ccna 200-301 network simulator tools today amana

ccna 200-301 network simulator tools today amana.1. IP Protocol The responsibility of IP is to transport data from the source to the destination. It is not responsible for ensuring transmission reliability, flow control, packet order, and other services that are common for host-to-host protocols. IP performs two basic functions: addressing and segmentation. IP can deliver a datagram to a destination address based on the destination address included in the datagram header, and in doing so IP is responsible for choosing the route of delivery; this route selection is called the routing function. If only small datagrams can be transmitted within some networks, 1P can reassemble the datagram and indicate it in the header field. The fields that make up the IP header are shown in Figure 2-4-3, with the value in parentheses indicating the number of bits occupied by the field. The Priority and Type of Service fields are generally used for QoS (Quality of Service); Time To Live (TTL) is the upper limit of time a datagram can live, set by the sender, and the TTL is reduced by at least one for each route, and discarded if the time to live is reduced to zero when the destination is not reached; Source and Destination IP addressThe source and destination IP addresses are used to indicate where the data is coming from and where it is going to. It is not necessary for candidates taking the CCNA exam to remember every field in the IP header, a simple understanding of the above fields will suffice.Version (4) Header length (4) Priority and service type (8) Total packet length (16)Marking (16) Flags and offset weight (16)(8) Header checksum (16)Source IP address (32)Destination Old Address (sold )Options (0 or 32)Data Variation )Figure 2-4-3 IP header format