ccna 200-301 network simulator ns21tv

ccna 200-301 network simulator ns21tv.PC2. PC3:193.1.1.1/24 195.1.1.1/24193.1.1.3/24 195.1.1,3/2400-11-BC-7D-25-03 00-11-BC-7D-25-0400-1b-24-7d-25-02 00-1b-24-7d-25-06K44Chapter 2 Network Interconnection and Reference Models*** 902Step 1:PC1 encapsulates the packet. PC1 compares the destination IP addresses to be sent to and finds that the server's IP address 195.1.1.2 is not in the local network. PC1 knows that packets to be sent to a different network must first be sent to the gateway, which is the IP address 193.1.1.1 of router R1 Fast Ethernet interface Fa0/0 in the figure. 1.1.1 corresponding MAC address is encapsulated; if the MAC address corresponding to 193.1.1.1 is not found in the ARP cache, the ARP protocol introduced in the previous section is used to query the gateway corresponding MAC address "00-11-BC-7D-25-03".PC1 encapsulates the Telnet protocol packets, first performing segmentation and other processing at the transport layer. Since Telnet uses the TCP protocol, PC1 establishes a connection to the destination server TCP port 23 using a local random TCP source port (assumed to be 1030 here) greater than 1024. The TCP source port and destination port are added to the ProtocolData Unit (PDU) at the transport layer. As shown in Figure 2-6-2, the Protocol Data Unit is referred to as Data at the application, representation, and session layers, Segment at the transport layer, Packet at the network layer, Frame at the data link layer, and Bit at the physical layer. Because TCP is a reliable transmission control protocol, the transport layer also includes parameters such as sequence numbers and window sizes.The encapsulated data segments of the transport layer are passed to the network layer, which encapsulates the headers of the network layer, mainly by adding the source and destination IP addresses, in this case the source IP address is 193.1.1.2 and the destination IP address is 195.1.1.2o