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Free Webinar: Enterprise-Grade Security and Manag…
The hybrid work culture has resulted in workforces increasingly using their mobile devices for work, further adding to the complexity of ensuring security across all endpoints within organizations…
How to Register Cisco IP Phones & Connect CallMan…
This article shows how to connect Cisco's Unified CallManager with a CallManager Express system (including UC520, UC540 and UC560) via H323 gateway, allowing the two systems to route calls between ea…
The OSI Model: Layer 5 - Session Layer
The Session layer is responsible for setting up, managing and then tearing down sessions between Presentation layer entities. The Session layer also provides dialog control between devices, or nodes…
ICMP Protocol - Part 7: Time Exceeded Message Ana…
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…
VPN Hotspot - How to Stay Safe on Public & Guest…
Is Guest WiFi Safe?
It’s hard to go to a pub, café, or hotel these days without running into public or guest WiFi. In many cases, an internet connection can feel like a necessity – keeping up with w…
Linux BIND DNS - Part 5: Configure Secondary (Sla…
Setting up a Secondary (or Slave) DNS sever is much easier than you might think. All the hard work is done when you setup the Master DNS server by creating your database zone files and configuring th…
Configuring Windows 7 To Provide Secure Wireless…
Not many people are aware that Windows 7 has built-in capabilities that allow it to be transformed into a perfectly working access point so that wireless clients such as laptops, smartphones and othe…
Introduction to Cisco VIRL – Virtual Internet Rou…
One of the most difficult things for people who are starting out in a networking career is getting their hands on the equipment. Whether you are studying for Cisco certification or just wanting to te…
Troubleshooting Cisco VPN Client Windows 7 - How…
This article shows how to fix the Cisco VPN Reason 442: Failed to enable Virtual Adapter error on the Windows 7 (32bit or 64bit) operating system. If you are a Windows 7 user, it's most likely you've…
Resolving Cisco Router/Switch Tftp Problems: Sour…
When working with Cisco equipment that has multiple ip interfaces, a common problem engineers are faced with is trying to successfully tftp to or from the Cisco device. This issue is usually encounte…
How to Add and Remove Applications from Windows 8…
In this article, we'll show you how to add (pin) and remove (unpin) any application from the Windows 8 or Windows 8.1 Metro Start Screen. Tiles or the small squares and rectangles appearing on the Wi…
UDP Protocol - Header
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…
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