CCNA Exercise Lab 3

Write the subnet, broadcast address, and valid host range for the following:

1. 172.16.10.5 255.255.255.128

Subnet – 255.255.255.128/25
Broadcast – 172.16.10.127
Valid host - 172.16.10.1 to 172.16.10.126

2. 172.16.10.33 255.255.255.224

Subnet – 255.255.255.224/27
Broadcast –172.16.10.64
Valid host - 172.16.10.33 to 172.16.10.63

3. 172.16.10.65 255.255.255.192

Subnet - 255.255.255.192/26
Broadcast –172.16.10.127
Valid host - 172.16.10.65 to 172.16.10.126

4. 172.16.10.17 255.255.255.252

Subnet – 255.255.255.252/30
Broadcast –172.16.10.18
Valid host - 172.16.10.17

5. 172.16.10.33 255.255.255.240

Subnet – 255.255.255.240/28
Broadcast –172.16.10.41
Valid host - 172.16.10.28 to 172.16.10.40

6. 192.168.100.25 255.255.255.252

Subnet – 255.255.255.252/30
Broadcast –192.168.100.26
Valid host - 192.168.100.25

7. 192.168.100.17, with 4 bits of subnetting

Subnet – 255.255.255.240/28
Broadcast – 192.168.100.27
Valid Host – 192.168.100.15 to 192.168.100.26

8. 192.168.100.66 with 3 bits of subnetting

Subnet – 255.255.255.224/27
Broadcast – 192.168.100.95
Valid Host – 192.168.100.65 to 192.168.100.94

9. 192.168.100.17 255.255.255.248

Subnet – 255.255.255.248/29
Broadcast – 192.168.100.23
Valid Host – 192.168.100.17 to 192.168.100.22

10. 10.10.10.5 255.255.255.252

Subnet – 255.255.255.252/30
Broadcast – 10.10.10.6
Valid Host – 10.10.10.5

Review Questions

1. Which protocol working at the Transport layer provides a connectionless service between hosts?

  1. IP
  2. ARP
  3. TCP
  4. UDP
  5. Ans- D

2. Which protocol works at the Transport layer and provides virtual circuits between hosts?

  1. IP
  2. ARP
  3. TCP
  4. UDP
  5. Ans- C

3. Which protocol works at the Internet layer and provides a connection service between hosts?

  1. IP
  2. ARP
  3. TCP
  4. UDP
  5. Ans- A

4. If a host broadcasts a frame that includes a source and destination hardware address, and its purpose is to assign IP addresses to itself, which protocol at the Network layer does the host use?

  1. RARP
  2. ARPA
  3. ICMP
  4. TCP
  5. IPX
  6. Ans- B

5. If a router interface is congested, which protocol in the IP suite is used to tell neighbor routers?

  1. RARP
  2. ARP
  3. ICMP
  4. IP
  5. TCP
  6. Ans- C

6. What is the valid host range the IP address 172.16.10.22 255.255.255.240 is a part of?

  1. 172.16.10.20 through 172.16.10.22
  2. 172.16.10.1 through 172.16.10.255
  3. 172.16.10.16 through 172.16.10.23
  4. 172.16.10.17 through 172.16.10.31
  5. 172.16.10.17 through 172.16.10.30
  6. Ans- E

7. What range of addresses can be used in the first octet of a Class B network address?

  1. 1–126
  2. 1–127
  3. 128–190
  4. 128–191
  5. 129–192
  6. 192–220
  7. Ans- D

8. What range of addresses can be used in the first octet of a Class C address?

  1. 1–127
  2. 129–192
  3. 203–234
  4. 192–223
  5. Ans- D

9. How many bytes is an Ethernet address?

  1. 3
  2. 4
  3. 5
  4. 6
  5. 7
  6. 8
  7. 16
  8. Ans- D

10. What protocol is used to find the hardware address of a local device?

  1. RARP
  2. ARP
  3. IP
  4. ICMP
  5. BootP
  6. Ans- B

11. Which of the following is the broadcast address for a Class B network ID using the default subnet mask?

  1. 172.16.10.255
  2. 172.16.255.255
  3. 172.255.255.255
  4. 255.255.255.255
  5. Ans- B

12. Which class of IP address provides a maximum of only 254 host addresses per network ID?

  1. A
  2. B
  3. C
  4. D
  5. E
  6. Ans- C

13. What is the broadcast address of the subnet address 10.254.255.19 255.255.255.248?

  1. 10.254.255.23
  2. 10.254.255.24
  3. 10.254.255.255
  4. 10.255.255.255
  5. Ans- A

14. What is the broadcast address of the subnet address 172.16.99.99 255.255.192.0?

  1. 172.16.99.255
  2. 172.16.127.255
  3. 172.16.255.255
  4. 172.16.64.127
  5. Ans- A

15. If you wanted to have 12 subnets with a Class C network ID, which subnet mask would you use?

  1. 255.255.255.252
  2. 255.255.255.248
  3. 255.255.255.240
  4. 255.255.255.255
  5. Ans- C

16. What is the port number range that a transmitting host can use to set up a session with another host?

  1. 1–1023
  2. 1024 and above
  3. 1–256
  4. 1–65534
  5. Ans- B

17. Which of the following ranges are considered well-known port numbers?

  1. 1–1023
  2. 1024 and above
  3. 1–256
  4. 1–65534
  5. Ans- A

18. What is the broadcast address of the host subnet address 10.10.10.10 255.255.254.0?

  1. 10.10.10.255
  2. 10.10.11.255
  3. 10.10.255.255
  4. 10.255.255.255
  5. Ans- B

19. What broadcast address will the host 192.168.210.5 255.255.255.252 use?

  1. 192.168.210.255
  2. 192.168.210.254
  3. 192.168.210.7
  4. 192.168.210.15
  5. Ans- C

20. If you need to have a Class B network address subnetted into exactly 510 subnets, what subnet mask would you assign?

  1. 255.255.255.252
  2. 255.255.255.128
  3. 255.255.0.0
  4. 255.255.255.192
  5. Ans- B

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