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RHEL Tutorial 15 (Caching Only Name Server) : Linux Tutorials : Linux Caching DNS Configuration Video Lecture | RHEL (Red Hat Enterprise Linux): Basic Tutorials - Back-End Programming

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FAQs on RHEL Tutorial 15 (Caching Only Name Server) : Linux Tutorials : Linux Caching DNS Configuration Video Lecture - RHEL (Red Hat Enterprise Linux): Basic Tutorials - Back-End Programming

1. What is a caching-only name server?
Ans. A caching-only name server is a DNS server that does not act as an authoritative name server for any domain but instead caches DNS information from other name servers. It helps to improve DNS resolution speed by storing frequently accessed DNS records locally.
2. How does a caching-only name server work?
Ans. When a caching-only name server receives a DNS query, it first checks its local cache for the requested information. If the information is present, it immediately returns the response. If the information is not in the cache, the caching-only name server queries other authoritative name servers to obtain the required information and stores it in its cache for future use.
3. What are the benefits of using a caching-only name server?
Ans. Using a caching-only name server offers several benefits, including: - Improved DNS resolution speed: By storing frequently accessed DNS records locally, the caching-only name server can provide faster responses to DNS queries. - Reduced network traffic: As the caching-only name server can serve DNS responses from its cache, it reduces the need for external DNS queries, thereby reducing network traffic. - Increased reliability: Even if the authoritative name servers are unavailable, the caching-only name server can still provide DNS resolution for previously cached records.
4. How to configure a caching-only name server in RHEL?
Ans. To configure a caching-only name server in RHEL, follow these steps: 1. Install the "bind" package using the package manager. 2. Edit the "/etc/named.conf" file to configure the caching-only name server. 3. Set up the "options" section in "named.conf" to specify the DNS forwarders and enable caching. 4. Create a zone file for the loopback address in "/var/named" directory. 5. Start the DNS service and enable it to start automatically on system boot.
5. Can a caching-only name server be used in a corporate network?
Ans. Yes, a caching-only name server can be used in a corporate network. It can help in reducing DNS resolution time for frequently accessed domains and improve overall network performance. Additionally, by caching DNS records locally, it can also reduce external DNS queries and lower network traffic.
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