GTM

Concept questions on what GTM is, the DNS service and domains, records and distribution, Disaster Recovery and Datacenter modes, health checks and monitoring. Search for a question, filter by level or jump to a category.

01FundamentalsWhat GTM is, how it relates to the Load Balancer and how DNS-based routing works

• What is GTM (Global Traffic Manager) and what does it do?GTM-01-001
• What is the difference between GTM and the Load Balancer?GTM-01-002
• How does DNS-based traffic management work; when is the decision made?GTM-01-003
• What are the basic building blocks of GTM?GTM-01-004
• I have a single data center; do I need GTM?GTM-01-005
• Can I use GTM only as an authoritative DNS server?GTM-01-006
• How are GTM and the Load Balancer used together?GTM-01-007
• What are the limits of DNS-based routing; how do TTL and the resolver cache affect the decision?GTM-01-008

02DNS Service and DomainsDNS service, domains, operating modes, Express profiles and the DNS Forwarder

• What is a DNS Service in GTM?GTM-02-001
• What is a domain in GTM; how does it relate to a DNS Service?GTM-02-002
• What is the difference between the Standalone, Disaster Recovery and Datacenter modes?GTM-02-003
• What is the difference between Local and Express record management?GTM-02-004
• What is an Express Profile; how does it relate to zone transfer?GTM-02-005
• What is the DNS Forwarder; what happens to queries GTM is not authoritative for?GTM-02-006

03Records and DistributionGTM records, distribution algorithms, topology, fail-safe and TTL

• What is a DNS record in GTM; which record types are supported?GTM-03-001
• Which distribution algorithms are available between several addresses in a record?GTM-03-002
• What is Topological Selection; how does GTM determine the client's location?GTM-03-003
• What is fail-safe; what does GTM answer if no address is healthy?GTM-03-004
• What does a record's TTL determine; how should it be chosen in GTM?GTM-03-005

04Disaster Recovery and DatacenterPrimary/backup data center switchover, distribution across data centers and Remote Devices

• How does the switchover between the primary and backup data centers work in Disaster Recovery mode?GTM-04-001
• What are the Disaster Recovery conditions; is the switchover automatic or manual?GTM-04-002
• How is traffic distributed across data centers in Datacenter mode?GTM-04-003
• What is a Remote Device; how does GTM monitor a remote data center?GTM-04-004
• What do the Remote Device status values mean?GTM-04-005

05Health Checks, Scenarios and TriggersGTM health checks, health scenarios and trigger actions

• What is a health check in GTM; how does it differ from a Load Balancer health check?GTM-05-001
• What is a health scenario; how does it combine several checks?GTM-05-002
• What is a Trigger Action; what does it do in which situations?GTM-05-003
• How does a Health Check result affect the DNS answer?GTM-05-004

06Monitoring, Security and ClusterGTM monitoring screens, query logs, DNSSEC and cluster behavior

• Which monitoring screens does GTM have; what does each one show?GTM-06-001
• Can GTM log DNS queries; where are the logs shown?GTM-06-002
• How does DNSSEC work in GTM?GTM-06-003
• How does GTM behave in a cluster?GTM-06-004