network managerment

Network Managerment

... managerof exceptional event Network Management 9-17SNMP protocol: message formats Network Management 9-2Chapter 9: Network ManagementChapter goals: ❒introduction to network management❍motivation❍major ... Reserved Network Management 9-5Infrastructure for network managementagentdataagentdataagentdataagentdatamanaged devicemanaged devicemanaged devicemanaged devicemanagingentitydata network managementprotocoldefinitions:managed ... IP routes.” REVISION “019331000Z” ………::= {mib-2 48} Network Management 9-4What is network management?❒autonomous systems (aka network ): 100s or 1000s of interacting hardware/software...

Báo cáo Giới thiệu về SNMP (Simple Network Managerment Protocol).

Danh mục: Quản trị mạng

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Tài liệu về LAN NETWORK

Danh mục: Quản trị mạng

...

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Tổng quan về NAT (Network Address Translation)

Danh mục: Quản trị mạng

... cả các DNS data đã được relay bởi NAT Phần I:Giới thiệu tổng quan về NAT (Network Address Translation) I : NAT (Network Address Translation) là gì ?NAT giống như một router, nó chuyển tiếp ... truy tìm chỉ IP thì hoàn toàn không hiệu quả. Đó là trong các ứng dụng virtual server và virtual network bởi vì traffic được sinh ra bởi một IP thì không thể nào phân chia được nữa. Khi chúng ... thế cho nhiều host thật sự (real server) . Chúng ta cũng có thể tạo ra kết nối mạng ảo (virtual network) gồm nhiều mạch thật sự (real wire) dùng kỹ thuật virtual server. Chúng ta có thể làm điều...

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ORACLE NETWORK CONFIGURATION

Danh mục: Quản trị mạng

... TRẢ LỜI BÀI TẬP ORACLECHƯƠNG 26ORACLE VÀ CẤU HÌNH MẠNG (ORACLE NETWORK CONFIGURATION)1. Listener là gì? Cáùc Service chính nào được dùng để phục cho việc truy...

Network Layer

Danh mục: Kỹ thuật lập trình

... linkphysical network data linkphysical network data linkphysical network data linkphysical network data linkphysical network data linkphysical network data linkphysicalapplicationtransport network data linkphysicalapplicationtransport network data ... link Network Layer 4-11 Network layer connection and connection-less service❒datagram network provides network- layer connectionless service❒VC network provides network- layer connection ... layer❒ network layer protocols in every host, router❒Router examines header fields in all IP datagrams passing through it network data linkphysical network data linkphysical network data...

Network Security

Danh mục: Kỹ thuật lập trình

... KA-KDC(A,B)KA-KDC(R1, KB-KDC(A,R1) ) 8: Network Security8-2Chapter 8: Network SecurityChapter goals: ❒understand principles of network security: ❍cryptography and its many uses ... All Rights ReservedComputer Networking: A Top Down Approach Featuring the Internet, 3rd edition. Jim Kurose, Keith RossAddison-Wesley, July 2004. 8: Network Security8-47Key Distribution ... createa packet “spoofing”Alice’s address“I am Alice”Alice’s IP address 8: Network Security8-1Chapter 8 Network SecurityA note on the use of these ppt slides:We’re making these slides...

Windown 2003 network security

Danh mục: Hệ điều hành

... Topic 3GWindown 2003 network securityTrong chủ đề này, bạn sẽ xem xét các tác động của biến bật / tắt các giao thức NetBIOS trên một máy Windown 2003.NetBIOS là viết tắt của Network Basic Input ... spooled để tăng tốc độ in ấn.17. Chọn Keep Printed Documents, và click OK.18. Nhấp đôi chuột vào My Network Places.19. Nhấp đôi chuột vào Computers Near Me.20. Nhấp đôi chuột vào printer server...

Network Procedures

Danh mục: Kĩ thuật Viễn thông

... network (serving network) to a terrestrial network orvice versa due to one of the reasons identiﬁed during the handover initiation phase.Handovers involved in two different but integrated networks ... networks. In designing a satellite network, the needfor inter-FES handover should be kept to a minimum.Integrated Satellite-Terrestrial Network Scenario In an integrated network, an on-goingcall may ... For a group usage terminal, accessto the network may still be maintained so that other users registered on this terminal can stillaccess the network. Network Procedures 235required. The path...

Network Management Quản trị hệ thống mạng

Danh mục: Quản trị mạng

... Introduction to Networking Management3. Simple Network Management Protocol4. Network Security5. Outsourcing the Network I – Cloud Computing & SaaS6. Outsourcing the Network II – Green ... 10% (PF) + 50% (FE) • Sinh viên đậu khóa học khi: Tổng điểm ≥ 5 vàThi cuối môn học ≥ 5 (of 10) Network ManagementQuản trị hệ thống mạngVũ Trí Dũngdungvt@uit.edu.vnTài liệu tham khảo• Dùng ... Cloud Computing & SaaS6. Outsourcing the Network II – Green IT and SAN7. Managing Wireless Networks...

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The network layer Addressing and routing

Danh mục: Kỹ thuật lập trình

... supposed that 2 IP sub -network share physically the same LAN. The stations on eachsub -network then will see circulating all the packets diffused on the physic network. 1The network layerAddressing ... rentallease)7- Engineers network link: 2B-14-62-91-C9-B1- Engineers network link towards the external router: 2B-14-62-3F-39-21- Commercial network link: 1C-96-AA-F4-C2-91- Commercial network link towards ... 194.12.230.140.1. Propose a mask of sub -network for the network of company.194.12.230.0 is a Class C address, the last byte must be used to encode the numbers ofsub -network and the numbers of hosts...

Securing the Network Infrastructure

Danh mục: Kỹ thuật lập trình

... many false alarms Network Monitoring and Diagnostic Devices•SNMP enables network administrators to:–Monitor network performance–Find and solve network problems–Plan for network growth•Managed ... and network equipment –Can be used independently of the network and can have their own applications installed•Server: computer on a network dedicated to managing and controlling the network •Basic ... information and infecting the network Hardening Network Security Devices•The final category of network devices includes those designed and used strictly to protect the network •Include:–Firewalls–Intrusion-detection...

Outsourcing the Network II - Green IT and SAN

Danh mục: Kỹ thuật lập trình

... giữa sáng kiến và hiệu quả của nóSAN solutionHợp nhất việc lưu trữ•SAN (Storage Area Network) và NAS (Network Attached Storage) là hai cách để tổ chức lại một hệ thống vào trong một nguồn ... chủ thông qua một card adapter, và thiết bị lưu trữ chỉ phục vụ cho một server duy nhất•NAS (network attached storage): là một dạng mạng LAN cơ bản chạy trên máy chủ file server sử dụng giao...

NETWORK SECURITY

Danh mục: Quản trị mạng

... Header checksumSource AddressDestination AddressOptionsDataAN TOÀN DỮ LIỆU TRÊN ĐƯỜNG TRUYỀN Network Security Course9m m’Trudy♦Making data un-readable by protocol analyzers and other “man-in-the-middle” methods on the network. AliceBobBÀI TẬP 4Sau khi dùng Sniffing software để bắt thông tin phân tích gói thông tin gửi đi từ host AGói 1: Protocol ... description0 0 echo reply (ping)3 0 dest. network unreachable3 1 dest host unreachable3 2 dest protocol unreachable3 3 dest port unreachable3 6 dest network unknown3 7 dest host unknown4 ... nhập6. Kỹ Thuật Mã hóa7. Hệ thống xác thực8. Virtual Private Networks9. Kỹ Thuật tấn công10. Luật, chính sách an toàn thông tin11 Network Security CourseCƠ BẢN VỀ AN NINH MẠNG CƠ BẢN VỀ AN NINH MẠNG Các...

Virtual Private Network (VPN)

Danh mục: Kỹ thuật lập trình

... SUMMARY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Protocols39TUNNELING PROTOCOLSLayer 2 Tunneling Protocol (L2TP)Provides better security through IPSecIPSec enables L2TP to performAuthenticationEncapsulationEncryption18TUNNELING PROTOCOLSSecure Shell (SSH)Provides authentication and encryptionWorks with UNIXbased systemsVersions for Windows are also availableUses publickey cryptographySocks V. 5Provides proxy services for applications That do not usually support proxyingSocks version 5 adds encrypted authentication and support for UDP2016ENCRYPTION SCHEMES USED BY VPNS (CONTINUED)Secure Sockets Layer (SSL) (continued)StepsServer uses its private key to decode premaster codeGenerates a master secret keyClient and server use it to generate session keysServer and client exchange messages saying handshake is completedSSL session begins34SUMMARY (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)40Virtual 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)EncapsulationĐóng gói dữ liệu và các thông số khác nhauVí dụ như IP headerBảo vệ tính nguyên vẹn dữ liệu153127VPN CORE ACTIVITY 2: ENCRYPTIONEncryptionProcess of rendering information unreadable by all but the intended recipientComponentsKeyDigital certificateCertification Authority (CA)Key exchange methodsSymmetric cryptographyAsymmetric cryptographyInternet Key ExchangeFWZ2812SUMMARY (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 risks412410255ENCRYPTION 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 DES30WHY 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 ... SUMMARY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Protocols39TUNNELING PROTOCOLSLayer 2 Tunneling Protocol (L2TP)Provides better security through IPSecIPSec enables L2TP to performAuthenticationEncapsulationEncryption18TUNNELING PROTOCOLSSecure Shell (SSH)Provides authentication and encryptionWorks with UNIXbased systemsVersions for Windows are also availableUses publickey cryptographySocks V. 5Provides proxy services for applications That do not usually support proxyingSocks version 5 adds encrypted authentication and support for UDP2016ENCRYPTION SCHEMES USED BY VPNS (CONTINUED)Secure Sockets Layer (SSL) (continued)StepsServer uses its private key to decode premaster codeGenerates a master secret keyClient and server use it to generate session keysServer and client exchange messages saying handshake is completedSSL session begins34SUMMARY (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)40Virtual 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)EncapsulationĐóng gói dữ liệu và các thông số khác nhauVí dụ như IP headerBảo vệ tính nguyên vẹn dữ liệu153127VPN CORE ACTIVITY 2: ENCRYPTIONEncryptionProcess of rendering information unreadable by all but the intended recipientComponentsKeyDigital certificateCertification Authority (CA)Key exchange methodsSymmetric cryptographyAsymmetric cryptographyInternet Key ExchangeFWZ2812SUMMARY (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 risks412410255ENCRYPTION 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 DES30WHY 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 ... 1723TUNNELING 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 supported17NỘI DUNGNguyên lý VPNCác biến đổi đóng gói trong VPNsMã hoá trong VPNsXác thực trong VPNsƯu nhược điểm của VPNs2VPN 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 users35...