Cisco 640-821 - Introduction to Cisco Networking Technologies

Cisco 640-821 Actual PDF
  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Updated: Jun 16, 2026
  • Q & A: 91 Questions and Answers
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Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. 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 forward the frame out port Fa0/3 only.
B) It will flood the frame out all ports.
C) It will drop the frame.
D) It will flood the frame out all ports except Fa0/3.


2. What data structure is described in the graphic?

A) Token Ring frame
B) TCP segment
C) Ethernet frame
D) IP datagram
E) UDP datagram
F) FDDI frame


3. 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 add the destination address of the frame to the MAC address table and forward the frame to host
B) The switch will flood the frame out of all ports except for port Fa0/3.
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.


4. How will a Cisco 2600 series router respond if the conditions listed below exist during the boot process?
1) The IOS image in flash is missing.
2) No network connectivity is available.
3) The router fallback IOS image is corrupt.

A) The router will enter global configuration mode.
B) The router will enter ROM monitor mode.
C) The boot will hang until an IOS is available.
D) The router will enter setup mode.
E) The router will enter the prompted setup dialog.


5. After the shutdown command has been issued on the serial 0/0 interface, what will be displayed when the show interface serial 0/0 command is issued by the administrator?

A) Serial0/0 is up, line protocol is up
B) Serial0/0 is down, line protocol is up
C) Serial0/0 is administratively down, line protocol is down
D) Serial0/0 is up, line protocol is down
E) Serial0/0 is down, line protocol is down
F) Serial0/0 is administratively down, line protocol is administratively down


Solutions:

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

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