Chapter 11 Wireless Network standards

Components of access points

1. at least one interface to connect to the wired network; 2. transmitting equipment to connect with the wireless clients; 3. IEEE 802.1D bridging software to act as a bridge between wirless and wired Data Link layers.

Which IEEE 802.11 standard operates in the 5 GHz frequency range, has a data speed of up to 54 Mbps, and has a range of 15 meters indoors and 30 meters outdoors?

802.11a

Major wireless standards include:

802.11a, 802.11b, 802.11g, and 802.11n

Which IEEE 802.11 standard operates in the 2.4 GHz frequency range, has a data speed of up to 11 Mbps, and has a range of 45 meters indoors and 90 meters outdoors?

802.11b

Which IEEE 802.11 standard operates in the 2.4 GHz frequency range, has a data speed of up to 20+ Mbps, and has a range of 45 meters indoors and 90 meters outdoors?

802.11g

Which IEEE 802.11 standard operates in the 2.4 and 5 GHz frequency range, has a data speed of up to 600 Mbps, and has a range of 70 meters indoors and 250 meters outdoors?

802.11n

802.11 devices compatibility

Although devices that support the 802.11a standard are generally incompatible with those that support 802.11b, some devices are equipped to support either 802.11a or 802.11b. The newest apporved standard, 802.11n, allows 802.11b, 802.11g, and 802.11n devices to operate together on the same network. Many modern APs support multiple standards. For example, one AP might offer concurrent support for 802.11a, b, g, and n clients in addition to 100 Mpbs wired network clients.

10.0.0.0-10.255.255.255

Class (A) IP address reserved for private use by any internal network and aren't routable on the Internet

172.16.0.0.-172.31.255.255

Class (B) IP address reserved for private use by any internal network and aren't routable on the Internet

192.168.0.0-192.168.255.255

Class (C) IP address reserved for private use by any internal network and aren't routable on the Internet

21

FTP (File Transfer Protocol) for file transfer services

80

HTTP (HyperTextTransport Protocol) for Web server traffic

802.11

Most widles used wireless technology standard. The IEEE 802.11 standard specifies a technology that operates in the 2.4-2.5 GHz.

Particularly in smaller networks, many internal devices can share a single external IP address through a device that provides

PAT. Such a device, typically a router or firewall, performs NAT services using port unumber to differentiate between internal computers sharing the single address.

PAT

Port address translation

25

SMTP (Simple Mail Transport Protocol) for sending e-mail

443

SSL (Secure Sockets Layer) for secure connections over HTTPL

access point

The 802.11 defines an _____________________ as a device that functions as a transparent bridge between the wirelless clients and the wired network.

The 802.11 defines an _____________________ as a device that functions as a transparent bridge between the wirelless clients and the wired network.

access point

802.11b

devices supporting __________ can: - transmit data at up to 11 Mbps -use a frequency range of 2.4 GHz in the radio band -the speed decreases as the client gets farther away from the wirless access point, moving closer to the maximum range of 300 feet. -primarily used for TCP/IP Many cordless phones, microwave ovens, and Bluetooth devices also use the 2.4 GHz frequency range and interfere with an 802.11b wireless network. used for home and office.

802.11g

devices supporting __________ can: - transmit data at up to 54 Mbps -use a frequency range of 2.4 GHz in the radio band -It's backwards-compatible with 802.11 but has higher throughput at 20+Mbps. -Devices supporting 802.11g have a transmission range of up to 45 meters indoors and 90 meters outdoors. -Note that 802.11g devices can experience interference from other common household devices, such as microwave ovens, Bluetooth devices, baby monitors, and cordless telephones that also operate in the 2.4 GHz band

802.11n

devices supporting __________ can: - transmit data at up to 600 Mbps -use a frequency range of either 5 GHz or 2.4 GHz in the radio band - transmission range is up to 70 meters indoors and 250 meters outdoors -Devices suppporting 802.11n can coexists with 902.11g, 802.11b, and 802.11a.

802.11a

devices supporting ______________ can: -transmit data at up to 54 Mbps -use a frequency range of 5 GHz in the radio band -it allows for a shorter maximum range of about 150 ft. -must faster than 802.11b and doesn't interference from cordless phones, microwave ovens, or Bluetooth devices, as _____________ does. -____________ is a good option for a wireless home LAN, easily capable of broadcasting high devinition DVD movies to TVs located throughout the house, without any worry about bandwidth or cables. Devices supporting 802.11a arent't compatible with those 802.11b or g.

intranet

is an organization's private network

It identifies which application should receive and process the packet

the port number