MAC Part I - UCLA Computer Science
... Slotted ALOHA requires slot synchronization A simpler version, pure ALOHA, does not require slots A node transmits without awaiting for the beginning of a slot Collision probability increases (packet can collide with packets transmitted in a “vulnerable” window twice as large as in S-Aloha) Throughp ...
... Slotted ALOHA requires slot synchronization A simpler version, pure ALOHA, does not require slots A node transmits without awaiting for the beginning of a slot Collision probability increases (packet can collide with packets transmitted in a “vulnerable” window twice as large as in S-Aloha) Throughp ...
LP-N24 - LanPro
... network. The default value is 1460. Do NOT modify it unless necessary. But if when some specific website or web application software cannot be open or enabled, have a try to change the MTU value as 1450, 1400, etc. ...
... network. The default value is 1460. Do NOT modify it unless necessary. But if when some specific website or web application software cannot be open or enabled, have a try to change the MTU value as 1450, 1400, etc. ...
BOOTP Packet Format - Texas Tech University
... IP address determined to be remote – ARP resolves the address of each router on the way – Router uses ARP to forward packet ...
... IP address determined to be remote – ARP resolves the address of each router on the way – Router uses ARP to forward packet ...
networks: communicating and sharing resources
... In packet switching, an outgoing message is divided into data units of a fixed size, called packets. Each packet is numbered and addressed to the destination computer. The sending computer pushes the packets onto the network, where routers examine the packets. Routers are devices that examine each p ...
... In packet switching, an outgoing message is divided into data units of a fixed size, called packets. Each packet is numbered and addressed to the destination computer. The sending computer pushes the packets onto the network, where routers examine the packets. Routers are devices that examine each p ...
Lecture-13: LTE Architecture - University of Colorado Boulder
... – Maps to specific QoS parameters such as data rate, delay, and packet error rate ...
... – Maps to specific QoS parameters such as data rate, delay, and packet error rate ...
Slide 1
... Majority of the time Telos: 2.4mA MicaZ: 30mA As quickly as possible to process and return to sleep Telos: 290ns typical, 6ms max MicaZ: 60ms max internal oscillator, 4ms external ...
... Majority of the time Telos: 2.4mA MicaZ: 30mA As quickly as possible to process and return to sleep Telos: 290ns typical, 6ms max MicaZ: 60ms max internal oscillator, 4ms external ...
Security Product Roadmap
... All slides must be shown in its entirety, including the D-Link’s logo and brand name, without any modification or deletion, unless with the written consent of D-Link. Individual slides may be removed in its entirety. Background colour may be changed. Printed copies can be distributed freely for the ...
... All slides must be shown in its entirety, including the D-Link’s logo and brand name, without any modification or deletion, unless with the written consent of D-Link. Individual slides may be removed in its entirety. Background colour may be changed. Printed copies can be distributed freely for the ...
gsc11_gtsc4_30 NGN E2E QoS - Docbox
... • TR-30.3 recently completed ANSI/TIA-921, “Network Model for Evaluating Multimedia Transmission Performance Over Internet Protocol” – This new standard is in the publication cycle – Undergone over two years of work to ensure that the model accurately depicts how IP networks behave • Model’s charact ...
... • TR-30.3 recently completed ANSI/TIA-921, “Network Model for Evaluating Multimedia Transmission Performance Over Internet Protocol” – This new standard is in the publication cycle – Undergone over two years of work to ensure that the model accurately depicts how IP networks behave • Model’s charact ...
Introduction to Networking
... ▸ As multiple segments are connected to a central bus, the network depends heavily on the bus. Its failure affects the entire network. ▸ Owing to its size and complexity, maintenance is not easy and costs are high. Also, configuration is difficult in comparison to that in other topologies. ▸ Though ...
... ▸ As multiple segments are connected to a central bus, the network depends heavily on the bus. Its failure affects the entire network. ▸ Owing to its size and complexity, maintenance is not easy and costs are high. Also, configuration is difficult in comparison to that in other topologies. ▸ Though ...
Go Wireless with Redpine and Renesas Wi-Fi Solutions
... Modules Offered with Renesas Electronics Platforms ...
... Modules Offered with Renesas Electronics Platforms ...
ICND -1 Interconnecting Cisco Networking
... networks (WLANs) defined in the 802.11b standard. WEP is designed to provide the same level of security as that of a wired LAN. LANs are inherently more secure than WLANs because LANs are somewhat protected by the physicalities of their structure, having some or all part of the network inside a buil ...
... networks (WLANs) defined in the 802.11b standard. WEP is designed to provide the same level of security as that of a wired LAN. LANs are inherently more secure than WLANs because LANs are somewhat protected by the physicalities of their structure, having some or all part of the network inside a buil ...
CISSP CBK #2 Access Control
... (permissions accumulate over time even if you don’t need them anymore) • Auditing authorization can help mitigate this. SOX requires yearly auditing. ...
... (permissions accumulate over time even if you don’t need them anymore) • Auditing authorization can help mitigate this. SOX requires yearly auditing. ...
The Vision and Reality of Ubiquitous Computing
... highly technical parameters, with differing names inconsistent conventions for user and realm made worse by limited end systems (configure by multi-tap) usually fails with some cryptic error message and no indication which parameter out-of-box experience not good ...
... highly technical parameters, with differing names inconsistent conventions for user and realm made worse by limited end systems (configure by multi-tap) usually fails with some cryptic error message and no indication which parameter out-of-box experience not good ...
GN2211621167
... Vol. 2, Issue 2,Mar-Apr 2012, pp.1162-1167 provision of adequate QoS support when deployed in theWMN. Network providers who look atWMNs as a cheap alternative to expand their existing wireless network infrastructure without incurring exorbitant deployment costs also look at WMNs as a viable alternat ...
... Vol. 2, Issue 2,Mar-Apr 2012, pp.1162-1167 provision of adequate QoS support when deployed in theWMN. Network providers who look atWMNs as a cheap alternative to expand their existing wireless network infrastructure without incurring exorbitant deployment costs also look at WMNs as a viable alternat ...
Broad Band-TTC notes
... the same twisted two-wire facility (called the subscriber loop) as the traditional telephone service. The traditional telephone service is often referred to as “Plain Old Telephone Service” or POTS. With the initial system architecture and design of ADSL, the same twisted pair could simultaneously s ...
... the same twisted two-wire facility (called the subscriber loop) as the traditional telephone service. The traditional telephone service is often referred to as “Plain Old Telephone Service” or POTS. With the initial system architecture and design of ADSL, the same twisted pair could simultaneously s ...
Technology in Action
... All devices are connected to your router, either wirelessly or with a wired connection. Wired connections deliver better throughput than wireless. To add ports to your network, you can connect a switch to your router. Network-attached storage (NAS) devices let you store and share data files such as ...
... All devices are connected to your router, either wirelessly or with a wired connection. Wired connections deliver better throughput than wireless. To add ports to your network, you can connect a switch to your router. Network-attached storage (NAS) devices let you store and share data files such as ...
Technology in Action
... All devices are connected to your router, either wirelessly or with a wired connection. Wired connections deliver better throughput than wireless. To add ports to your network, you can connect a switch to your router. Network-attached storage (NAS) devices let you store and share data files such as ...
... All devices are connected to your router, either wirelessly or with a wired connection. Wired connections deliver better throughput than wireless. To add ports to your network, you can connect a switch to your router. Network-attached storage (NAS) devices let you store and share data files such as ...
LECTURE 10
... A MS in 802.11 can be associated with only one AP When the MS sends a reassociation request and obtains an association frame, the new AP sends an IAPP-MOVE-notify packet to the old AP ¤ The old AP address is obtained from the registration service ¤ If the registration service cannot be located, the ...
... A MS in 802.11 can be associated with only one AP When the MS sends a reassociation request and obtains an association frame, the new AP sends an IAPP-MOVE-notify packet to the old AP ¤ The old AP address is obtained from the registration service ¤ If the registration service cannot be located, the ...
ch05
... each other wirelessly over short distances Communicates at speeds of up to 1 Mbps within a range of up to 33 feet (10 meters) Can connect devices to a computer network using access points like Wi-Fi Bluetooth and Wi-Fi Compete in some areas, but have unique qualities ...
... each other wirelessly over short distances Communicates at speeds of up to 1 Mbps within a range of up to 33 feet (10 meters) Can connect devices to a computer network using access points like Wi-Fi Bluetooth and Wi-Fi Compete in some areas, but have unique qualities ...
The Medium Access Sublayer
... of presumed root, cost to root. Each bridges starts by believing it is root. • If you get superior information on your presumed root ...
... of presumed root, cost to root. Each bridges starts by believing it is root. • If you get superior information on your presumed root ...
Operating System Security Rules
... as the administration account will force the hacker to find another legitimate username. Do not delete the system account since it may be needed by various system functions. Finding a legitimate username may not be difficult because most companies use very similar username naming conventions (e.g., ...
... as the administration account will force the hacker to find another legitimate username. Do not delete the system account since it may be needed by various system functions. Finding a legitimate username may not be difficult because most companies use very similar username naming conventions (e.g., ...
Using Nessus to Detect Wireless Access Points
... In some organizational environments, users might add a wireless access point to their network in order to free their laptops and computers from a network cable. In the process of doing this, the users may be not only circumventing organizational security po ...
... In some organizational environments, users might add a wireless access point to their network in order to free their laptops and computers from a network cable. In the process of doing this, the users may be not only circumventing organizational security po ...
Discovering Computers 2008
... Communications Devices What are ISDN and DSL modems? Communications devices that send and receive digital ISDN and DSL signals Usually external devices in which one end connects to a telephone line and the other end connects to a port on the system unit ...
... Communications Devices What are ISDN and DSL modems? Communications devices that send and receive digital ISDN and DSL signals Usually external devices in which one end connects to a telephone line and the other end connects to a port on the system unit ...
投影片 1
... Packet Filter Firewalls Access control based upon several pieces of information contained in a network packet: The source address of the packet The destination address of the packet The type of traffic: the specific network protocol being used to communicate between the source and destina ...
... Packet Filter Firewalls Access control based upon several pieces of information contained in a network packet: The source address of the packet The destination address of the packet The type of traffic: the specific network protocol being used to communicate between the source and destina ...
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.