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DNS training
DNS Training Description:
Reliable and robust operation of the DNS hierarchy - from the root servers to an individual domain name server - is critical to all Internet operations. The course covers the configuration and operation of DNS systems used for a variety of purposes from high availability Zone Masters and Slaves running mission critical sites to caching servers used to speed up Internet access. While the primary focus of the course is BIND other DNS software will be discussed. BIND supports Linux, BSD and Windows platforms - installation procedures for each platform are covered.
Students will learn the theory behind the DNS hierarchy, the DNS protocol, forward and reverse mapping zone files. The major Zone file Resource Records (SOA, NS, MX, CNAME, A, PTR, TXT, SRV and NAPTR) are described and explained in detail. A number of DNS types are introduced - including Master/Slave, Caching Only, Authoritative Only, Forwarding and Stealth - and the detailed zone files and BIND configuration files (named.conf) to control operational behavior are presented. Dynamic DNS, (DDNS), integration with DHCP, Zone Transfer, Diagnostic tools and simple security models are also covered. The course includes a number of hands on configuration exercises.
The primary focus of the course is BIND which is available on Linux, UNIX and Windows platforms. The course is offered with Linux (Fedora Core), FreeBSD or Windows 2003 as the platform for all exercises.
DNS Training Audience:
The course is designed for DNS administrators, Network and System Administrators and those who need a thorough understanding of the DNS.
DNS Training Course duration:
2 or 3 days. If three days the last day is the Advanced DNS Course
DNS Training Course outline:
Module 1: DNS Theory
- History of Name Servers
- DNS Organization
- The elements of a domain name
- Authority and Delegation
- DNS Operational Hierarchy (name servers and resolvers)
- The DNS protocol
- DNS Queries (recursive and iterative)
- Zone transfer (AXFR and IXFR)
- NOTIFY
Module 2: Domains and Zones
- Forward Mapping
- Reverse Mapping
- Zone File Construction - best practices
- Resource Records (RRs)
- SOA RR
- NS RR
- MX RR
- CNAME RR
- A (IPv4) and AAAA (IPv6) RRs
- PTR RR
- TXT RR (SPF)
Module 3: Major DNS Types
- Master DNS
- Slave DNS
- Caching DNS
- Forwarding (Proxy) DNS
- Stealth DNS
- Authoritative Only DNS
Module 4: Installing BIND
- Installation of BIND on Linux (FreeBSD and Windows)
- The default chroot installation
- Starting and stopping BIND
- RNDC default install
- DIG/NSLOOKUP basics
Module 5: BIND Configuration
- BIND's named.conf layout and principles
- The controls clause
- The logging clause
- The options clause
- The zone clause
- The ACL clause
- BINDs view clause
- Essential zone files
- Configuration exercise
Module 6: DNS and Ipv6
- Forward mapping - the AAAA RR
- Reverse mapping - the PTR and DNAME RR
Module 7: Advanced Zone Files
- Load balancing
- In-zone and out-of-zone records
- Parent and child domains
- Subdomain delegation
- Glue Records
- SRV RR
- NAPTR RR
- Configuration exercise
Module 8: DNS Tools and Diagnostics
- DIG
- NSLOOKUP
- RNDC
- Validation utilities
- Log analysis
- Exercises
Module 9: Dynamic DNS (DDNS)
- DDNS - theory and implications
- Using nsupdate
- Disabling and controlling DDNS
- Exercise
Module 10: Advanced Topics
- DNS and DHCP (auto-update)
- Security overview
- Open and closed DNS
- DNS uses - DNSBL, ENUM
- DNS best practise
- DNS Resources
