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Topic 207: Domain Name Server

Perteneciente a LPIC-2

Módulos:

Lo importante de cara al examen:

Localización de los ficheros de configuración y utilidades de sevidor BIND.
Tipos de servidores DNS (master, slave, cache).
Definición de zonas.
Creación y modificación de ficheros de zonas directa e inversa.
Uso de directivas allow-query/allow-transfer.
Configuración Bind en chroot.
Conocimiento de DNSSEC.
Configuración y uso de firmas de transacción (TSIG).

Tests

What is the purpose of a PTR record?

To provide name to IP resolution.
To provide IP to name resolution. (Solución)
To direct email to a specific host.
To provide additional host information.
To direct clients to another nameserver .

Using only commands included with named, what is the command, with options or parameters, to make named re-read its zone files?

rndc reload

According to the configuration below, what is the e-mail address of the administrator for this domain?

$TTL 86400
$ORIGIN certkiller.com
@    IN    SOA    mars.certkiller.com. hostmaster.certkiller.com. (
                  2005020801
                  10800
                  3600
                  604800
                  86400 );

hostmaster@certkiller.com

The mailserver is currently called fred, while the primary MX record points to mailhost.example.org. What must be done to direct example.org email towards fred?

Add an A record for mailhost to fred's IP address.
Add a CNAME record from mailhost to fred. (Solución)
Add another MX record pointing to fred's IP address.
Add a PTR record from mailhost to fred.

Sería algo como:

fred    IN    CNAME    mailhost.example.org.

DNSSEC is used for?

Encrypted DNS queries between nameservers.
Cryptographic authentication of DNS zones. (Solución)
Secondary DNS queries for local zones.
Defining a secure DNS section.
Querying a secure DNS section.

No se cifra la información, solo se firma para verificar la autenticidad.