Cisco 640-821 Valid Q&A - in .pdf

  • 640-821 pdf
  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Updated: Sep 02, 2025
  • Q & A: 91 Questions and Answers
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  • Exam Name: Introduction to Cisco Networking Technologies
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Cisco 640-821 Valid Q&A - Testing Engine

  • 640-821 Testing Engine
  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Updated: Sep 02, 2025
  • Q & A: 91 Questions and Answers
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Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. What is the subnet address of 172.16.159.159/22?

A) 172.16.0.0
B) 172.16.156.0
C) 172.16.128.0
D) 172.16.159.0
E) 172.16.159.128
F) 172.16.192.0


2. Which OSI layer header contains the address of a destination host that is on another network?

A) application
B) network
C) physical
D) transport
E) session
F) data link


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

A) After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.
B) After a collision, the station that detected the collision has first priority to resend the lost data.
C) In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
D) 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.
E) The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.
F) In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.


4. Refer to the graphic. A network associate is planning to copy a new IOS image into the
Paden router. This new image requires 8 MB of flash memory and 32 MB of RAM. How will the IOS proceed with the copy process?

A) The current IOS image must be manually erased before IOS will allow the new image to be copied.
B) The new IOS will be copied into flash memory and the current image will remain.
C) IOS will issue an error message because flash memory is not large enough to hold the new image.
D) During the copy process, the current IOS image will be erased.


5. Which IOS user EXEC command will allow a network technician to determine which router in the path to an unreachable network host should be examined more closely for the cause of the network failure?

A) Router> show cdp neighbors
B) Router> show interface
C) Router> ping
D) Router> trace
E) Router> show ip route
F) Router> telnet


Solutions:

Question # 1
Answer: B
Question # 2
Answer: B
Question # 3
Answer: D,F
Question # 4
Answer: B
Question # 5
Answer: D

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