A list of certificates (serials) that a CA has revoked.
Certificates are commonly revoked if they are compromised, or issued to an employee who has left the organization.
The Certificate Authority (CA) that issued the certificate publishes a CRL, and a CRL is public.
Card 42
Question
CSR
Answer
Control Status Register.
A register in a processor used for temporary storage of data.
Card 43
Question
CSU
Answer
Channel Service Unit.
A line bridging device used with T1 and similar lines.
It typically connects with a DSU as a CSU/DSU.
Card 44
Question
CTO
Answer
Chief Technology Officer.
A "C" level executive position in some organizations.
CTOs focus on technology and evaluate new technologies.
Card 45
Question
CVE
Answer
Common Vulnerabilities and Exposures (CVE).
A dictonary of publicly known security vulnerabilities and exposures.
Card 46
Question
DAC
Answer
Discretionary Access Control.
An access control model where all objects have owners and owners can modify permissions for the objects (files and folders).
Microsoft NTFS uses the DAC model.
Other access control models are MAC and RBAC.
Card 47
Question
DACL
Answer
Discretionary Access Control List.
List of Access Control Entries (ACEs) in Microsoft NTFS.
Each ACE includes a security identifier (SID) and a permission.
Card 48
Question
DBA
Answer
Database administrator.
A DBA administers databases on database servers.
Card 49
Question
DBA
Answer
Database administrator.
A DBA administers databases on database servers.
Card 50
Question
dBd
Answer
Decibels-dipole.
Identifies the gain of an antenna compared with a type of dipole antenna.
Higher dBd numbers indicate the antenna can transmit and receive over greater distances.
Card 51
Question
dBi
Answer
Decibels-isotropic.
Identifies the gain of an antenna and is commonly used with omnidirectional antennas.
It references an isotropic antenna that can theoretically transmit the signal equally in all directions.
Higher numbers indicate the antenna can transmit and receive over greater distances.
Card 52
Question
dBm
Answer
Decibels-milliwatt.
Identifies the power level of the WAP and refers to the power ratio in decibels referenced to one milliwatt.
Higher numbers indicate the WAP transmits the signal over a greater distance.
Card 53
Question
DDoS
Answer
Distributed denial-of-service.
An attack on a system launched from multiple sources intended to make a computer’s resources or services unavailable to users.
DDoS attacks typically include sustained, abnormally high network traffic.
Card 54
Question
DEP
Answer
Data Execution Prevention.
A security feature in some operating systems.
It helps prevent an application or service from executing code from a nonexecutable memory region.
Card 55
Question
DES
Answer
Digital Encryption Standard.
An older symmetric encryption standard used to provide confidentiality.
DES is a block cipher and it encrypts data in 64-bit blocks.
DES uses 56 bit keys and is considered cracked.
Use AES instead, or 3DES if the hardware doesn’t support AES.
Card 56
Question
DHCP
Answer
Dynamic Host Configuration Protocol.
A service used to dynamically assign TCP/IP
configuration information to clients.
DHCP is often used to assign IP addresses, subnet masks, default gateways, DNS server addresses, and much more.
Card 57
Question
DHE
Answer
Data-Handling Electronics.
Term used at NASA indicating electronic systems that handle data.
Card 58
Question
DHE Key
Answer
Diffie-Hellman Ephemeral Key
An alternative to traditional Diffie-Hellman.
Instead of using static keys that stay the same over a long period, DHE uses ephemeral keys, which change for each new session. Sometimes listed as EDH.
Card 59
Question
DLL
Answer
Dynamic Link Library.
A compiled set of code that can be called from other programs.
Card 60
Question
DLP
Answer
Data loss prevention.
A network-based DLP system can examine and analyze network traffic.
It can detect if confidential company data or any PII data is included in email and reduce the risk of internal users emailing sensitive data outside the organization.
Endpoint DLP systems can prevent users from copying or printing sensitive data.
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