storage area networks sans

Ngày tải lên: 25/07/2014, 08:20

... centralized storage, each server is connected to a separate storage device This can result in multiple storage devices with some being under utilized while others are near capacity With storage area networks, ... existing storage resources Essentially, a storage area network will transfer network storage from a file server to a network separate from the local area network (LAN) Walder (2002, What is the Storage ... mission-critical applications Storage area networks help with these problems even as freeing up network capacity by doing backups and writing to disk quietly behind the scenes Storage area networks allow Information...

Ngày tải lên: 14/02/2014, 16:20

... Objectives • Describe a wireless personal area network (WPAN) • List the different WPAN standards and their applications • Explain how IrDA, ... Describe the security features of low-rate WPAN technology What is a WPAN? • Wireless personal area network (WPAN) – Group of technologies that are designed for shortrange communications – Eliminates...

Ngày tải lên: 13/09/2012, 10:52

... Objectives • Define a high rate wireless personal area network (HR WPAN) • List the different HR WPAN standards and their applications • Explain how ... 802.15.3 Network Topology • Piconet coordinator (PNC) – Role assumed by the first device in the area – Provides all of the basic communications timing in a piconet – PNC sends a beacon • The piconet ... the coverage of a piconet – Neighbor piconets • Allow coexistence with other piconets in the same area Wireless# Guide to Wireless Communications 14 802.15.3 Network Topology (continued) Wireless#...

Ngày tải lên: 13/09/2012, 10:52

... modes of a WLAN WLAN Applications • Wireless networks are increasing in popularity • Installing cabling is inconvenient and very expensive – Wireless networks solve this problem • With a wireless ... wireless clients and an AP • Extended Service Set (ESS) – Two or more BSS wireless networks installed in same area – Provides users with uninterrupted mobile access to the network • All wireless ... wireless technology that attracts the most attention today – Radio frequency (RF) wireless local area networks (WLANs) • Wireless NIC performs same functions as wired NIC • Access points parts –...

Ngày tải lên: 13/09/2012, 10:52

... Wireless metropolitan area networks (WMANs) – Provide wireless connectivity across a substantial geographical area such as a large city • WMANs primary goals – Extend wired networks beyond a single ... Objectives • Explain why wireless metropolitan area networks (WMANs) are needed • Describe the components and modes of operation of a WMAN • List ... high-speed cable-based connections – Extend user mobility throughout a metropolitan area – Provide high-speed connections to areas not serviced by any other method of connectivity Last Mile Wired Connections...

Ngày tải lên: 13/09/2012, 10:52

... Objectives • Describe wireless wide area networks (WWANs) and how they are used • Describe the applications that can be used on a digital ... telephone networks (continued) – Transmitters and cell phones operate at low power • Enables the signal to stay confined to the cell • Signal at a specific frequency does not go far beyond the cell area ... devices 39 Geosynchronous Earth Orbit (GEO) (continued) 40 Summary • In cellular telephone networks, the coverage area is divided into sections called cells • Cellular technology generations – – – –...

Ngày tải lên: 13/09/2012, 10:52

... Braley R C and Heile R F Paving the Way for Personal Area Network Standards: an Overview of the IEEE P802.15 Working Group for Wireless Personal Area Networks, IEEE Personal Communications, February, ... possible applications can be very large In the following we outline a representative set: Personal Area Networks (PANs) 303 † Personal device synchronization Automatic data synchronization between ... service discovery layer runs the Service Discovery Prototcol (SDP), which is used in Personal Area Networks (PANs) † † † † 305 order for a Bluetooth device to learn about services on offer and...

Ngày tải lên: 29/09/2013, 21:20

... link devices that operate in the uncabled area to the organization’s wired network This application area of WLANs is referred to as LAN extension Another area of WLAN application is nomadic access ... Security is another area of concern in WLANs Radio signals may propagate beyond the geographical area of an organization All a potential intruder has to is to approach the WLAN operating area and with ... fast and reliable way Effect of propagation delay A typical coverage area for WLANs can be up to 150 300 m Wireless Local Area Networks 247 in diameter The effect of propagation delay can be significant,...

Ngày tải lên: 29/09/2013, 21:20

... /?Issue=34&IssueDate=04-01-2001&CP= 11/06/01 CertificationZone Page 17 of 17 l Define the term "Virtual Local Area Network" or "VLAN" l Describe the benefits of implementing VLANs l Configure VLANs using Cisco...

Ngày tải lên: 19/10/2013, 02:15

... and improving response time As is also true of GTS, FRTS can eliminate bottlenecks in Frame Relay networks that have high-speed connections at the central site and low-speed connections at branch...

Ngày tải lên: 11/12/2013, 14:15

... 67 Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01 iii Ethernet Access for Next Generation Metro and Wide Area Networks Introduction Scope This document provides design ... and Wide Area Networks 30 OL-14760-01 Design Considerations • Use of EIGRP stub areas eliminates queries to spoke routers • OSPF must periodically synchronize router databases within an area, while ... public networks such as the Internet If split-tunnel is not enabled at the branch location, it is questionable whether firewall needs to Ethernet Access for Next Generation Metro and Wide Area Networks...

Ngày tải lên: 21/12/2013, 06:15

... The Case for Virtual Local Area Networks (VLANs) Ted Rohling, Global Knowledge Instructor, CISSP Introduction In the history ... Coaxial Cable-Based Ethernet To simplify the installation of Ethernet networks, a change was made to the network topology Networks were converted from coaxial cable to twisted pair cabling by ... subnet In most practical networks, all devices in a small business or enterprise network are not located on the same Ethernet network broadcast domain We separate the networks to limit broadcast...

Ngày tải lên: 17/01/2014, 06:20

Ngày tải lên: 19/01/2014, 05:20

Ngày tải lên: 25/01/2014, 06:24

... PERSONAL AREA NETWORKS 1.4.2 IEEE 802.11 MAC The IEEE 802.11 protocol (O’Hara and Petrick 1999) is, strictly speaking, intended for wireless local area networks (LANs), rather than wireless ad hoc networks ... Kinds of Ad Hoc Networks Recently, new families of wireless ad hoc networks for specialized applications have emerged, most notably sensor and personal area networks Wireless sensor networks, or ... 1.6 Sensor Networks Sensor networks are a class of wireless networks intended for monitoring environmental phenomena in a given physical space; such networks find increasing use in areas as diverse...

Ngày tải lên: 25/03/2014, 12:14

... Wireless Ad Hoc Networking: Personal -Area, Local -Area, and the Sensory -Area Networks Shih-Lin Wu and Yu-Chee Tseng ISBN: 0-8493-9254-3 Wireless Metropolitan Area Networks: WiMAX and Beyond Yan Zhang ... Data Wireless ad hoc networking : personal area, local area, and the sensory area networks / editors, Shih‑Lin Wu and Yu‑Chee Tseng p cm ‑‑ (Wireless networks and mobile communications) Includes ... 1-800-374-3401 E-mail: orders@crcpress.com WIRELESS AD HOC NETWORKING Personal -Area, Local -Area, and the Sensory -Area Networks Edited by Shih-Lin Wu Yu-Chee Tseng Boca Raton New York Auerbach Publications...

Ngày tải lên: 01/06/2014, 11:10

... METROPOLITAN AREA NETWORKS • • • • • • 13.1 Giới Thiệu Định Nghĩa MAN 13.2 Thiết Kế Phương Pháp Tiếp Cận 13.3 Mạng ... IEEE 802,15 Chuẩn IEEE 802.15 thường gọi mạng khu vực cá nhân không dây WPAN (wireless personal area network) 6/18/14 14 13.5 Tiêu chuẩn IEEE 802,15 • • 6/18/14 Một WPAN xem bong bóng thông tin...

Ngày tải lên: 18/06/2014, 22:16

... model for UWB multisensor multiantenna body area networks IEEE Trans Antennas Propagation 58(1), 163–170 (2010) P Gupta, PR Kumar, The capacity of wireless networks IEEE Trans Inf Theory 46(2), 388–404 ... Energy comparison and optimization of wireless body -area network technologies, in Proceedings of the ICST 2nd International Conference on Body Area Networks (BodyNets ‘07), Florence, Italy (2007) ... Wireless Networks (Nova Science Pub Inc., Hauppauge, 2008) A Jain, E Chang, Adaptive sampling for sensor networks, in Proceedings of the 1st International Workshop on Data Management for Sensor Networks, ...

Ngày tải lên: 20/06/2014, 22:20

... Mandayam, Transmission-Opportunity Exchange for Cooperative Bandwith Allocation in Wireless Local Area Networks IEICE Technical Report, MoMuC2010-3, 13–18 (May 2010) T Nishio, R Shinkuma, T Takahashi, ... as: Nishio et al.: TCP-based window-size delegation method for TXOP Exchange in wireless local area networks EURASIP Journal on Wireless Communications and Networking 2011 2011:58 Submit your manuscript ... method does not require any modifications of the APs or the legacy STAs and is applicable to access networks other than WLANs since it is based on end-to-end TCP-level controls )rehtO( C ATS )redivorP(...

Ngày tải lên: 21/06/2014, 01:20