server b requests a secure record exchange from server a. server a returns a package along with a public key that verifies the signature. what does this scenario demonstrate?

In order to lessen the impact of spoofing and poisoning attacks, DNS Security Extensions are used. An RRset, a collection of resource records signed with the zone signing key using a private key, is created by the authoritative server for the zone.

A redirection attack called "DNS server cache poisoning" aims to tamper with the DNS server's own records.

Attacks that compromise the name resolution process include DNS spoofing. By substituting a valid IP address for a reliable website, the attacker could compromise the DNS resolution procedure.

An automatic method for allocating network addresses is provided by the Dynamic Host Configuration Protocol (DHCP).

There is a public/private key pair for each DNS zone. To sign DNS data in the zone and create digital signatures over it, the zone owner uses the zone's private key.This key material is kept a secret by the zone owner, as suggested by the name "private key." However, anyone can access the zone's public key because it is published in the zone itself.

Any recursive resolver that searches the zone for information also gets the zone's public key, which it uses to confirm the validity of the DNS data.

The resolver verifies the validity of the digital signature covering the retrieved DNS data. If so, the user receives valid DNS data back from the server. The resolver assumes an attack if the signature does not validate, discards the data, and informs the user of the error.

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