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Mail Message Format
When an e mail is sent from one person to another a header containing peripheral information precedes the body of the message itself. This contained information is contained in a series of header lines. The header liens and the body of the message are separated by a blank line. Each header line contains readable ext consisting of a keyword followed by a colon followed by value. some of the keyword are required and others are optional. Every header must have a from header line and a to header line a header may include a subject header line as well as other optional header liens a message header looks like this.
The to field gives the address of the primary recipient. Having multiple recipients is also allowed. The cc field gives the addresses of any secondary recipients. In terms of delivery there is o distinction between the primary and secondary recipients. The terms cc ( carbon copy0 is a bit dated since computers do not use cardoon paper but it is well established. The Bcc( Billed carbon copy) field is like the cc field except that this line is deleted from all the copies sent to the primary and secondary recipients. This feature allows people to send copies to third parties without the primary and secondary recipients knowing this. The next two field from and sender tell who wrote and sent the message respectively. A line containing received is added by each message transfer agent along the way. The lien contains the agents identify the date and data and time the message was received and other information that can be used for finding bugs in the routing systems. The return path field is added by the final message transfer agent and was intended to tell how to get back to the sender.
What is Connection-oriented communication Connection-oriented communication can be in three phases. In establishment phase a request is made to set up the connection. Only afte
There is only an application layer which is closer to user and also gives many application which user directly linked.for ex:- web browser
Determine the uses of firewalls The firewalls available today do all the things, viz., like filter the data packets, provide proxy services and do stateful inspection of packet
DNS Message There are the only two kinds of DNS message DNS query and reply messages. Further mote both query and reply message have the same format as shown in figure.
Q. Define the Distance Vector Routing? Distance Vector Routing Every router periodically shares its knowledge about the entire internet with its neighbours Sharing
Ans) UDP TCP SPX
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Currently One more way of accessing the Internet being developed is the use of cable modems. These need that you subscribe to a cable service & let you two-way communication with t
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