Module 6: Managing and monitoring domain name system. This module provides you with the knowledge and skills to manage and monitor DNS servers to ensure that they are functioning properly and to optimize network performance. | Module 6: Managing and Monitoring Domain Name System Overview Managing DNS Records Testing the DNS Server Configuration Monitoring DNS Server Performance Lesson: Managing DNS Records What Is the Time to Live? What Are Aging and Scavenging Parameters? How Aging and Scavenging Work Practice: Managing DNS Records The records in the zone are sent to other DNS servers and clients in response to queries 1 Records are cached based on the TTL period supplied in the record 2 When the TTL expires, the record is removed from the cache 3 The Time to Live value indicates how long a record should be cached Zone TTL set on the zone DNS Server1 DNS Client Authoritative DNS Server2 What Is the Time to Live? Cache Resource Record Cache Resource Record What Are Aging and Scavenging Parameters? Parameter Description Example No-Refresh Interval DNS server does not accept refresh attempts 7 days (default) Refresh Interval DNS server does accept refresh attempts 7 days (default) Aging determines when a stale record should be removed from the DNS database Scavenging removes outdated or extinct names from the database A refresh attempt is the process of a computer renewing its DNS record How Aging and Scavenging Work Jan 1 Jan 15 Jan 8 Scavenge No-Refresh Interval Refresh Interval Time stamp Aging 7 days 7 days Practice: Managing DNS Records In this practice, you will: Modify the default TTL for a zone Modify the TTL for a record Configure aging and scavenging Lesson: Testing the DNS Server Configuration What Are Simple and Recursive Queries? Why Verify That a Resource Record Exists? What Is Nslookup? What Is Dnscmd? What Is Dnslint? Practice: Testing the DNS Server Configuration What Are Simple and Recursive Queries? A simple query performs a local test by using the DNS client to query the DNS server A recursive query tests a DNS server by forwarding a recursive query to another DNS server DNS Server DNS Service Authoritative zone: DNS . | Module 6: Managing and Monitoring Domain Name System Overview Managing DNS Records Testing the DNS Server Configuration Monitoring DNS Server Performance Lesson: Managing DNS Records What Is the Time to Live? What Are Aging and Scavenging Parameters? How Aging and Scavenging Work Practice: Managing DNS Records The records in the zone are sent to other DNS servers and clients in response to queries 1 Records are cached based on the TTL period supplied in the record 2 When the TTL expires, the record is removed from the cache 3 The Time to Live value indicates how long a record should be cached Zone TTL set on the zone DNS Server1 DNS Client Authoritative DNS Server2 What Is the Time to Live? Cache Resource Record Cache Resource Record What Are Aging and Scavenging Parameters? Parameter Description Example No-Refresh Interval DNS server does not accept refresh attempts 7 days (default) Refresh Interval DNS server does accept refresh attempts 7 days (default) Aging determines .
