Free 640-821 Questions for Cisco Introduction to Cisco Networking Technologies 640-821 Exam as PDF & Practice Test Engine

Exam Code/Number: 640-821
Exam Name/Title: Introduction to Cisco Networking Technologies
Certification Provider: Cisco
Corresponding Certification: CCNA

Exam Questions: 91
Updated On: Jul 25, 2026

Question #1

A network administrator is connecting PC hosts A and B directly through their Ethernet interfaces as shown in the graphic. Ping attempts between the hosts are unsuccessful.
What can be done to provide connectivity between the hosts? (Choose two.)

A. The subnet masks should be set to 255.255.255.192.

B. The subnet masks should be set to 255.255.255.0.

C. A rollover cable should be used in place of the straight-through cable

D. The hosts must be reconfigured to use private IP addresses for direct connections of this type.

E. A crossover cable should be used in place of the straight-through cable.

F. A default gateway needs to be set on each host.

Discussion 0

Correct Answer: B,E Vote an answer

Question #2

Which of the following commands enables a network administrator to verify the application layer connectivity between source and destination?

A. verify

B. telnet

C. traceroute

D. trace

E. ping

Discussion 0

Correct Answer: B Vote an answer

Question #3

Which two statements describe the operation of the CSMA/CD access method? (Choose two.)

A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.

B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.

C. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.

D. After a collision, the station that detected the collision has first priority to resend the lost data.

E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.

F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.

Discussion 0

Correct Answer: B,E Vote an answer

Question #4

How many simultaneous Telnet sessions does a Cisco router support by default?

A. 4

B. 5

C. 6

D. 1

E. 2

F. 3

Discussion 0

Correct Answer: B Vote an answer

Question #5

Refer to the exhibit. SwitchA receives the frame with the addressing shown in the exhibit.
According to the command output also shown in the exhibit, how will SwitchA handle this frame?

A. It will flood the frame out all ports except Fa0/3.

B. It will forward the frame out port Fa0/3 only.

C. It will drop the frame.

D. It will flood the frame out all ports.

E. It will forward the frame out port Fa0/6 only.

Discussion 0

Correct Answer: E Vote an answer

Question #6

Which command will reinitialize the router and totally replace the running configuration with the current startup configuration?

A. router# copy tftp startup-config

B. router# copy startup-config running-config

C. router# copy running-config flash

D. router# reload

E. router# setup

F. router# restart

Discussion 0

Correct Answer: D Vote an answer

Question #7

Refer to the exhibit. SwitchA receives the frame with the addressing shown. According to the command output also shown in the exhibit, how will SwitchA handle this frame?

A. It will flood the frame out all ports except Fa0/3.

B. It will forward the frame out port Fa0/3 only.

C. It will drop the frame.

D. It will flood the frame out all ports.

Discussion 0

Correct Answer: A Vote an answer

Question #8

A router receives a packet on interface 172.16.45.66/26. The source IP of the packet is
172.16.45.126/26 and the destination is 172.16.46.191/26. How will the router handle the packet?

A. The destination is a network address, so the router will forward the packet.

B. The destination is a host on another subnet, so the router will not forward the packet.

C. The destination is a broadcast address, so the router will not forward the packet.

D. The destination is a host on the same subnet, so the router will forward the packet.

Discussion 0

Correct Answer: C Vote an answer

Question #9

DRAG DROP
drag drop

Discussion 0

Correct Answer:

Question #10

DRAG DROP
drag drop

Discussion 0

Correct Answer:

Free 640-821 Questions for Cisco Introduction to Cisco Networking Technologies 640-821 Exam as PDF & Practice Test Engine

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