COMPTIA Network+ N10-009 Exam
2025/2026 Exam Questions with 100%
Correct Answers | Latest Update
What does the OSI model stand for and what are the seven layers? -
🧠ANSWER ✔✔Open Systems Interconnection Reference Model
Layer 7 = Application
Layer 6 = Presentation
Layer 5 = Session
Layer 4 = Transport
Layer 3 = Network
Layer 2 = Data Link
Layer 1 = Physical
,Describe layer 1 of the OSI model - 🧠ANSWER ✔✔Physical layer --
signaling, cabling, connections
No protocols
Examples of layer 1 issues and solutions - 🧠ANSWER ✔✔Fix cabling,
punch-downs, etc.
Run loopback tests, test/replace cables, swap adapter cards
Loopback test - 🧠ANSWER ✔✔A diagnostic procedure that verifies the
integrity of a communication pathway by sending a signal from a device
and returning it to the same device
Describe layer 2 of the OSI model - 🧠ANSWER ✔✔Data Link layer, the
basic network "language", the foundation of communication
* MAC address on Ethernet
The "switching" layer
Describe layer 3 of the OSI model - 🧠ANSWER ✔✔Network layer, the
"routing layer"
* Internet Protocol (IP)
* Fragments frames to traverse different networks
,Describe layer 4 of the OSI model - 🧠ANSWER ✔✔Transport layer, the
"post office" layer, parcels and lettings from one side of the network to the
other
* TCP & UDP
Describe layer 5 of the OSI model - 🧠ANSWER ✔✔Session layer,
communication between devices (start, stop, restart)
* Control protocols, tunneling protocols
Describe layer 6 of the OSI model - 🧠ANSWER ✔✔Presentation layer
* Character encoding
* Application encryption
* Often combined with layer 7, the application layer
Describe layer 7 of the OSI model - 🧠ANSWER ✔✔Application layer, the
layer we see
* HTTP, FTP, DNS, POP3
OSI model mapped to real-world - 🧠ANSWER ✔✔Layer 7 = Your eyes
Layer 6 = Application encryption (SSL/TLS)
3
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STATEMENT. ALL RIGHTS RESERVED
, Layer 5 = Control protocols, tunneling protocols
Layer 4 = TCP segment, UDP datagram
Layer 3 = IP Address, Router, Packet
Layer 2 = Frame, MAC address, Extended Unique Identifier (EUI-48, EUI-
64), Switch
Layer 1 = Cables, fiber, and the signal itself
Real-world example of the OSI model - 🧠ANSWER ✔✔Application:
https://mail.google.com
Presentation: SSL encryption
Session: Link the presentation to the transport
Transport: TCP encapsulation
Network: IP encapsulation
Data Link: Ethernet
Physical: Electrical signals
Router - 🧠ANSWER ✔✔- Routes traffic between IP subnets
- OSI layer 3 devices
2025/2026 Exam Questions with 100%
Correct Answers | Latest Update
What does the OSI model stand for and what are the seven layers? -
🧠ANSWER ✔✔Open Systems Interconnection Reference Model
Layer 7 = Application
Layer 6 = Presentation
Layer 5 = Session
Layer 4 = Transport
Layer 3 = Network
Layer 2 = Data Link
Layer 1 = Physical
,Describe layer 1 of the OSI model - 🧠ANSWER ✔✔Physical layer --
signaling, cabling, connections
No protocols
Examples of layer 1 issues and solutions - 🧠ANSWER ✔✔Fix cabling,
punch-downs, etc.
Run loopback tests, test/replace cables, swap adapter cards
Loopback test - 🧠ANSWER ✔✔A diagnostic procedure that verifies the
integrity of a communication pathway by sending a signal from a device
and returning it to the same device
Describe layer 2 of the OSI model - 🧠ANSWER ✔✔Data Link layer, the
basic network "language", the foundation of communication
* MAC address on Ethernet
The "switching" layer
Describe layer 3 of the OSI model - 🧠ANSWER ✔✔Network layer, the
"routing layer"
* Internet Protocol (IP)
* Fragments frames to traverse different networks
,Describe layer 4 of the OSI model - 🧠ANSWER ✔✔Transport layer, the
"post office" layer, parcels and lettings from one side of the network to the
other
* TCP & UDP
Describe layer 5 of the OSI model - 🧠ANSWER ✔✔Session layer,
communication between devices (start, stop, restart)
* Control protocols, tunneling protocols
Describe layer 6 of the OSI model - 🧠ANSWER ✔✔Presentation layer
* Character encoding
* Application encryption
* Often combined with layer 7, the application layer
Describe layer 7 of the OSI model - 🧠ANSWER ✔✔Application layer, the
layer we see
* HTTP, FTP, DNS, POP3
OSI model mapped to real-world - 🧠ANSWER ✔✔Layer 7 = Your eyes
Layer 6 = Application encryption (SSL/TLS)
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, Layer 5 = Control protocols, tunneling protocols
Layer 4 = TCP segment, UDP datagram
Layer 3 = IP Address, Router, Packet
Layer 2 = Frame, MAC address, Extended Unique Identifier (EUI-48, EUI-
64), Switch
Layer 1 = Cables, fiber, and the signal itself
Real-world example of the OSI model - 🧠ANSWER ✔✔Application:
https://mail.google.com
Presentation: SSL encryption
Session: Link the presentation to the transport
Transport: TCP encapsulation
Network: IP encapsulation
Data Link: Ethernet
Physical: Electrical signals
Router - 🧠ANSWER ✔✔- Routes traffic between IP subnets
- OSI layer 3 devices
