Cisco Networking

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Network Basics: Variable Length Subnet Masks (VLSM)

When you include subnet masks in all routing tables, you allow the routing protocol to support Variable Length Subnet Masks (VLSM) with which, simply put, you do not need to use the same subnet mask on [more…]

Network Basics: Services Port Assignment

The port numbers from 0 to 1023 are called well-known ports. They are used by system processes that provide widely-used network services. So what services use what ports in the world of TCP and UDP? Here [more…]

Network Basics: Network Destination Addresses

The data link layer provides the means to transfer data between all network devices, including Cisco components, using network destination addresses. These data link layer addresses have their own set [more…]

Network Basics: Networking Port Overview

In TCP/IP and UDP networks, a port is an endpoint to a logical connection. The port number identifies what type of port it is. For example, port 80 is used for HTTP traffic. If you use a command, such [more…]

Network Basics: TCP Session Establishment - Handshaking

To send data over TCP in a network, you should follow the required session establishment process, known as handshaking, or more specifically, a three-way handshake [more…]

Network Basics: Local Host ARP Requests

For local hosts (hosts on your network segment), an Address Resolution Protocol (ARP) request starts with some type of network communication request between two computers. This could be [more…]

Network Basics: Switch Duplex/Simplex Communication

Network switches can operate in either duplex or simplex mode. The distinction makes a fundamental difference in the throughput and reliability of these devices on your network. [more…]

Network Basics: Remote Host ARP Requests

If your targeted host is not on the local subnet it is considered a remote host. The Address Resolution Protocol (ARP) the process of establishing a remote host [more…]

Cisco Networking: Static ARP Entry Managment

A static Address Resolution Protocol (ARP)entry is a permanent entry in your ARP cache. A static ARP entry can be managed from a Cisco device or a Windows workstation. Even though it is rarely called for [more…]

Network Basics: Comparing IPv4 and IPv6 Address Structures

Essentially, IPv6 dramatically increases the number of addresses available in IPv4. This is due to major change in the addressing structure between the Internet protocols. [more…]

Network Basics: IPv6 Address Simplified Notation

When working with IPv6 address, it can take a lot to write your addresses — after all, they are 128 bits long. To make life simpler, here are some rules you can use to condense this notation: [more…]

Network Basics: IPv6 Special Address Identification

IPv6 handles special addresses differently from IPv4. With IPv4, you have seen that there may be special address groups that existed within the total IP address space. In addition to Class A, B, and C [more…]

Network Basics: Assigning IPv6 Addresses

If you're working in a Cisco network and assigning addresses to your IPv6 network cards, you need to know that just like IPv4 addresses there is a network portion of the address and a host portion of the [more…]

Network Basics: Integration of IPv6 with IPv4

Because the entire world is currently running IPv4, one of the big questions is how to move people over to IPv6. It is not like they can just announce that on January 1 the Internet will use only IPv6. [more…]

Network Basics: Changing Device Boot-Up Configuration

In order to install a new Internetwork Operating System (IOS) update or otherwise implement an altered boot configuration begins by interrupting the usual boot-up process. Within 60 seconds of starting [more…]

Cisco Discovery Protocol Overview

Cisco Discovery Protocol (CDP) is data link layer protocol that allows you to find information about the connections between devices. Cisco Discovery Protocol [more…]

Network Basics: Collision Overview

A collision occurs on your network when something happens to the data sent from the physical network medium that prevents it from reaching its destination. Mainly, it encounters another signal from another [more…]

Network Basics: Powering Up Your Switch

The first step on getting a switch integrated into a network is to get it powered up. There are several options for getting power to your switch, but the most common is the universal power cords used on [more…]

Networking Cable Basics

You will find two main types of networking cables in any bundle of cables lying around your office. The majority of the cables will be straight-through cables [more…]

Cisco Networking: Switch Interface Configuration

Your new Cisco switch mostly already configured. You can just connect it to your network after removing it from the box. All the interfaces or ports on your switch are enabled by default, unless you disable [more…]

Cisco Networking: Setting the Enable Password

The enable password is used when you move from User EXEC mode to Privileged EXEC mode on a Cisco device. This condition gives you security on your switch because Privileged EXEC mode is where all the dangerous [more…]

Cisco Networking: Using Telnet

If you need to remotely manage your Cisco switch, you will be able to choose between Telnet and Secure Shell (SSH). There are dangers to using Telnet, it sends data over the network in plain text, which [more…]

Cisco Networking: Secure Shell (SSH) Password Configuration

Secure Shell (SSH) is a network protocol for your Cisco devices which is more secure than Telenet. Setting a secure password is a configuration requirement for this protocol. [more…]

Cisco Networking: Banner Configuration

A banner is a message presented to a user who is using the Cisco switch. The type of banner you configured for use determines when this message is shown. You can configure three main types of banners on [more…]

Secure Shell (SSH) User Account Management

Secure Shell(SSH) user accounts are required in order to log on. These accounts can be stored in a local database on the switch or on a central access server named [more…]

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