單項選擇題Your network uses the172.12.0.0 class B address. You need to support 459 hosts per subnet, while accommodating the maximum number of subnets. Which mask wouldyou use?（）

A.255.255.0.0.
B.255.255.128.0.
C.255.255.224.0.
D.255.255.254.0.


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1.單項選擇題Which one of the binary bit patterns below denotes a Class B address?（）

A. 0xxxxxxx
B. 10xxxxxx
C. 110xxxxx
D. 1110xxxx
E. 11110xxx

2.單項選擇題What is the IP address range for the first octet in a class B address, in binary form?（）

A.00000111-10001111
B.00000011-10011111
C.10000000-10111111
D.11000000-11011111
E.11100000-11101111
F.None of the above

3.單項選擇題What is the subnet for the host IP address 201.100.5.68/28?（）

A.201.100.5.0
B.201.100.5.32
C.201.100.5.64
D.201.100.5.65
E.201.100.5.31
F.201.100.5.1

4.單項選擇題What is the subnet for the host IP address 172.16.210.0/22?（）

A. 172.16.42.0
B. 172.16.107.0
C. 172.16.208.0
D. 172.16.252.0
E. 172.16.254.0
F. None of the above


6.單項選擇題How many subnetworks and hosts are available per subnet if you apply a /28 mask to the 210.10.2.0 class C network?（）

A. 30 networks and 6 hosts.
B. 6 networks and 30 hosts.
C. 8 networks and 32 hosts.
D. 32 networks and 18 hosts.
E. 14 networks and 14 hosts.
F. None of the above

8.多項選擇題Which two of the addresses below are available for host addresses on the subnet 192.168.15.19/28?（）

A.192.168.15.17
B.192.168.15.14
C.192.168.15.29
D.192.168.15.16
E.192.168.15.31
F.None of the above

9.單項選擇題How do you express the binary number 10110011 in decimal form?（）

A.91
B.155
C.179
D.180
E.201
F.227

10.單項選擇題The MAC address for your PC NIC is: C9-3F-32-B4-DC-19. What is the address of the OUI portion of this NIC card, expressed as a binary number?（）

A.11001100-00111111-00011000
B.11000110-11000000-00011111
C.11001110-00011111-01100000
D.11001001-00111111-00110010
E.11001100-01111000-00011000
F.11111000-01100111-00011001

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