CISCO Certification problems
- 1. What is the Classs A Private IP address space? Discuss
Correct Answer: 10000 through 10255255255
- 2. What is the Class B private IP address space? Discuss
Correct Answer: 1721600 through 17231255255
- 3. What is the Class C private IP address space? Discuss
Correct Answer: 19216800 through 192168255255
- 4. Describe the functions of DNS and DHCP in the network? Discuss
Correct Answer: Dynamic Host Configuration protocol (DHCP) provides network configuration information (including IP address) to hosts, eliminating the need to perform the configurations manually Domain Name Service (DNS)resolves hostnames - both internet names such as wwwroutersimcom and device names such as workstation 2 to IP addresses, eliminating the need to know the IP address of a device for connection purposes
- 5. Which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?
Options- A. /28
- B. /29
- C. /30
- D. /31 Discuss
Correct Answer: /30
Explanation:
A point-to-point link uses only two hosts. A/30, or 255.255.255.252, mask provides two hosts per subnet.
- 6. What is the subnetwork address for a host with the IP address 200.10.5.68/28?
Options- A. 200.10.5.56
- B. 200.10.5.32
- C. 200.10.5.64
- D. 200.10.5.0 Discuss
Correct Answer: 200.10.5.64
Explanation:
This is a pretty simple question. A/28 is 255.255.255.240, which means that our block size is 16 in the fourth octent. 0,16, 32, 48, 64, 80, etc. The host is in the 64 subnet.
- 7. What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?
Options- A. 15
- B. 16
- C. 30
- D. 31 Discuss
Correct Answer: 30
Explanation:
A/27 (255.255.255.224) is 3 bits on and 5 bits off. This provides 8 subnets, each with 30 hosts. Does it matter if this mask is used with a Class A, B, or C network address? Not at all. The number of host bits would never change.
- 8. Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.25.224?
Options- A. Router(config)#ip classless
- B. Router(config)#ip version 6
- C. Router(config)#ip unnumbered
- D. Router(config)#ip subnet-zero Discuss
Correct Answer: Router(config)#ip subnet-zero
Explanation:
A Class C subnet mask of 255.255.255.224 is 3 bits on and 5 bits off (11100000) and provides 8 subnets, each with 30 hosts. However, if the command ip subnet-zero is not used, then only 6 subnets would be available for use.
- 9. To test the IP stack on your local host, which IP address would you ping?
Options- A. 127.0.0.0
- B. 1.0.0.127
- C. 127.0.0.1
- D. 127.0.0.255 Discuss
Correct Answer: 127.0.0.1
Explanation:
To test the localstack on your host, ping the loop back interface of 127.0.0.1
- 10. The network address used to advertise a summary address is always which of the following?
Options- A. The last network address in the block
- B. The next to last network in the block
- C. The second network in the block
- D. The first network in the block Discuss
Correct Answer: The first network in the block
Explanation:
The network address used to advertise a summary address is always the first network in the block
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