思科认证考试（Cisco）CCNA考试七十九题(7)Cisco认证考试

文章作者 100test 发表时间 2009:04:30 00:38:16
来源 100Test.Com百考试题网

61. Which of the following about ARP is true? Choose 2

A. It is in the application layer
B. It is in the network layer
C. It maps mac addresses to ip addresses
D. It maps ip addresses to mac addresses

Answer B D. At the same layer are RARP, ICMP, and IP. RARP does what is in answer C.

62. What protocol in the transport layer does not guarantee packet delivery?

A. TCP B. IP C. IPX D. UDP

Answer D. It does a best effort delivery, but is faster than TCP.

63. Which of the following is a class A ip address?

A. 10.14.16.12 B. 127.0.0.1 C. 172.15.42.34 D. 209.123.32.212

Answer A.


64. Which of the following is a class B address?

A. 10.14.16.12 B. 127.0.0.1 C. 172.15.42.34 D. 209.123.32.212

Answer C.

65. Which of the following is a loop back address?

A. 10.14.16.12 B. 127.0.0.1 C. 172.15.42.34 D. 209.123.32.212

Answer B. This is used to test to see if IP is configured and working properly on
your pc,

66. Which of the following is a non routable ip address? Choose 2

A. 10.10.0.0 B. 192.168.0.1 C. 10.14.12.12 D. 209.32.242

Answer A B. These are good ip addresses to use behind a fire wall because they will
never be addresses that will be used on the internet.

67. Which of the following binary numbers represent 10.12.16.6

A. 00001010.00001100.00010000.00000110
B. 00011110.01010000.11001100.00110101
C. 01101010.11001010.01000101.01010011
D. 10001001.11010101.11111111.00000000

Answer A. D cannot be used at all because you can t have all 1 s or 0 s

68. What does the process of AND in do?

A. It determines the value of an ip address
B. It determines the port that TCP will use
C. It determines if two ip addresses are on the same network
D. It decides the ip address subnet

Answer C. You do this by writing out all the ip addresses in binary and match them
against their subnets. After you match up the 1 s and 0 s you can decide if they
are on the same network by seeing if all the numbers match. Check the test info
page for an example.

69. Which of the following is a class C address?

A. 124.12.13.44 B. 210.24.56.76
C. 127.0.0.1 D. 10.14.12.16

Answer B. An address above 191 for the first octet shows a class C address.