303-300試験の準備方法｜実用的な303-300復習対策書試験｜素晴らしいLPIC Exam 303: Security, version 3.0関連資格試験対応

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Lpi 303-300 Exam Syllabus Topics:

Section	Weight	Objectives
Threats and Vulnerability Assessment	5%	- Penetration Testing - Common Security Vulnerabilities and Threats
Host Security	13%	- Host Hardening - Host Intrusion Detection - Resource Control
Network Security	17%	- Virtual Private Networks - Network Intrusion Detection - Packet Filtering - Network Hardening
Access Control	8%	- Mandatory Access Control - Discretionary Access Control
Cryptography	17%	- X.509 Certificates for Encryption, Signing and Authentication - Encrypted File Systems - X.509 Certificates and Public Key Infrastructures - DNS and Cryptography

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Lpi LPIC Exam 303: Security, version 3.0 認定 303-300 試験問題 (Q61-Q66):

質問 # 61
What is an asymmetric key?

A. A key used for decryption that is different from the key used for encryption
B. A key used for encryption and decryption that is the same
C. A key used for encryption that is different from the key used for decryption
D. A key used for both encryption and decryption that is generated in a pair

正解：D

質問 # 62
What is the purpose of the program snort-stat?

A. It displays statistics from the running Snort process.
B. It displays the status of all Snort processes.
C. It reports whether the Snort process is still running and processing packets.
D. It returns the status of all configured network devices.
E. It reads syslog files containing Snort information and generates port scan statistics.

正解：E

質問 # 63
Which of the following terms refer to existing scan techniques with nmap? (Choose TWO correct answers.)

A. UDP SYN Scan
B. FIN Scan
C. IP Scan
D. Xmas Scan
E. Zero Scan

正解：B、D

質問 # 64
What is the purpose of the GnuPG "trust level" assigned to a key, as opposed to a signature on that key?

A. It is identical in meaning to a key signature and is redundant.
B. It determines the key's expiration date.
C. It indicates how strongly the key's authenticity has been verified.
D. It indicates how much the owner trusts that key's holder to properly verify and sign other people's keys.

正解：D

解説：
A trust level in GnuPG is a personal, local judgment about how much a user trusts a particular key's owner to carefully and correctly verify the identity of others before signing their keys. This is distinct from a signature, which asserts that a specific key's authenticity has been verified. Trust levels (such as none, marginal, full, and ultimate) affect how GnuPG calculates the validity of other keys in the web of trust based on the chain of signatures connecting them back to the user's own key.

質問 # 65
What is the purpose of a Certificate Revocation List (CRL)?

A. It lists all valid certificates currently trusted by a client.
B. It replaces the need for certificate expiration dates.
C. It lists certificates that have not yet been issued.
D. It lists certificates that have been revoked by the issuing CA before their expiration date.

正解：D

解説：
A Certificate Revocation List (CRL) is a signed list published by a Certificate Authority that identifies certificates which have been revoked before their scheduled expiration date, for reasons such as key compromise or the certificate no longer being needed. Clients can download and check a CRL to determine whether a certificate they are relying on is still valid, though this approach has largely been supplemented or replaced in many contexts by the more efficient real- time OCSP protocol.

質問 # 66
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