... Spectrum Technology 47
Uses of Spread Spectrum 48
Wireless Local Area Networks 48
Wireless Personal Area Networks 49
Wireless Metropolitan Area Networks 49
FCC Specifications 49
Frequency Hopping ... popular networking certification programs leave off:
wireless LANs.
Your study of wireless networking will help you bring together two fascinating worlds of
technology, because wireless networks ... keep pace. Wireless LANs
are reaching into new areas with each passing month that nobody thought they would
ever reach. If you administer LANs, there's simply no avoiding wireless. Wireless...
... (or go to Start > Control
Panel > Network)
2. Select your Wireless LAN Card, right click on the icon and select “Properties”. Click on Wireless
Network tab.
3. Select the Access ... Windows XP Wireless Utility as an example.
2. Right click on “My Network Places” on your desktop and select “Properties” (or go to Start >
Control Panel > Network) .
3. Select your Wireless ... Windows XP Wireless Utility as an example.
2. Right click on “My Network Places” on your desktop and select “Properties” (or go to Start >
Control Panel > Network) .
3. Select your Wireless...
... can be implemented to increase network security.
There are two primary types of IDS: network based and host-based. The network based
system acts similarly to a network level firewall. It cannot ... information about the network con-
figuration.
Authentication,
especially of exter-
nal BACnet users.
Network
Layer
Attacks
I-Am-Router-
To -Network
The I-Am-Router-To -Network message can ... traffic across the untrusted network (LAN/Internet).
• As a router, separates the trusted network from the untrusted and thus can act as a
BACnet firewall, performing network layer or application...
... one considers that the AT&T Wireless IP network
can connect to many other networks, including other wireless IP networks, customer networks, value-added
service networks, online information ... corporate network is connected to the AT&T Wireless IP network, all or part of the corporate
network is effectively connected to the AT&T Wireless IP network and, indirectly, to these other networks.
Internal ... include wireless data networks requires an understanding of the
security being utilized by the existing wireless data technology, as well as the security provided by
networks to which the wireless network...
... using SIR
•
Then they shift to FIR speed
Wireless Communications
Low Rate Wireless Personal Area
Networks
2
Objectives
•
Describe a wireless personal areanetwork (WPAN)
•
List the different WPAN ... work
•
Describe the security features of low-rate WPAN
technology
3
What is a WPAN?
•
Wireless personal areanetwork (WPAN)
–
Group of technologies that are designed for short-
range communications
–
Eliminates ... devices
•
Include
–
Bluetooth
–
802.15.4 (ZigBee)
12
Bluetooth Protocol Stack (continued)
14
Bluetooth Protocol Stack (continued)
•
Network topologies (continued)
–
Scatternet
•
Group of piconets in which connections exist between...
... corrected
–
Also called error correction (FEC)
Wireless# Guide to Wireless Communications 26
Mesh Networking (802.15.5)
(continued)
Wireless# Guide to Wireless Communications 28
How UWB Works
•
UWB ... are present
in the same order in every frame
Wireless# Guide to Wireless Communications 15
802.15.3 Network Topology (continued)
Wireless# Guide to Wireless Communications 27
Ultra Wide Band (UWB)
•
Allows ... and storage
Wireless# Guide to Wireless Communications 32
How UWB Works (continued)
Wireless# Guide to Wireless Communications 18
Additional MAC Layer Functionality
(continued)
Wireless Communications
Chapter...
... wired network interface port
•
AP functions
–
Wireless communications base station
–
Bridge between the wireless and wired networks
6
Wireless Network Interface Card
(continued)
5
Wireless Network ... of wireless clients and an AP
•
Extended Service Set (ESS)
–
Two or more BSS wireless networks installed in same
area
–
Provides users with uninterrupted mobile access to the
network
•
All wireless ...
communicate among themselves
Wireless Communications
Wireless Local Area Networks
4
WLAN Components
•
Minimal hardware needed for a WLAN
–
Computer
–
ISP
–
Wireless network interface card
–
Access...
... WMAN?
•
Wireless metropolitan area networks (WMANs)
–
Provide wireless connectivity across a substantial
geographical area such as a large city
•
WMANs primary goals
–
Extend wired networks ... Wireless Communications
Wireless Metropolitan Area
Networks
14
Multichannel Multipoint Distribution
Service (MMDS)
•
Multichannel multipoint distribution service (MMDS)
–
Fixed broadband wireless ... same network
•
WiMAX MAC layer makes it easy for carriers to
deploy the network
•
Range of a WiMAX network is measured in miles
•
Cellular phone operators can easily incorporate
WiMAX networks
3
What...
... 1xEVDO
•
For 2.5G CDMA2000 1xRTT networks
25
Binary Runtime Environment for
Wireless (BREW)
•
BREW is a thin software environment
–
Very small program that resides on a wireless device
•
Capable ... frequency channels
•
Supports 144 Kbps packet data transmission
2
Objectives
•
Describe wireless wide area networks (WWANs) and
how they are used
•
Describe the applications that can be used on ... technologies
16
2.5 Generation Cellular Telephony
(continued)
•
2.5G network technologies
–
General Packet Radio Service (GPRS)
•
For TDMA or GSM 2G networks
•
Uses eight time slots in a 200 KHz spectrum and...
... nhất được nhận dạng bởi thiết bị hai đầu.
5.4 CÔNG NGHỆ VLAN:
VLAN là viết tắt của Virtual Local AreaNetwork hay còn gọi là mạng LAN
ảo. Một VLAN được định nghĩa là một nhóm logic các thiết bị ... hình native VLAN thì
phải cấu hình ở giao diện vật lý.
CHƯƠNG II
LÝ THUYẾT VỀ MẠNG
WAN (WIDE AREA NETWORK)
I. KHÁI NIỆM :
Là mạng được thiết lập để liên kết các máy tính của hai hay nhiều khu ... trí rất xa nhau, ví dụ như
những quốc gia khác nhau, thì khi đó ta có mạng diện rộng WAN(Wide Area
Network)
Trang
NGUYỄN ĐÌNH CÔNG – 36CLTH
2929
V./. CÁC CÔNG NGHỆ MẠNG LAN :
5.1. CÔNG NGHỆ CHUYỂN...
... improve-
ments.
9.7 Summary
In this chapter we cover the area of Wireless Local Area Networks by focusing on a number
of issues:
†
WLAN topologies. The two types of wireless LAN topologies used today are the ... Local Access: Wireless LAN and Wireless ATM, IEEE Commu-
nications Magazine, November, 1997, 34–40.
[15] Geier J. Wireless LANs, Implementing Interoperable Networks, Macmillan Network Architecture ... Control Protocol for Wireless Data Networks, in
Proceedings of IEEE GLOBECOM, 1993, pp. 1713–1717.
[9] Chen K C. and Lee C H. Group Randomly Access Polling for Wireless Data Networks, in Proceedings...