DNS and Network Security Questions

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Questions and Answers

What is the purpose of a Certificate Authority (CA)?

To decrypt X.509 certificates

To issue and sign X.509 certificates (correct)

To store X.509 certificates

To encrypt X.509 certificates

What is the purpose of an extended attribute in Linux?

To encrypt a file for secure transmission

To mark a file as executable

To store additional metadata about a file (correct)

To compress a file to save disk space

Which of the following DNS records are used in DNSSEC?

TXT

PTR

RRSIG (correct)

Which method can be used to deactivate a rule in Snort?

By placing a # in front of the rule and restarting Snort Signup and view all the answers

What is the purpose of TSIG in DNS?

To sign DNS messages for secure communication Signup and view all the answers

What is the purpose of the Linux Audit system?

To monitor system calls and identify potential security threats Signup and view all the answers

Which file is used to configure rkhunter?

/etc/rkhunter.conf Signup and view all the answers

What is the purpose of IP sets?

They group together IP addresses that can be referenced by netfilter rules. Signup and view all the answers

Which directive is used in an OpenVPN server configuration to send network configuration information to the client?

push Signup and view all the answers

Which of the following sections are allowed within the Kerberos configuration file krb5.conf?

[plugins] Signup and view all the answers

Which type of attack exploits a vulnerability to gain elevated privileges?

An attack that exploits a vulnerability to gain elevated privileges Signup and view all the answers

What is the purpose of the pam_cracklib module?

To check new passwords against dictionary words and enforce complexity Signup and view all the answers

Which command adds users using SSSD’s local service?

sss_useradd Signup and view all the answers

What is the purpose of a PAM module?

To provide an additional layer of security for user authentication Signup and view all the answers

Which of the following options is used in a parameter file for setkey to create a new SPD entry?

spdadd Signup and view all the answers

What type of attack is a DNS flood attack?

An attack that floods a network or server with traffic to make it unavailable Signup and view all the answers

What is the purpose of a DNSKEY record in DNSSEC?

To sign a DNS zone Signup and view all the answers

What is host intrusion detection (HID)?

A system that monitors and detects potential security threats on a single computer or server Signup and view all the answers

What is the purpose of a Certificate Revocation List (CRL)?

A list of X.509 certificates that have been revoked by a particular CA Signup and view all the answers

What is phishing?

A type of social engineering attack Signup and view all the answers

What is the purpose of AIDE?

To detect intrusions and system changes Signup and view all the answers

Which type of DNS record is used to map an IP address to a hostname?

PTR Signup and view all the answers

What is social engineering?

A type of psychological manipulation Signup and view all the answers

What is the purpose of DNSSEC?

To provide authentication and integrity of DNS data Signup and view all the answers

Study Notes

DNS and DNSSEC

DNS records: RRSIG, NSEC, NSEC3, DS, PTR, and A records are used for different purposes in DNS.
PTR records are used to map an IP address to a hostname.
DNSKEY records are used to sign a DNS zone in DNSSEC.

Security Threats

Phishing is a type of social engineering attack that targets a specific user or organization to steal sensitive information.
Social engineering attacks aim to steal sensitive information by exploiting human psychology.

System Security

Host intrusion detection (HID) is a system that monitors and detects potential security threats on a single computer or server.
AIDE (Advanced Intrusion Detection Environment) is a tool that detects intrusions and system changes.

Password Management

pam_cracklib is a PAM module that checks new passwords against dictionary words and enforces complexity.

Network Security

TSIG is used to sign DNS messages for secure communication in DNS.
IP sets group together IP addresses that can be referenced by netfilter rules.
iptables is a command used to configure firewall rules in Linux.

Linux System Management

Extended attributes in Linux are used to store additional metadata about a file.
rkhunter is a tool that scans for rootkits and other malicious software, and is configured using the /etc/rkhunter.conf file.

Networking and Firewall Configuration

setkey is a command used to configure IPsec policies and create new SPD entries.
Snort is a network intrusion detection system that can be configured using rules files.

User Management

SSSD (System Security Services Daemon) is a service that provides access to remote directories and authentication mechanisms.

Certificates and Encryption

A Certificate Revocation List (CRL) is a list of X.509 certificates that have been revoked by a Certification Authority (CA).
A CA is an entity that issues and signs X.509 certificates.
OpenVPN is a VPN solution that uses X.509 certificates for authentication and encryption.

Kerberos Configuration

The krb5.conf file is used to configure Kerberos settings, and allows sections such as [plugins], [domain], [capaths], and [realms].
The push directive is used in OpenVPN server configuration to send network configuration information to the client.

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Description

Test your knowledge of DNS records and network security concepts with these challenging questions. Covering topics such as RRSIG, NSEC, and host intrusion detection, this quiz is perfect for IT professionals and students.