linux yum command

I’ve installed Red Hat Enterprise Linux 5.2 and I see virbr0 network interface along with my eth0 interface? What it is? How do I disable or remove virbr0?

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I would like to only download the packages via yum and not install/update them. How do I download a RPM package using yum command under CentOS Enterprise Linux server 5.x or RHEL 5.x systems?

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I know how to find out current running kernel version under CentOS Enterprise Linux 4.6 x86_64, but how do I find out latest available kernel version? How do I find out if it’s the latest one? How to find the latest release version for package called xyz or kernel package?

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By accident my yum command was deleted under Red Hat Enterprise Linux version 5.x. Now I’m not able to download and update system using RHN. How do I fix this issue without reinstalling RHEL again?

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How do I use yum command to update and patch my Red hat Enterprise Linux / CentOS Linux version 5.x server via RHN / Internet? Can I use up2date command under RHEL 5?

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How can I apply package updates from Red Hat Network (RHN) for my HP Red Hat Enterprise Linux Server?

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