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Mail Access Protocols
The e mail message are usually sent to an email server that stores received message in the recipient e mail mailbox. The user retrieves message with either a web browser or an e mail client that uses one of a number of mail retrieval protocols.
Some clients and servers preferentially use vendor specific proprietary protocols. But most support the internet protocols, SMTP for sending e mail and POP3 ( post office protocols version 3) and IMP4 ( internet Mail Access protocols , version 4 for retrieving email allowing mterprebability with other servers and clients. SMTP can also be used for retrieving email. It is more suitable for permanent internet connection than say a dialup connection and is not supported by most e mail client software.
What protocol can be applied when you need to transfer files between different platforms, such among UNIX systems and Windows servers? Use FTP (File Transfer Protocol) for file
how to switching and routing
telecommunication processors
Can you describe screened host architecture?
Explain Persistence timer? To deal with the zero-size windows What if a receiver advertises that the window size is 0 (by sending ACK) and this ACK is lost? - A
Assign switch ports to VLANs. Refer to the port assignment table at the starting of the lab to assign ports to the VLANs. Use the interface range command to make simpler this
Q. Show the Character-level Encryption? - Substitutional - Monoalphabetic - simplest form; also called Caesar cipher - Every character is replaced with another character
Q. Show the Congestion avoidance in TCP? Slow Start (SS) & Additive Increase (AI) (AI=Congestion Avoidance) start with the congestion window (cwnd) = max segment si
What is WAN? A wide area network is defines a LAN of LANs. WANs connect LANs that might be on opposite sides of a building, across the country or around the world. WANS
What is Protocol Data Unit? The data unit in the LLC level is known as the protocol data unit (PDU). The PDU having of four fields a destination service access point (DSAP), a
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