Cisco Introduction to Cisco Networking Technologies : 640-821

640-821 testking pdf

Exam Code: 640-821

Exam Name: Introduction to Cisco Networking Technologies

Updated: May 26, 2026

Q & A: 91 Questions and Answers

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About Cisco Introduction to Cisco Networking Technologies : 640-821 Exam

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640-821 exam dumps

Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs?

A) 172.16.45.16
B) 172.16.45.4
C) 172.16.45.0
D) 172.16.45.12
E) 172.16.45.8


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


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

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


4. An elementary school has a computer in every classroom. One entire wing of the school connects to a centrally located hub. The teachers have reported a slowdown in the past few weeks to the network administrator. The network administrator has analyzed the network and documented a steep increase in utilization as the teachers use a new network- based classroom management application. Which solution will improve the performance the most?

A) Ensure all devices in the affected wing have a default gateway.
B) Reboot the router that connects to the hub.
C) Install a router and install another hub in the affected wing.
D) Replace the hub with a switch.
E) Install a repeater in the affected wing.


5. Which command displays the status of the network layer protocols active on a router?

A) show flash
B) show network protocols
C) show stacks
D) show version
E) show protocols


Solutions:

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

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