CCNA 1 NETWORKING FUNDAMENTALS | COMPLETE PRACTICE QUESTIONS,
ANSWERS & STUDY GUIDE 2026/2027
What type of data does the Transport Layer send? - correct answer ✔✔Segment
What type of data does the Network Layer send? - correct answer ✔✔Packet
What type of data does the Link Layer send? - correct answer ✔✔Frame
What are the 4 layers of the TCP/IP model? And the alternate 5 layers? - correct answer ✔✔4:
Application, Transport, Internet, Link
5: Application, Transport, Network, Data Link, Physical
Briefly describe the process of encapsulation from Application to Network layer and their purpose. -
correct answer ✔✔1. Create and encapsulate data with any Application header+trailer required (ex.
HTTP).
2. Encapsulate that data with Transport Layer header (ex. TCP/UDP).
3. Encapsulate that data with Network Layer header (ex. IP).
4. Transmit data.
The bits that include the headers+trailer and encapsulated data is called: - correct answer ✔✔PDU
(Protocol Data Unit)
HTTP, POP3, and SMTP are examples of protocols for which layer? - correct answer ✔✔Application Layer
Ethernet, PPP, T1 are examples of protocols for which layer? - correct answer ✔✔Data Link Layer
Which OSI layer defines the functions of logical network-wide addressing and routing? - correct answer
✔✔Layer 3 (Network Layer)
What are some examples of devices that work at the Physical layer? - correct answer ✔✔Hubs,
Repeaters, Cables
Switches, wireless access points, and cable modems work at which layer? - correct answer ✔✔Layer 2
(Data Link)
Routers work at which layer? - correct answer ✔✔Layer 3 (Network)
THINK >>addressing<<
Only devices that use cabling are considered Ethernet? (T/F) - correct answer ✔✔True
For a crossover cable which pins connect to which? - correct answer ✔✔Pins 1 and 2 connect to pins 3
and 6.
Which pins does a PC transmit on? - correct answer ✔✔Pins 1 and 2.
ANSWERS & STUDY GUIDE 2026/2027
What type of data does the Transport Layer send? - correct answer ✔✔Segment
What type of data does the Network Layer send? - correct answer ✔✔Packet
What type of data does the Link Layer send? - correct answer ✔✔Frame
What are the 4 layers of the TCP/IP model? And the alternate 5 layers? - correct answer ✔✔4:
Application, Transport, Internet, Link
5: Application, Transport, Network, Data Link, Physical
Briefly describe the process of encapsulation from Application to Network layer and their purpose. -
correct answer ✔✔1. Create and encapsulate data with any Application header+trailer required (ex.
HTTP).
2. Encapsulate that data with Transport Layer header (ex. TCP/UDP).
3. Encapsulate that data with Network Layer header (ex. IP).
4. Transmit data.
The bits that include the headers+trailer and encapsulated data is called: - correct answer ✔✔PDU
(Protocol Data Unit)
HTTP, POP3, and SMTP are examples of protocols for which layer? - correct answer ✔✔Application Layer
Ethernet, PPP, T1 are examples of protocols for which layer? - correct answer ✔✔Data Link Layer
Which OSI layer defines the functions of logical network-wide addressing and routing? - correct answer
✔✔Layer 3 (Network Layer)
What are some examples of devices that work at the Physical layer? - correct answer ✔✔Hubs,
Repeaters, Cables
Switches, wireless access points, and cable modems work at which layer? - correct answer ✔✔Layer 2
(Data Link)
Routers work at which layer? - correct answer ✔✔Layer 3 (Network)
THINK >>addressing<<
Only devices that use cabling are considered Ethernet? (T/F) - correct answer ✔✔True
For a crossover cable which pins connect to which? - correct answer ✔✔Pins 1 and 2 connect to pins 3
and 6.
Which pins does a PC transmit on? - correct answer ✔✔Pins 1 and 2.
