The minimum number of columns in a datagram network is two; the minimum number of columns in a virtual-circuit network is four. Can you explain the reason? Is the difference related to the type of addresses carried in the packets of each network?
Answers
Answer:
A datagram and virtual circuit network handles packetized data. In this type of network, each packet has a routing table which is based on the destination address. The routing tables are dynamic and are updated periodically. The destination addresses and the corresponding forwarding output ports are recorded in the tables of data-gram network and the virtual circuit identifier in the case of a virtual circuit network. So, data-gram and virtual circuit need a routing or switching table to find the output port from which the information belonging to a destination should be sent out. But, a circuit switched network, data are not packetized and no routing information is carried with the data in which each entry is created when the setup phase is completed and deleted when the teardown phase is over. So, a circuit switched network has no need for such a table. 2. In a datagram network, each switch (or packet switch) has a routing table which is based on the destination address, The minimum number of columns in a datagram networks
Answer:
Concept:
In a datagram network, switching and routing are based on the global final destination address.
Explanation:
Two entries are required at a minimum: one for the end destination and one for the output port. The input port from which the packet was received is irrelevant in this case. The virtual circuit identification, which has a local jurisdiction, is used to switch or route in a virtual-circuit network. This means that the same virtual circuit number can be used by two different input or output ports. Input port, input virtual circuit number, output port, and output virtual circuit number are the four pieces of information necessary.
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