單項選擇題On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?()

A. Deleting unusable addresses through the creation of many subnets.
B. Combining routes to multiple networks into one supernet.
C. Reclaiming unused space by means of changing the subnet size.
D. Calculating the available host addresses in the AS.




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1.單項選擇題Which one of the following varieties of NAT utilizes different ports to map multiple IP addresses to a single globally registered IP address?()

A. Static NAT
B. Port loading
C. NAT Overloading
D. Dynamic NAT
E. None of the above

2.單項選擇題A TestKing PC has the IP address 172.16.209.10 /22. What is the subnet of this address?()

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


5.多項選擇題You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network?()

A. There are 254 usable subnets.
B. There are 256 usable hosts per subnet.
C. There are 50 usable subnets.
D. There are 254 usable hosts per subnet.
E. There are 24 usable hosts per subnet.
F. There is one usable network.

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