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Incorrect Answers:
A is incorrect; this is the IP that would be used to send a broadcasts to all host of the 172.20.7 subnet. B is incorrect; with the facts of this question this is not a valid IP.
D is incorrect; this is the IP address used to send a message to all hosts on the 172.20 network.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
Q. 174
What is the bit length and expression form of a MAC address?
A.24 bits expression as a decimal number
B.24 bits expression as a hexadecimal number
C.36 bits expression as a binary number
D.48 bits expression as a decimal number
E.48 bits expression as a hexadecimal number
Answer: E
Explanation:
The MAC address is a 48 bit address expressed as 12 hexadecimal digits. The first 24 bits or 6 hexadecimal digits of the MAC address contain a manufactures identification or vendor code (also known as the Organizatinally Unique Indentifier – OUI). To ensure uniqueness, the IEEE administers OUIs. The last 24 bits or 6 hexadecimal digits are administered by each vendor and often represent the interface serial number.
Incorrect Answers:
A, B, and C are incorrect; MAC addresses are 48 bits that are expressed as a hexadecimal number. D is incorrect; MAC addresses are expressed as hexadecimal, not decimal.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
Q. 175
Which command displays all the commands in the history buffer?
A.control header
B.show buffer
C.show history
D.show history buffer
Answer: C
Explanation: The show history command will show of the commands that are stored in the buffer.
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