phy mac and network layers

... standard obtained by the basic power control protocol in the static network and the SNAPdMac protocol in both static and mobile networks Note that, thanks to PHY (power level adjustment) and MAC ... received versus time; static network Simulations and Results 6.1 Random Network with Optimistic Traffic 10 SNAPdMac 08Coll35 SNAPdMac Coll35 SNAPdMac Coll25 “STD” “SNAPdMac” Figure 4: Number of collisions ... DCF standard, basic power control protocol, and SNAPdMac protocol The tuning of the SNAPdMac protocol has been investigated as can be observed in the figure The SNAPdMac Coll25 and SNAPdMac Coll35...

Ngày tải lên: 21/06/2014, 22:20

... PUs and SUs in the same frequency bands brings the challenges for both physical (PHY) and medium access control (MAC) protocol design in CRN As compared with the traditional networks, PUs and ... coexistence of SUs and PUs at the same frequency bands brings the challenges for the protocol design of the secondary network on both physical (PHY) layer and medium access control (MAC) layer In ... radio networks (CRN) and aim to improve the spectrum sensing performance at the PHY layer and to solve the access contention problem at the MAC layer Thus, the performance of the secondary network...

Ngày tải lên: 10/09/2015, 15:53

... box until all dirt and rough lines that may have scanned in disappear and the line art looks how you’d like it to be Click the Move and Transform tab and resize, reposition, and rotate your image ... is above all the other Image Layers (if it isn’t already), click the layer in the Layers palette and drag it to the top of the Image Layers list (just before the Layers header) You now have a ... Filling a section with All Layers off and on Unfilled shapes Shapes filled with the All Layers check box deselected Shapes filled with the All Layers check box selected (8-bit layers only) To change...

Ngày tải lên: 27/08/2012, 14:31

... Xerox Corp Standardized in 1980 as IEEE 802.3 CSMA/CD algorithm is same for both Ethernet and 802.3 Frame format differs between Ethernet and 802.3 Frame format differs between Ethernet and 802.11 ... administer access to the medium and to provide MAC layer reliability Management frames perform supervisory functions such as joining/ leaving a wireless network and move associations from AP to ... the Virtual Carrier-Sensing indicates the medium is idle and the station can transmit q For the station to transmit both the physical and virtual carrier sense must report an idle condition otherwise...

Ngày tải lên: 13/09/2012, 11:16

... Describe the tools used to attack Web servers  Hands-On Ethical Hacking and Network Defense Hands-On Ethical Hacking and Network Defense UNDERSTANDING WEB APPLICATIONS  It is nearly impossible to write a program without bugs ... Close the recordset and the connection 27 UNDERSTANDING WEB  APPLICATION VULNERABILITIES Many platforms and programming languages can  be used to design a Web site  Application security is as important as network ... Standard database access method developed by  the SQL Access Group  ODBC interface allows an application to access  Data stored in a database management system  Any system that understands and can issue ODBC ...

Ngày tải lên: 17/09/2012, 10:44

... years and how this will influence radio bandwidth and network topology We define bandwidth quality in terms of application bandwidth, processor bandwidth, memory bandwidth, radio bandwidth, and network ... AMPS/ETACS handset, base station, and network design in the early to mid-1980s; programs on GSM handset, base station, and network design from the late 1980s to mid-1990s onward; and, more recently, ... involved or wanting to be involved in 3G handset or 3G network design Over the next 20 chapters, we study handset hardware, handset software, network hardware, and network software A Brief Overview of...

Ngày tải lên: 20/08/2013, 14:10

... kiếm nhiều tiền Network Marketing không? Cái hay Network Marketing chỗ có Bạn trả lời câu hỏi Ngược lại với nhiều loại hình công việc mà người khác người định tiền lương Bạn, Network Marketing ... đồng tiền kiếm Network marketing đồng tiền xương máu cần phải hiểu rõ điều bước vào kinh doanh 17 Những người tham gia Network Marketing thành công kiếm tiền? Nhũng người tham gia Network Marketing ... thiệu chúng cho Bạn bè Bạn Cách bán tốt Network Marketing không cố bán Nếu nói đến ý tưởng mà “tự bán nó” Network Marketing ý tưởng Khi Bạn nói với người khác Network Marketing, Bạn nhớ đến điều...

Ngày tải lên: 27/08/2013, 08:19

... architectureDatabase and Instance Complete understanding of physical and logical database storage concepts Managing datastorage, loading and reorganization Managing roles, privileges, password and resources ... resources Understanding of backup and recovery options Archiving redo log files and hot backups Using Recovery Manager (RMAN) to perform backup and recovery operations Creating and managing Standby database ... configure and manage the main network components and network configuration of the server Chapter 14 covers client side configuration You will learn about the main network components and configuration...

Ngày tải lên: 18/10/2013, 18:15

... layer and computer networks, security, and network management ISBN 0-13141098-9 AND DATA COMMUNICATIONS TECHNOLOGY NETWORK SECURITY ESSENTIALS, FOURTH EDITION A tutorial and survey on network ... 12.4 Security of MACs 374 12.5 MACs Based on Hash Functions: HMAC 375 12.6 MACs Based on Block Ciphers: DAA and CMAC 380 12.7 Authenticated Encryption: CCM and GCM 383 12.8 Pseudorandom Number Generation ... protect data and resources from disclosure, to guarantee the authenticity of data and messages, and to protect systems from network- based attacks Second, the disciplines of cryptography and network...

Ngày tải lên: 07/12/2013, 11:53

... between network administrators in the New York and Chicago offices Network Manages the day-to-day operations of administrator, the New York and Boston networks New York New York Installs and manages ... Each office uses a standard user account and password for all servers in that office Network administrators in each office know the user account and password combination Network administrators ... Pars Regional network Sydney Manages and maintains user and computer accounts for administrator, the Sydney office Sydney The existing network infrastructure is shown in the Existing Network Infrastructure...

Ngày tải lên: 11/12/2013, 14:15

... interconnectedness in the theory of network effects and externalities is across people and markets The theory of network effects and 38 Chapter Consumer Choice and Demand in Traditional and Network Markets 39 ... the short-term demand curve 16 Chapter Consumer Choice and Demand in Traditional and Network Markets Changes in Demand The determinants of the elasticity of demand are fewer and easier to identify ... Chapter Consumer Choice and Demand in Traditional and Network Markets 34 Lagged Demands and Network Externalities Almost all microeconomics textbook what we have done with demand, they provide a...

Ngày tải lên: 17/12/2013, 15:18

... Monitor, printer, Input Devices : Keyboard, Mouse, Multi-Media (CD-ROM, Sound,…) Communication (Network, I/O Port, ) Mối quan hệ khối II THÀNH PHẦN VẬT LÝ CPU - Central Processing Unit Giới thiệu ... – Các loại : Sound card / Micro / HeadPhone 7 Communication Devices – Các cổng I/O : LPT, COM, Network Interface, Modem, Router ADSL Main Board (Mother Board) – – – Vai trò MB : liên kết – phối...

Ngày tải lên: 23/12/2013, 04:18

... same network viewing your network traffic Because a VPN does this, it is very effective in improving security on wireless networks (“Wireless Security and VPN,” 2001) Step 5: Measure and Report Network ... Nmap (“Nmap Network Mapping Software,” 2003) can be used to classify machines by operating system and the network services they are running These tools work by scanning your network and looking ... “lock” the door and provide better protection for that computer and its contents Traditional network design has focused on creating a secure network perimeter around the organization and strategically...

Ngày tải lên: 14/02/2014, 16:20

... 526 Cryptography and Network Security Principles and Practices, Fourth Edition • Table of Contents • Index Cryptography and Network Security Principles and Practices, Fourth Edition ... in use today / 526 Cryptography and Network Security Principles and Practices, Fourth Edition • Table of Contents • Index Cryptography and Network Security Principles and Practices, Fourth Edition ... Section A.2 Internet Standards and the Internet Society 649 Section A.3 National Institute of Standards and Technology 652 Appendix B Projects for Teaching Cryptography and Network Security 653...

Ngày tải lên: 18/02/2014, 08:20

Ngày tải lên: 24/02/2014, 04:20

... created the Internet and why • How the Internet is designed and how it works • Poor security on the Internet and the reasons for it • Internet warfare as it relates to individuals and networks In short, ... listing in this book The people (and companies) who replied are all qualified security vendors and consultants These vendors and individuals provide security products and services every day Many deal ... published in Dr Dobb's Journal The article was titled Randomness and the Netscape Browser by Ian Goldberg and David Wagner In it, Goldberg and Wagner explain that Netscape's implementation of a...

Ngày tải lên: 05/03/2014, 21:20

... Systems and Network Security Know your IT support providers and their role in information security All faculty, staff, and students on campus have access to IT support staff Know who they are and ... Systems and Network Security Use up-to-date protections against malicious software Install the University provided anti-virus and anti-spyware tools and keep them up to date Anti-virus and anti-spyware ... PR.01 - Systems and Network Security 15 Implement additional security requirements for portable or handheld, and wireless devices Wireless devices (including laptops, smartphones and PDA’s) must...

Ngày tải lên: 05/03/2014, 23:20

... Computer and Network Security: Questions Everyone Should Ask Computer and Network Security: Questions Everyone Should Ask A guide for discussion among business administrators and their information ... computers to store and retrieve records and we conduct online transactions over building, campus and Internet network connections Information technology yields great efficiencies and analytical power; ... spyware detection software on our servers and on end user computers? Page Computer and Network Security: Questions Everyone Should Ask • How are servers and end-user computers given new antivirus...

Ngày tải lên: 05/03/2014, 23:20