VPNSM Introduction: This document gives basic information about integrated VPN module widely used in 6500 and 7600 series. Virtual Private Network Services module The cisco ip sec vpnsm is a technology that can be incorporated with the Cisco Catalyst 6500 Series Switch and Cisco 7600 Series Internet Router to meet the increased demand of VPN connectivity and hence bandwidth requirements Key Features: Integration with network infrastructure - Incorporating VPN into the Catalyst 6500 Switch and 7600 Internet Router secures the network without the need for extra overlay equipment or network alterations. High performance and scalability - Incorporating the latest in encryption hardware acceleration technology, the IPSec VPN module can deliver up to 1.9 Gbps of Triple Data Encryption Standard (3DES) traffic at large packet sizes (500 bytes+) and 1.6 Gbps of 3DES traffic at average packet sizes (300 bytes). This module can terminate 8,000 IPSec tunnels simultaneously at an accelerated rate compared with current offerings. Advanced security services - Enables simplified deployment of secure campus, provider-edge, VPN termination, and secure converged network services, such as voice over IP (VoIP) and storage area networks, by integrating encryption, authentication, and integrity to network services. ... View more

SSHv2 (Secure Shell version 2): The SSHv2 transport protocol provides a reliable, secure, full-duplex data stream between the SSH peers. Secure means that the data is encrypted and has strong integrity checking in place. Full duplex means that there is an independent data stream in each direction, so both sides can transmit data independently. In addition to providing a secure data stream, the transport protocol is responsible for authenticating the server to the client; for negotiating the encryption, integrity, and compression methods; and for the initial and subsequent key exchanges. These methods can be negotiated independently for each side. Thus, each peer can choose its own encryption, integrity, and compression methods from the set supported by its peer. The currently supported encryption methods are 3des-cbc; blowfish-cbc; 128, 192, and 256-bit twofish-cbc; 128, 192, and 256-bit aes-cbc; 128, 192, and 256-bit serpent-cbc; idea-cbc; 128-bit cast-cbc; and RC4. The only required method is 3des-cbc. The 128-bit aes-cbc method is recommended, and the others are optional. Notice that all the block ciphers operate in cipher block chaining mode. ... View more

3G The most significant feature of 3G mobile technology is that it supports greater numbers of voice and data customers — especially in urban areas — and higher data rates at lower incremental cost than 2G. It also allows the transmission of 384 kbit/s for mobile systems and 2 Mb/s for stationary systems. 3G users are expected to have greater capacity and better spectrum efficiency, which allows them to access global roaming between different 3G networks. Cisco 3G Wireless HWIC works on 3G technology. ... View more

Basic defination of a router: A router is a device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and itsISP's network. Routers are located at gateways, the places where two or more networks connect, and are the critical device that keeps data flowing between networks and keeps the networks connected to the Internet. When data is sent between locations on one network or from one network to a second network the data is always seen and directed to the correct location by the router. They accomplish his by using headers and forwarding tables to determine the best path for forwarding the data packets, and they use protocols such as ICMP to communicate with each other and configure the best route between any two hosts. ... View more

UplinkFast is a Cisco specific feature that improves the convergence time of the Spanning-Tree Protocol (STP) in the event of the failure of an uplink. The UplinkFast feature is supported on Cisco Catalyst 4500/4000, 5500/5000, and 6500/6000 series switches running CatOS. This feature is also supported on Catalyst 4500/4000 and 6500/6000 switches that run Cisco IOS® System Software and 2900 XL/3500 XL, 2950, 3550, 3560 and 3750 series switches. The UplinkFast feature is designed to run in a switched environment when the switch has at least one alternate/backup root port (port in blocking state), that is why Cisco recommends that UplinkFast be enabled only for switches with blocked ports, typically at the access-layer. Do not use on switches without the implied topology knowledge of a alternative/backup root link typically to distribution and core switches in Cisco multilayer design. Refer to Understanding and Configuring the Cisco UplinkFast Feature. ... View more

INTRODUCTION Cisco Systems Cisco Unity Express for Cisco CallManager Express Enterprise businesses share an ongoing goal to increase employee productivity and reduce costs through technology. Organizations can cost-effectively support their Full Service Branch solutions with converged networks that integrate data, voice and video. Integrated branch-office platforms lower hardware costs, simplify remote management and offer flexible configuration options that reduce the total cost of operations and ownership. Companies that exploit the benefits of convergence can increase their return on technology investment and further improve employee productivity. Cisco Unity Express supports the Full Service Business by providing voice mail and automated attendant services specifically designed for the small and medium branch office environment. With Cisco Unity Express, users can easily and conveniently manage their voice messages and greetings with intuitive telephone prompts and a straightforward Graphical User Interface that allows simple administration. Cisco Unity Express is an essential component of either a Cisco CallManager or Cisco CallManager Express solution. In a Cisco CallManager environment, Cisco Unity Express provides local storage and processing of voice mail and automated attendant services for the branch office, thereby alleviating WAN bandwidth and Quality of Service concerns. The combination of Cisco CallManager Express and Unity Express provides a solution that enables small and medium businesses and branch offices to deliver voice, data, and telephony management services integrated on a single, router-based platform. The solution offers a core set of phone features to meet everyday business needs, while providing the rich telephony feature sets that key system and hybrid PBX customers have grown to expect. Enhancing the Cisco portfolio of messaging products such as Cisco Unity and Cisco Personal Assistant, Cisco Unity Express delivers the basic voice mail and auto attendant requirements of the branch or small office. With Cisco Unity at headquarters and Cisco Unity Express at the branch, employees can move from location to location with ease and familiarity, requiring little additional training to access voice mail ... View more

TCP/IP Defines a set of rules to enable computers to communicate over a network, specifying how data should be packaged, addressed, shipped, routed, and delivered to the right destination. The specification defines protocols for different types of communication between computers and provides a framework for more detailed standards. Transport layer The transport layer's responsibilities include end-to-end message transfer capabilities independent of the underlying network, along with error control, fragmentation and flow control. End to end message transmission or connecting applications at the transport layer can be categorized as either: connection-oriented e.g. TCP connectionless e.g UDP The transport layer can be thought of literally as a transport mechanism, for example, a vehicle whose responsibility is to make sure that its contents (passengers/goods) reach its destination safely and soundly, unless a higher or lower layer is responsible for safe delivery. The transport layer provides this service of connecting applications together through the use of ports. Since IP provides only a best effort delivery, the transport layer is the first layer of the TCP/IP stack to offer reliability. Note that IP can run over a reliable data link protocol such as the High-Level Data Link Control (HDLC). Protocols above transport, such as RPC, also can provide reliability. For example, TCP is a connection-oriented protocol that addresses numerous reliability issues to provide a reliable byte stream: data arrives in-order data has minimal error (i.e correctness) duplicate data is discarded lost/discarded packets are resent ( includes traffic congestion control [1] --Nmamgain 03:45, 9 April 2008 (EDT)k ... View more

Cisco 3700 Series multiservice access routers With on-board LAN/WAN connectivity, new high-density service modules, and support for multiple advanced integration modules, the Cisco 3700 Series Multiservice Access Router delivers new levels of service density for branch offices in a compact form factor. When configured with the 16- or 36-port EtherSwitch network module, the Cisco 3700 Series offers a single, integrated platform that combines flexible routing and low-density switching. In addition, it can support internal inline power for the EtherSwitch ports, delivering a single-platform IP telephony and voice gateway solution that facilitates flexible, incremental, and scalable migration to a converged network. These single-platform solutions help lower total cost of ownership by simplifying training, deployment, and management, and modular expansion options help protect current network investment. As a cornerstone of Cisco AVVID (Architecture for Voice, Video and Integrated Data), the Cisco 3700 Series supports rich Cisco IOS Software features such as availability, quality of service, and security to address the resiliency needs of the branch office. The Cisco 3700 Series combines these features with flexible application and services consolidation to offer branch offices a platform optimized for integrating future services. ... View more