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Ethernet Protocol, CSMA/CD, Collisions

Troubleshooting techniques for Fast Ethernet

This page will primarily discuss problems unique to Fast Ethernet. The Collision Domain Incompatible Ethernet Jabber Auto-negotiation Prioriti...
Domain Name System (DNS)

The DNS Protocol - Part 3: DNS Query Message Fo...

This section will deal with the analysis of the DNS packets by examining how DNS messages are formatted and the options and variables they contain....
Ethernet Protocol, CSMA/CD, Collisions

The Novell Proprietary Frame Format

Novell's Proprietary Frame Format was developed based on a preliminary release of the 802.3 specification. After Novell released its proprietary fo...
Network Fundamentals

Media Access Control - MAC Addresses

A MAC address, or Media Access Control address, is a unique identifier assigned to a network interface controller (NIC) for use as a network addr...

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Netflow Articles:

Netflow vs SNMP. Two Different Approaches to Ne...

SNMP (Simple Network Management Protocol) and Netflow are both popular protocols with admins, prized for their ability to give visibility over the ...

Netflow: Monitor Bandwidth & Network Utilizatio...

Monitoring network traffic & bandwidth usage via Netflow is mandatory for any type and size network. Gaining visibility into user traffic, appl...

NetFlow Analyzer: Free Download, Step-by-Step I...

In our previous article we explained how a Netflow Analyzer can help you gain visibility into your user traffic, application traffic and data flows...

Complete Guide to Netflow: How Netflow & its Co...

This article will cover the basics of Netflow, including its use cases, Netflow supported devices, Netflow history, and variants. We’ll also dive i...

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VLAN Networks

VLAN Security - Making the Most of VLANs

It's easy to see why virtual LANs have become extremely popular on networks of all sizes. In practical terms, multiple VLANs are pretty much the same as...
VLAN Networks

Static VLANs

VLANs are usually created by the network administrator, assigning each port of every switch to a VLAN. Depending on the network infrastructure and secur...
VLAN Networks

InterVLAN Routing - Routing between VLAN Networks

This article deals with the popular topic of InterVLAN routing, which is used to allow routing & communication between VLAN networks. Our article an...
VLAN Networks

VTP Introduction & Modes

The invention of VLANs was very much welcomed by all engineers and administrators, allowing them to extend, redesign and segment their existing network ...

Routing

Routing Information Protocol - RIP

Routing Information Protocol (RIP) is a distance-vector routing protocol that is commonly used in small to medium-sized networks. It is one of the...
Routing

OSPF - Part 1: Introduction, OSPF Packet Structure, ...

Open Shortest Path First (OSPF) is a popular routing protocol developed for Internet Protocol (IP) networks by the Interior Gateway Protocol (IGP) worki...
Routing

OSPF - Part 3: OSPF Adjacency & Neighbor Forming Pro...

This is the thrid article of our 6-part OSPF series (see below) that describes how OSPF routers perform neighbor relationship and adjacency. We’ll exami...
Routing

Hybrid Routing Protocols - Advantages and Disadvanta...

Hybrid routing protocols are a combination of distance-vector and link-state routing protocols, and are used to provide a more efficient and scala...

Cisco Routers

Configuring Cisco Dynamic Multipoint VPN (DMVPN) - H...

Our DMVPN Introduction article covered the DMVPN concept and deployment designs. We explained how DMVPN combines a number of technologies that give it i...
Windows Servers

Download Altaro Free VM Backup & Win a PlayStation 4...

We have some exciting news for you today! Altaro has launched a great contest in celebration of SysAdmin Day on 27th July! They will be giving away Am...
Windows Servers

Renaming Windows 2000 Domain Name

Sometimes renaming a domain is an essential business requirement. There are many situations, such as mergers, change of company name or migration from a...
Network Protocol Analyzers

Advanced Network Protocol Analyzer Review: Colasoft ...

Firewall.cx has covered Colasoft Capsa several times in the past, but its constant improvements make it well worth revisiting. Since the last review, th...