saving private ryan movie critique

... Saving Private Ryan Movie Critique Saving Private Ryan is a fairly new World War 2 movie, which is ablockbuster hit. It’s about a private named Ryan who lost three of ... colorful for a reason Colorful movies usually represent anaction movie or a love story. Some kind of movie that has little point orjust to make money. Saving Private Ryan colors weren’t as sharpbecause ... what made this movie greatand one oft the kind. The time period was during World War 2 and it wasfilmed during World War 2 or it seemed.The camera movement in Saving Private Ryan made you feel...

... Critique of Romeo and Juliet the Movie There have been many romantic films made in the past as wellas now in thepresent, ... morefantasy-like.Because of the setting, the deaths of the people in this movie did not seem asmoving as to the old movies. For some reason, the setting ofMercutio's deathinterfered with ... laughing. Perhaps thatwas why it was so difficult to follow the movie with all thosedistractions.What was quite remarkable about this movie was how thedirectorincorporated today's problems...

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... Virtual Private Network (VPN) VPN CONCEPTSVirtual Private Network (VPN) giải quyết các vấn đề:Tạo liên kết an toàn trên kênh truyền dữ liệu không an toànMã hoá dữ liệu trên kênh truyền3ENCRYPTION SCHEMES USED BY VPNSTriple Data Encryption Standard (3DES)Used by many VPN hardware and software3DES is a variation on Data Encryption Standard (DES)DES is not secure3DES is more secureThree separate 64­bit keys to process data3DES requires more computer resources than DES301031WHY ESTABLISH A VPN?Hardware versus software VPNsSoftware­based VPNsIntegrated with firewallsAppropriate when participating networks use different routers and firewallsBenefitsMore cost­effectiveOffer maximum flexibility11VPN CORE ACTIVITY 3: AUTHENTICATIONAuthenticationIdentifying a user or computer as authorized to access and use network resourcesTypes of authentication methods used in VPNsIPSecMS­CHAPBoth computers exchange authentication packets and authenticate one anotherVPNs use digital certificates to authenticate users351236WHY ESTABLISH A VPN?VPN combinationsCombining VPN hardware with software adds layers of network securityOne useful combination is a VPN bundled with a firewallVPNs do not eliminate the need for firewallsProvide flexibility and versatility13FIREWALL CONFIGURATION FOR VPNS37Protocol ... 1723WHY ESTABLISH A VPN?VPN combinations (continued)Points to consider when selecting VPNsCompatibilityScalabilitySecurityCostVendor support14ADVANTAGES AND DISADVANTAGES OF VPNS38BIếN ĐổI ĐÓNG GÓI TRONG VPN (ENCAPSULATION)Các buớc trong tiến trình VPN Đóng gói (Encapsulation)Mã hoá (Encryption)Xác thực (Authentication)EncapsulationĐóng gói dữ liệu và các thông số khác nhauVí dụ như IP headerBảo vệ tính nguyên vẹn dữ liệu15SUMMARYVPNs do not make use of dedicated leased linesVPNs send data through a secure tunnel that leads from one endpoint to another VPNs keep critical business communications private and secureVPN componentsVPN serversVPN clientsProtocols3916WHAT VPNS AREVPNKết nối logic ảo Tạo kết nối an toàn trên kênh InternetSecure tunnelTạo liên kết tổ chức logic giữa các side Đầu cuối của VPNsSpecified computers, users, or network gateways4TUNNELING PROTOCOLSPoint­to­Point Tunneling Protocol (PPTP)Used when you need to dial in to a server with a modem connectionOn a computer using an older OS versionEncapsulates TCP/IP packetsHeader contains only information needed to route data from the VPN client to the serverUses Microsoft Point­to­Point Encryption (MPPE)Encrypt data that passes between the remote computer and the remote access serverL2TP uses IPSec encryptionMore secure and widely supported17SUMMARY (CONTINUED)VPN typesSite­to­siteClient­to­siteEncapsulation encloses one packet within another Conceals the original informationVPN protocolsSecure Shell (SSH)Socks version 5Point­to­Point Tunneling Protocol (PPTP)Layer 2 Tunneling Protocol (L2TP)40TUNNELING PROTOCOLSLayer 2 Tunneling Protocol (L2TP)Provides better security through IPSecIPSec enables L2TP to performAuthenticationEncapsulationEncryption18SUMMARY (CONTINUED)IPSec/IKEEncryption makes the contents of the packet unreadableAuthentication ensures participating computers are authorized usersKerberos: strong authentication systemVPN advantagesHigh level of security at low costVPN disadvantagesCan introduce serious security risks41195NỘI DUNGNguyên lý VPNCác biến đổi đóng gói trong VPNsMã hoá trong VPNsXác thực trong VPNsƯu nhược điểm của VPNs2...

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