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"Introduction to Cisco Networking Technologies", the full name of  640-821 exam, is a Cisco certification.Preparing for the 640-821 exam? Looking for the best 640-821 Test Questions, 640-821 Practice Exam, 640-821 Dumps?

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1. Refer to the exhibit. Why was this message received?
 
A. No VTY password has been set.
B. No enable password has been set.
C. No console password has been set.
D. No enable secret password has been set.
E. The login command has not been set on CON 0.
F. The login command has not been set on the VTY ports.
Answer: A 
2.  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. 2
B. 3
C. 4
D. 5
E. 6
F. 7
Answer: D 
3. Refer to the exhibit. If host A sends an IP packet to host B, what will the OSI Layer 3 source address be
in the packet when it reaches host B? The safer , easier way to help you pass any IT exams.
3 / 9
 
A. 10.168.10.99
B. 10.168.11.88
C. 10.168.11.65
D. A1:A1:A1:A1:A1:A1
E. B2:B2:B2:B2:B2:B2
F. C3:C3:C3:C3:C3:C3
Answer: A 
4. What  is  the difference between  the Cisco router  IOS commands show cdp neighbor detail and show
cdp entry?
A. The show cdp neighbor detail command shows all neighbor information, while show cdp entry displays
only one line of output for each neighbor.
B. The show cdp entry command shows neighbor information for specific neighbors only, while show cdp
neighbor detail lists each neighbor with detailed output on each.
C. The show cdp entry command shows neighbor information for all neighbors with one line of output for
each, while show cdp neighbor detail lists each neighbor with detailed output on each.
D. The show cdp neighbor detail command shows neighbor information for a single neighbor only, while
show cdp entry displays detailed output on each neighbor known.
Answer: B 
5. Refer to the exhibit. A person is trying to send a file from a host on Network A of the JAX Company to a
server on Network Z of the XYZ Company. The file transfer fails. The host on Network A can communicate
with other hosts on Network A. Which command,  issued  from router RTA, would be  the most useful  for
troubleshooting this problem? The safer , easier way to help you pass any IT exams.
4 / 9
 
A. show flash:
B. show history
C. show version
D. show interfaces
E. show controllers serial
Answer: D 
6. Which Layer 4 protocol is used for a Telnet connection?
A. IP
B. TCP
C. UDP
D. ICMP
E. DNS
Answer: B 
7. What is the subnet address of 172.16.159.159/22?
A. 172.16.0.0
B. 172.16.128.0
C. 172.16.156.0
D. 172.16.159.0
E. 172.16.159.128
F. 172.16.192.0
Answer: C  The safer , easier way to help you pass any IT exams.
5 / 9
8. What is the purpose of flow control?
A. to ensure data is retransmitted if an acknowledgment is not received
B. to reassemble segments in the correct order at the destination device
C. to provide a means for the receiver to govern the amount of data sent by the sender
D. to regulate the size of each segment
Answer: C 
9. During the boot sequence, a 2600 series router needs to locate and load an operating system. What is
the default order the router uses to find an operating system?
A. Flash, TFTP server, ROM
B. Flash, TFTP server, RAM
C. Flash, NVRAM, TFTP server
D. ROM, TFTP server, Flash
E. Flash, ROM, TFTP server
Answer: A 
10. What is the subnet address for the IP address 172.19.20.23/28?
A. 172.19.20.0
B. 172.19.20.15
C. 172.19.20.16
D. 172.19.20.20
E. 172.19.20.32
Answer: C 
11. Which two statements describe the IP address 10.16.3.65/23? (Choose two.)
A. The subnet address is 10.16.3.0 255.255.254.0.
B. The lowest host address in the subnet is 10.16.2.1 255.255.254.0.
C. The last valid host address in the subnet is 10.16.2.254 255.255.254.0
D. The broadcast address of the subnet is 10.16.3.255 255.255.254.0.
E. The network is not subnetted. The safer , easier way to help you pass any IT exams.
6 / 9
Answer: BD 
12. An administrator issues the show ip interface s0/0 command and the output displays the line Serial0/0
is up, line protocol is upWhat does "line protocol is up" specifically indicate about the interface?
A. Keepalives are being received on the interface.
B. The cable is attached properly.
C. CDP has discovered the connected device.
D. A carrier detect signal has been received from the connected device.
E. IP is correctly configured on the interface.
Answer: A