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C is incorrect;
D is incorrect; ICMP, which is used for the ping command, does not validate routes.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
Q. 208
Calculate the number of usable networks and usable hosts for the network 210.106.14.0/24.
A.1 network with 254 hosts
B.2 networks with 128 hosts
C.4 networks with 64 hosts
D.6 networks with 30 hosts
Answer: A
Explanation: As the last octet is for host addresses, the maximum number networks is 1 to determine the number of host use the formula (2^8) – 2. That is
Incorrect Answers:
B and C are incorrect; these combination of networks and hosts is not possible.
D is incorrect; this would require a subnet mask of 255.255.255.224.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) page 236.
Wendell Odom. Cisco CCNA Exam
Q. 209
In which two modes can the ICMP ping command be used? (Choose two)
A.User
B.Privileged
C.Global Configuration
D.Interface Configuration
Answer: A, B
Explanation: The ping command is used to check network and host reachability. The ping command can be used at both the privileged exec mode and the user exec mode.
Incorrect Answers:
C is incorrect; the global configuration mode can be used to configure global parameters of the device. The ping command cannot be used in this mode.
D is incorrect; the interface configuration mode is used to configure a specific interface. The ping command cannot be used in this mode.
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