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Networking Support For Mobile Computing
... satellites, a trend to support "computing on the move" has emerged. This trend is known as mobile computing or “anytime” and “anywhere” computing. Some people refer it as “Nomadic” computing. No matter which name is applied, all these terms really imply that a user may not maintain a fixed position ...
... satellites, a trend to support "computing on the move" has emerged. This trend is known as mobile computing or “anytime” and “anywhere” computing. Some people refer it as “Nomadic” computing. No matter which name is applied, all these terms really imply that a user may not maintain a fixed position ...
CNS Review - University of California San Diego
... today that, when combined with the prevalence of highspeed Internet access, can give attackers multiple tens of Gb/s of attack capacity • Moreover, core networks are oversubscribed (e.g. some core routers in Abilene have more than 30 Gb/s incoming traffic from access networks, but only 20 Gb/s of ou ...
... today that, when combined with the prevalence of highspeed Internet access, can give attackers multiple tens of Gb/s of attack capacity • Moreover, core networks are oversubscribed (e.g. some core routers in Abilene have more than 30 Gb/s incoming traffic from access networks, but only 20 Gb/s of ou ...
NETWORKING AND DATA COMMUNICATION
... LAN is the smallest size of network & it normally covers an area within the radius of 10M – 3 Km. LAN is usually owned by one organization. However, one LAN can be connected to other LANs over any distance via data transmission lines or wireless media. A LAN connects several Personal Computers to a ...
... LAN is the smallest size of network & it normally covers an area within the radius of 10M – 3 Km. LAN is usually owned by one organization. However, one LAN can be connected to other LANs over any distance via data transmission lines or wireless media. A LAN connects several Personal Computers to a ...
Dynamic Host Configuration Protocol
... administrators manage centrally and automate the assignment of Internet Protocol addresses in an organization’s network. (basically it frees a network administrator from having to manually configure each host connected to his network) ...
... administrators manage centrally and automate the assignment of Internet Protocol addresses in an organization’s network. (basically it frees a network administrator from having to manually configure each host connected to his network) ...
ppt - Suraj @ LUMS
... A router sends a link state advertisement to the designated router only using 224.0.0.6 “all designated routers” multicast address If advertisement is new, designated router floods the link state on all its interfaces (including the network on which it is received!) using 224.0.0.5 “all OSPF routers ...
... A router sends a link state advertisement to the designated router only using 224.0.0.6 “all designated routers” multicast address If advertisement is new, designated router floods the link state on all its interfaces (including the network on which it is received!) using 224.0.0.5 “all OSPF routers ...
OSPF - Suraj @ LUMS
... A router sends a link state advertisement to the designated router only using 224.0.0.6 “all designated routers” multicast address If advertisement is new, designated router floods the link state on all its interfaces (including the network on which it is received!) using 224.0.0.5 “all OSPF routers ...
... A router sends a link state advertisement to the designated router only using 224.0.0.6 “all designated routers” multicast address If advertisement is new, designated router floods the link state on all its interfaces (including the network on which it is received!) using 224.0.0.5 “all OSPF routers ...
NetScreen-Remote VPN and Security Client Software
... secure, mobile access to private networks has caused network security administrators to place additional requirements on client software. Remote access clients must now provide secure authentication and VPN policy retrieval while remaining easy to deploy and seamless to end users. The software must ...
... secure, mobile access to private networks has caused network security administrators to place additional requirements on client software. Remote access clients must now provide secure authentication and VPN policy retrieval while remaining easy to deploy and seamless to end users. The software must ...
Y-Comm: A new architecture for heterogeneous networking
... – The mobile node can know or estimate the network state at a given point before it arrives at that point – Proactive Policies allow us to maximize the use of available channels provided you know the amount of time a channel will be available. – That time is known as: • Time before vertical handover ...
... – The mobile node can know or estimate the network state at a given point before it arrives at that point – Proactive Policies allow us to maximize the use of available channels provided you know the amount of time a channel will be available. – That time is known as: • Time before vertical handover ...
Chapter 1. Introduction to Data Communications
... – Uses Lightweight Directory Service Protocol (LDAP) to interact with client computers Copyright 2010 John Wiley & Sons, Inc ...
... – Uses Lightweight Directory Service Protocol (LDAP) to interact with client computers Copyright 2010 John Wiley & Sons, Inc ...
Slides
... • E.g. Embedded devices that can’t login and need network access Traffic from Internet host B is always possible from any local host and is never accounted, but local host IP speed limits are ...
... • E.g. Embedded devices that can’t login and need network access Traffic from Internet host B is always possible from any local host and is never accounted, but local host IP speed limits are ...
Detecting and Preventing Rogue Devices on the Network
... clients are up almost all the time, doing site survey on clients and collecting data in a central server was adequate. ...
... clients are up almost all the time, doing site survey on clients and collecting data in a central server was adequate. ...
Power Consumption and Maximizing Network Lifetime during
... number of randomly deployed nodes over an area, we illustrate that a simple local optimization scheme executed at each node guarantees strong connectivity of the entire network and attains the global minimum energy solution for stationary networks. Due to its localized nature, this protocol proves t ...
... number of randomly deployed nodes over an area, we illustrate that a simple local optimization scheme executed at each node guarantees strong connectivity of the entire network and attains the global minimum energy solution for stationary networks. Due to its localized nature, this protocol proves t ...
Guide to Operating System Security
... Programs that replicate on the same computer or send themselves to many other computers Can open a back door ...
... Programs that replicate on the same computer or send themselves to many other computers Can open a back door ...
RIP V2
... RIP routes (routes for networks within the RIP routing domain) from "external" RIP routes, which may have been imported from an EGP or another IGP Routers supporting protocols other than RIP should be configurable to allow the Route Tag to be configured for routes imported from ...
... RIP routes (routes for networks within the RIP routing domain) from "external" RIP routes, which may have been imported from an EGP or another IGP Routers supporting protocols other than RIP should be configurable to allow the Route Tag to be configured for routes imported from ...
An Introduction to Cellular Security Joshua Franklin
... – This is a very common, yet is complex, process ...
... – This is a very common, yet is complex, process ...
Problem Statement
... – Currently: IP outside certain region cannot access some P2P streaming (by policy) or has a bad performance • Limit or wrong knowledge on out of scope IP addresses ...
... – Currently: IP outside certain region cannot access some P2P streaming (by policy) or has a bad performance • Limit or wrong knowledge on out of scope IP addresses ...
Transport Control Protocol (TCP) & Applications
... • TCP views data as an unstructured but ordered stream of bytes => assembled into segments • Sequence number for a segment is the byte-stream number of the segment’s first data byte • The receiver notes the number of the last segment that arrived in sequence and stores additional out of order segmen ...
... • TCP views data as an unstructured but ordered stream of bytes => assembled into segments • Sequence number for a segment is the byte-stream number of the segment’s first data byte • The receiver notes the number of the last segment that arrived in sequence and stores additional out of order segmen ...
Airmesh The Flying Mesh Network
... In the practical part we built a prototype of the mesh network with three routers and used it to evaluate our theoretical work on range and bandwidth limits. We also built a tool to configure the routers fast and easy. This tool was not only useful for us during the experiments but will also be usef ...
... In the practical part we built a prototype of the mesh network with three routers and used it to evaluate our theoretical work on range and bandwidth limits. We also built a tool to configure the routers fast and easy. This tool was not only useful for us during the experiments but will also be usef ...
DHCP/NAT/IPv6
... NAT: Network Address Translation Motivation: local network uses just one IP address as ...
... NAT: Network Address Translation Motivation: local network uses just one IP address as ...
Slide 1
... elements (specialized computers, known as router) that connect three or more transmission lines. ...
... elements (specialized computers, known as router) that connect three or more transmission lines. ...
Slide 1
... 4.3 User Agent Role – continued 4.3.4 Sending Cookies to the Origin server When the user agent sends a request to an origin server, the user agent includes a Cookie request header if it has applicable cookies, based on: ► the request-host (defined earlier) – Domain Selection ...
... 4.3 User Agent Role – continued 4.3.4 Sending Cookies to the Origin server When the user agent sends a request to an origin server, the user agent includes a Cookie request header if it has applicable cookies, based on: ► the request-host (defined earlier) – Domain Selection ...
Survey on Routing Protocol in Wireless Sensor Network
... Wireless sensor networks is widely considered as one of the most important technologies. WSN has provided a small and low cost sensor node with the capability of sensing various types of environmental phenomena and wireless communication [5,14]. In most WSN application, sensor nodes are deployed in ...
... Wireless sensor networks is widely considered as one of the most important technologies. WSN has provided a small and low cost sensor node with the capability of sensing various types of environmental phenomena and wireless communication [5,14]. In most WSN application, sensor nodes are deployed in ...
network
... routers have one buffer per outgoing link => store packets that the router is about to send into the link If arrival rate (in bits) to link exceeds transmission rate of link for a period of time: packets will queue, wait to be transmitted on link packets can be dropped (lost) if memory (buffer) ...
... routers have one buffer per outgoing link => store packets that the router is about to send into the link If arrival rate (in bits) to link exceeds transmission rate of link for a period of time: packets will queue, wait to be transmitted on link packets can be dropped (lost) if memory (buffer) ...
Wireless security
![](https://commons.wikimedia.org/wiki/Special:FilePath/ADSL_router_with_Wi-Fi_(802.11_b-g).jpg?width=300)
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.