ICMP message transport

Lecture Computer networks: Lesson 33 - Hammad Khalid Khan. The main topics covered in this chapter include: ICMP message transport, using ICMP to test reachability, using ICMP to trace a route, the last address printed by traceroute, using ICMP for path MTU discovery,...

10p youzhangjing_1909 28-04-2022 11 2   Download

Port scanners, such as nmap8 (see Appendix B for more information), first identify active hosts in the address range specified by the user using Transport Control Protocol/Internet Protocol (TCP/IP) Internet Control Message Protocol (ICMP) ECHO and ICMP ECHO_REPLY packets. Once active hosts have been identified, they are scanned for open TCP and User Datagram Protocol (UDP) ports 9 that will then identify the network services operating on that host.

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lập kết nối giữa 2 hostApplication Presentation Session Transport Network Data link PhysicalTẦNG MẠNG VS TẦNG VẬN CHUYỂNVí dụ: A gởi B 1 bức thư qua đường bưu điện ¢ processes = A, B ¢ app messages = bức thư ¢ hosts = nhà của A, nhà của B Dựa trên, mở rộng dịch vụ ¢ transport protocol ??? của tầng mạng ¢ network-layer protocol

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