Computer Questions Answered

Permissions

Every file on the system has associated with it a set of permissions. Permissions tell UNIX what can be done with that file and by whom. There are three things you can (or can't) do with a given file:

* read it, (r)
* write (modify) it (w)
* execute it (x)

For Example:
Triplet for u: rwx => 4 + 2 + 1 = 7
Triplet for g: r-x => 4 + 0 + 1 = 5
Tripler for o: r-x => 4 + 0 + 1 = 5
Which makes : 755

Further Reading: http://www.perlfect.com/articles/chmod.shtml

CCNA Certification

Cisco Certified Network Associate (CCNA®) validates the ability to install, configure, operate, and troubleshoot medium-size route and switched networks, including implementation and verification of connections to remote sites in a WAN. CCNA curriculum includes basic mitigation of security threats, introduction to wireless networking concepts and terminology, and performance-based skills. This new curriculum also includes (but is not limited to) the use of these protocols: IP, Enhanced Interior Gateway Routing Protocol (EIGRP), Serial Line Interface Protocol Frame Relay, Routing Information Protocol Version 2 (RIPv2),VLANs, Ethernet, access control lists (ACLs).

CCNA syllabus

Partners: Log in Partner E-Learning Connection (PEC) learning map

* CCNA Learning Map


CCNA Prerequisites
No prerequisites

CCNA Exams & Recommended Training
Required Exam(s)

Recommended Training
640-802 CCNA Interconnecting Cisco Networking Devices Part 1 (ICND1) v1.0
Interconnecting Cisco Networking Devices Part 2 (ICND2) v1.0
OR
Required Exam(s)

Recommended Training
640-822 ICND1 Interconnecting Cisco Networking Devices Part 1 (ICND1) v1.0
640-816 ICND2 Interconnecting Cisco Networking Devices Part 2 (ICND2) v1.0

CCNA Recertification

CCNA certifications are valid for three years. To recertify, pass the ICND2 exam, or pass the current CCNA exam, or pass4sure 1Y0-A05 pass a CCNA Concentration exam (wireless, security, voice), or pass the current CCDA exam, or pass any 642 - XXX professional level or Cisco Specialist exam (excluding Sales Specialist exams), pass4sure 642-383 or pass a current CCIE or CCDE written exam.

Additional Information

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pass4sure 642-873

The change of microprocessor architectures Intel occurs every two years. Computing power is growing, the flagship of the recent past are transformed into outsiders, yielding a strong representative of the new architecture. With the withdrawal of the market in November 2008 processor-based architecture Nehalem, Intel has significantly strengthened its position in the Hi-End sector desktops. And the recent top-model in the series Core 2 Quad and Core 2 Duo processors could not JN0-331
1z0-051
compete with processors Core i7, so they had to shift in mid-market niche, making room in the segment of high-performance Hi-End newcomers.
Further plans include 642-681
E20-322 expansion of Intel's new architecture of the presence of representatives of all segments of the market. However, the line Core i7 in its original form did not able to fit into the budget and medium budget desktop PC. That is why for the masses engineers have developed a "lightweight" series CPU based on the architecture of Nehalem. Today, Intel officially introduced three new microprocessors - Core i7 870, Core i7 860 and Core i5 750, designed to work in the processor socket LGA 1156.

Processors Intel Core i5 at the nucleus Lynnfield designed to work with Socket LGA 1156, which, in fact, not much different from the connectors Socket LGA 775/LGA 1366. Is that little has changed the mechanism of fixation CPU, as well as the location of holes for fastening the cooling system.

Memory controller:

All processors are designed to work in a motherboard with socket LGA 1366, have a three-channel integrated memory controller, DDR-3, which provides extremely high memory bandwidth. Processor Core i5, designed for Socket LGA 1156, have a dual-integrated memory controller, which may somewhat reduce its capacity. However, testing the memory subsystem will show how great a difference in the CAP.

Hyper-Threading Technology:

For the first time this technology has emerged in the days of the Pentium 4 architecture Net Burst. All processorspass4sure PW0-104 Intel Core i5, regardless of application design, support HT, which enables them to perform up to 8 processing threads simultaneously. Processor Series Intel Core i5 support Hyper-Threading denied.
Mode Turbo Boost:
pass4sure VCP-410

The essence of this regime is to increase the operating frequency of one or more processor cores, depending on the computational load by increasing the CPU multiplier. Processors designed for operation in pass4sure 642-359 Socket LGA 1156, depending on the load can be "accelerated" by 1-5 degrees for a series of Core pass4sure 1z0-047 i5. Obviously, the Turbo Boost technology has reached a certain maturity, and the new Intel processors are able to add a frequency significantly greater than previously. Furthermore, it is worth noting an interesting trend. Modern technology from Intel enables the processor to "intelligently" to allocate their forces to achieve maximum results depending on the type of tasks performed