ccna 200-301 questions

ccna 200-301 questions

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Part of the configuration of any host at boot time is to specify the host IP address. Most systems store the IP address in a disk file for reading at boot time. In Chapter 5 , we will discuss how a diskless system obtains an IP address at boot time . On the same layer, both parties have one or more corresponding protocols for communication. For example, one protocol allows the TCP layer to communicate, while another protocol allows two IP layers to communicate. 2) It should be able to receive packets in RFC 1042 ( IEEE 802 ) encapsulation format mixed with RFC 894 . IP is the core protocol in the TCP / IP protocol family. All TCP , UDP , ICMP and IGMP data are transmitted in IP datagram format (see Figures 1-4 ). Many people who are new to TCP / IP are surprised by the fact that IP provides unreliable, connectionless datagram delivery services, especially those with X.25 or SNA background. 5) is assumed to be an Ethernet, then the sending host must be 32 bit of the IP address into a 48 bit Ethernet address. This minimum length of 60 bytes includes a 14- byte Ethernet frame header, but does not include a 4 -byte Ethernet frame trailer. There are some books as the minimum length of 64 bytes, including the end of the Ethernet frame. We FIG 1--7 in the minimum length as 46 bytes, not including intentionally 14 header byte frame, as corresponding to the maximum length ( 1500 bytes) refers to the MTU - the maximum transmission unit (See Figures 2-5 ). We often use MTU because it limits the length of IP datagrams, but it is generally not related to the minimum length. Most device drivers or interface cards automatically fill Ethernet data frames to the minimum length with padding characters. Of 3 ,ccna 200-301 questions, 4 and 5 rows IP datagram (including TCP Segments) are shorter than the minimum length, so they must be padded to 60 bytes. The next output field arp who-has in line 1 indicates that in this data frame as an ARP request, the destination IP address is the address of svr 4 and the IP address of the sending end is the address of bsdi . tcpdump prints the default IP address corresponding to the host name (in Section 4.7 , we will use the -n option to see the real IP address in the ARP request .

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