Hubs connect multiple local area network (LAN) devices together.Here are the main types of network devices: To build a strong network and defend it, you need to understand the devices that comprise it. Physically interfaces with transmission medium and sends data over the network Provides error checking and transfer of message frames Negotiates and establishes a connection with another computer Provides encryption, code conversion and data formatting HTTP, FTP, TFTP, DNS, SMTP, SFTP, SNMP, RLogin, BootP, MIME Provides services such as e-mail, file transfers and file servers You can easily remember them using the mnemonic phrase “All people seem to need data processing.” Understanding this model will help you build a strong network, troubleshoot problems, develop effective applications and evaluate third-party products. It consists of seven functional layers that provide the basis for communication among computers over networks, as described in the table below.

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