CREST CPSA QUIZZES Actual Exam / 2025-
2026 Newest Version / Well-Detailed Questions
& Verified Answers / Get it 100% Correct
Answers / Rated A+
Name all OSI layers
Answer:
Application, Presentation, Session, Transport, Network,
Data Link, Physical.
Name all TCP/IP layers
Answer:
Application, Transport, internet, Network Access.
Name Four TCP head flags
Answer:
ACK, FIN, SYN, URG, PSH, RST
Which layer does HTTP protocl reside in the OSI model.
Answer:
Layer 7, Application.
Which layer does Ethernet reside in the OSI model.
Answer:
Layer 2, Data link.
Which Layer does IPv4 & IPv6 reside in TCP/IP model.
Answer:
Layer 4, transport.
RFC 1918 addresses
Answer:
,10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
Name the well know, registered and dynamic port ranges.
Answer:
Well Known(0-1023), Registed(1024-49,151) &
Dynamic(49,152-65,535)
What is an ephemeral port?
Answer:
An ephemeral port is a short-lived transport protocol port
for Internet Protocol (IP) communications. Can be used by
both TCP & UDP.
What does IANA stand for?
Answer:
Internet Assigned Numbers Authority
Name 10 common ports and there protocols.
Answer:
FTP21, SSH22, DHCP67(C), DHCP68(S), NTP123,
MYSQL3306, RDP3389, HTTP80, HTTPS443, SMB445,
KERBEROS88, CHARGEN19(UDP), DNS53, TACAS49,
WHOIS43, MSSQL1433, HIDDEN MSSQL2433.
Name five network types.
Answer:
LAN, WAN, MAN, VLAN, WLAN, PAN.
Name five network topologies
Answer:
Mesh, Ring, star, Tree, Bus.
Name five common ethernet and FDDI cable types.
Answer:
100Base5, 10Base2, 10BaseT, 100Base-FL, 1000Base-T.
,What is WIFI the alias for?
Answer:
IEEE 802.11
What does VLAN stand for?
Answer:
Virtual Local Area Network
How does VLAN work?
Answer:
Virtual Local Area Networks (VLANs) separate an existing
physical network into multiple logical networks.
Thus, each VLAN creates its own broadcast domain.
Communication between two VLANs can only occur
through a router that is connected to both.
Name five common ICMP types.
Answer:
8-echo, 0-echo reply, 30-trace route, 5-redirect, 3-
destination unreachable, 11, time execeed.
What does ICMP stand for?
Answer:
Internet Control Message Protocol
What does TTL stand for?
Answer:
Time to Live
What is TTL?
Answer:
TTL is a hop count system, and each router decreases the
TTL by 1. Upon reaching 0, the packet is dropped. This way
you don't have packets not reaching their destination and
clogging the network.
, OS TLL numbers?
Answer:
128 Windows, 64 linux, 255 solaris(kapp)
What is Traceroute
Answer:
Traceroute is when you send a packet with a TTL value of 1
once it reaches the first router it will die sending a ICMP
message to sender, at which point the sender can send
another one with a value of 2 to see how far it will go. By
doing this we can see how many hops it will take to reach
our target. (A good way of enumeration of a network, when
in a black box pen-test.)
What is ping sweep?
Answer:
Ping sweep is just a technique that can be used to find out
which hosts are alive in a network or large number of IP
addresses.
Name Five Namp Flags.
Answer:
(TCP SYN scan, -sS)
(Null Scan, -sN)
(Ping Scan, -sP)
(Ack Scan, -sA)
(OS dect, -O)
What are the three firewall states?
Answer:
Open, Filtered Dropped Blocked, Closed not listening.
What is TCP window size?
Answer:
Window size a method of controlling the flow of packets
between two computers or network hosts. Decieded in the
tcp three way handshake.
2026 Newest Version / Well-Detailed Questions
& Verified Answers / Get it 100% Correct
Answers / Rated A+
Name all OSI layers
Answer:
Application, Presentation, Session, Transport, Network,
Data Link, Physical.
Name all TCP/IP layers
Answer:
Application, Transport, internet, Network Access.
Name Four TCP head flags
Answer:
ACK, FIN, SYN, URG, PSH, RST
Which layer does HTTP protocl reside in the OSI model.
Answer:
Layer 7, Application.
Which layer does Ethernet reside in the OSI model.
Answer:
Layer 2, Data link.
Which Layer does IPv4 & IPv6 reside in TCP/IP model.
Answer:
Layer 4, transport.
RFC 1918 addresses
Answer:
,10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
Name the well know, registered and dynamic port ranges.
Answer:
Well Known(0-1023), Registed(1024-49,151) &
Dynamic(49,152-65,535)
What is an ephemeral port?
Answer:
An ephemeral port is a short-lived transport protocol port
for Internet Protocol (IP) communications. Can be used by
both TCP & UDP.
What does IANA stand for?
Answer:
Internet Assigned Numbers Authority
Name 10 common ports and there protocols.
Answer:
FTP21, SSH22, DHCP67(C), DHCP68(S), NTP123,
MYSQL3306, RDP3389, HTTP80, HTTPS443, SMB445,
KERBEROS88, CHARGEN19(UDP), DNS53, TACAS49,
WHOIS43, MSSQL1433, HIDDEN MSSQL2433.
Name five network types.
Answer:
LAN, WAN, MAN, VLAN, WLAN, PAN.
Name five network topologies
Answer:
Mesh, Ring, star, Tree, Bus.
Name five common ethernet and FDDI cable types.
Answer:
100Base5, 10Base2, 10BaseT, 100Base-FL, 1000Base-T.
,What is WIFI the alias for?
Answer:
IEEE 802.11
What does VLAN stand for?
Answer:
Virtual Local Area Network
How does VLAN work?
Answer:
Virtual Local Area Networks (VLANs) separate an existing
physical network into multiple logical networks.
Thus, each VLAN creates its own broadcast domain.
Communication between two VLANs can only occur
through a router that is connected to both.
Name five common ICMP types.
Answer:
8-echo, 0-echo reply, 30-trace route, 5-redirect, 3-
destination unreachable, 11, time execeed.
What does ICMP stand for?
Answer:
Internet Control Message Protocol
What does TTL stand for?
Answer:
Time to Live
What is TTL?
Answer:
TTL is a hop count system, and each router decreases the
TTL by 1. Upon reaching 0, the packet is dropped. This way
you don't have packets not reaching their destination and
clogging the network.
, OS TLL numbers?
Answer:
128 Windows, 64 linux, 255 solaris(kapp)
What is Traceroute
Answer:
Traceroute is when you send a packet with a TTL value of 1
once it reaches the first router it will die sending a ICMP
message to sender, at which point the sender can send
another one with a value of 2 to see how far it will go. By
doing this we can see how many hops it will take to reach
our target. (A good way of enumeration of a network, when
in a black box pen-test.)
What is ping sweep?
Answer:
Ping sweep is just a technique that can be used to find out
which hosts are alive in a network or large number of IP
addresses.
Name Five Namp Flags.
Answer:
(TCP SYN scan, -sS)
(Null Scan, -sN)
(Ping Scan, -sP)
(Ack Scan, -sA)
(OS dect, -O)
What are the three firewall states?
Answer:
Open, Filtered Dropped Blocked, Closed not listening.
What is TCP window size?
Answer:
Window size a method of controlling the flow of packets
between two computers or network hosts. Decieded in the
tcp three way handshake.
