Network Router &Ethernet Switches

Routers and Ethernet cisco  switch help information to move from one computer to another by forwarding data over networks. The switch and the router have different capabilities and are usually deployed in different types of networks. Whereas a switch is always found on a Local Area Network (LAN), routers are needed for Wide Area Networks (WAN), especially the Internet.

Switches/Network Switches
A cisco network switch is an electronic box with a number of sockets or ports. Each computer in a network connects to a port on the switch via an Ethernet cable. No device can connect to a network without a network adapter. The network adapter has a serial number burned onto it. This unique number is the physical address, known as the MAC address, of the computer. It is appended to the front of all data packets traveling across a network. The packet contains the MAC addresses of both the source and destination computer for the packet. Network switches associate the MAC address of each connected computer to the socket to which that computer is connected. When one computer sends a data packet to the switch, the switch reads the destination address and sends the packet out on the socket associated with that address.

Routers/Cisco Routers
Routers send data around the Internet through a chain of links that forms a path. Each router has to be connected to at least two networks. One of those networks must contain at least one other router, which in turn should link to another router over another network. Routers use Internet Protocol (IP) addresses to direct data to the correct network. Any computer that can be contacted over the Internet has to have a unique IP address. A router collates a list of IP addresses and the various paths available to reach that point. Although the router calculates the best direction to forward the data, it does not dictate the whole path. It passes the data packet onto a neighboring router and that router then makes its own decision where to forward the data.

Routers vs. Switches
Routers have greater capabilities than switches. They can operate over local networks as well as over the Internet. IP addresses assigned to computers on local networks do not need to be unique throughout the world, only on the LAN. The router keeps track of any messages leaving the network from a locally assigned address, which cannot be used cisco over the Internet, and forwards the incoming response back to that request when it arrives. Both outgoing and incoming messages carry the router's IP address and not the locally assigned IP address of the originating computer. Routers operating over private networks offer extra security features, such as firewalls, for different segments of the network. Switches cannot provide these functions.

Routers with Switches
Routers and switches usually work together. While the router commands the overall direction for a data packet, the switch guides data over one link of a network. Data packets usually pass through a router and a switch using both an IP address and a MAC address. Network gateways have to translate between the two addressing methods, using the Address Resolution Protocol.

Networking Basics You Should Know: Network Switches & Routers

When someone looks at networking basics, understanding the way a cisco network hardware operates is the first step to understanding routing and switching. The network operates by connecting computers and peripherals using two pieces of equipment; switches and routers. Switches and routers, essential networking basics, enable the devices that are connected to your network to communicate with each other, as well as with other networks.

Though they look quite similar, routers and switches perform very different functions in a network.

What youneed to be clear about Networking Basics.
Routers, the second valuable component of your networking basics, are used to tie multiple cisco network equipment together. For example, you would use a router to connect your networked computers to the Internet and thereby share an Internet connection among many users. The router will act as a dispatcher, choosing the best route for your information to travel so that you receive it quickly.

Routers analyze the data being sent over a network, change how it is packaged, and send it to another network, or over a different type of network. They connect your business to the outside world, protect your information from security threats, and can even decide which computers get priority over others.

Depending on your business and your networking plans, you can choose from routers that include different capabilities. These can include networking basics such as:
Firewall: Specialized software that examines incoming data and protects your business network against attacks
Virtual Private Network (VPN): A way to allow remote employees to safely access your network remotely
IP Phone network: Combine your company's computer and telephone cisco network products, using voice and conferencing technology, to simplify and unify your communications

Switches are used to connect multiple devices on the same network within a building or campus. For example, a switch can connect your computers, printers and servers, creating a network of shared resources. The switch, one aspect of your networking basics, would serve as a controller, allowing the various devices to share information and talk to each other. Through information sharing and resource allocation, switches save you money and increase productivity.

There are two basic types of switches to choose from as part of your networking basics: managed and unmanaged.
An unmanaged switch works out of the box and does not allow you to make changes. Home-networking equipment typically offers unmanaged switches.
A managed switch allows you access to program it. This provides greater flexibility to your networking basics because the cisco command switch can be monitored and adjusted locally or remotely to give you control over network traffic, and who has access to your network.

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cisco asa 5520 prices are available for networks of all sizes, including yours.

Enhance Your Data Center Switches

Add firewall capabilities with the Cisco Catalyst 6500 Series ASA Services Module.

Firewall for Branch Routers

Get integrated security for the ISR for branch, small and midsize businesses, and managed services

Protect your server with a dedicated firewall asa 5520. Gigenet utilizes Cisco's firewall services module (FWSM) to provide instant firewall activation and simple management through a secure web interface.

High Performance, High Scalability,
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• Gbps throughput per module
• 100,000 connections per second
• 1,000,000 concurrent connections
• Single port or VLAN spanning
   

Best-In Class Features

• Time-tested Cisco PIX operating system
• PIX Device Manager GUI
• Transparent Layer(2) Firewalls
• Rich stateful inspection for web, VOIP
  and multimedia

The Cisco firewall services module is designed to recognize and filter the following types of traffic:

• Core services: HTTP, FTP, ESMTP, DNS, ICMP, TCP, UDP
• Voice over IP (VoIP) / Unified Communication services: SIP, SCCP, H.323, RTSP, TAPI/JTAP, GTP
• Application/operating system services: cisco asa 5520 price LDAP/ILS, SunRPC, XDMCP, TFTP

More about Cisco ASA 5500 Series Adaptive Security Appliances

ASA Models

There are six main models in the ASA range, from the basic 5505 branch office model up to the 5580 datacenter versions; a full comparison is available on the Cisco website here: Cisco ASA 5500 Series Adaptive Security Appliances

http://www.cisco.com/en/US/products/ps6120/prod_models_comparison.html

Although this article will concentrate on the 5505 and 5510 models the basic feature set is in fact fairly consistent across the range, the main differences being in the maximum traffic throughput handled by each model and the number/type of interfaces.

At the most basic level the ASA is a transparent or routed firewall/NAT device, this means it is designed to sit between your LAN and the Internet; one interface (normally known as "outside") will be connected to your Internet access device and one or more interfaces (e.g. "inside" and "DMZ") will connect to your internal networks. This enables the ASA to inspect and control all traffic passing between your network and the Internet, exactly what it does with that traffic is the clever bit.

ASA 5510

The ASA5510 is intended to be a single device solution to your Internet security requirements and with its 300Mbps throughput and 9,000 firewall connections per second capacity will be suitable for most office deployments. The key features will be covered in more detail later but in brief these are; firewall/NAT, SSL/IPsec VPN, content security and intrusion prevention. It has five 10/100Mbps ports, by default these provide one outside (Internet) interface, one management and three internal network interfaces but they are fully reconfigurable and also support vLANing for further network subdivision if required. Functionality can be upgraded via a Security Services Module port which provides support for additional Content Security and Intrusion Prevention features.

ASA 5505

The ASA5505 is intended for small or branch office and teleworker deployments, often in conjunction with a 5510 or higher model at the head office to which it will establish a secure VPN, whilst providing full security for other Internet traffic. The device has 8 10/100Mbps Ethernet ports, including 2 with Power over Ethernet support suitable for PoE devices such as IP phones or cameras, so it can be used as single unit solution for the smaller office. Key differences compared to the 5510 are the reduced support for VPN connections (only 10 but upgradeable to 25 with license), only 3 vLANs (25 with Security Plus license)  and only a slot for the optional Security Services Card so there is no option for the advanced Content Security services.

Key Features

Firewall

All ASA models include a fully featured policy based firewall and routing engine which allows you complete control of which traffic you allow in and out of your network. Layer 2/3 firewalling allows you to specify which hosts are allowed access through the ASA and also to perform Network Address Translation to map internal hosts to public IP addresses. Layer 7 firewall goes several steps further and also allows you to define access policies based on application and protocol type, providing extremely granular control over Internet access and protection against advanced types of network attack. Unlike many competitor's firewalls the ASA's policy and interface based approach to access control gives you complete control over traffic leaving your network as well as incoming, for example allowing you to restrict Instant Messaging use to only your approved client application. Deep packet inspection goes beyond simply analysing the protocol and port of the attempted connection to discover the application behind it making it virtually impossible for users to circumvent company IT policies.

SSL & IPsec VPN

Even the cisco ASA 5505 includes full support for IPsec and SSL VPN endpoints, providing highly encrypted tunnels for office to office and remote user to office connections. The basic license for all ASAs allows IPsec VPN connections up to the maximum supported on each model but only includes two SSL VPN licenses, to allow for testing before deployment. The 5505 will support up to 25 simultaneous VPN connections, whilst the 5510 supports a maximum of 250 - these can be any combination of IPsec or SSL, and site to site or remote client types.

IPsec VPNs are commonly deployed between Cisco VPN devices for site to site connections, or initiated by client software on the remote worker's computer. Included with all ASA license bundles is the Cisco AnyConnect VPN client, with versions available for all major operating systems; Windows 2000 up to Windows 7, Mac OS X (10.4/5), Linux Intel kernel 2.6.x and even Windows Mobile 5.0/6.0/6.1 . Cisco AnyConnect provides several improvements over the basic IPsec functionality built into those operating systems, key features are:

• DTLS protocol support to help minimize latency for applications such as VoIP
• Support for SSL tunneling to ensure connectivity even through restrictive proxies and firewalls (if web browsing is possible then so is a VPN connection)
• Advanced encryption and wide range of authentication protocols, including two factor smartcard/token based
• Flexible IP tunneling for consistent user experience with features such as connection retention, ensuring the mobile user retains connectivity through disconnections, reboots and standby/hibernation.

Tips:

Cisco ASA Firewalls: 5505, 5510, 5520, 5540, 5580, the full Cisco PIX Firewall family, FWSM, CSM, Cisco VPN Routers etc.

Cisco VPN: VPN 3000 Series Concentrators, VPN blades, Site-to-Site VPN, Remote Access VPN, Cisco SSL VPN etc.

Cisco IPS: 4200 series, IDSM-2 blade, Cisco IOS IPS, Shunning, IPS Manager, IDM, AIP-SSM, HIPS (CSA) etc.

Cisco MARS: MARS 20, MARS 50, MARS 100, integration with IPS and CSA, reports, queries, local / global set ups etc.

Identity Management:Cisco ACS, RADIUS, TACACS+, 802.1x, LDAP, OTP, RSA, certificates, biometrics etc.

Router & Switch Security: Access-Lists, VLAN maps, TCP Intercept, Lock-and-Key, Anti Spoofing, CBAC, IOS Firewall etc.

Network Admission Control (NAC): In-band, out-of-band, clean access client, ACS integration, 3rd. party integration etc.

How to Set Passwords on Cisco Routers

Having a password on your CISCO router is the difference between casually browsing the Internet and losing your entire data and network infrastructure. There are two primary passwords that need to be set; the enable password, and the enable secret password. Without these passwords, anyone accessing the router CISCO881G-S-K9 is able make any configuration changes they want, to include shutting you out of your own network. In less than two minutes, setting your passwords puts you on your way to a more secure router and network infrastructure.

What youneed as follows:

CISCO router

Ethernet cable or console cable

How to Set the Passwords on a CISCO Router?

1.Connect your computer to the CISCO router by using either a console cable or an Ethernet cable. If using the console cable, connect it to the console port on your computer, then to the console port on the CISCO router which will be labeled "Console," (CISCO 2600 Series Cabling and Setup) in blue writing. If using an Ethernet cable, first connect it to your computer's Local Area Network (LAN) port, usually located on the side of a laptop, or the rear of a desktop computer, then to the Ethernet port labeled "ETHERNET 0/0" (CISCO 2600 Series Cabling and Setup) on the CISCO router.

2. Use the console port to access the router CISCO881W-GN-A-K9 via the Hyper Terminal program that comes preinstalled with the Windows operating system.

Go to the Start menu and select "All Programs" >"Accessories">"Communications." Click on the shortcut to Hyper Terminal. Use the following port settings when asked by Hyper Terminal:

Bits per second: 9600

Data bits: 8

Parity: None

Stop bits: 1

Flow control: None

Alternately, open a command prompt window by going to your Start menu and selecting "Run." Then enter "cmd," and press "Enter." In the command prompt, enter the command "telnet" followed by the IP address of the router.

The command line looks like this: C:\telnet 123.156.204.12

3.Enter the privileged mode of the router before attempting any changes. Use the following command. Note that the "Router>" is the default router prompt for a CISCO router.

Router>enable

Entering the enable command will change your CISCO router prompt to:

Router#

4. Use the following command to enter the configuration mode of the cisco 1800  router:

Router#config t

Successfully entering the configuration mode will give you the following message: "Enter configuration commands, one per line. End with CNTL/Z."

Entering the configuration mode of the CISCO router will give you the following prompt:

Router(config)#

5.Set the enable password by using the command "enable password". For example, use the password "Changeme2".

Router(config)#enable password Changeme2

Use a strong password base when setting the enable password. The enable password is a virtual terminal password that is used to protect access to the router over a network interface. This password is not stored encrypted on the CISCO 881 router, and can be seen when viewing the router configuration.

6.Set the enable secret password by using the command "enable secret." For example, use the password "Newpswd4."

Router(config)#enable secret Newpswd4

Use a different password for the enable secret password than for the enable password. The enable secret password is more secure and encrypted. Unlike the enable password, the enable secret password cannot be seen by viewing the CISCO router configuration.

Cisco Catalyst 3560 v2 Series Switches, Most Popular in Cisco Catalyst 3560 Series

The Cisco Catalyst 3560 v2 Seriesis the next-generation energy-efficient Layer 3 fast Ethernet switches. This new series of switches supports Cisco EnergyWise technology, which enables companies to measure and manage power consumption of network infrastructure and network-attached devices, thereby reducing their energy costs and their carbon footprint.

Cisco3560 v2 Series switch consumes less power than its predecessors and is the ideal access layer switch for enterprise, retail, and branch-office environments, as it maximizes productivity and investment protection by enabling a unified network for data, voice, and video.

Key Features of cisco 3560g 12 puertos Series

• Lower power consumption than its predecessors

• Backward compatible - uses the same Cisco IOS^® Software image as the 3560 series and has the same feature set

• Full EnergyWise support to monitor energy consumption of network infrastructure and implement energy saving programs to reduce energy costs

• Compatible with Cisco Redundant Power System (RPS) 2300

• All units have a uniform depth of 11.9 inches for better cable management

•Preconfigurable with the Cisco IOS Software release at the time of ordering

• IPv6 routing included in the IP Services feature set

• DC powered stand-alone model

About cisco 3560 switch price india Switch Configurations

3560V2-24TS (hot): 24 Ethernet 10/100 ports and 2 Small Form-Factor Pluggable (SFP)-based Gigabit Ethernet ports; 1 rack unit (RU)

3560V2-48TS (hot): 48 Ethernet 10/100 ports and 4 SFP-based Gigabit Ethernet ports; 1RU

3560V2-24PS (hot): 24 Ethernet 10/100 ports with PoE and 2 SFP-based Gigabit Ethernet ports; 1 RU

3560V2-48PS (hot): 48 Ethernet 10/100 ports with PoE and 4 SFP-based Gigabit Ethernet ports; 1RU

3560V2-24TS-SD: 24 Ethernet 10/100 ports and 2 SFP-based Gigabit Ethernet ports; 1RU, DC power supply

Price and Availability

Where to buy a cost-effective catalyst 3560 poe price? RouterSwitch.con is here, which can provide all items of Cisco 3560 switches at very competitive prices.

Contact details: Email: cisco@router-switch.com (Sales Inquiries)

 webmaster@router-switch.com (Technical Inquiries)

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Address:7/F, Sino Centre, 582-592 Nathan Road, Mongkok Kowloon HongKong

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Live Chat:Use the Live Chatonline our sales representatives.

MSN:cisco@router-switch.com

Notes: Cisco Catalyst 3560-E Series Switches

http://www.router-switch.com/Price-cisco-switches-cisco-switch-catalyst-3560_c22?page=3

Cisco Catalyst 3560-X Series Switches

http://www.router-switch.com/Price-cisco-switches-cisco-switch-catalyst-3560_c22?page=2

Cisco Catalyst 3560-E Series Switches

Cisco Catalyst 3560-E Series Switches are an enterprise-class line of standalone access and aggregation switches that facilitate the deployment of secure converged applications while maximizing investment protection for evolving network and application requirements. Configurations for the Cisco WS-C3560E-48PD-EF access switches include 24 and 48 ports of 10/100/1000 Ethernet with dual 10 Gigabit Ethernet ports. Power over Ethernet is available on both the 24-port and 48-port models and can deliver IEEE 802.3af 15.4W class 3 PoE on all ports simultaneously. Combining 10/100/1000 and PoE configurations with 10 Gigabit Ethernet uplinks, the Cisco WS-C3560E-48PD-SF enhances worker productivity by enabling applications such as IP telephony, wireless, and video.

The Cisco Catalyst 3560-E Series aggregation solutions - the Cisco Catalyst 3560E-12D, a 12-port 10 Gigabit Ethernet aggregation switch, and the Cisco Catalyst 3560E-12SD, a 12-port SFP Gigabit Ethernet aggregation switch with 2 10 Gigabit Ethernet uplink ports, deliver secure nonstop unified network services and versatile connectivity in a one-rack unit (1-RU) form factor for space- and power-constrained environments, enabling businesses to reduce total cost of ownership while maximizing investment protection.

Cisco WS-C3560E-48PD-S highlights:
• Cisco TwinGig converter module for migrating uplinks from Gigabit Ethernet to 10 Gigabit Ethernet
• PoE configurations with 15.4W of PoE on all 48 ports
• Industry first portfolio to scale beyond 15.4W per port delivering maximum solution simplicity for 802.11n access point deployments
• Access switch models have modular power supply with externally available backup
• Dual redundant modular power supplies and fans for Cisco Catalyst 3560E-12D and Cisco Catalyst 3560E-12SD aggregation switches for nonstop operation
• Multicast routing, IPv6 routing, and access control list (ACL) in hardware
• Out-of-band Ethernet management port along with RS-232 console port

Benefits of the WS-C3560E-24PD-S
Scale your network as your business grows: With the TwinGig converter module, you can convert the 10 Gigabit Ethernet interfaces into dual SFP ports in the access and aggregation layers, allowing you to migrate from Gigabit to 10 Gigabit Ethernet when your business demands change without changing network devices. The Cisco Catalyst 3560E-12D also enables the aggregation of up to 12 10 Gigabit Ethernet links within a compact 1-RU form factor in space-constrained environments. Decrease network costs over time: the Cisco Catalyst 3560-E delivers full PoE (15.4W) on every 10/100/1000 port so that as your needs for PoE and Gigabit Ethernet grow, you are positioned to support them without costly upgrades or complete network replacements.

How to Configure a DHCP Cisco 1841?

Cisco 1841 is a highly capable router that provides the full feature set needed for small or remote office connectivity to the Internet or other private networks. Dynamic Host Configuration Protocol (DHCP) service is one of the features supported by the cisco 1841 router port and must be enabled if the router is expected to provide dynamic Internet Protocol (IP) addressing to hosts on the private network. The DHCP feature includes many options; however, you can set up a standard configuration in about 30 minutes.

Tips: DHCP service is one of many features that you can enable on a Cisco 1841 router.

Things you’ll use

Cisco serial console cable

• Microsoft Windows XP computer with 9-pin serial port
• Network IP number and subnet mask intended for the network
• IP address for the network DNS server
• IP address for the network default gateway
• IP address of a local FTP server
• Name of the directory where DHCP logs can be stored on the FTP server
• Credentials of an account that has access to the FTP server

Instructions to Configure a DHCP cisco 1841 rear view Step by Step

Step1. Connect the Cisco serial console cable into the 9-pin serial port on the back of the computer and then connect the other end of the serial console cable into the serial console port on the router 1841.

Step2. Select the "Start" button on Windows XP and then select "All Programs" in the menu that appears. Then select "Accessories."

Step3.Choose the "Communications" program group and then select the "Hyperterminal" icon.

Step4. Enter " cisco 1841 pricing" in the window that appears and touch the "Enter" key. Then select the "Connect using:" menu and click the "Com" port that is connected to the Cisco 1841 from the list that displays. Click the "OK" button.

Step5.Select the "Bits per second" menu and then choose "9600" from the list that appears. Select the "Flow control:" menu and choose "None" in the list that appears. Select the "OK" button.

Step6. Tap the "Enter" key a few times and the Cisco CLI (Command Line Interface) will appear.

Step7.Enter "enable" on the command prompt and then press the "Enter" key. Type the "enable" password if requested and then tap the "Enter" key.

Step8. Type "config t" on the command prompt and then press the "Enter" key. Then type "service dhcp" and press the "Enter" key.

Step9. Type "ipdhcp database ftp://user:password@ip_address/dhcp_logs write-delay 120" except replace the "ip_address " with the FTP server IP address, the "user:password" with the account name and password for the FTP server, cisco 1841 router price list and "dhcp_logs" with the name of the directory where the DHCP logs will be stored on the FTP server. Press the "Enter" key.

Step10. Type "ipdhcp pool pool_name" except replace "pool_name" with a name for the DHCP address pool and then press the "Enter" key. Then type "network 10.0.0.0 255.0.0.0" except replace the "10.0.0.0 255.0.0.0" with the network IP number and subnet mask of the DHCP scope of addresses to be configured for the network.

Step11. Type "dns-server ip_address" except replace "ip_address" with the actual IP address of the DNS server for the network and then press the "Enter" key.

Step12. Type "default-router ip_address" except replace "ip_address" with the default gateway IP address for the network and then press the "Enter" key.

Step13. Type "end" at the command prompt and press the "Enter" key. Type "copy run start" and press the "Enter" key to save the configuration.