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Download Cisco : 640-821 Questions & Answers as PDF & Test Software

Last Updated: Jun 01, 2026

No. of Questions: 91 Questions & Answers with Testing Engine

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Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. A network administrator cannot get a router serial interface to become active. The administrator suspects that the problem may be the cable attached to the interface. The administrator is not at the same physical location as the router. Which Cisco IOS command allows the administrator to check the serial 0/0 cabling type?

A) show startup-config
B) show version
C) show controllers serial 0/0
D) show interfaces serial 0/0
E) show running-config


2. Refer to the exhibit. HostB is sending a file to HostA. B represents the frame as it leaves the Oshawa router. What is the Layer 2 destination address of the frame at this point?

A) abcd.2246.0035
B) abcd.1123.0045
C) abcd.4444.0012
D) abcd.1234.5678
E) aabb.5555.2222


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


4. Refer to the exhibit. A network technician is troubleshooting a connectivity problem between two routers. The technician has established a console session with RouterA, checked the interface status, and verified that the IP address is correct. However, the technician is unable to telnet to RouterB, which is located offsite, to troubleshoot the problem. Which command can the technician issue on RouterA to verify the IP address of the RouterB serial interface?

A) show cdp neighbors detail
B) show cdp neighbors
C) show controllers serial
D) show arp
E) show interfaces serial 0/1


5. A router receives a packet on interface 172.16.45.66/26. The source IP of the packet is
172.16.45.126/26 and the destination is 172.16.46.191/26. How will the router handle the packet?

A) The destination is a network address, so the router will forward the packet.
B) The destination is a broadcast address, so the router will not forward the packet.
C) The destination is a host on the same subnet, so the router will forward the packet.
D) The destination is a host on another subnet, so the router will not forward the packet.


Solutions:

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

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