WGU D488 FINAL TEST PAPER 2026 FULL
QUESTIONS AND SOLUTIONS VERIFIED A+
◉ denial of service (DoS). Answer: Any type of physical, application,
or network attack that affects the availability of a managed resource.
◉ dense wavelength division multiplexing (DWDM). Answer:
Technology for multiplexing 40 or 80 signal channels on a single
fiber using different wavelengths.
◉ dhcp relay. Answer: Configuration of a router to forward DHCP
traffic where the client and server are in different subnets.
◉ dictionary. Answer: Type of password attack that compares
encrypted passwords against a predetermined list of possible
password values.
◉ differentiated services (DiffServ). Answer: Header field used to
indicate a priority value for a layer 3 (IP) packet to facilitate quality
of service (QoS) or class of service (COS) scheduling.
,◉ dig command. Answer: Utility to query a DNS and return
information about a particular domain name.
◉ digital certificate. Answer: Identification and authentication
information presented in the X.509 format and issued by a
Certificate Authority (CA) as a guarantee that a key pair (as
identified by the public key embedded in the certificate) is valid for a
particular subject (user or host).
◉ directly connected routes. Answer: Entry in the routing table
representing a subnet in which the router has an active interface.
◉ disassociation. Answer: Management frame handling process by
which a station is disconnected from an access point.
◉ disaster recovery plan (DRP). Answer: Documented and
resourced plan showing actions and responsibilities to be used in
response to critical incidents.
◉ discretionary access control (DAC). Answer: An access control
model where each resource is protected by an access control list
(ACL) managed by the resource's owner (or owners).
,◉ distance vector. Answer: Algorithm used by routing protocols that
selects a forwarding path based on the next hop router with the
lowest hop count to the destination network.
◉ distributed dos (DDoS). Answer: Attack that involves the use of
infected Internet-connected computers and devices to disrupt the
normal flow of traffic of a server or service by overwhelming the
target with traffic.
◉ distribution or aggregation layer. Answer: Intermediate tier in a
hierarchical network topology providing interconnections between
the access layer and the core.
◉ distribution system (DS). Answer: A system that connects
multiple access points in a wireless network.
◉ dns caching. Answer: The process of storing DNS query results to
improve response times for subsequent queries.
◉ dns over hypertext transfer protocol secure (DOH). Answer: A
protocol for performing remote DNS resolution via the HTTPS
protocol.
◉ dns over transport layer security (DOT). Answer: A protocol for
performing DNS queries over a secure TLS connection.
, ◉ dns poisoning. Answer: A type of attack that involves corrupting
the DNS cache to redirect traffic to malicious sites.
◉ domain name system (DNS). Answer: A hierarchical system for
naming resources on the internet, translating human-readable
domain names to IP addresses.
◉ domain name system security extensions (DNSSEC). Answer: A
suite of extensions that add security to the DNS protocol by enabling
DNS responses to be verified for authenticity.
◉ dotted decimal notation. Answer: A method of representing an IP
address in a human-readable format using four decimal numbers
separated by dots.
◉ dual stack. Answer: A network configuration that allows for both
IPv4 and IPv6 to coexist.
◉ dumpster diving. Answer: The practice of searching through trash
to find sensitive information.
◉ dynamic host configuration protocol (DHCP). Answer: A network
management protocol used to automate the process of configuring
devices on IP networks.
QUESTIONS AND SOLUTIONS VERIFIED A+
◉ denial of service (DoS). Answer: Any type of physical, application,
or network attack that affects the availability of a managed resource.
◉ dense wavelength division multiplexing (DWDM). Answer:
Technology for multiplexing 40 or 80 signal channels on a single
fiber using different wavelengths.
◉ dhcp relay. Answer: Configuration of a router to forward DHCP
traffic where the client and server are in different subnets.
◉ dictionary. Answer: Type of password attack that compares
encrypted passwords against a predetermined list of possible
password values.
◉ differentiated services (DiffServ). Answer: Header field used to
indicate a priority value for a layer 3 (IP) packet to facilitate quality
of service (QoS) or class of service (COS) scheduling.
,◉ dig command. Answer: Utility to query a DNS and return
information about a particular domain name.
◉ digital certificate. Answer: Identification and authentication
information presented in the X.509 format and issued by a
Certificate Authority (CA) as a guarantee that a key pair (as
identified by the public key embedded in the certificate) is valid for a
particular subject (user or host).
◉ directly connected routes. Answer: Entry in the routing table
representing a subnet in which the router has an active interface.
◉ disassociation. Answer: Management frame handling process by
which a station is disconnected from an access point.
◉ disaster recovery plan (DRP). Answer: Documented and
resourced plan showing actions and responsibilities to be used in
response to critical incidents.
◉ discretionary access control (DAC). Answer: An access control
model where each resource is protected by an access control list
(ACL) managed by the resource's owner (or owners).
,◉ distance vector. Answer: Algorithm used by routing protocols that
selects a forwarding path based on the next hop router with the
lowest hop count to the destination network.
◉ distributed dos (DDoS). Answer: Attack that involves the use of
infected Internet-connected computers and devices to disrupt the
normal flow of traffic of a server or service by overwhelming the
target with traffic.
◉ distribution or aggregation layer. Answer: Intermediate tier in a
hierarchical network topology providing interconnections between
the access layer and the core.
◉ distribution system (DS). Answer: A system that connects
multiple access points in a wireless network.
◉ dns caching. Answer: The process of storing DNS query results to
improve response times for subsequent queries.
◉ dns over hypertext transfer protocol secure (DOH). Answer: A
protocol for performing remote DNS resolution via the HTTPS
protocol.
◉ dns over transport layer security (DOT). Answer: A protocol for
performing DNS queries over a secure TLS connection.
, ◉ dns poisoning. Answer: A type of attack that involves corrupting
the DNS cache to redirect traffic to malicious sites.
◉ domain name system (DNS). Answer: A hierarchical system for
naming resources on the internet, translating human-readable
domain names to IP addresses.
◉ domain name system security extensions (DNSSEC). Answer: A
suite of extensions that add security to the DNS protocol by enabling
DNS responses to be verified for authenticity.
◉ dotted decimal notation. Answer: A method of representing an IP
address in a human-readable format using four decimal numbers
separated by dots.
◉ dual stack. Answer: A network configuration that allows for both
IPv4 and IPv6 to coexist.
◉ dumpster diving. Answer: The practice of searching through trash
to find sensitive information.
◉ dynamic host configuration protocol (DHCP). Answer: A network
management protocol used to automate the process of configuring
devices on IP networks.
