ccna 200-301 complete video

ccna 200-301 complete video

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3) TCP sends a connection request segment to the remote host, that is, sends an IP datagram with the above IP address ( we will discuss the details of completing this process in Chapter 18 ). 3) Network control protocol ( NCP : Network Control Protocol ) system for different network layer protocols . The current RFC defines the network layers as IP , OSI network layer, DEC net, and Apple Talk . For example, IP NCP allows both parties to agree whether to compress the message header, similar to CSLIP (the abbreviation NCP can also be used in front of TCP ). In the last two sections we discuss ICMP query messages—address mask and timestamp query and response. Now analyze an ICMP error message, that is, a port unreachable message, which is one of the ICMP destination unreachable messages. Let's take a look at the additional information in the ICMP error message. Use UDP (see Chapter 11 ) to see it. What happens if the host being queried is down or does not exist? For this we specify a non-existent Now look at another example: the host bsdi has an IP datagram to be transmitted to the ftp.uu.net host, and its IP address ICMP is often considered an integral part of the IP layer. It passes error messages and other information that needs attention. ICMP messages are usually used by the IP layer or higher layer protocols ( TCP or UDP ). Some ICMP messages return error messages to the user process. The ICMP timestamp request allows the system to query the current time from another system. The recommended value returned is the number of milliseconds since midnight, Coordinated Universal Time (UTC ) (early reference manuals considered UTC to be Greenwich Mean Time). The advantage of this ICMP message is that it provides resolution in milliseconds, and the time obtained from other hosts by other methods (such as the rdate command provided by some Unix systems ) can only provide resolution in seconds. Since the returned time is calculated from midnight,ccna 200-301 complete video, the caller must know the date at that time by other methods, which is a drawback of it.

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