2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
CERTIPORT NETWORKING
CERTIFICATION QUESTIONS AND
ANSWERS 2024/2025
SMTP (Simple Mail Transfer Protocol)
→ 25 TCP
FTP
→ 20, 21 TCP
HTTPS (Hypertext Transfer Protocol Secure)
→ An encrypted version of HTTP. It uses port 443.
IoT (Internet of Things)
→ a large network of physical objects including sensors and equipment
OSI Layer 1 - Physical
→ Protocols: 100BaseT, 1000BaseT.
→
→ Device: hubs, RJ45, repeater.
OSI Layer 2 - Data Link
→ Protocols: Ethernet, MAC, Frames, crc.
→
→ Device: NIC, switch, bridge, WAPs.
OSI Layer 3 - Network
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,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
→ Logical addressing, switching type, route discovery/selection, and packet ordering.
→ IP, ICMP, ARP, RIP, IPX
→ Device: Router
OSI Layer 4 - Transport
→ Protocols (TCP/UDP), windowing, buffering
→ Device: N/A
OSI Layer 5: Session
→ Protocols: Log on/ Log off, NetBIOS, Negotiation
→
→ Device: N/A.
OSI Layer 6: Presentation
→ Protocols: compression, encryption.
→
→ Device: N/A.
OSI Layer 7: Application
→ Protocols: FTP, HTTP, HTTPS, POP3, SMTP, IMAP
→
→ Device: Gateway
UDP
→ connectionless messaged based protocol with best effort service.
TCP
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, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
→ Transmission Control Protocol, connection oriented protocol with guaranteed service
ARP
→ Address Resolution Protocol, resolves IP addresses to MAC addresses.
Loopback address
→ 127.0.0.0 - 127.255.255.255
Multicast address
→ 224.0.0.0 to 239.255.255.255
Private Network addresses
→ 192.168.0.0 - 192.168.255.255
Class A IP Address
→ 1-126 Leading bits.
→ 128 Networks.
→ 16,777,214 Hosts per Network.
→ Default Subnet Mask 255.0.0.0
Class B IP Address
→ 128-191 Leading bits.
→ 16,384 Networks.
→ 65,534 Hosts per Network.
→ Default Subnet Mask 255.255.0.0
Class C IP Address
1|Page| GradeA+ | 2 0 0 2 5
CERTIPORT NETWORKING
CERTIFICATION QUESTIONS AND
ANSWERS 2024/2025
SMTP (Simple Mail Transfer Protocol)
→ 25 TCP
FTP
→ 20, 21 TCP
HTTPS (Hypertext Transfer Protocol Secure)
→ An encrypted version of HTTP. It uses port 443.
IoT (Internet of Things)
→ a large network of physical objects including sensors and equipment
OSI Layer 1 - Physical
→ Protocols: 100BaseT, 1000BaseT.
→
→ Device: hubs, RJ45, repeater.
OSI Layer 2 - Data Link
→ Protocols: Ethernet, MAC, Frames, crc.
→
→ Device: NIC, switch, bridge, WAPs.
OSI Layer 3 - Network
1|Page| GradeA+ | 2 0 0 2 5
,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
→ Logical addressing, switching type, route discovery/selection, and packet ordering.
→ IP, ICMP, ARP, RIP, IPX
→ Device: Router
OSI Layer 4 - Transport
→ Protocols (TCP/UDP), windowing, buffering
→ Device: N/A
OSI Layer 5: Session
→ Protocols: Log on/ Log off, NetBIOS, Negotiation
→
→ Device: N/A.
OSI Layer 6: Presentation
→ Protocols: compression, encryption.
→
→ Device: N/A.
OSI Layer 7: Application
→ Protocols: FTP, HTTP, HTTPS, POP3, SMTP, IMAP
→
→ Device: Gateway
UDP
→ connectionless messaged based protocol with best effort service.
TCP
1|Page| GradeA+ | 2 0 0 2 5
, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
→ Transmission Control Protocol, connection oriented protocol with guaranteed service
ARP
→ Address Resolution Protocol, resolves IP addresses to MAC addresses.
Loopback address
→ 127.0.0.0 - 127.255.255.255
Multicast address
→ 224.0.0.0 to 239.255.255.255
Private Network addresses
→ 192.168.0.0 - 192.168.255.255
Class A IP Address
→ 1-126 Leading bits.
→ 128 Networks.
→ 16,777,214 Hosts per Network.
→ Default Subnet Mask 255.0.0.0
Class B IP Address
→ 128-191 Leading bits.
→ 16,384 Networks.
→ 65,534 Hosts per Network.
→ Default Subnet Mask 255.255.0.0
Class C IP Address
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