CCNA真题(1)TCP/IP：地址和协议

 
26: You are given an IP network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. This will help alleviate congestion on the network. What subnet mask can you use to create the subnets necessary to meet the given criteria?

A. 255.0.0.0

B. 255.255.0.0

C. 255.255.255.0

D. 255.255.255.224

E. 255.255.255.240
 
27: Which of the following would a Class A network be assigned to?

A. Government agency

B. Small-to-medium sized corporation

C. SOHO

D. An individual
 
28: A client has the IP address 192.168.5.98/27. Which of the following addresses are on the same subnet as this host? (Choose two.)

A. 192.168.5.95

B. 192.168.5.100

C. 192.168.5.128

D. 192.168.5.110
 
29: Which of the following IP addresses is not a public IP address that can be routed over the Internet?

A. 2.3.4.5

B. 11.12.13.14

C. 165.23.224.2

D. 172.31.45.34

E. 203.33.45.22
 
30: You are given a Class B network. What is the default subnet mask assigned to the Class B network?

A. 255.255.255.255

B. 255.255.0.0

C. 255.224.0.0

D. 0.0.0.0
 
31: You are troubleshooting your router's interfaces. For some reason, the Ethernet interface will not accept the IP address of 192.168.5.95/27 that you've assigned. Which of the following explains the router's refusal to take the IP address?

A. Class C addresses cannot be assigned to Ethernet interfaces.

B. The /27 is an invalid mask.

C. It is a broadcast address.

D. It is a public IP address.

E. It is a private IP address.
 
32: You are a network technician at Acme, Inc. You are required to divide the 172.12.0.0 network into subnets. Each subnet must have the capacity of 458 IP addresses. Also, according to the requirements, you must provide the maximum number of subnets. Which subnet mask should you use?

A. 255.255.255.254

B. 255.255.254.0

C. 255.255.240.254

D. 255.255.0.0
 
33: What is the subnetwork and broadcast IP address of 192.168.2.37 with the subnet mask of 255.255.255.248?

A. 192.168.2.24/192.168.2.31

B. 192.168.2.32/192.168.2.39

C. 192.168.2.40/192.168.2.47

D. 192.168.2.48/192.168.2.55

E. 192.168.2.56/192.168.2.63
 
34: One of your co-workers at Acme, Inc., needs to convert the binary number 11011010 into a decimal. What is the decimal equivalent?

A. 218

B. 219

C. 220

D. 221

E. 222
 
35: One of your co-workers at Acme, Inc., needs to convert the binary number 01011010 into a decimal. What is the decimal equivalent?

A. 75

B. 83

C. 90

D. 97
 
36: One of your co-workers at Acme, Inc., needs to convert the binary number 11010110 into a decimal. What is the decimal equivalent?

A. 198

B. 214

C. 252

D. 255
 
37: One of your co-workers at Acme, Inc., needs to convert the binary number 10110110 into a decimal. What is the decimal equivalent?

A. 182

B. 192

C. 202

D. 212
 
38: You are configuring a subnet for the Acme, Inc., branch office in Beijing. You need to assign IP addresses to hosts in this subnet. You have been given the subnet mask of 255.255.255.224. Which of these IP addresses would be valid? (Choose three.)

A. 15.234.118.63

B. 92.11.178.93

C. 134.178.18.56

D. 192.168.16.87

E. 201.45.116.159

F. 217.63.12.192
 
39: You are a network technician at Acme, Inc. You have subnetted the 208.98.112.0 network with a /28 mask. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router is using ip subnet-zero?

A. 62 networks and 2 hosts

B. 6 networks and 30 hosts

C. 8 networks and 32 hosts

D. 16 networks and 16 hosts

E. 16 networks and 14 hosts

40: What is a disadvantage of using a connection-oriented protocol such as TCP?

A. Packet acknowledgment might add overhead.

B. Packets are not tagged with sequence numbers.

C. Loss or duplication of data packets is more likely to occur.

D. The application layer must assume responsibility for the correct sequencing of the data packets.
 
41: You are a network technician at Acme, Inc. You have subnetted the 192.168.72.0 network with a /30 mask for connections between your routers. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router cannot use ip subnet-zero?

A. 62 networks and 2 hosts

B. 6 networks and 30 hosts

C. 8 networks and 32 hosts

D. 16 networks and 16 hosts

E. 14 networks and 14 hosts
 
42: Which of the following IP addresses are considered "network" addresses with a /26 prefix? (Choose two.)

A. 165.203.2.0

B. 165.203.5.192

C. 165.203.6.63

D. 165.203.6.191

E. 165.203.8.255
 
43: Identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (Choose three.)

A. 192.168.32.33

B. 192.168.32.112

C. 192.168.32.119

D. 192.168.32.126

E. 192.168.32.175

F. 192.168.32.208
 
44: A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?

A. 198.57.78.33

B. 198.57.78.64

C. 198.57.78.97

D. 198.57.78.97

E. 198.57.78.159

F. 198.57.78.254
 
45: What is the subnetwork address for a host with IP address 165.100.5.68/28?

A. 165.100.5.0

B. 165.100.5.32

C. 165.100.5.64

D. 165.100.5.65

E. 165.100.5.31

F. 165.100.5.1
 
46: Your boss wants to know what TCP stands for. What do you tell him?

A. Transmission Check Protocol

B. Transport Check Protocol

C. Transmission Control Protocol

D. Transport Control Protocol
 
47: Your boss wants to know what UDP stands for. What do you tell him?

A. Unreliable Data Protocol

B. Unreliable Data Program

C. User-Defined Protocol

D. User Datagram Protocol
 
48: Which of the following statements accurately describes UDP?

A. UDP copies files between a computer and a system running rshd, the remote shell service (daemon).

B. UDP is a member of the TCP/IP suite of protocols that governs the exchange of electronic mail between message transfer agents.

C. UDP is a member of the TCP/IP suite of protocols and is used to copy files between two computers on the Internet. Both computers must support their respective roles: one must be a client, and the other a server.

D. UDP is a TCP complement that offers a connectionless datagram service guaranteeing neither delivery nor correct sequencing of delivered packets (much like IP).
 
49: Which of the following host addresses are members of networks that can be routed across the public Internet? (Choose three.)

A. 10.20.12.64

B. 172.16.32.129

C. 172.64.32.34

D. 192.168.23.252

E. 196.104.12.95

F. 214.192.48.254
 
50: You are connecting your Serial 0/1 interface to the Internet. Which of the following need to be done for the connection to work? (Choose two.)

A. Assign a public IP address.

B. Use the shutdown command.

C. Use the no shutdown command.

D. Make sure the interface is running in full-duplex.

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