PowerPoint - Community College of Rhode Island
... Short Slot Times - The amount of time a device waits after a collision before retransmitting a packet. You can increase throughput on 802.11g, 2.4-GHz radios by enabling short slot time (most .11g radios enable this by default). Reducing the slot time from the standard 20 microseconds to the 9-micro ...
... Short Slot Times - The amount of time a device waits after a collision before retransmitting a packet. You can increase throughput on 802.11g, 2.4-GHz radios by enabling short slot time (most .11g radios enable this by default). Reducing the slot time from the standard 20 microseconds to the 9-micro ...
Figure 17-1
... – 802.11n: Multiple input/multiple output (MIMO) • 2.4 GHz and 5 GHz range, 600 Mbps speed possible ...
... – 802.11n: Multiple input/multiple output (MIMO) • 2.4 GHz and 5 GHz range, 600 Mbps speed possible ...
Chapter 1
... TCP/IP or other protocol packets and decode the contents. • Three of the most effective methods for counteracting eavesdropping are as follows: • Using switched networks instead of hubs so that traffic is not broadcast to all endpoints or network hosts. • Using encryption that meets the data securit ...
... TCP/IP or other protocol packets and decode the contents. • Three of the most effective methods for counteracting eavesdropping are as follows: • Using switched networks instead of hubs so that traffic is not broadcast to all endpoints or network hosts. • Using encryption that meets the data securit ...
SRA Customized Web Portal | Secure Remote Access | SonicWALL
... End users can easily and securely gain access to e-mail, files, and applications on the corporate LAN. The customizable Web interface provides a highly personalized experience for each end user. The end user does not need to install, configure or update any client software, because secure access is ...
... End users can easily and securely gain access to e-mail, files, and applications on the corporate LAN. The customizable Web interface provides a highly personalized experience for each end user. The end user does not need to install, configure or update any client software, because secure access is ...
Information Survivability for Mobile Wireless Systems
... ■ Mobile wireless networks are more vulnerable to cyber attack and more difficult to defend than conventional wired networks. In discussing security and survivability issues in mobile wireless networks, we focus here on group communication, as applied to multimedia conferencing. The need to conserve ...
... ■ Mobile wireless networks are more vulnerable to cyber attack and more difficult to defend than conventional wired networks. In discussing security and survivability issues in mobile wireless networks, we focus here on group communication, as applied to multimedia conferencing. The need to conserve ...
Efficient Mobility Management for Vertical Handoff between WWAN
... system as a background service. VC：implemented in the system together with the TCP/IP stack, and is located naturally between the network and transport layers. ...
... system as a background service. VC：implemented in the system together with the TCP/IP stack, and is located naturally between the network and transport layers. ...
Quality of Service versus Any Service at All
... Minimize/mitigate effects of attacks & traffic surges Classify traffic into good, bad, and ugly (suspicious) – Good: standing patterns and operator-tunable policies – Bad: evolves faster, harder to characterize – Ugly: cannot immediately be determined as good or bad ...
... Minimize/mitigate effects of attacks & traffic surges Classify traffic into good, bad, and ugly (suspicious) – Good: standing patterns and operator-tunable policies – Bad: evolves faster, harder to characterize – Ugly: cannot immediately be determined as good or bad ...
Fault Tolerance in ZigBee Wireless Sensor Networks
... the Trust Center and being the repository for security keys. Router: These devices extend network area coverage, dynamically route around obstacles, and provide backup routes in case of network congestion or device failure. They can connect to the coordinator and other routers, and also support ch ...
... the Trust Center and being the repository for security keys. Router: These devices extend network area coverage, dynamically route around obstacles, and provide backup routes in case of network congestion or device failure. They can connect to the coordinator and other routers, and also support ch ...
Computer networks Considerations When Choosing a Topology
... Many home networks use the star topology. A star network features a central connection point called a "hub" that may be a hub, switch or router. Devices typically connect to the hub with Unshielded Twisted Pair (UTP) Ethernet. Compared to the bus topology, a star network generally requires more cabl ...
... Many home networks use the star topology. A star network features a central connection point called a "hub" that may be a hub, switch or router. Devices typically connect to the hub with Unshielded Twisted Pair (UTP) Ethernet. Compared to the bus topology, a star network generally requires more cabl ...
Forcepoint™ Stonesoft Next Generation Firewall
... applications, data centers, and endpoints. Once inside, they can steal intellectual property, customer information, and other sensitive data, causing irreparable damage to businesses and reputations. Some attackers use advanced evasion techniques (AETs) that are able to bypass most of today’s securi ...
... applications, data centers, and endpoints. Once inside, they can steal intellectual property, customer information, and other sensitive data, causing irreparable damage to businesses and reputations. Some attackers use advanced evasion techniques (AETs) that are able to bypass most of today’s securi ...
William Stallings, Cryptography and Network Security 3/e
... The outside router advertises only the existence of the screened subnet to the Internet; therefore, the internal network is invisible to the Internet. Similarly, the inside router advertises only the existence of the screened subnet to the internal network; therefore, the systems on the inside netwo ...
... The outside router advertises only the existence of the screened subnet to the Internet; therefore, the internal network is invisible to the Internet. Similarly, the inside router advertises only the existence of the screened subnet to the internal network; therefore, the systems on the inside netwo ...
Final bits of OS - Department of Computer Science
... • Result: a transport allowing hosts to send IP event notification messages to syslog servers – provides a very general message format – allowing processes and applications to use suitable conventions for ...
... • Result: a transport allowing hosts to send IP event notification messages to syslog servers – provides a very general message format – allowing processes and applications to use suitable conventions for ...
Hands-On Ethical Hacking and Network Security
... operating systems and services Techniques to harden Microsoft systems against common vulnerabilities Best practices for securing Microsoft ...
... operating systems and services Techniques to harden Microsoft systems against common vulnerabilities Best practices for securing Microsoft ...
BOOTP Packet Format - Texas Tech University
... “Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port ...
... “Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port ...
Security
... network layer (and sometimes transport layer) protocols and addresses. Netprog: Security ...
... network layer (and sometimes transport layer) protocols and addresses. Netprog: Security ...
Polygraph: Automatically Generating Signatures for
... wide field of protocols • CMU ns wireless “extensions” the basis of most ad hoc networking research for next 5+ years ...
... wide field of protocols • CMU ns wireless “extensions” the basis of most ad hoc networking research for next 5+ years ...
computer network - CCRI Faculty Web
... messaging/chat programs, and even video and photo software that include an upload feature ...
... messaging/chat programs, and even video and photo software that include an upload feature ...
Acceptable User Policy
... The customer must comply with these guidelines at all times which can be obtained from other users of the newsgroup upon request, or from the group's administrators/moderators. The following are prohibited practices with regard to Usenet newsgroups and Cybersmart reserves the right to delete and/or ...
... The customer must comply with these guidelines at all times which can be obtained from other users of the newsgroup upon request, or from the group's administrators/moderators. The following are prohibited practices with regard to Usenet newsgroups and Cybersmart reserves the right to delete and/or ...
Security – A Big Question for Big Data
... Flaws in System Solutions Missed • False security from isolated components • Customers cannot responsibly judge flaws – Lack “approved” system security evaluation criteria – Unskilled in assessing methods to address subversion ...
... Flaws in System Solutions Missed • False security from isolated components • Customers cannot responsibly judge flaws – Lack “approved” system security evaluation criteria – Unskilled in assessing methods to address subversion ...
set 2 - of Manish Mehta
... • TCP/IP is the most common protocol targeted by commercial IDS. • Different technologies can resolve different levels of protocols through the application layer. ...
... • TCP/IP is the most common protocol targeted by commercial IDS. • Different technologies can resolve different levels of protocols through the application layer. ...
Chapter 5 Protection of Information Assets
... communications software to check the authentication of a terminal when it tries to send or receive messages • Data encryption should be used, where appropriate, to protect messages from disclosure during transmission ...
... communications software to check the authentication of a terminal when it tries to send or receive messages • Data encryption should be used, where appropriate, to protect messages from disclosure during transmission ...
Wireless security
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Wireless security is the prevention of unauthorized access or damage to computers using wireless networks. The most common types of wireless security are Wired Equivalent Privacy (WEP) and Wi-Fi Protected Access (WPA). WEP is a notoriously weak security standard. The password it uses can often be cracked in a few minutes with a basic laptop computer and widely available software tools. WEP is an old IEEE 802.11 standard from 1999, which was outdated in 2003 by WPA, or Wi-Fi Protected Access. WPA was a quick alternative to improve security over WEP. The current standard is WPA2; some hardware cannot support WPA2 without firmware upgrade or replacement. WPA2 uses an encryption device that encrypts the network with a 256-bit key; the longer key length improves security over WEP.Many laptop computers have wireless cards pre-installed. The ability to enter a network while mobile has great benefits. However, wireless networking is prone to some security issues. Hackers have found wireless networks relatively easy to break into, and even use wireless technology to hack into wired networks. As a result, it is very important that enterprises define effective wireless security policies that guard against unauthorized access to important resources. Wireless Intrusion Prevention Systems (WIPS) or Wireless Intrusion Detection Systems (WIDS) are commonly used to enforce wireless security policies.The risks to users of wireless technology have increased as the service has become more popular. There were relatively few dangers when wireless technology was first introduced. Hackers had not yet had time to latch on to the new technology, and wireless networks were not commonly found in the work place. However, there are many security risks associated with the current wireless protocols and encryption methods, and in the carelessness and ignorance that exists at the user and corporate IT level. Hacking methods have become much more sophisticated and innovative with wireless access. Hacking has also become much easier and more accessible with easy-to-use Windows- or Linux-based tools being made available on the web at no charge.Some organizations that have no wireless access points installed do not feel that they need to address wireless security concerns. In-Stat MDR and META Group have estimated that 95% of all corporate laptop computers that were planned to be purchased in 2005 were equipped with wireless cards. Issues can arise in a supposedly non-wireless organization when a wireless laptop is plugged into the corporate network. A hacker could sit out in the parking lot and gather information from it through laptops and/or other devices, or even break in through this wireless card–equipped laptop and gain access to the wired network.