Networking

Basic commands and configurations of cisco router

April 21, 2011

Router Modes Note: There are other modes than these. Not all commands work in all modes. Be careful. If you type in a command that you know is correct—show run, for example—and you get an error, make sure that you are in the correct mode. Global Configuration Mode Configuring a Router Name This command works [...]

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Dialer profiles in cisco routers

April 20, 2011

A dialer profile is a logical interface bound to a physical interface. In the instance of rotary groups, a single dialer profile can be bound to multiple physical interfaces. Additionally, you can have multiple dialer profiles bound to a single physical interface. A key difference between rotary groups and dialer profiles is that a physical [...]

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Little About ARP, IARP, RARP, and Proxy ARP

March 12, 2011

ARP – Address Resolution Protocol The basic ARP operation is simple enough. We concentrate on IP addressing a great deal in our studies and our jobs, but it’s not enough to have a destination IP address in order to send data; the transmitting device must have a destination MAC address as well. If the sender [...]

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Getting Started With HSRP

March 12, 2011

Defined in RFC 2281, HSRP is a Cisco-proprietary protocol in which routers are put into an HSRP router group. Along with dynamic routing protocols and STP, HSRP is considered a high-availability network service, since all three have an almost immediate cutover to a secondary path when the primary path is unavailable. One of the routers [...]

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How to Configure a Cisco Delegating Router for Prefix Delegation (IPv6)

March 12, 2011

Now in order, to get a Cisco router’s downstream interface to act like a Delegating Router (DHCPv6 Server) that performs Prefix Delegation for a specific Requesting Router (DHCP Client); and also for a group RR’s (DHCP clients) by using a DHCP for IPv6 configuration pool, you will need to complete the following 10 steps: Router>enable [...]

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HDLC Configuration And Troubleshooting

March 12, 2011

With a point-to-point WAN link such as the following, we’ve got two options for encapsulation – HDLC and PPP. (HDLC, PPP, and Frame Relay do not run on LANs – you wouldn’t configure them on Ethernet interfaces.) We’re not going to discuss HDLC for long, since there’s not much to say about it – but [...]

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Frame Relay LMI And LMI Autosense

March 12, 2011

The Local Management Interface (LMI) messages are sent between the DCE, typically the service provider, and the DTE, the Cisco router. LMI Status messages serve as keepalives for the frame connection. If keepalives are not continually received by both the DCE and DTE, the frame connection will drop. The LMI also indicates the PVC status [...]

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Frame Relay Encapsulation Types

March 12, 2011

The DCE and DTE must agree on the LMI type, but there’s another value that must be agreed upon by the two DTEs serving as the endpoints of the VC. The Frame encapsulation can be left at the default of Cisco (which is Cisco-proprietary), or it can be changed to the industry-standard IETF, as shown [...]

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How To Configuring PPP Callback On A Cisco Router

March 12, 2011

You may run into situations where a router in a remote location needs to dial in to a central router, but the toll charges are much higher if the remote router makes the call. This scenario is perfect for PPP Callback, where the callback client places a call to a callback server, authentication takes place, [...]

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Little About Binary and Hexidecimal Conversion

March 9, 2011

What are binary numbers? The binary number system is when only two numbers are used – 0 and 1. It is also called base 2. The computer number system is base 2. Our number system is referred to as decimal or base 10 because we use 10 digits (0 – 9) to form all of [...]

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Little About Fiber Optics

March 8, 2011

Introduction One of the greatest advancements in the networking field in the last couple of decades has been the widespread adoption of fibre optic communication technologies. Without fibre optic cables we would not have the network speeds we see today. Likewise, we would not have a lot of the products and services that are available [...]

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Valid Host IDs of different Class Network

February 22, 2011

Valid Host ID of Class A Network- In the class A Network first byte of the IP address is assign to the network address and three remaining byte are used for the node addresses means we can see the format of the Class A address is- network.node.node.node The Class A network address is one byte [...]

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Little about IPV4 Address Classes

February 22, 2011

The Network address which is also known as Network number identifies each network. The Network address shares the ip address on each device in the network. The host address is uniquely identifies address which is assign to each machine. The different class of the IPV4 address- Class A address- The Class An address was designed [...]

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Public and the Private IP Address

February 22, 2011

In IP terminology, a private network is typically a network that uses private IP address. Although most of the IPV4 address are the public address designate for use in network that are accessible on the internet, there are blocks of addresses used in the network that require limited or no internet access. These addresses are [...]

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POP3

February 21, 2011

POP3, which is an abbreviation for Post Office Protocol 3, is the third version of a widespread method of receiving email. Much like the physical version of a post office clerk, POP3 receives and holds email for an individual until they pick it up. And, much as the post office does not make copies of [...]

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HTTPS

February 19, 2011

HTTPS (HTTP over SSL or HTTP Secure) is the use of Secure Socket Layer (SSL) or Transport Layer Security (TLS) as a sublayer under regular HTTP application layering. HTTPS encrypts and decrypts user page requests as well as the pages that are returned by the Web server. The use of HTTPS protects against eavesdropping and [...]

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