CompTIA Exams Cross-forest Authentication
1. How many host bits would be required if your IPv4 network required 36 different hosts per subnet?
A. 3
B. 4
C. 5
D. 6
2. How many subnetworks would a Class C IPv4 address with a /27 subnet mask support, including the subnet-zero and all-ones subnets?
A. 2
B. 4
C. 8
D. 16
3. Which of the following tunneling technologies transforms a standard IPv4 address into 2002:AABB:CCDD:Subnet:InterfaceID format?
A. Teredo
B. ISATAP
C. VPN
D. 6to4
4. Which of the following IPv4 to IPv6 tunneling conventions carries a different name in Windows XP and Windows Server 2003?
A. 6to4
B. ISATAP
C. Teredo
D. VPN
5. Which of the following is an accurate shorthand notation of the IPv6 address FF02:0000: 0000:0001:0000:0000:0001:0032?
A. FF02::1:0:0:1:32
B. FF02::1::1:32
C. FF02::1::1::32
D. FF02:0:0:1::32
Answers to Review Questions
1. D. To support 36 hosts per subnet, you would need to CompTIA allocate 6 bits in your subnet mask. An easy way to do this is to start with the first bit, 0, and then hop to the second bit and multiply by intervals of 2 until you reach a number greater than your desired number (0, 2, 4. 8, 16, 32, 64). Since 64 is greater than 36 by a significant margin, you also allocate for the two addresses for broadcast and network addresses.
2. C. The number of subnetworks can be determined by taking the remaining number of bits in the subnet mask in addition to the default mask and raising to the power of that number. In this case, you have a default mask of 24 because it is Class C. Thus, three remain. If you raise 2 to the power of 3, it gives you the answer 8. Keep in mind, in practice, it’s best to account for the all-ones and subnet-zero subnet, leaving you with six practical and usable subnets.
3. D. Only 6to4 tunneling works by transforming an IPv4 address in a portion of the MCSA IPv6 address, prefaced by 2002 and concluded by Subnet:InterfaceID. Keep this in mind, because it makes it easy to identify when this type of tunneling is in use.
4. B. In Windows XP and Windows Server 2003, ISATAP tunneling is referred to as Auto- matic Tunneling Pseudo-Interface. This type of tunneling occurs by default in Windows XP, Windows Server 2003, and Windows Vista without Service Pack 1.
5. A. When using shorthand notation, you can use the :: symbol to indicate 0s until the first bit that contains a nonzero. Afterward, you must use the standard : separator.
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