Question

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?​

Answer 1

Answer:

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 2

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

Explanation:

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