Lecture-3 ISO Model, Network Security, and Protocols

Lecture 3 43 communications and network security cont

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Unformatted text preview: eless networking is based on IEEE 802.11b and 802.11a standards. 802.11b devices can transmit data up to 11Mbps. 802.11a devices can transmit data up to 54Mbps. Wireless networking uses connection hubs that can support one to dozens of wireless NICs. The primary drawback of wireless networking is that the signals connecting the NICs to the hubs may not be encrypted. Virtual private networks (VPNs) or other traffic encryption mechanisms must be employed to provide security for the connections. A wireless link is more susceptible to eavesdropping because the signals can often be detected blocks away, whereas UTP cables require direct physical accessLecture-3 to tap into the traffic. 44 TCP Overview Lecture-3 45 IP Classes Lecture-3 46 Masks Lecture-3 47 Internet Components The Internet is the global network of interconnected networks that provides the wealth of information we know as the World Wide Web. The Internet is host to countless information services and numerous applications, including the Web, e-mail, FTP, Telnet, newsgroups, chat, and so on. Lecture-3 48 Intranet Private network that is designed to host the same information services found on the Internet. Networks that rely upon external servers (i.e., ones positioned on the public Internet) to provide information services internally are not considered intranets. Intranets provide users with access to the Web, e-mail, and other services on internal servers that are not accessible Lecture-3 49 to anyone outside of the private network. Extranet Cross between the Internet and an intranet. An extranet is a section of an organization’s network that has been sectioned off so that it acts as an intranet for the private network but also serves information out to the public Internet. An extranet is often reserved for use by specific partners or customers. It is rarely on a public network. Lecture-3 50 An extranet for public consumption is Extranet … cont. Lecture-3 51 Firewalls Firewalls are essential tools in managing and controlling netwo...
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