CREST CPSA EXAM 300 QUESTIONS AND
CORRECT ANSWERS LATEST
20242025(VERIFIED ANSWERS)
What does IANA stand for? Internet Assigned Numbers Authority
Name all OSI layers Application, Presentation, Session, Transport, Network, Data
Link, Physical.
Name all TCP/IP layers Application, Transport, internet, Network Access.
Name Four TCP head flags ACK, FIN, SYN, URG, PSH, RST
Which layer does HTTP Layer 7, Application.
protocl reside in the OSI
model.
Which layer does Ethernet Layer 2, Data link.
reside in the OSI model.
Which Layer does IPv4 & Layer 4, transport.
IPv6 reside in TCP/IP model.
RFC 1918 addresses 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, Well Known(0-1023), Registed(1024-49,151) &
registered and dynamic port Dynamic(49,152-65,535)
ranges.
An ephemeral port is a short-lived transport protocol port
What is an ephemeral port? for Internet Protocol (IP) communications. Can be used by
both TCP & UDP.
, Name 10 common ports and FTP21, SSH22, DHCP67(C), DHCP68(S), NTP123,
there protocols. MYSQL3306, RDP3389, HTTP80, HTTPS443, SMB445,
KERBEROS88, CHARGEN19(UDP), DNS53, TACAS49, WHOIS43,
MSSQL1433, HIDDEN MSSQL2433.
Name five network types. LAN, WAN, MAN, VLAN, WLAN, PAN.
Name five network Mesh, Ring, star, Tree, Bus.
topologies
Name five common 100Base5, 10Base2, 10BaseT, 100Base-FL, 1000Base-T.
ethernet and FDDI cable
types.
What is WIFI the alias for? IEEE 802.11
What does VLAN stand for? Virtual Local Area Network
How does VLAN work? 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 8-echo, 0-echo reply, 30-trace route, 5-redirect, 3destination
types. unreachable, 11, time execeed.
What does ICMP stand for? Internet Control Message Protocol
What does TTL stand for? Time to Live
What is TTL? 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.
CORRECT ANSWERS LATEST
20242025(VERIFIED ANSWERS)
What does IANA stand for? Internet Assigned Numbers Authority
Name all OSI layers Application, Presentation, Session, Transport, Network, Data
Link, Physical.
Name all TCP/IP layers Application, Transport, internet, Network Access.
Name Four TCP head flags ACK, FIN, SYN, URG, PSH, RST
Which layer does HTTP Layer 7, Application.
protocl reside in the OSI
model.
Which layer does Ethernet Layer 2, Data link.
reside in the OSI model.
Which Layer does IPv4 & Layer 4, transport.
IPv6 reside in TCP/IP model.
RFC 1918 addresses 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, Well Known(0-1023), Registed(1024-49,151) &
registered and dynamic port Dynamic(49,152-65,535)
ranges.
An ephemeral port is a short-lived transport protocol port
What is an ephemeral port? for Internet Protocol (IP) communications. Can be used by
both TCP & UDP.
, Name 10 common ports and FTP21, SSH22, DHCP67(C), DHCP68(S), NTP123,
there protocols. MYSQL3306, RDP3389, HTTP80, HTTPS443, SMB445,
KERBEROS88, CHARGEN19(UDP), DNS53, TACAS49, WHOIS43,
MSSQL1433, HIDDEN MSSQL2433.
Name five network types. LAN, WAN, MAN, VLAN, WLAN, PAN.
Name five network Mesh, Ring, star, Tree, Bus.
topologies
Name five common 100Base5, 10Base2, 10BaseT, 100Base-FL, 1000Base-T.
ethernet and FDDI cable
types.
What is WIFI the alias for? IEEE 802.11
What does VLAN stand for? Virtual Local Area Network
How does VLAN work? 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 8-echo, 0-echo reply, 30-trace route, 5-redirect, 3destination
types. unreachable, 11, time execeed.
What does ICMP stand for? Internet Control Message Protocol
What does TTL stand for? Time to Live
What is TTL? 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.
