clip_image002 clip_image004
Remember the Process/Application layer protocols. Telnet is a terminal emulation program that allows you to log into a remote host and run programs. File Transfer Protocol (FTP) is a connection-oriented service that allows you to transfer files. Trivial FTP (TFTP) is a connectionless file transfer program. Simple Mail Transfer Protocol (SMTP) is a send-mail program.
熟记过程/应用层协议. TELNET是一个终端仿真程序,它允许你登录到远程主机并在其上运行程序.文件传输协议(FTP)是一个面向连接服务,它允许你进行文件传送.简单FTP(TFTP)是一个无连接的文件传送程序.简单邮件传输协议(SMTP)是一个发送邮件的程序
clip_image005
Remember the Host-to-Host layer protocols. Transmission Control Protocol (TCP) is a connection-oriented protocol that provides reliable network service by using acknowledgments and flow control. User Datagram Protocol (UDP) is a connectionless protocol that provides low overhead and is considered unreliable.
熟记主机到主机层协议. 传输控制协议(TCP)是一个面向连接服务,通过使用确认应答和流量控制提供了可靠的网络服务.用户数据报协议(UDP)是一个无连接协议,提供了较低的网络开销并被认为是不可靠的.
clip_image006
Remember the Internet layer protocols. Internet Protocol (IP) is a connectionless protocol that provides network address and routing through an internetwork. Address Resolution Protocol (ARP) finds a hardware address from a known IP address. Reverse ARP (RARP) finds an IP address from a known hardware address. Internet Control Message Protocol (ICMP) provides diagnostics and destination unreachable messages.
熟记因特网层协议. 因特网协议(IP)是一个无连接协议,它提供了通过互联网络的网络地址和路由.地址解析协议(ARP)可以从已知的IP地址来查找MC地址.逆向ARP(RARP)是从已知的MC地址来查找IP地址.因特网控制报文协议(ICMP)提供了诊断和目的不可达的信息.
clip_image007
Remember the Private IP ranges.
Class A private address range is 10.0.0.0 through 10.255.255.255.
Class B private address range is 172.16.0.0 through 172.31.255.255.
Class C private address range is 192.168.0.0 through 192.168.255.255.
clip_image008