Prepare with Cisco 640-821 exam practice material, pass for sure
Updated: Jun 02, 2026
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Cisco Introduction to Cisco Networking Technologies Sample Questions:
1. The Hub and Spoke routers are directly connected through their serial interfaces for purposes of testing. Based on the output shown in the exhibit, what must be done to make the serial line operational?
A) Use the no shutdown command on the Hub router.
B) Replace the broken cable between the two devices.
C) Start the clock on the Hub router.
D) Change the IP address on the Spoke router.
E) Configure the serial 0/0 interface on the Spoke router with a clockrate.
2. Which statements accurately describe CDP? (Choose three.)
A) CDP can discover Cisco devices that are not directly connected.
B) CDP is a Cisco proprietary protocol.
C) CDP is a datalink layer protocol.
D) CDP is an IEEE standard protocol.
E) CDP can discover directly connected neighboring Cisco devices.
F) CDP is a network layer protocol.
3. When files are transferred between a host and an FTP server, the data is divided into smaller pieces for transmission. As these pieces arrive at the destination host, they must be reassembled to reconstruct the original file. What provides for the reassembly of these pieces into the correct order?
A) the frame check sequence in the Ethernet frame trailer
B) the acknowledgement number in the segment header
C) the Start Frame Delimiter in the 802.3 Preamble
D) the sequence number in the TCP header
E) the TTL in the IP header
4. WAN data link encapsulation types include which of the following? (Choose two.)
A) ISDN
B) PPP
C) T1
D) DSL
E) Frame Relay
5. What is the subnet address of 172.16.159.159/22?
A) 172.16.0.0
B) 172.16.159.0
C) 172.16.128.0
D) 172.16.159.128
E) 172.16.156.0
F) 172.16.192.0
Solutions:
| Question # 1 Answer: E | Question # 2 Answer: B,C,E | Question # 3 Answer: D | Question # 4 Answer: B,E | Question # 5 Answer: E |
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