021 12 01 The Learning Zone 8 A Textbook for Computer Science Shrikant Rana ISBN 978 93 5593 008 8 Dave Dittrich Network monitoring Intrusion Detection Systems IDS Archived 2006 08 27 at the Wayback Machine University of Washington Dark Reading Automating Breach Detection For The Way Security Professionals Think October 1 2015 What is a honeypot How it protects against cyber attacks SearchSecurity Retrieved 2021 03 04 Honeypots Honeynets Honeypots net 2007 05 26 Retrieved 2011 12 09 Wright Joe Jim Harmening 2009 15 Computer and Information Security Handbook Morgan Kaufmann Publications Elsevier Inc p 257 BIG IP logout page PDF Cnss gov 1970 01 01 Archived from the original PDF on 2012 02 27 Retrieved 2018 09 24 Further reading EditCase Study Network Clarity Archived 2016 05 27 at the Wayback Machine SC Magazine 2014 Cisco 2011 What is network security Retrieved from cisco com Archived 2016 04 14 at the Wayback Machine Security of the Internet The Froehlich Kent Encyclopedia of Telecommunications vol 15 Marcel Dekker New York 1997 pp 231 255 Introduction to Network Security Archived 2014 12 02 at the Wayback Machine Matt Curtin 1997 Security Monitoring with Cisco Security MARS Gary Halleen Greg Kellogg Cisco Press Jul 6 2007 ISBN 1587052709 Self Defending Networks The Next Generation of Network Security Duane DeCapite Cisco Press Sep 8 2006 ISBN 1587052539 Security Threat Mitigation and Response Understanding CS MARS Dale Tesch Greg Abelar Cisco Press Sep 26 2006 ISBN 1587052601 Securing Your Business with Cisco ASA and PIX Firewalls Greg Abelar Cisco Press May 27 2005 ISBN 1587052148 Deploying Zone Based Firewalls Ivan Pepelnjak Cisco Press Oct 5 2006 ISBN 1587053101 Network Security PRIVATE Communication in a PUBLIC World Charlie Kaufman Radia Perlman Mike Speciner Prentice Hall 2002 ISBN 9780137155880 Network Infrastructure Security Angus Wong and Alan Yeung Springer 2009 ISBN 978 1 4419 0165 1 Retrieved from https en wikipedia org w index php title Network security amp oldid 1142588238, wikipedia, wiki, book, books, library,
