Answer:
255
Explanation:
1 byte has 8 bits, that is, 8 combinations of binary inputs, which can result in calculations up to the number 2 ^ 8-1 = 255 (-1 because 0 will always be the first number), a computer nowadays has 64 bits (8bytes ), thus being able to calculate numbers up to 2 ^ 64-1, an integer file has 4 bytes, being able to calculate up to 2 ^ 32-1, and so on.
Answer:
If you code a column list in an INSERT statement that includes a column that’s defined with a default value, you can insert the default value for that column by coding the DEFAULT keyword in the VALUES clause of the INSERT statement.
Explanation:
SQL permits insert the DEFAULT value on the columns when is required. Suppose the column has a NULL constraint(values on this column can not be set in null), then you can pass the default value.
For example:
INSERT INTO table(field1, field2, field3, field4) VALUES (10, DEFAULT, 20, DEFAULT)
Answer:
1 is in the application layer, 2 is in the physical layer, 3 is in the transport layer
Explanation:
The application layer is the upper layer, and it does not have a footer but it has an IP Address, and the physical layer its stream of bits, and it has neither header nor footer. And the transport layer has the footer and header both. Remember the destination address is attached as a part of the header with the data at the Datalink Layer, which carries details of all physical addresses, and the whole packet is converted to a stream of bits before it reaches the physical layer. And thus everything is encapsulated and converted in the form of bits only to be carried by the physical layer to the destination address, The NAT at router maps the legal public address, and the private address, which is the part of the internet LAN at the destination. This process is conducted at the host as well. You can check the HTTP of the application layer. It carries Header and IP address of the destination, but no footer. Ans it is data 1 here. And only layer here that has no header is the Physical layer, as all others have it. And all which are part of the middle layer, the network, and transport layer have footer but here, we only have the transport layer, and hence Data 3 is the Transport layer. And this gives us the correct option, and which is the fourth one.
In the digital signature technique when the whole message is signed using an asymmetric key, the sender of the message uses his or her own private key to sign the message.