2.3-4 Comparing and contrasting HTTP and SMTP (3). Which of the following characteristics apply to both HTTP and SMTP? Note: check one or more of the characteristics below.Group of answer choicesIs able to use a persistent TCP connection to transfer multiple objects.Uses CRLF.CRLF to indicate end of message.Operates mostly as a “client push” protocol.Has ASCII command/response interaction, status codes.Operates mostly as a “client pull” protocol.Uses a blank line (CRLF) to indicate end of request header.
Question
2.3-4 Comparing and contrasting HTTP and SMTP (3). Which of the following characteristics apply to both HTTP and SMTP? Note: check one or more of the characteristics below.Group of answer choicesIs able to use a persistent TCP connection to transfer multiple objects.Uses CRLF.CRLF to indicate end of message.Operates mostly as a “client push” protocol.Has ASCII command/response interaction, status codes.Operates mostly as a “client pull” protocol.Uses a blank line (CRLF) to indicate end of request header.
Solution
Both HTTP and SMTP share the following characteristics:
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They are able to use a persistent TCP connection to transfer multiple objects. This means that once a connection is established, multiple objects can be transferred without the need to re-establish the connection.
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They use CRLF (Carriage Return Line Feed) to indicate the end of a message. This is a standard protocol for marking the end of a line of text.
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They have ASCII command/response interaction, status codes. This means that they use ASCII codes to communicate between the client and the server, and to indicate the status of the connection or request.
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They use a blank line (CRLF) to indicate the end of a request header. This is a standard way of marking the end of the header section in a request.
However, they differ in the following ways:
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HTTP operates mostly as a “client pull” protocol. This means that the client requests data from the server, and the server responds by sending the data to the client.
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SMTP, on the other hand, operates mostly as a “client push” protocol. This means that the client sends data to the server, and the server responds by acknowledging receipt of the data.
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