CCNA 1 | COMPLETE PRACTICE QUESTIONS, ANSWERS & STUDY GUIDE
2026/2027
The network administrator enters these commands into the R1 router:
R1# copy running-config tftp
Address or name of remote host [ ]?
When the router prompts for an address or remote host name, what IP address should the administrator
enter at the prompt? - correct answer ✔✔192.168.11.252
Which three statements characterize the transport layer protocols? - correct answer ✔✔TCP and UDP
port numbers are used by application layer protocols.
TCP uses windowing and sequencing to provide reliable transfer of data.
TCP is a connection-oriented protocol. UDP is a connectionless protocol.
What is the purpose of ICMP messages? - correct answer ✔✔to provide feedback of IP packet
transmissions
A technician uses the ping 127.0.0.1 command. What is the technician testing? - correct answer ✔✔the
TCP/IP stack on a network host
What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC
table? - correct answer ✔✔It forwards the frame out of all ports except for the port at which the frame
was received.
What is a characteristic of the LLC sublayer? - correct answer ✔✔It places information in the frame that
allows multiple Layer 3 protocols to use the same network interface and media.
On which switch interface would an administrator configure an IP address so that the switch can be
managed remotely? - correct answer ✔✔VLAN 1
A network engineer is measuring the transfer of bits across the company backbone for a mission critical
database application. The engineer notices that the network throughput appears lower than the
bandwidth expected. Which three factors could influence the differences in throughput? - correct
answer ✔✔the amount of traffic that is currently crossing the network
the type of traffic that is crossing the network
the latency that is created by the number of network devices that the data is crossing
When applied to a router, which command would help mitigate brute-force password attacks against the
router? - correct answer ✔✔login block-for 60 attempts 5 within 60
Which two statements correctly describe a router memory type and its contents? - correct answer
✔✔ROM is nonvolatile and contains basic diagnostic software.
RAM is volatile and stores the IP routing table.
, Which two components are necessary for a wireless client to be installed on a WLAN? - correct answer
✔✔wireless NIC
wireless client software
packet tracer activity - correct answer ✔✔winner
A host is accessing a Web server on a remote network. Which three functions are performed by
intermediary network devices during this conversation? - correct answer ✔✔regenerating data signals
notifying other devices when errors occur
applying security settings to control the flow of data
Match the situation with the appropriate use of network media:
desktop PCs in an enterprise office & Horizontal cabling structure - correct answer ✔✔Copper Cables
Match the situation with the appropriate use of network media:
backbone cabling in an enterprise & long-haul networks - correct answer ✔✔Fiber Optic
Match the situation with the appropriate use of network media:
waiting rooms in a hospital & guest access in a coffee shop - correct answer ✔✔Wireless
What is the correct order for PDU encapsulation? - correct answer ✔✔Frame Header | Network Header
| Transport Header | Data | Frame Trailer
Which address on a PC does not change, even if the PC is moved to a different network? - correct answer
✔✔MAC address
What will happen if the default gateway address is incorrectly configured on a host? - correct answer
✔✔The host cannot communicate with hosts in other networks.
A host PC has just booted and is attempting to lease an address through DHCP. Which two messages will
the client typically broadcast on the network? - correct answer ✔✔DHCPREQUEST
DHCPDISCOVER
Refer to the exhibit. An administrator wants to change the name of a brand new switch, using the
hostname command as shown. What prompt will display after the command is issued?
Switch (config) #hostname My Switch - correct answer ✔✔Switch(config)#
After making configuration changes, a network administrator issues a copy running-config startup-config
command in a Cisco switch. What is the result of issuing this command? - correct answer ✔✔The new
configuration will be loaded if the switch is restarted.
Refer to the exhibit.A TCP segment from a server has been captured by Wireshark, which is running on a
host. What acknowledgement number will the host return for the TCP segment that has been received?
[Next sequence number 306] - correct answer ✔✔306
2026/2027
The network administrator enters these commands into the R1 router:
R1# copy running-config tftp
Address or name of remote host [ ]?
When the router prompts for an address or remote host name, what IP address should the administrator
enter at the prompt? - correct answer ✔✔192.168.11.252
Which three statements characterize the transport layer protocols? - correct answer ✔✔TCP and UDP
port numbers are used by application layer protocols.
TCP uses windowing and sequencing to provide reliable transfer of data.
TCP is a connection-oriented protocol. UDP is a connectionless protocol.
What is the purpose of ICMP messages? - correct answer ✔✔to provide feedback of IP packet
transmissions
A technician uses the ping 127.0.0.1 command. What is the technician testing? - correct answer ✔✔the
TCP/IP stack on a network host
What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC
table? - correct answer ✔✔It forwards the frame out of all ports except for the port at which the frame
was received.
What is a characteristic of the LLC sublayer? - correct answer ✔✔It places information in the frame that
allows multiple Layer 3 protocols to use the same network interface and media.
On which switch interface would an administrator configure an IP address so that the switch can be
managed remotely? - correct answer ✔✔VLAN 1
A network engineer is measuring the transfer of bits across the company backbone for a mission critical
database application. The engineer notices that the network throughput appears lower than the
bandwidth expected. Which three factors could influence the differences in throughput? - correct
answer ✔✔the amount of traffic that is currently crossing the network
the type of traffic that is crossing the network
the latency that is created by the number of network devices that the data is crossing
When applied to a router, which command would help mitigate brute-force password attacks against the
router? - correct answer ✔✔login block-for 60 attempts 5 within 60
Which two statements correctly describe a router memory type and its contents? - correct answer
✔✔ROM is nonvolatile and contains basic diagnostic software.
RAM is volatile and stores the IP routing table.
, Which two components are necessary for a wireless client to be installed on a WLAN? - correct answer
✔✔wireless NIC
wireless client software
packet tracer activity - correct answer ✔✔winner
A host is accessing a Web server on a remote network. Which three functions are performed by
intermediary network devices during this conversation? - correct answer ✔✔regenerating data signals
notifying other devices when errors occur
applying security settings to control the flow of data
Match the situation with the appropriate use of network media:
desktop PCs in an enterprise office & Horizontal cabling structure - correct answer ✔✔Copper Cables
Match the situation with the appropriate use of network media:
backbone cabling in an enterprise & long-haul networks - correct answer ✔✔Fiber Optic
Match the situation with the appropriate use of network media:
waiting rooms in a hospital & guest access in a coffee shop - correct answer ✔✔Wireless
What is the correct order for PDU encapsulation? - correct answer ✔✔Frame Header | Network Header
| Transport Header | Data | Frame Trailer
Which address on a PC does not change, even if the PC is moved to a different network? - correct answer
✔✔MAC address
What will happen if the default gateway address is incorrectly configured on a host? - correct answer
✔✔The host cannot communicate with hosts in other networks.
A host PC has just booted and is attempting to lease an address through DHCP. Which two messages will
the client typically broadcast on the network? - correct answer ✔✔DHCPREQUEST
DHCPDISCOVER
Refer to the exhibit. An administrator wants to change the name of a brand new switch, using the
hostname command as shown. What prompt will display after the command is issued?
Switch (config) #hostname My Switch - correct answer ✔✔Switch(config)#
After making configuration changes, a network administrator issues a copy running-config startup-config
command in a Cisco switch. What is the result of issuing this command? - correct answer ✔✔The new
configuration will be loaded if the switch is restarted.
Refer to the exhibit.A TCP segment from a server has been captured by Wireshark, which is running on a
host. What acknowledgement number will the host return for the TCP segment that has been received?
[Next sequence number 306] - correct answer ✔✔306
