Introduction to Cisco Networking Technologies: 640-821 Exam


"Introduction to Cisco Networking Technologies", also known as 640-821 exam, is a Cisco Certification. With the complete collection of questions and answers, Pass4sureCert has assembled to take you through 91 Q&As to your 640-821 Exam preparation. In the 640-821 exam resources, you will cover every field and category in CCNA Certification helping to ready you for your successful Cisco Certification.

  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Total Questions: 91
  • Certification Provider: Cisco
  • Corresponding Certification: CCNA
  • Updated on: Jun 02, 2026

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Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. What is the purpose of using the copy flash tftp command on a router?

A) to backup the router configuration to a server
B) to copy an IOS image to the router
C) to move the IOS image from a server to the router
D) to create a backup copy of the IOS


2. What two commands can be used to view the amount of memory that is used to hold the router IOS? (Choose two.)

A) Router# show version
B) Router# show flash
C) Router# show running-config
D) Router# show flash memory
E) Router# show memory


3. Refer to the exhibit. If host A sends an IP packet to host B, what will the source physical address be in the frame when it reaches host B?

A) A1:A1:A1:A1:A1:A1
B) 10.168.11.88
C) 10.168.10.99
D) B2:B2:B2:B2:B2:B2
E) D4:D4:D4:D4:D4:D4
F) C3:C3:C3:C3:C3:C3


4. DRAG DROP
drag drop


5. Refer to the topology and MAC address table shown in the exhibit. Host A sends a data frame to host D.
What will the switch do when it receives the frame from host A?

A) The switch will flood the frame out of all ports except for port Fa0/3.
B) The switch will add the destination address of the frame to the MAC address table and forward the frame to host
C) The switch will discard the frame and send an error message back to host A.
D) The switch will add the source address and port to the MAC address table and forward the frame to host D.


Solutions:

Question # 1
Answer: D
Question # 2
Answer: A,B
Question # 3
Answer: F
Question # 4
Answer: Only visible for members
Question # 5
Answer: D

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