640-821 exam dumps

Cisco 640-821 Value Package

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  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • No. of Questions: 91 Questions and Answers
  • Updated: May 29, 2026

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Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. The internetwork shown in the diagram is experiencing network delays. On the basis of the information provided in the exhibit, what is the problem?

A) The cable connecting Host A to Switch2 is too long.
B) The cable between Switch1 and Switch2 should be straight-through.
C) The cable between Router1 and Switch1 should be a crossover.
D) The server is on a different subnet than router interface Fa0/0.
E) The connection between Switch1 and Switch2 should be half-duplex.


2. What is the default configuration register setting on most Cisco routers?

A) 0x2012
B) 0x2104
C) 0x2142
D) 0x2102
E) 0x2210


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

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


4. What is ROM Monitor (ROMMON)?

A) a memory component for storing the saved configuration file
B) the source of the primary Cisco IOS software image
C) an operating system used for hardware troubleshooting and for password recovery
D) a memory management tool
E) temporary storage space for the router operating files


5. Which three statements are true about the operation of a full-duplex Ethernet network?
(Choose three.)

A) A dedicated switch port is required for each full-duplex node.
B) The host network card and the switch port must be capable of operating in full-duplex mode.
C) There are no collisions in full-duplex mode.
D) In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.
E) Ethernet hub ports are preconfigured for full-duplex mode.


Solutions:

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

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