Dynamic routing protocols are used by Layer 3 network devices to automatically share routing information. Various routing protocols have been developed over the years, but most fall into one of three categories: Interior Gateway Protocol – Distance vector, such as EIGRP or RIP Interior Gateway Protocol – Link state, such as OSPF or IS-IS Exterior […]
[Continue reading]
A carpenter is only as good as his hammer. A knight is only as good as his sword. A writer is only as good as his pen. These experts would amount to very little if they didn’t have their respective tools to get their jobs done well. Similarly, a network administrator is only as good […]
[Continue reading]
A common attack found on TCP/IP networks is IP spoofing. This is usually used for Denial-of-Service, Identity hiding, or even to bypass firewalls or Access-Lists security rules. The spoofing attack works like that: A malicious attacker sends packets towards a target host. The attacker disguises itself by inserting a fake source IP into the packet. […]
[Continue reading]
Voice over IP (VoIP) is a technology that allows you to transmit voice over an IP network. This enables both telephony and data to be transmitted over the same network packet-based infrastructure. There are two fundamental protocols used to transmit the signaling that is necessary to make IP telephony operate correctly. These protocols are Session […]
[Continue reading]
The Internet Protocol (IP) is the fundamental protocol that enables end-to-end communication between hosts on the Internet. Living in the Network Layer of the OSI model, IP is able to reach the intended host by simply using the destination IP address and the routing protocols that have been configured on the networks between the hosts. […]
[Continue reading]
If your organization is growing, you know first-hand how important it is to have a network monitoring solution. But what do you do when your network starts to outgrow your current monitoring solution? Here is what you need to know about scaling based on your organizational goals. Your organization can efficiently tackle the ongoing and […]
[Continue reading]
Network Address Translation (NAT) is a feature that enables the translation of IPv4 addresses. It is most often used to translate private IPv4 addresses to public routable IPv4 addresses. This feature has almost singlehandedly vastly increased the longevity of the IPv4 protocol as the primary Network Layer protocol running on the Internet, since it resolves […]
[Continue reading]
Open Shortest Path First (OSPF) and Routing Information Protocol (RIP) are two of the most well-known Internal Gateway Protocols (IGPs) among network professionals and enthusiasts alike. Both are among the oldest routing protocols developed for IP networks, but they have evolved in very different ways, and are ultimately used today for very different purposes. Let’s […]
[Continue reading]
Open Shortest Path First (OSPF) and Enhanced Interior Gateway Protocol (EIGRP) are two of the most popular Internal Gateway Protocols (IGPs) employed in today’s modern IP networks. Both are mature protocols, having been around for decades, and are extremely reliable, flexible, and highly configurable. And yet, they are surprisingly dissimilar in their architecture, implementation, and […]
[Continue reading]
I have read tens of books (both in ebook format and also hard copy textbooks) in my networking professional career over the last 18 years. In fact, all of my preparation for my Cisco and other IT certifications was based on book studying (in addition to hands-on practice of course). Personally, I believe that having […]
[Continue reading]
In this tutorial we will describe how to setup a Cisco Meraki WiFi Access Point (AP) together with several other useful details, so let’s get started. A Meraki access point is different to a Cisco AireOS Access point because it doesn’t need a separate Wireless LAN Controller or an embedded controller such as Mobility Express […]
[Continue reading]
If you’ve ever wondered why your company’s network seems to slow down at times, or how efficiently your employees are using their networked devices, then it’s time you implement a network analysis strategy. Network Traffic Analyzer (NTA) tools can help you find bottlenecks in traffic, analyze what types of network traffic is being used within […]
[Continue reading]
PuTTY is a free terminal emulation tool that’s been available for 20 years. Originally released for Microsoft Windows, this versatile remote administration tool can be used to access workstations, servers, network devices etc using various protocols such as secure shell connection (SSH), Telnet, Rlogin etc. While it continues to be popular for accessing network devices […]
[Continue reading]