Motherboard, Mainboard and Microprocessor Information

As a CCNA candidate, you most likely have some background in PC hardware and workstation support. If so, you're already familiar with loopback interfaces, particularly 127.0.0.1, the loopback address assigned to a PC.

Microprocessor Design When you're learning all about the different physical interfaces for your CCNA exam - serial, ethernet, and BRI, among others - there's one logical interface you need to know about, and that is - you guessed it! - the loopback interface.

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Intel Motherboard What isn't as immediately apparent is why we use loopback interfaces on routers and switches to begin with. Many of the Cisco router features that can use loopbacks are intermediate and advanced features that you'll learn about in your CCNP and CCIE studies, but these features all come back to one basic concept: If the loopback interface on a router is down, that means the router is unavailable as a whole.

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Gigabyte Mainboard In contrast, a physical interface being down does not mean the router itself is out of commission. A router's ethernet port can go down, but the other physical interfaces on that router are still operational. Since a loopback interface is logical, there's nothing physical that can go wrong with it.

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History Of Microprocessor As I mentioned, you'll learn different Cisco router and switch features that utilize loopback interfaces as you climb the Cisco certification ladder. There's one misconception about Cisco loopback interfaces that you want to get clear on now, though. You're probably familiar with loopback interfaces on a PC, and may even know that the address range 127.0.0.0 is reserved for loopback addressing.

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Ecs Motherboard Note that this reserved address range does not apply to loopbacks on Cisco devices, however. If you attempt to assign an address from this range to a Cisco loopback interface, you get this result:

The A+ Core Hardware exam tests your knowledge of the central role played by the system's microprocessor, which has become essential knowledge for the professional PC repairperson. There was a time when replacing the CPU was very complicated. However, today's motherboards feature sockets and slots into which several types and versions of microprocessors can be interchanged. You still have to watch out for compatibility issues, but it's not uncommon for customers to want you to upgrade their PC instead of replace it.

Mainboard Driver R1#conf t

Computer Motherboard Enter configuration commands, one per line. End with CNTL/Z.

Asus Mainboard R1(config)#interface loopback0

Microprocessor Programming R1(config-if)#ip address 127.0.0.2 255.255.255.0

Socket Motherboard Not a valid host address - 127.0.0.2

Ecs Mainboard R1(config-if)#ip address 127.1.1.1 255.255.255.0

Motherboard Manual Not a valid host address - 127.1.1.1

Shuttle Mainboard The range 127.0.0.0 is reserved for host loopbacks (such as PCs), not routers or switches. The most commonly used address from this range is 127.0.0.1 - if you can't ping that on a workstation, that means you can't ping yourself, which means there's a problem with the TCP/IP install itself.

Microprocessor Architecture Keep these details in mind on the exam and in the workplace, and you're on your way to CCNA exam success!

Biostar Mainboard

Motherboard Review Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (http://www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, Ultimate CCNP Study Packages, and CCNA CBT video training. Pass the CCNA exam ,BSCI exam , and BCMSN exam with Chris Bryant, CCIE #12933!

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