... 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 PrivateNetwork (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 ... 1723TUNNELING PROTOCOLSPointtoPoint Tunneling Protocol (PPTP)Used when you need to dial in to a server with a modem connectionOn a computer using an older OS versionEncapsulates TCP/IP packetsHeader contains only information needed to route data from the VPN client to the serverUses Microsoft PointtoPoint Encryption (MPPE)Encrypt data that passes between the remote computer and the remote access serverL2TP uses IPSec encryptionMore secure and widely supported17NỘI DUNGNguyên lý VPNCác biến đổi đóng gói trong VPNsMã hoá trong VPNsXác thực trong VPNsƯu nhược điểm của VPNs2VPN CORE ACTIVITY 3: AUTHENTICATIONAuthenticationIdentifying a user or computer as authorized to access and use network resourcesTypes of authentication methods used in VPNsIPSecMSCHAPBoth computers exchange authentication packets and authenticate one anotherVPNs use digital certificates to authenticate users35 ... 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 PrivateNetwork (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...
... - In LuËn v¨n, TiÓu luËn : 6.280.688Lý thuyết. I. Tổng quan về mạng riêng ảo VPN (Virtual Private Network) . II. VPN và bảo mật internet VPN. III. Thiết kế VPNI. Tổng quan về mạng riêng ... tiết kiệm được chi phí và thời gian. VPN ra đời đáp ứng tất cả các yêu cầu trênCụm từ VirtualPrivateNetwork gọi là mạng riêng ảo- VPN được khởi sự năm 1997.Mục đích mong muốn của công nghệ ... nào dựa trên PPTP triển khai ít nhất 3 thành phần, các thành phần đó là : - PPTP client - NetworkAccess Server (NAS) - PPTP server23CH sè 11 - B1 - §H KTQD Chuyªn Photocopy - §¸nh m¸y -...
... hai loại phổ biến hiện nay là VPN truy cập từ xa (Remote -Access )và VPN điểm-nối-điểm (site-to-site).1. VPN Remote Access - Remote Access VPNs cho phép truy cập bất cứ lúc nào bằng Remote,mobile, ... tunnel về mạng của họ.I. Giới Thiệu VPN1. Khái niệm- Mạng riêng ảo hay VPN (viết tắt cho VirtualPrivate Network) là mộtmạng dành riêng để kết nối các máy tính của các công ty, tập đoàn hay các ... lại đóng vai_________________________________________________________________________ VIRTUAL PRIVATENETWORK (VPN)Nhóm 18Lớp: DHTH3GV: Th.s Nguyễn HòaDanh sách:1. Đặng Hồng Hải2. Hồ Thanh...
... Thí nghiệm TTDL & Mạng máy tính Trang 55 9. Nhấn Next. Trên trang Network Connection, chọn VirtualPrivateNetwork connection. 10. Nhấn Next. Trên trang Connection Name, gõ VPN Client ... and Remote Access nhấn vào Remote Access Policies nhấn chuột phải vào Connections to Microsoft Routing and Remote Access server chọn Properties. Trên thẻ Setting chọn Grant remote access permission. ... Routing and Remote Access Server Setup nhấn Finish Tiếp theo ta cấu hình giao diện quay số yêu cầu 1. Trên Routing and Remote Access chọn SIM01 và nhấn chuột phải vào network Interface...
... services to keep your network safe. However, most modern VPNsystems are combined with firewalls in a single device. Virtual Private Networking Explained Virtual Private Networks solve the problem ... gain local access to the laptop,and discovers that it is automatically connecting to a remote network via IPSec. This provides thehacker remote access to the private network, so he uses network ... of LAN communications, including file and print access, LANe mail, Remote Procedure Calls, and client/server database access. − Virtual Private Networks between LANs can be established using server...
... 3For more restrictive access to the network, NAP can be set up to restrict or limit access to the private network, while permitting access to a restricted area of the network, and automatically ... health policy. Then, private network access will be granted.Four Features of NetworkAccess Protection1. Health Policy ValidationWhen a user attempts to connect to a network, the computer’s ... net-work access and communication. Network Access Protections is also known as a network quarantine platform from Microsoft that isolates acomputer that might be a danger to your network until...
... segments or between the privatenetwork and public networks. Placing Routers Within the PrivateNetwork You need to place routers within the privatenetwork so that: The network traffic is isolated ... and Remote Access filters restrict: Internet access to privatenetwork resources, such as servers. Private network user access to Internet-based resources, such as partner networks or ... Internet, and other privatenetwork locations. Restricting the traffic enables you to limit user access between privatenetwork segments, and limit Internet user access to privatenetwork segments....
... permit others access, or restrict oneor more users from accessing a specific website. Define access restrictions with the access- listcommand, and use the access- group command to bind the access- list ... 3 Controlling NetworkAccess and UseSimplifying Access Control with Object Grouping Configuring Network Object GroupsThis section describes the commands required to configure a network object ... 7(Optional) Use the show access- list command to display the expanded access list entries:pix(config)# show access- list access- list acl permit tcp host 201.165.201.1 host 1.1.1.1 access- list acl permit...
... public internetwork in a manner that emulates the properties of a point-to-point private link.The act of configuring and creating a virtualprivatenetwork is known as virtual private networking. ... the internetwork appears to the user as a privatenetwork communication—despite the fact that this communication occurs over a public internetwork—hence the name virtualprivate network. VPN ... creation of VPNs from anywhere, networks needstrong security features to prevent unwelcome access to private networks and to protect private data as it traverses the public network. User authentication...
... Next để tiếp tụcBước 2: Chạy VZACCESS MANAGER SETUP WIZARDKích Start để chuyển tới menu VZAccess Manager để bắt đầu chương trình VZAccess Manager.Lần đầu tiên VZAccess Manager chạy, Setup Wizard ... CardChạy VZAccess Manager (nếu chưa được khởi động). Cửa sổ ứng dụng VZAccess Manager sẽ được hiển thị. Chọn một trong số những kết nối sau: "NationalAccess", "NationalAccess - ... phần mềm VZAccess Manager vào, một số lựa chọn được hiển thị. Tại thời điểm này, bạn có thể tiếp tục cài đặt hoặc thoát cài đặt VZAccess Manager. Nếu bạn không có đĩa CD phần mềm VZAccess Manager,...
... between the L2TP Network Server (LNS), and the L2TP Access Concentrator (LAC). The LNStypically runs on a network gateway such as a router, while the LAC can be a dial-up Network Access Server ... Client OverviewRemote access VPN users employing the Cisco VPN 3000 Client version 2.5/2.6, or the Cisco VPNClient version 3.x, can now securely access their private enterprise network through the ... 14Create an access list that defines the PIX Firewall network( s) requiring IPSec protection: access- list 90 permit ip 10.0.0.0 255.255.255.0 10.1.1.0 255.255.255.0Step 15Bind the access list...
... trên enforcement client. Những gì NetworkAccess Protection không thể thực hiện được là ở chỗ, nó không thể tránh được các kẻ xâm phạm bừa bãi vào mạng. NetworkAccess Protection chỉ bảo đảm rằng ... các tổ chức, tuy nhiên lại không thay thế được các cơ chế bảo mật khác mà bạn đang sử dụng. NetworkAccess Protection không thỏa mãn được sự hài lòng trong trường hợp bảo đảm các máy khách từ ... các máy trạm đang được sử dụng cho việc truy cập từ xa có đủ các tiêu chuẩn. Chính vì vậy, NetworkAccess Protection sẽ chỉ ngăn được hacker nếu máy tính không thỏa mãn chính sách an ninh mạng...