lecture 1 - CUNY Home
... What’s the Internet: an operational view Thus protocols define • format, order of messages sent and received among network entities, • actions taken on message transmission and receipt • address conflicts among network entities ...
... What’s the Internet: an operational view Thus protocols define • format, order of messages sent and received among network entities, • actions taken on message transmission and receipt • address conflicts among network entities ...
Data Communications Data Communications Features
... Must transmit in straight line with no obstructions Using 2 ~ 40 GHz bandwidth TV, PCS, wireless LAN, bluetooth ...
... Must transmit in straight line with no obstructions Using 2 ~ 40 GHz bandwidth TV, PCS, wireless LAN, bluetooth ...
PPT
... No base station, no connection to larger Internet. May have to relay to reach another given wireless ...
... No base station, no connection to larger Internet. May have to relay to reach another given wireless ...
What is a Network
... communications for an extranet community of buyers and suppliers, but VPNs are also used to secure many other types of communication – those internal to a company and links between different companies or agencies for information sharing, for example. The most common definition of an extranet is a ty ...
... communications for an extranet community of buyers and suppliers, but VPNs are also used to secure many other types of communication – those internal to a company and links between different companies or agencies for information sharing, for example. The most common definition of an extranet is a ty ...
IOSR Journal of Computer Engineering (IOSR-JCE) e-ISSN: 2278-0661,p-ISSN: 2278-8727 PP 10-14 www.iosrjournals.org
... areas that are developing at a high speed, with advanced techniques emerging in all the fields of mobile and wireless communications. Current times are just the beginning for deploying 3G mobile communication systems. At present we have many technologies each capable of performing functions like sup ...
... areas that are developing at a high speed, with advanced techniques emerging in all the fields of mobile and wireless communications. Current times are just the beginning for deploying 3G mobile communication systems. At present we have many technologies each capable of performing functions like sup ...
BCS433 Data Communication & Networking
... fixed packet (called cell) length with little overhead for error control anything from 10Mbps to Gbps constant data rate using packet switching technique with multiple virtual circuits ...
... fixed packet (called cell) length with little overhead for error control anything from 10Mbps to Gbps constant data rate using packet switching technique with multiple virtual circuits ...
Chapter 13: Wireless Networks
... Communication must take place in a terrain that makes wired communication difficult or impossible. A communication system must be deployed quickly. Communication facilities must be installed at low initial cost. The same information must be broadcast to many locations. ...
... Communication must take place in a terrain that makes wired communication difficult or impossible. A communication system must be deployed quickly. Communication facilities must be installed at low initial cost. The same information must be broadcast to many locations. ...
Network and Systems - University of Glasgow
... Define the overheads wrt management, operation and security functions associated with deploying a network server Identify all network servers and establish their purpose, security requirements, user base and support staff Limit the exposure of network servers to those apps that are critical for thei ...
... Define the overheads wrt management, operation and security functions associated with deploying a network server Identify all network servers and establish their purpose, security requirements, user base and support staff Limit the exposure of network servers to those apps that are critical for thei ...
Hacking
... Once we have a target, we need to get to know it better. Methods: War Dialing (to find out modem access) Network Mapping Vulnerability Scanning War Driving ...
... Once we have a target, we need to get to know it better. Methods: War Dialing (to find out modem access) Network Mapping Vulnerability Scanning War Driving ...
NJR2 - 100 Delawanna Ave., Clifton, NJ
... NJR2 (100 Delawanna Ave.) is one of the most network-rich, interconnected colocation centers in the New York City metro area. Located just 11-miles outside of Manhattan, this 211,000 sq. ft. data center is an ideal location for financial services firms looking to run low-latency back office operatio ...
... NJR2 (100 Delawanna Ave.) is one of the most network-rich, interconnected colocation centers in the New York City metro area. Located just 11-miles outside of Manhattan, this 211,000 sq. ft. data center is an ideal location for financial services firms looking to run low-latency back office operatio ...
CSCI 1200 / ASSC 1000
... Network Operating System • functions for connecting computers & devices to a LAN. • must deal with multiple computers & coordinate things throughout the network. • today many operating systems have networking functions built in. ...
... Network Operating System • functions for connecting computers & devices to a LAN. • must deal with multiple computers & coordinate things throughout the network. • today many operating systems have networking functions built in. ...
How to Make Devices Communicate in a Wireless World
... Changing the Rules of the Road – How to Make Legacy Devices Communicate in A Wireless World The Ford Model T started rolling off the assembly line in 1908. If you’d purchased one you would have found yourself sharing the right of way with Stanley steam cars, battery-powered Baker coupes, horses and ...
... Changing the Rules of the Road – How to Make Legacy Devices Communicate in A Wireless World The Ford Model T started rolling off the assembly line in 1908. If you’d purchased one you would have found yourself sharing the right of way with Stanley steam cars, battery-powered Baker coupes, horses and ...
TeraMax™ Bridge
... at the client, and enhanced security comprising AES – provides TeraMax with much of the functionality of WiMAX today. • OFDM: enables communication near line of sight • Polling: by actively providing equal time to all clients in the network, the system prevents interference among nodes, and thus max ...
... at the client, and enhanced security comprising AES – provides TeraMax with much of the functionality of WiMAX today. • OFDM: enables communication near line of sight • Polling: by actively providing equal time to all clients in the network, the system prevents interference among nodes, and thus max ...
2512 - Networking
... Data can be backed up (1) without physically transporting it (1) Monitoring of bookings (1) so the office know what to advertise (1) ...
... Data can be backed up (1) without physically transporting it (1) Monitoring of bookings (1) so the office know what to advertise (1) ...
Chapter 6 slides, Computer Networking, 3rd edition
... host: must associate with an AP scans channels, listening for beacon frames containing AP’s name (SSID) and MAC address selects AP to associate with may perform authentication [Chapter 8] will typically run DHCP to get IP address in AP’s ...
... host: must associate with an AP scans channels, listening for beacon frames containing AP’s name (SSID) and MAC address selects AP to associate with may perform authentication [Chapter 8] will typically run DHCP to get IP address in AP’s ...
Networks
... Made up of one or more file servers and clients (any type of computer) Client software enables requests to be sent to the server Wired or wireless connections Do not slow down with heavy use ...
... Made up of one or more file servers and clients (any type of computer) Client software enables requests to be sent to the server Wired or wireless connections Do not slow down with heavy use ...
Some Tools for Computer Security Incident Response
... Nmap (Network Mapper) is a security scanner used to discover hosts and services on a computer network, thus creating a "map" of the network. To accomplish its goal, Nmap sends specially crafted packets to the target host and then analyzes the responses. Nmap accounts for the network conditions (late ...
... Nmap (Network Mapper) is a security scanner used to discover hosts and services on a computer network, thus creating a "map" of the network. To accomplish its goal, Nmap sends specially crafted packets to the target host and then analyzes the responses. Nmap accounts for the network conditions (late ...
File
... A firewall cannot prevent individual users with modems from dialing into or out of the network, bypassing the firewall altogether. If employee can do some mistakes so it can’t be controlled by firewall. the planning of any security policy but that cannot be solved with firewalls alone. ...
... A firewall cannot prevent individual users with modems from dialing into or out of the network, bypassing the firewall altogether. If employee can do some mistakes so it can’t be controlled by firewall. the planning of any security policy but that cannot be solved with firewalls alone. ...
13707579013302_CIS 202 TC,NW & WT-1
... radio signals to link two or more computers within a geographically limited area, generally one building or a group of buildings. A networked office building, school, or home usually contains a single LAN. The linked computers are called workstations. • Wide area network (WAN) A computer network tha ...
... radio signals to link two or more computers within a geographically limited area, generally one building or a group of buildings. A networked office building, school, or home usually contains a single LAN. The linked computers are called workstations. • Wide area network (WAN) A computer network tha ...
Trojan Horse
... 1. Scan the network to: • locate which IP addresses are in use, • what operating system is in use, • what TCP or UDP ports are “open” (being listened to by Servers). 2. Run “Exploit” scripts against open ports 3. Get access to Shell program which is “suid” (has “root” ...
... 1. Scan the network to: • locate which IP addresses are in use, • what operating system is in use, • what TCP or UDP ports are “open” (being listened to by Servers). 2. Run “Exploit” scripts against open ports 3. Get access to Shell program which is “suid” (has “root” ...
Security “Tidbits” - The Stanford University InfoLab
... What: just copied itself; did not touch data When date=time, “Twenty-two points, plus triple word score, plus fifty points for using all my letters. Game’s over. I’m outta here.” ...
... What: just copied itself; did not touch data When date=time, “Twenty-two points, plus triple word score, plus fifty points for using all my letters. Game’s over. I’m outta here.” ...
Security+ Guide to Network Security Fundamentals
... Router used to separate network from ISP’s network Identifies separation point between assets you control and those you do not Most insecure area of a network infrastructure Normally reserved for routers, firewalls, public Internet servers (HTTP, FTP, Gopher) Not for sensitive company information th ...
... Router used to separate network from ISP’s network Identifies separation point between assets you control and those you do not Most insecure area of a network infrastructure Normally reserved for routers, firewalls, public Internet servers (HTTP, FTP, Gopher) Not for sensitive company information th ...
Chap 11: Network Security Topologies
... Router used to separate network from ISP’s network Identifies separation point between assets you control and those you do not Most insecure area of a network infrastructure Normally reserved for routers, firewalls, public Internet servers (HTTP, FTP, Gopher) Not for sensitive company information th ...
... Router used to separate network from ISP’s network Identifies separation point between assets you control and those you do not Most insecure area of a network infrastructure Normally reserved for routers, firewalls, public Internet servers (HTTP, FTP, Gopher) Not for sensitive company information th ...
Security strategy
... All organisations suffer from breaches of security. These can range from innocent attempts to access restricted resources to deliberate and prolonged attempts on computer systems and networks. ...
... All organisations suffer from breaches of security. These can range from innocent attempts to access restricted resources to deliberate and prolonged attempts on computer systems and networks. ...
Wireless security
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.