... 192.168.3.1 [110/65] via 192.168.240.1, 00 Ngoài ra để xem " ;virtual link" bạCode: #sh ip ospf virtual- links Tóm lại : == virtual links phải được cấu hvùng trung chuyển (transit area)== ... " ;virtual link" trên Singapore và SanJose1 thông qua area 51 như một "vùng trung chuyển" (transit area) Code: SanJose1: ! router ospf 1 log-adjacency-changes area 51 virtual- link ... configuration : 1790 bytes ! Code: Singapore: ! router ospf 1 log-adjacency-changes area 51 virtual- link 192.168.1.3network 192.168.3.0 0.0.0.255 area 51network 192.168.224.0 0.0.0.255 area...
... Publishing as Pearson Addison-Wesley Function Libraries Predefined functions are found in librariesThe library must be “included” in a programto make the functions availableAn include directive ... Education, Inc. Publishing as Pearson Addison-WesleyPredefined Functions C++ comes with libraries of predefined functions Example: sqrt function the_root = sqrt(9.0); returns, or computes, ... that accompanies a function declaration?Describe what it means to say a programmer should be able to treat a function as a black box?Describe what it means for two functions to be black...
... Functions Each function should be tested as a separate unitTesting individual functions facilitates finding mistakes Driver programs allow testing of individual functions Once a function ... as Pearson Addison-WesleyRule for Testing Functions Fundamental Rule for Testing Functions Test every function in a program in which every other function in that program has already been ... Publishing as Pearson Addison-WesleyDisplay 5.1void -Function DefinitionTwo main differences between void -function definitions and the definitions of functions that return one valueKeyword void...
... Addison-WesleyDefining the Member Functions Member functions of a template class are definedthe same way as member functions of ordinaryclassesThe only difference is that the member function definitions ... functions index_of_smallest also uses a general algorithm andcould be defined with a template swap_values has already been adapted as a templateAll three functions, defined with templates, ... able to separate declaration and definitions of template functions just as you do with regular functions To be safe, place template function definitions in the same file where they are used…with...
... SUMMARYVPNs do not make use of dedicated leased linesVPNs send data through a secure tunnel that leads from one endpoint to another VPNs keep critical business communications private and secureVPN componentsVPN serversVPN clientsProtocols39TUNNELING PROTOCOLSLayer 2 Tunneling Protocol (L2TP)Provides better security through IPSecIPSec enables L2TP to performAuthenticationEncapsulationEncryption18TUNNELING PROTOCOLSSecure Shell (SSH)Provides authentication and encryptionWorks with UNIXbased systemsVersions for Windows are also availableUses publickey cryptographySocks V. 5Provides proxy services for applications That do not usually support proxyingSocks version 5 adds encrypted authentication and support for UDP2016ENCRYPTION SCHEMES USED BY VPNS (CONTINUED)Secure Sockets Layer (SSL) (continued)StepsServer uses its private key to decode premaster codeGenerates a master secret keyClient and server use it to generate session keysServer and client exchange messages saying handshake is completedSSL session begins34SUMMARY (CONTINUED)VPN typesSitetositeClienttositeEncapsulation encloses one packet within another Conceals the original informationVPN protocolsSecure Shell (SSH)Socks version 5PointtoPoint Tunneling Protocol (PPTP)Layer 2 Tunneling Protocol (L2TP)40 Virtual Private Network (VPN) 29BIếN ĐổI ĐÓNG GÓI TRONG VPN (ENCAPSULATION)Các buớc trong tiến trình VPN Đóng gói (Encapsulation)Mã hoá (Encryption)Xác thực (Authentication)EncapsulationĐóng gói dữ liệu và các thông số khác nhauVí dụ như IP headerBảo vệ tính nguyên vẹn dữ liệu153127VPN CORE ACTIVITY 2: ENCRYPTIONEncryptionProcess of rendering information unreadable by all but the intended recipientComponentsKeyDigital certificateCertification Authority (CA)Key exchange methodsSymmetric cryptographyAsymmetric cryptographyInternet Key ExchangeFWZ2812SUMMARY (CONTINUED)IPSec/IKEEncryption makes the contents of the packet unreadableAuthentication ensures participating computers are authorized usersKerberos: strong authentication systemVPN advantagesHigh level of security at low costVPN disadvantagesCan introduce serious security risks412410255ENCRYPTION SCHEMES USED BY VPNSTriple Data Encryption Standard (3DES)Used by many VPN hardware and software3DES is a variation on Data Encryption Standard (DES)DES is not secure3DES is more secureThree separate 64bit keys to process data3DES requires more computer resources than DES30WHY ESTABLISH A VPN?VPN combinationsCombining VPN hardware with software adds layers of network securityOne useful combination is a VPN bundled with a firewallVPNs do not eliminate the need for firewallsProvide flexibility and versatility13FIREWALL CONFIGURATION FOR VPNS37Protocol...
... antihypertensive medicationand lung function. Cigarette smoking is a common riskfactor for both impaired lung function and high bloodpressure and BMI might have an effect on lung function. However, adjustment ... lung function. Nevertheless, this study hassome possible limitation. Methodological bias mightlead to insufficient lung function measurements. Thusin patients with high blood pressure lung function ... bloodpressure, its treatment and lung function. Several pro-spective studies indicated that high blood pressure is arisk factor for reduced lung function as well as impairedlung function increases the risk...
... ép (Overtopped). 7 ỨNG DỤNG HÀM TÁCH BIỆT (DISCRIMINANT FUNCTION) ĐỂ PHÂN LOẠI CẤP SINH TRƯỞNG CÂY RỪNG THE USE OF DISCRIMINANT FUNCTION IN TREE GROWTH GRADING Nguyễn Văn Thêm Khoa Lâm ... nhiều nhà lâm học quan tâm. Bài báo này giới thiệu kết quả ứng dụng hàm tách biệt (Discriminant Function) để phân cấp sinh trưởng cây rừng dựa trên ba nhân tố định lượng là đường kính thân cây, ... Bảng 4. Các hệ số của hàm phân loại hợp quy chuẩn hoá (Standardized Canonical Discriminant Function Coefficients) Hàm hợp quy chuẩn hoá Biến dự đoán 1 2 3 D1.3, cm 0,961 - 0,387 - 0,238...
... hành bằng cách nhấn chuột phải vào My Computer > Properties > Advanced > Advanced > Virtual memory > Change.Có thể trò choi đó chiếm quá nhiều bộ nhớ RAM. Hiện nay, với WinXP,...
... or the old yet useful odd-man-out activity.34SailsBoatGunwaleII. METONYMYII.1. Linguistic functions of metonymy Among the substitutive figures of speech, metonymy is probably the most frequently ... language teaching, should contain recognizable examples illustrating these figures’ linguistic functions. They should be creative figures so as to highlight stylistic differences between uses ... better.32FOODmeaCHAPTER II SOME SIGNIFICANT SUBSTITUTIVE FIGURES OF SPEECH IN POETRYI. SYNECDOCHEI.1. Linguistic functions of synecdocheAn adult native speaker of English may not remember how many times in his/her...
... quản trịISAS name: Virtual Network Private (VPN)Page 8Class name – NIIT Hai PhongISAS name: Virtual Network Private (VPN)Page 23Class name – NIIT Hai PhongISAS name: Virtual Network Private ... sách an toàn mạng1.6.3. Chính sách an toàn Mạng riêng ảoISAS name: Virtual Network Private (VPN)Page 2ISAS ReportIsas name: Virtual Network private (VPN)Coordinator: Mr. Nguyen VAN A2011Student ... có thể mở rộng và phát triển khi công việc kinh ISAS name: Virtual Network Private (VPN)Page 5Class name – NIIT Hai PhongISAS name: Virtual Network Private (VPN)Page 24Class name – NIIT Hai...