CCNA认证考试最新真题

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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