F5 Networks BIG-IP DNS Specialist 302 Exam Questions

Answer : A, B

After creating a DNSSEC Zone, it is essential to submit the DS Record of the Zone to the Admin of the Parent Zone. This step ensures that the parent zone can sign the DS Record with its own keys and upload it to their zone, establishing a chain of trust in the DNSSEC infrastructure.

The process of DNSSEC involves the parent zone signing the DS Record submitted by the child zone with its own keys. This signed DS Record is then uploaded to the parent zone, completing the chain of trust in the DNSSEC setup. Deleting the DS Record would break this chain and compromise the security of the DNS infrastructure.

Domain

F5 GTM Security

Answer : A

The Second level Domain in the FQDN 'www.f5.com' is 'f5.com'. The Second level Domain is the part of the domain name that is located immediately to the left of the top-level domain (TLD), in this case, '.com'. It represents the organization or entity that owns the domain name.

Answer : A

The top-level domain is managed by a delegated organization from IANA (Internet Assigned Numbers Authority). IANA is responsible for coordinating the global Internet's DNS root, IP addressing, and other Internet protocol resources.

Answer : A

Root hints in the Local DNS contain the DNS records that point to the name servers of the root domains. These records help the Local DNS server to resolve queries for top-level domains by providing information about the authoritative name servers for the root domain.

Answer : A

The '-x' filter in the tcpdump command displays the output in both ASCII and hexadecimal format. This can be useful for analyzing network traffic and understanding the data being transmitted.

Domain

TCPDUMP

Answer : A

Recursive Query in DNS refers to the process where the DNS server will continue to query other servers on behalf of the client until it gets a resolution or an error message indicating that the Fully Qualified Domain Name (FQDN) doesn't exist. This means that the DNS server will not just provide a referral to another server but will actively seek the answer for the client.

In a Recursive Query, the DNS server itself will query other DNS servers to resolve the query on behalf of the client. This means that the DNS server takes full responsibility for finding the answer to the query and does not rely on the client to perform additional queries.

Domain

DNS Data flow

Answer : A

True. Recursion is disabled by default in F5 GTM System for security reasons. Enabling recursion can potentially lead to DNS amplification attacks and other security vulnerabilities, so it is recommended to keep it disabled unless specifically required for certain configurations.

Domain

DNS Data flow