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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
Lecture-3 48 Intranet
Private network that is designed to host
the same information services found on
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
to anyone outside of the private network. Extranet
Cross between the Internet and an
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.
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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- Winter '08