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Ethernet Protocol, CSMA/CD, Collisions
The IEEE 802.3 specification states that before a station can attempt to transmit on the wire, it must first wait until it has heard 9.6 microseconds of silence. Many popular myths have arisen surrou…
Cisco CallManager-CCME
This article explains how to reset your Cisco 7940, 7941, 7942, 7960, 7961, 7962 & 7920 IP phone to factory defaults, and how to upgrade its firmware to the latest available version. When initia…
Linux - Unix
This article was written thanks to our recent encounter of a HP DL120 G7 rack mount server equipped with a HP Smart Array B110i SATA Raid controller, needed to be installed with the Linux CentOS 6.0…
Cisco Data Center (Nexus/UCS)
The Cisco NX-OS checkpoint feature provides the capability to capture at any time a snapshot (backup) of the Cisco Nexus configuration before making any changes. The captured configura…
Linux - Unix
Installing software in Linux is very different from Windows for one very simple reason: most Linux programs come in 'source code' form. This allows you to modify any program (if you're a programmer)…
Network Fundamentals
Measuring network performance has always been a difficult and unclear task, mainly because most engineers and administrators are unsure which approach is best suited for their LAN or WAN network. A…
Cisco Switches
This article explains the procedure that should be followed to correctly shutdown/powerdown a Cisco Nexus 7000 series module and remove it from the chassis. We also include important tips that will h…
Network Protocol Analyzers
This article will help you understand TCP SYN Flood Attacks, show how to perform a SYN Flood Attack (DoS attack) using Kali Linux & hping3 and correctly identify one using the Wireshark protocol…
Cisco Routers
GRE Tunnels are very common amongst VPN implementations thanks to their simplicity and ease of configuration. With broadcasting and multicasting support, as opposed to pure IPSec VPNs, they tend to b…
Cisco Routers
NAT (Network Address Translation) is a method that allows the translation (modification) of IP addresses while packets/datagrams are traversing the network. Dynamic NAT enables multiple internal host…
Network Address Translation - NAT
After that simple and informative introduction to the NAT concept, it's time to find out more about how it works and this is where the NAT table comes in. The Network Address Translation (NAT) Table…
Cisco CallManager-CCME
Unity Express is a popular add-on for Cisco Unified Communication Manager Express (CallManager Express) and Cisco Unified Communication Manager (CUCM), adding advanced auto attendant functionality wi…

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