Tag: Cisco 220 posts
This page houses content of everything Cisco-related. We have the latest updates on Cisco certifications, useful troubleshooting tips and career information for Cisco professionals. Check for frequent interviews with accomplished experts at industry events like Cisco Live, and for insight into Cisco training courses.
How to Configure Routing Information Protocol: RIPv2
By Stelios Antoniou ⋅ December 3, 2007 ⋅ 9 comments
This article concentrates on the enhanced Routing Information Protocol, also known as RIP version 2. I will show you the necessary configuration steps for RIPv2 so that you will be able to configure RIP on your own. Last time we covered RIP version 1, which included information on RIP operation, drawbacks, configuration, and much more. [...]
Basic Networking Protocols: Part 1
By Stelios Antoniou ⋅ November 29, 2007 ⋅ 4 comments
Are you considering a career in Cisco Networking? Going for your CCENT or CCNA certifications? Well, here’s one article you don’t want to miss! Read on as I introduce you to some important protocols used at the network layer of the OSI model. The knowledge you are about to gain from this information is essential, [...]
How To Back Up and Restore Configuration on CISCO Devices
By Stelios Antoniou ⋅ November 26, 2007 ⋅ 3 comments
Sooner or later in your networking career, you will realize that there is nothing more important than backing up your system’s configuration. Days, or even months of hard work can disappear in a matter of seconds. That’s why it is so important to always take the measures to prevent this from happening. Performing backups often [...]
How To Configure Routing Information Protocol: RIPv1
By Stelios Antoniou ⋅ November 19, 2007 ⋅ 13 comments
Routing Information Protocol (RIP) is one of the oldest routing protocols used by routers within a small geographic location to find routes to various networks within an internetwork. In this article I’ll provide you with the details of RIP’s operation, drawbacks and improvements. I will put emphasis on enabling and configuring RIP with the help [...]
New Training Release: Cisco CCENT Training
By Kasia Lorenc ⋅ November 19, 2007 ⋅ 3 comments
Cisco CCENT: Your Start To A Successful Networking Career Get Your Start in Cisco Networking with Train Signal’s Cisco CCENT Certification Training Videos — Available Now! The Cisco CCENT – Cisco Certified Entry Networking Technician – certification is designed for entry-level network support positions. This new certification is your half-way point to your CCNA certification [...]
IP Addressing and Routing Part 3: Default and Static Routing
By Stelios Antoniou ⋅ November 15, 2007 ⋅ 5 comments
For those of you who missed Parts 1 and 2 of my IP Addressing and Routing mini-series you can see the articles here: Part 1: IP Address Architecture Part 2: IP Routing Process I suggest taking a look at the first two parts before moving on to the third one, just because there is a [...]
IP Addressing and Routing Part 2: IP Routing Process
By Stelios Antoniou ⋅ November 12, 2007 ⋅ 4 comments
In Part 1 of IP Addressing and Routing we learned about the architecture and principles of the IP addressing scheme.Routers (and note: we are dealing with Cisco routers here), are responsible for routing packets to their final destinations by looking at the network portion of the address. In today’s article we’ll get into the details [...]
Simplify Routing with Subnetting: How to Organize Your Network Into Smaller Subnets
By Stelios Antoniou ⋅ November 8, 2007 ⋅ 13 comments
In my last article, IP Addressing and Routing Part 1: The Invasion of IP Addresses, I presented the architecture of the IP addressing scheme. We went over the IP Network Classes and how to distinguish between them. If you’re new to this field, I would suggest adding both Part 1 and Part 2: IP Routing [...]
IP Addressing and Routing Part 1: IP Address Architecture
By Stelios Antoniou ⋅ November 5, 2007 ⋅ 6 comments
I wrote this article with the invasion of IP services in our daily life in mind. Think about it — the electronics you use every day: your computer, your TV, your home phone, your mobile phone — all possess an IP address. Our world would not be the same without the Internet Protocol. But do [...]
Cisco Switching and Spanning Tree Protocol (STP) Basics
By Stelios Antoniou ⋅ November 1, 2007 ⋅ One comment
Switching is the process of using the physical address of devises to perform forwarding decisions. Switches use application specific integrated circuits (ASICs) to perform their switching function. As a consequence, amazingly fast switching speeds are accomplished. Today I will explain how switches learn the hardware address of hosts attached to them and how they use [...]
Networking Basics: TCP, UDP, TCP/IP and OSI Model
By Stelios Antoniou ⋅ October 29, 2007 ⋅ 21 comments
The Transmission Control Protocol/Internet Protocol (TCP/IP) suite was created by the U.S. Department of Defense (DoD) to ensure that communications could survive any conditions and that data integrity wouldn’t be compromised under malicious attacks. The Open Systems Interconnection Basic Reference Model (OSI Model) is an abstract description for network protocol design, developed as an effort [...]
Network Congestion Avoidance: WRED the Sophisticated Choice
By Stelios Antoniou ⋅ October 23, 2007 ⋅ 3 comments
My last article, on Simple Strategies to Eliminate Network Congestion Headaches, was an introduction to network congestion avoidance, where I covered queuing, queuing mechanisms, and dropping schemes. Today’s article focuses exclusively on Weighted Random Early Detection (WRED), which is a sophisticated network congestion avoidance mechanism. Weighted Random Early Detection is able to prioritize different traffic [...]
Warning: Your Wireless Communication Might Not Be Secure!
By Stelios Antoniou ⋅ October 17, 2007 ⋅ Post a comment
WLAN security is becoming more important as companies grow their wireless networks. Living in a world where illegality and selfish aspirations are increasingly revealed in our daily routine, security is most certainly a necessity. Private and confidential information has to be protected from exposure to undesirable recipients that could twist and use them in an [...]
Simple Strategies to Eliminate Network Congestion Headaches!
By Stelios Antoniou ⋅ October 11, 2007 ⋅ 2 comments
Congestion in networks that serve time-sensitive applications is an undesirable phenomenon. IP networks nowadays carry broadband voice and video. These applications have strict requirements regarding delay, delay variation and packet loss. Special, tactical measures need to be taken to fulfill those requirements. The only way to accomplish this is to avoid congestion in the network. [...]
Get to Know the H.323 VoIP Protocol Suite
By Stelios Antoniou ⋅ October 8, 2007 ⋅ 2 comments
In my previous post I wrote about the Session Initiation Protocol as one of the choices for VoIP services. Today, I’ll introduce you to the other end of the specctrum, H.323, and let you make the decision for yourself. The Need for an Internet Telephony Protocol Suite The evolution of TDM telephony into Voice over [...]
Learn QoS Using the DiffServ Model
By Stelios Antoniou ⋅ October 4, 2007 ⋅ Post a comment
What’s the Idea Behind the DiffServ Model? Differentiated Services, also known as DiffServ, eliminates the need for per-flow state and signaling at every hop. The DiffServ architecture pushes all the complexity to the edge of the network and hence eliminates the overhead associated with per flow traffic handling in the core of the network. This [...]
How to Troubleshoot Your Connections with Ping and Traceroute
By Stelios Antoniou ⋅ October 1, 2007 ⋅ 3 comments
The PING and TRACEROUTE utilities are two of the most popular and most helpful troubleshooting commands that every network administrator should know how to use. Both ping and traceroute utilize the ICMP protocol, which we’ll also take a closer look so we can better understand these tools.
Session Initiation Protocol: the Right Choice for VoIP
By Stelios Antoniou ⋅ September 25, 2007 ⋅ 2 comments
Session Initiation Protocol (SIP) is a standard designed by the Internet Engineering Task Force (IETF) to serve VoIP services. It’s an application layer protocol that can operate over UDP (User Datagram Protocol) or TCP (Transmission Control Protocol). SIP, currently at version 2, is defined in RFC 3261. Simplicity and flexibility are the primary characteristics of [...]
A Short Guide to Internet Control Protocols
By Stelios Antoniou ⋅ September 20, 2007 ⋅ 2 comments
The "heart" of the Internet as we know it today is the Internet Protocol (IP) which is responsible for routing data to the appropriate destination. It belongs to the group of routed protocols like IPX (Internetwork Packet Exchange), but unlike other routed protocols, the IP was designed to serve the Internet and its internetworks. In [...]
New Training Release: Cisco CCNP ONT Training
By Kasia Lorenc ⋅ September 19, 2007 ⋅ Post a comment
Cisco ONT Training Covering The New 642-845 Exam More organizations are moving toward converged networks — one network for voice, data, and video. And that’s why the new Cisco ONT Exam has changed its focus significantly from troubleshooting networks to actually making networks more efficient. Our new Cisco ONT CCNP Training covers all the new [...]