Which is wrong among the following descriptions of the basic contents of the application layer protocol?
Which is wrong among the following descriptions of the domain name resolution (DNS)?
Which is wrong among the following descriptions of the TELNET’s basic working principle?
Which is wrong among the following descriptions of the network management functions?
According to the naming method of the object managed by SNMP, a company is going to introduce a newly developed server product to the market，suppose that the company has a MIB node number 150 under the “enterprise” subtree, but has applied for an identifier number of 50 for the new server product. What are the correct server object identifiers?
Telnet, SMTP and FTP depend on the _____ protocol.
The simple mail transfer protocol SMTP is used when the e-mail program sends mail to the mail server, while the _ _ _ _ _ _ _ protocol can be used when the e-mail program reads mail from the mail server.
From the perspective of protocol analysis, the first step of WWW service operation is the _ _ _ _ _ of WWW browser to WWW server.
The default port number of HTTP is 25, and the default port number of Mail is 80.
Continuous connection can be divided into non-pipeline and pipeline working modes.
The pipelined way is that the client can only issue a new request if the previous response is received.
SIP is a control signaling protocol that implements instant messaging in the application layer. It can transmit ordinary text, audio or video data, E-mail, chat, game and other data.
Which is wrong among the following descriptions of the characteristics of the e-mail system?
Which is wrong among the following descriptions of the basic concepts of the Web services?
Which is wrong among the following descriptions of the HTTP characteristics?