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Cisco Routers
DHCP (Dynamic Host Configuration Protocol) is the protocol used by network devices (such as PCs, network printers, etc) to automatically obtain correct network parameters so they can access network a…
Network Cabling
The 10Base-T UTP Ethernet and 10Base-2 Coax Ethernet were very popular in the early to mid 1990's when 100 Mbps network cards and hubs/switches were very expensive. Today's prices have dropped so muc…
Routing
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 examine how OSPF discovers neighbors by sending Hell…
ICMP Protocol
The ICMP - Time Exceeded message is one which is usually created by gateways or routers. In order to fully understand this ICMP message, you must be familiar with the IP header within a packet. Our r…
OpManager - Network Monitoring & Management
Demands for Enterprise networks to properly support mobile users is on a continuous rise making it more than ever necessary for IT departments to provide high-quality services to its users. This arti…
Cisco Services & Technologies
 What Is Unified Communications (UC)? Unified communications is a very popular term these days and we see it appearing on almost every vendor as they rename their platforms and products to incl…
TCP - UDP Protocol Analysis
This article covers the UDP protocol. We examine the structure of the UDP header, the protocols that use UDP as a transport plus a lot more. Some common protocols which use UDP are: DNS, TFTP, ARP…
Cisco CallManager-CCME
Cisco's CallManager Express GUI interface is an important part of the CallManager Express product as it provides the ability to administer CME via a web browser. Generally, the CME GUI interface is e…
Cisco Routers
If you’re tired of setting up SPAN sessions to capture network traffic transiting your network and Cisco router, it’s time to start using Cisco’s Embedded Packet Capture (EPC), available from IOS 12…
SASE & SD-WAN Networks
The Virtual Private Network (VPN) has become the go to security solution for keeping communications between networks and endpoints secure. After all, VPNs offer a straightforward, secure method for c…
The OSI Model
The Network layer is responsible for routing through an internetwork and for networking addressing. This means that the Network layer is responsible for transporting traffic between devices that are…
Routing
Enhanced Interior Gateway Routing Protocol (EIGRP), similar to IGRP, is a Cisco proprietary routing protocol that is used to exchange routing information between different routers within a network. E…

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