Free Directory Submission 2008-10-23 02:08:00 Submit your site free to the following directory:Just copy this links to your browser and enjoy free submission,it is fully free.submit your link there and increase your blog ranking and increase your blog traffic.://www.globeofblogs.com/register.php://www.blogarama.com/add-a-site/://www.blogdigger.com/add.jsp (quick sign up first)://www.hirank.com/semantic-indexing-project/census/index.html://www Read more:Directory
, Submission
HDLC Encapsulation 2008-10-22 08:30:00 WAN Encapsulation ProtocolsOn each WAN connection, data is encapsulated into frames before crossing the WAN link. To ensure that the correct protocol is used, you need to configure the appropriate Layer 2 encapsulation type. The choice of protocol depends on the WAN technology and the communicating equipment. The more common WAN protocols and where they are used is shown in the figure, following a
Parallel to serial Conversion 2008-10-22 08:29:00 Parallel to Serial Conversion
The terms DTE and DCE are relative with respect to what part of a network you are observing. RS-232C is the recommended standard (RS) describing the physical interface and protocol for relatively low-speed, serial data communication between computers and related devices. The EIA originally defined RS-232C for teletypewriter devices. The DTE is the RS-232C interface tha Read more:Parallel
Serial Point-to-Point Links 2008-10-22 00:33:00 Time Division MultiplexingBell Laboratories invented time-division multiplexing (TDM) to maximize the amount of voice traffic carried over a medium. Before multiplexing, each telephone call required its own physical link. This was an expensive and unscalable solution. TDM divides the bandwidth of a single link into separate channels or time slots. TDM transmits two or more channels over the same l Read more:Serial
Internet Connection Options 2008-10-22 00:30:00 Metro EthernetMetro Ethernet is a rapidly maturing networking technology that broadens Ethernet to the public networks run by telecommunications companies. IP-aware Ethernet switches enable service providers to offer enterprises converged voice, data, and video services such as IP telephony, video streaming, imaging, and data storage. By extending Ethernet to the metropolitan area, companies can p Read more:Internet
, Internet Connection
, Options
Internet Connection Options 2008-10-22 00:26:00 Broadband ServicesBroadband connection options are typically used to connect telecommuting employees to a corporate site over the Internet
. These options include cable, DSL, and wireless.DSLDSL technology is an always-on connection technology that uses existing twisted-pair telephone lines to transport high-bandwidth data, and provides IP services to subscribers. A DSL modem converts an Ethernet s Read more:Internet Connection
, Options
Packet Switched Connection Options 2008-10-22 00:24:00 Common Packet
Switching WAN TechnologiesThe most common packet-switching technologies used in today's enterprise WAN networks include Frame Relay, ATM, and legacy X.25.X.25X.25 is a legacy network-layer protocol that provides subscribers with a network address. Virtual circuits can be established through the network with call request packets to the target address. The resulting SVC is identified b Read more:Options
, Switched
Wan Link Connection Options 2008-10-21 08:08:00 Many options for implementing WAN solutions are currently available. They differ in technology, speed, and cost. Familiarity with these technologies is an important part of network design and evaluation.WAN connections can be either over a private infrastructure or over a public infrastructure, such as the Internet.Private WAN Connection Options
Private WAN connections include both dedicated and sw
Wan Switching Concept 2008-10-21 08:05:00 Circuit Switching
A circuit-switched network is one that establishes a dedicated circuit (or channel) between nodes and terminals before the users may communicate.As an example, when a subscriber makes a telephone call, the dialed number is used to set switches in the exchanges along the route of the call so that there is a continuous circuit from the caller to the called party. Because of the swit Read more:Concept
Wan Physical Layer Standard 2008-10-21 08:03:00 WAN physical-layer protocols describe how to provide electrical, mechanical, operational, and functional connections for WAN services. The WAN physical layer also describes the interface between the DTE and the DCE. The DTE/DCE interface uses various physical layer protocols, including:EIA/TIA-232-This protocol allows signal speeds of up to 64 kb/s on a 25-pin D-connector over short distances. It Read more:Layer
, Standard
Wan and OSI Model 2008-10-21 07:58:00 As described in relation to the OSI reference model, WAN operations focus primarily on Layer 1 and Layer 2. WAN access standards typically describe both physical layer delivery methods and data link layer requirements, including physical addressing, flow control, and encapsulation. WAN access standards are defined and managed by a number of recognized authorities, including the International Organ
DHCP Message Format 2008-10-21 00:24:00 The developers of DHCP needed to maintain compatibility with BOOTP and consequently used the same BOOTP message format. However, because DHCP has more functionality than BOOTP, the DHCP options field was added. When communicating with older BOOTP clients, the DHCP options field is ignored.Operation Code (OP) - Specifies the general type of message. A value of 1 indicates a request message; a value Read more:Message
BOOTP and DHCP 2008-10-21 00:23:00 The Bootstrap Protocol (BOOTP), defined in RFC 951, is the predecessor of DHCP and shares some operational characteristics. BOOTP is a way to download address and boot configurations for diskless workstations. A diskless workstation does not have a hard drive or an operating system. For example, many automated cash register systems at your local super market are examples of diskless workstations.
Introducing DHCP 2008-10-21 00:18:00 What is DHCP?Every device that connects to a network needs an IP address. Network administrators assign static IP addresses to routers, servers, and other network devices whose locations (physical and logical) are not likely to change. Administrators enter static IP addresses manually when they configure devices to join the network. Static addresses also enable administrators to manage those devic Read more:Introducing
Configuring The Wireless Access Point 2008-10-20 07:16:00 Overview of Configuring
the WirelessAccess
PointThe basic approach to wireless implementation, as with any basic networking, is to configure and test incrementally. Before implementing any wireless devices, verify the existing network and Internet access for the wired hosts. Start the WLAN implementation process with a single access point and a single client, without enabling wireless security. V
Securing a Wireless Lan 2008-10-20 07:14:00 Controlling Access to the Wireless
LANThe concept of depth means having multiple solutions available. It is like having a security system in your house, but still locking all the doors and windows and asking the neighbors to watch it for you. The security methods you have seen, especially WPA2, are like having a security system. If you want to do something extra to secure access to your WLAN, you
Wireless Security Protocol 2008-10-20 07:08:00 Wireless Protocol
OverviewTwo types of authentication were introduced with the original 802.11 standard: open and shared WEP key authentication. While open authentication is really "no authentication," (a client requests authentication and the access point grants it), WEP authentication was supposed to provide privacy to a link, making it like a cable connecting a PC to an Ethernet wall-jack. As w Read more:Wireless
, Wireless Security
Wireless Lan Security 2008-10-20 07:03:00 Threats To Wireless
Security:Wireless network faces some threats. They are:-Unauthorized AccessSecurity should be a priority for anyone who uses or administers networks. The difficulties in keeping a wired network secure are amplified with a wireless network. A WLAN is open to anyone within range of an access point and the appropriate credentials to associate to it. With a wireless NIC and knowled
Planning the Wirelwss Lan 2008-10-20 07:02:00 Planning the Wireless LANImplementing a WLAN that takes the best advantage of resources and delivers the best service can require careful planning. WLANs can range from relatively simple installations to very complex and intricate designs. There needs to be a well-documented plan before a wireless network can be implemented. In this topic, we introduce what considerations go into the design and pl
Wireless Operations 2008-10-20 06:56:00 The wireless network mode refers to the WLAN protocols: 802.11a, b, g, or n. Because 802.11g is backward compatible with 802.11b, access points support both standards. Remember that if all the clients connect to an access point with 802.11g, they all enjoy the better data rates provided. When 802.11b clients associate with the access point all the faster clients contending for the channel have to Read more:Wireless
Wireless Lan(WLAN )Components 2008-10-20 05:36:00 Wireless Access Points:An access point connects wireless clients (or stations) to the wired LAN. Client devices do not typically communicate directly with each other; they communicate with the AP. In essence, an access point converts the TCP/IP data packets from their 802.11 frame encapsulation format in the air to the 802.3 Ethernet frame format on the wired Ethernet network.In an infrastructure Read more:Components
, Wireless
Wireless Lan Standard 2008-10-20 05:24:00 Wi-Fi Certification Wi-Fi certification is provided by the Wi-Fi Alliance (), a global, nonprofit, industry trade association devoted to promoting the growth and acceptance of WLANs. You will better appreciate the importance of Wi-Fi certification if you consider the role of the Wi-Fi Alliance in the context of WLAN standards.Standard
s ensure interoperability between devices made by different manu Read more:Wireless
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