Cisco 640-821 Dumps : Introduction to Cisco Networking Technologies

640-821 real exams

Exam Code: 640-821

Exam Name: Introduction to Cisco Networking Technologies

Updated: May 27, 2026

Q & A: 91 Questions and Answers

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Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. A network administrator is connecting PC hosts A and B directly through their Ethernet interfaces as shown in the graphic. Ping attempts between the hosts are unsuccessful.
What can be done to provide connectivity between the hosts? (Choose two.)

A) A rollover cable should be used in place of the straight-through cable
B) A crossover cable should be used in place of the straight-through cable.
C) The subnet masks should be set to 255.255.255.0.
D) The subnet masks should be set to 255.255.255.192.
E) The hosts must be reconfigured to use private IP addresses for direct connections of this type.
F) A default gateway needs to be set on each host.


2. An administrator cannot connect from R1 to R2. To troubleshoot this problem, the administrator has entered the command shown in the exhibit. Based on the output shown, what could be the problem?

A) The serial interface has the wrong type of cable attached.
B) The serial interface does not have a cable attached.
C) The serial interface is configured for the wrong frame size.
D) The serial interface has a full buffer.
E) The serial interface is configured for half duplex.


3. A network administrator needs to create 29 subnetworks while maximizing the number of host addresses available on each subnet. How many bits must be borrowed from the host field of the network address to provide the required number of subnets with the most hosts per subnet?

A) 7
B) 5
C) 2
D) 4
E) 3
F) 6


4. A network associate needs to configure a router by connecting a remote computer to the router through the router auxiliary port. Which two statements describe the hardware required to make the connection to the router? (Choose two.)

A) The auxiliary port must be connected to a modem.
B) The technician needs an Ethernet transceiver.
C) The technician needs an RJ-45 to DB25 adapter.
D) The auxiliary port must be connected to an Ethernet LAN.


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


Solutions:

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

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