Explore the concept of the DNS cache locking. This allows the ability to help secure the DNS cache.
- [Instructor] Since DNS is such a critical network service,…it's important that you try to protect it…as much as possible.…Now one way that we can help protect DNS is through…the use of something called DNS cache locking.…DNS cache locking is a security feature…that you can use to control when information…in the DNS cache can be overwritten.…So we've already learned that when a recursive DNS server…responds to a query, that server will cache the results…so that it can respond quickly if it happens to get…another query looking for the same information.…
The amount of time that the DNS server will hold on…to that information in the cache is determine by something…called the TTL or the time to live value.…So here's the deal, the way it's been set up is…that it's possible for that information in the cache…to be updated if there's more recent information…than when it was first put into the cache,…but like with many other features, we end up having…malicious users who ruin it for the rest of us.…So what the malicious users will do is they will go ahead…
Author
Released
2/5/2019- What is Dynamic Host Configuration Protocol (DHCP)?
- Setting up DHCP
- Securing and troubleshooting DHCP
- Configuring a DHCP relay agent
- Deploying Domain Name System (DNS)
- Creating stub zones and reverse lookup zones
- Testing queries
- DNS security
Skill Level Beginner
Duration
Views
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Introduction
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Course organization1m 40s
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1. Dynamic Host Configuration Protocol (DHCP) Overview
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What is DHCP?2m 14s
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Lease generation3m 29s
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Lease renewal3m 38s
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2. Setting Up DHCP
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Install the DHCP server role3m 54s
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Authorize a DHCP server3m 42s
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Create DHCP scopes5m 8s
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Configure DHCP options3m 33s
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Activate a scope3m 7s
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Configure DHCP clients6m 3s
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Configure DHCP reservations5m 13s
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3. Managing DHCP
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Reconcile DHCP scopes2m 36s
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Database statistics3m 28s
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Secure DHCP5m 39s
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Troubleshoot DHCP3m 55s
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4. DHCP Advanced Features
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Configure DHCP failover5m 9s
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Manage DHCP failover4m 2s
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DHCP in a routed environment2m 26s
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Configure a DHCP relay agent4m 22s
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Test relay agent3m 36s
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5. Deploying DNS (Domain Name System)
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DNS client configuration3m 59s
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6. DNS Zones
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Configure zone transfers4m 43s
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Create reverse lookup zones2m 40s
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7. DNS Resource Record Types
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Alias (CNAME) record3m 2s
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Mail exchanger (MX) record3m 28s
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8. Name Resoution
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DNS queries4m 10s
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Testing queries2m 12s
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DNS cache3m 19s
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Forwarding2m 31s
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Conditional forwarding3m 28s
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Caching only DNS servers3m 26s
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9. DNS Security
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DNS cache locking2m 32s
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DNS socket pool1m 18s
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Conclusion
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Next steps19s
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Video: DNS cache locking