By Scott Bennett
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Additional resources for 31 Days Before Your CCENT Certification (Cisco Networking Academy Program)
3. The sending host responds with an ACK to complete the connection. The hosts can then communicate and send segments reliably. If any segments are not acknowledged within a specified time, they are retransmitted. These sequenced segments are assembled by the TCP process and delivered to the upper-layer applications for de-encapsulation into data. 3: Table 29-4 describes the differences between TCP and UDP. 1: Often, ISPs provide to customers application layer services such as HTTP, FTP, SMTP, POP3, and IMAP4.
This choice is often driven by a lack of availability of other types of connections, expense, or a lack of teenagers in the household. ■ Digital Subscriber Line (DSL) provides a faster-than-dialup, yet more expensive, connection over phone lines. A DSL modem uses a different frequency than a phone, so the user can be on the phone and online at the same time—an optimal configuration for teenagers and smallbusiness users alike. ■ A cable modem provides an Internet connection over the same coaxial cable used to provide television.
These sequenced segments are assembled by the TCP process and delivered to the upper-layer applications for de-encapsulation into data. 3: Table 29-4 describes the differences between TCP and UDP. 1: Often, ISPs provide to customers application layer services such as HTTP, FTP, SMTP, POP3, and IMAP4. In addition, an ISP can provide secure services such as HTTPS and SFTP. A web server provides HTTP and HTTPS, a file server provides FTP, and a mail server provides POP3 and IMAP4. 4: When you set up a web server, you can choose to provide web access through HTTP or more secure access through HTTPS.