A load balancer is a device that acts as a reverse proxy and distributes network or application traffic across a number of servers. Load balancers are used to increase capacity (concurrent users) and reliability of applications. They improve the overall performance of applications by decreasing the burden on servers associated with managing and maintaining application and network sessions, as well as by performing application-specific tasks.

Load Balancer Engineer is generally grouped into two categories: Layer 4 and Layer 7. Layer 4 load balancers act upon data found in network and transport layer protocols (IP, TCP, FTP, UDP). Layer 7 load balancers distribute requests based upon data found in application layer protocols such as HTTP.

Requests are received by both types of load balancers and they are distributed to a particular server based on a configured algorithm. Some industry-standard algorithms are:

• Round robin
• Weighted round-robin
• Least connections
• Least response time

CompTIA Linux+ Certification demonstrates competence as a Linux Administrator.

Linux continues to make huge inroads into mainstream IT infrastructures, proving itself to be an economical and practical solution for everyday business tasks. As more organizations adopt Linux, the demand for skilled and qualified Linux Administrators is on the rise. The CompTIA Linux+ certification is the preeminent credential validating vendor-neutral skills as a Linux Administrator.

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CompTIA Linux+ certification covers the skills needed to install and support the Linux Operating System, including user administration, file permissions, software configurations and the fundamental management of Linux systems. Linux+ certified professionals can work at the Linux command line, perform day-to-day Linux maintenance tasks, effectively assist Linux users, and install and configure Linux workstations.

CompTIA Linux+ certification is often used as a stepping stone towards advanced vendor-specific Linux certificates, such as those from Oracle and Novell.