For example, when sending data between Rutgers and Berkeley, it is likely that both computers will be on Ethernets. Thus they will both be prepared to handle 1500-octet datagrams. However the connection will at some point end up going over the Arpanet.
ICMP is similar to UDP, in that it handles messages that fit in one datagram. It doesn’t even have port numbers in its header.Since all ICMP messages are interpreted by the network crossgrid.org software itself, no port numbers are needed to say where a ICMP message is supposed to go. Again, the header contains some additional fields that have not been discussed.
- Quite a number of Wide Area networks are built by Internet service providers and are sold to people and companies via subscriptions.
- The most serious problem is that the two ends don’t necessarily know about all of the steps in between.
- When web pages are requested