... Nhằm dùng để logon vào Handler software (user + password) Turn On Kích hoạt Handler sẵn sàng nhận lệnh Log Off Nhằm dùng để Logoff khỏi Handler software Turn Off Chỉ dẫn Handler ngưng hoạt động, ... PUSH +ACK SYN Attack IP @ Attack IP Packet Options Attack Spoof source Attack Spoof source Attack Spoof source Attack Loop Attack Spoof source Attack I/ Những kiểu công làm cạn kiệt băng thông ... Agent, Client Handler Client : software sở để hacker điều khiển hoạt động attack-network Handler : thành phần software trung gian Agent Client Agent : thành phần software thực công mục tiêu,...
... trị offset riêng truyền theo nhiều đường khác để tới đích Tại đích, nhờ vào giá trị offset gói tin mà liệu lại kết hợp lại ban đầu •Lợi dụng điều này, hacker tạo nhiều gói tin có giá trị offset ... hiểm - Quá trình gửi thư điện tử mà file đính kèm dài 256 ký tự xảy trình tràn nhớ đệm c.Ping of death : - Kẻ công gửi gói tin IP lớn số lương bytes cho phép tin IP 65.536 bytes - Quá trình...
... kết nối tới x-windows port .C.4 Cố ý sử dụng UDP SERVICES dễ use UDP services (như echo, time, datetime, chargen) lặp lại cách liên tục nhờ IPspoofing thông thường Vd: from-IP=127.0.0.1 to-IP=system.we.attack ... host bị ảnh hưởng lớn biện pháp cài đặt finger ko hỗ trợ chuyển tiếp GNU finger, or bạn tắt finger service .C.2 UDP AND SUNOS 4.1.3 sunOS 4.1.3 bị lỗi boot bạn gởi tới packet với thông tin sai header ... Buffer cache: cache Inode làm tắc nghẽn gián tiếp I/O đĩa thực .B.7 INETD inetd bị crashed, tất service khác qua inetd ko làm việc .C ATTACK TỪ BÊN NGOÀI .C.1 Sự thuận lợi Finger hầu hết prog...
... TABLE 2.1 Selected Ways of Classifying Services degree of tangibility or intangibility ofservice processes direct recipient of the service process place and time ofservice delivery customization ... customer's perceptions ofservice quality 14 Customers often judge the quality of the service they receive largely on their assessment of the people providing the service Successful service firms devote ... Underlying such failures is often a lack of understanding of some of the key principles ofservice marketing and management Technological change affects many other types of services, too, from airfreight...
... Fast Retransmit o Probability p of choosing a given flow is proportional to the rate of the flow l more packets of that flow, higher probability of choosing one of its packets Queue Management ... control the rate and burst size l – example : nbr of customers in D/D/1 vs G/D/1 – traffic description o Service contract if the network knows the type of the traffic, it can reserve resources to support ... Alternative to Marking and Policing: allocate a set portion of bandwidth to each application flow; can lead to inefficient use of bandwidth if one of the flows does not use its allocation o PRINCIPLE...
... Dimension ofService Workers’ Job Satisfaction: The Perspective of Flight Attendants fects service workers’ job satisfaction There is a paucity of research on the social dimension ofservice workers’ ... JSSM The Social Dimension ofService Workers’ Job Satisfaction: The Perspective of Flight Attendants one of the critical factors of job satisfaction One of the purposes of this study is to investigate ... Measure of Sampling Adequacy) value was 0.93 The result of Bartlett test of sphericity resulted in the p-value of 0.000 Table shows the result of exploratory factor analysis for the variable of job...
... classes ofservice You can base policies on IP addresses, port numbers, protocols, or the size of packets You can use one of these descriptors to create a simple policy, or you can use all of them ... use the CID to index its table of stored session contexts 139 cRTP can compress the 40 bytes of header down to to bytes most of the time As such, about 98 percent of the time the compressed packet ... is not covered in this book.) Some of the problems QoS cannot solve are propagation delay (no solution to the speed -of- light problem exists as of the printing of this book), codec delay, sampling...
... reflects the Quality ofService from the viewpoints of the application and user The focus of the thesis is on the influence of the network on the applicationperceived Quality ofService and thus the ... QoS as “the collective effect ofservice performance, which determines the degree of satisfaction of a user of a service. ” Others, e.g [6], define QoS as “a collection of technologies which allow ... UE Uu BS Iub RNC Iu CN End-to-End Service UMTS Bearer Service Radio Access Bearer Service Radio Bearer Service UTRA Service Iu Bearer Service Physical Bearer Service Figure 2.6: UTRAN architecture...
... hỏng nặng • Qua ta thấy rõ vụ công từ chối dịch vụ (Denial Of Services Attack ) công việc gửi nhửng gói liệu tới máy chủ (Flood Data Of Services Attack) tới tấp mối lo sợ cho nhiều mạng máy tính ... công từ chối dịch vụ có nhiều dạng Ping of Death, Teardrop, Aland Attack, Winnuke, Smurf Attack, UDP/ICMP Flooding, TCP/SYN Flooding, Attack DNS Ping Of Death Một số máy tính bị ngưng họat động,...
... giá trị offset riêng truyền theo nhiều đường để tới đích Tại đích, nhờ vào giá trị offset gói tin mà liệu lại kết hợp lại ban đầu Lợi dụng điều này, hacker tạo nhiều gói tin có giá trị offset ... tài nguyên mạng máy tính khác mạng 3)Sử dụng băng thông: Tấn công kiểu DDoS (Distributed Denial of Service) : cách thức công nguy hiểm Hacker xâm nhập vào hệ thống máy tính, cài đặt chương trình...
... Quality ofService Improving GradeofService (GOS) While Reducing RF Channels Wireless service providers are adopting new deployment strategies to reduce network costs and improve quality ofservice ... or more of the total number of RF channels required on a multiple link transport system for a specified amount of user gradeofservice The percentage reduction depended on the number of radiating ... network What determines “reasonable access” is the designated gradeofservice (GOS), which is the acceptable amount of network blocking of incoming call attempts Typical wireless network designs...
... sorted into various types ofservice at the basic perimeter of the network and that those types ofservice should be implemented in the core of the network Routers in the core of the network can then ... result of this association is called a service policy A service policy contains three elements: a name, a traffic class (specified with the class command), and the QoS policies The purpose of the service ... Resource Reservation Protocol (RSVP) flow Methods of classification were once limited to use of the contents of the packet header Today's methods of marking a packet with its classification allow...
... Objectives Upon completion of this module, you will be able to perform the following tasks: • Explain the significance of Quality ofService (QoS) • Describe new Quality ofService (QoS) features ... database access • Tailored services—If you are an Internet Service Provider (ISP), the control and visibility provided by QoS enables you to offer carefully tailored grades ofservice differentiation ... layers This could be a view of a large Enterprise network or a view of a Service Provider network This graphic introduces some of the basic terminology and concepts of QoS in the next slides Copyright...
... giá trị offset riêng truyền theo nhiều đường để tới đích Tại đích, nhờ vào giá trị offset gói tin mà liệu lại kết hợp lại ban đầu Lợi dụng điều này, hacker tạo nhiều gói tin có giá trị offset ... tài nguyên mạng máy tính khác mạng 3)Sử dụng băng thông: Tấn công kiểu DDoS (Distributed Denial of Service) : cách thức công nguy hiểm Hacker xâm nhập vào hệ thống máy tính, cài đặt chương trình...
... Value perspective the measurement ofservice quality in the service sector should take into account customer expectations ofservice as well as perceptions ofservice However, as Robinson (1999) ... understanding of customer expectations between managers and service providers A Shahin Word of mouth Communications Personal needs Past experience Expected service Gap5 Consumer Gap6 Perceived serviceService ... Employee perceptions of consumer expectation Translation of perceptions into service quality specifications Gap2 Gap7 Management perceptions of consumer expectations Figure Model ofservice quality...
... Winnuke, Smurf Attack, UDP/ICMP Flooding, TCP/SYN Flooding, Attack DNS Ping Of Death Một số máy tính bị ngưng họat động, Reboot bị crash bị nhận gói liệu ping có kích thước...