CCNA PRACTICE EXAM QUESTIONS | COMPLETE PRACTICE QUESTIONS,
ANSWERS & STUDY GUIDE 2026/2027
True statements about the operation of a full-duplex Ethernet network - ANS ✔✔There are no collisions
in full-duplex mode.
A dedicated switch port is required for each full-duplex node.
The host network card and the switch port must be capable of operating in full-duplex mode.
Which OSI layer header contains the address of a destination host that is on another network? - ANS
✔✔Network Layer
Which layer of the TCP/IP stack combines the OSI model physical and data link layers? - ANS ✔✔Network
access layer
Which protocol uses a connection-oriented service to deliver files between end systems? - ANS ✔✔FTP
What do switches do? - ANS ✔✔Prevent Ethernet Collisions, Create less collision domains.
Mac Address - ANS ✔✔Physical Address, Layer 2 devices,
Which network device functions only at Layer 1 of the OSI model? - ANS ✔✔Hub
Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt
required? - ANS ✔✔UDP
Which layer of the OSI model controls the reliability of communications between network devices using
flow control, sequencing and acknowledgments? - ANS ✔✔Transport Layer
True statements regarding ICMP packets - ANS ✔✔TRACERT uses ICMP packets.
They are encapsulated within IP datagrams
Statements that accurately describe CDP - ANS ✔✔CDP is a Cisco proprietary protocol.
CDP is a datalink layer protocol.
CDP can discover directly connected neighboring Cisco devices.
How does a switch differ from a hub? - ANS ✔✔A switch tracks MAC addresses of directly-connected
devices.
What must occur before a workstation can exchange HTTP packets with a web server? - ANS ✔✔A TCP
connection must be established between the workstation and the web server.
How does TCP differ from UDP? - ANS ✔✔TCP provides sequence numbering of packets.
TCP provides synchronized communication.
ANSWERS & STUDY GUIDE 2026/2027
True statements about the operation of a full-duplex Ethernet network - ANS ✔✔There are no collisions
in full-duplex mode.
A dedicated switch port is required for each full-duplex node.
The host network card and the switch port must be capable of operating in full-duplex mode.
Which OSI layer header contains the address of a destination host that is on another network? - ANS
✔✔Network Layer
Which layer of the TCP/IP stack combines the OSI model physical and data link layers? - ANS ✔✔Network
access layer
Which protocol uses a connection-oriented service to deliver files between end systems? - ANS ✔✔FTP
What do switches do? - ANS ✔✔Prevent Ethernet Collisions, Create less collision domains.
Mac Address - ANS ✔✔Physical Address, Layer 2 devices,
Which network device functions only at Layer 1 of the OSI model? - ANS ✔✔Hub
Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt
required? - ANS ✔✔UDP
Which layer of the OSI model controls the reliability of communications between network devices using
flow control, sequencing and acknowledgments? - ANS ✔✔Transport Layer
True statements regarding ICMP packets - ANS ✔✔TRACERT uses ICMP packets.
They are encapsulated within IP datagrams
Statements that accurately describe CDP - ANS ✔✔CDP is a Cisco proprietary protocol.
CDP is a datalink layer protocol.
CDP can discover directly connected neighboring Cisco devices.
How does a switch differ from a hub? - ANS ✔✔A switch tracks MAC addresses of directly-connected
devices.
What must occur before a workstation can exchange HTTP packets with a web server? - ANS ✔✔A TCP
connection must be established between the workstation and the web server.
How does TCP differ from UDP? - ANS ✔✔TCP provides sequence numbering of packets.
TCP provides synchronized communication.
